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11-13-2017, 03:15 PM
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#1376
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by MDSheds_SS
If you upgraded the MAF from 78 to 85 doesn't it need to be tuned for that?
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Yeah, but we did that
Quote:
Originally Posted by sweetbmxrider
I would throw kirk's old tune at it if he has it still.
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He does, i will ask him to send me the magic file.
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-13-2017, 03:22 PM
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#1377
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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How could you tune for the new MAF size if you can't get it to run properly?
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11-13-2017, 04:25 PM
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#1378
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by PolarBear
How could you tune for the new MAF size if you can't get it to run properly?
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Not tuned, calibrated rather.
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-14-2017, 07:50 AM
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#1379
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Quote:
Originally Posted by LS1ow
Not tuned, calibrated rather.
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Same thing, how could you do it without the engine running?
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11-14-2017, 09:20 AM
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#1380
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Maybe try disconnecting the MAF as long as your IAT isn't in it
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11-14-2017, 10:29 AM
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#1381
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13 Second Club / Moderator
Join Date: Jan 2005
Location: Franklin Lakes, NJ
Posts: 8,688
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Quote:
Originally Posted by LS1ow
Not tuned, calibrated rather.
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Try uncalibrating it and I'll bring my MAF over after work one of these days.
__________________
Quote:
Originally Posted by LS1ow
Except Jersey mike, great kid, but the way he looks at me makes me feel like im in danger
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11-14-2017, 11:13 AM
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#1382
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by PolarBear
Maybe try disconnecting the MAF as long as your IAT isn't in it
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It is, the maf is a 5 pin so the IAT is built in to it. I did unplug the MAF and give it a go, but that would mean unplugged IAT as well.
I can toss this thing back together and try it with the MAF unplugged but IAT plug plugged into the IAT thats in the lid.
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-14-2017, 12:39 PM
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#1383
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Just to rule out the 85mm MAF I would revert back to original MAF and IAT and give that a shot. Also relearn the TSP if you haven't done that already. I ran my car on stock 78mm MAF and IAT plugged in the lid with my PRC heads and Cam on original start up before converting to LS3 card style. Ran a little lean but it was good enough for startup.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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11-14-2017, 03:18 PM
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#1384
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by MDSheds_SS
Just to rule out the 85mm MAF I would revert back to original MAF and IAT and give that a shot. Also relearn the TSP if you haven't done that already. I ran my car on stock 78mm MAF and IAT plugged in the lid with my PRC heads and Cam on original start up before converting to LS3 card style. Ran a little lean but it was good enough for startup.
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Im gunna grab a stock maf from Mike, and im picking up a IAT sensor from chevy tmmr (one in the lid has been knocked around and painted over lol)
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-15-2017, 06:57 AM
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#1385
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Really hung up on if the low compression numbers are related to the firing issue, or if thats a completely separate issue Ive just bought to light. Maybe there coming up so low bc the engine has only ran for 10 seconds in the past 6 or so months. Who knows.
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-15-2017, 07:14 AM
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#1386
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Power Member/NJFBOA Bookie/Moderator
Join Date: Jun 2009
Location: North Jersey = Best Jersey.
Posts: 4,435
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Quote:
Originally Posted by LS1ow
Finally was able to get a pushrod checker. Started short and adjusted to till there was no rock in the rocker.
Like a doofus, measured with a ruler and sat 7.250.
Then after Kirk hit me with a
I took out the mic and it was really 7.312. Leaving my options at 7.375 for .062 preload, or 7.400 with .088 preload.
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Quote:
Originally Posted by LS1ow
So heres the results.
Using a SnapOn compression tester, cranked the motor for 4 "jumps" of the gauge as per instructions. Fuel pump off and coil packs unplugged, so no fuel or spark. Cold engine obviously.
1- 95
3- 98
5-100
7-98
2-87
4-85
6-90
8-98
yeahhhh lmao
Im thinking is possible the pushrods i have are too long. I have 7.4" in the car now, i know i measured out a little bit shorter than 7.4", but i do remember what it was off the top of my head/why i ended up going w. 7.4"
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Quote:
Originally Posted by LS1ow
Im gunna grab a stock maf from Mike, and im picking up a IAT sensor from chevy tmmr (one in the lid has been knocked around and painted over lol)
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Uh, good to know I guess Obviously, you're welcome to it. You can take my SLP lid with IAT sensor too. Also, if you're feeling frisky there's a truck MAF & breakout harness installed on the car that you can borrow as well. You should know the garage code, but if not, text me. Just to rule out valves, grab my assembled 243s and springs off the shelf too, because at this point, it'll only cost you a Friday night & a set of head gaskets--fuggit.
Question for the pros: There's a correlation between MAF and those low compression numbers??
Beggers, jog my memory: - You pulled the valve covers and verified rockers are going choo-choo?
- You double checked that you didn't butcher anything during your snipping-spree or the re-looming of the harness?
- Did you move coil packs around? You can grab LS1 coil packs & plug wires for testing/Racewars purposes as well.
- Swapping to stock injectors helped, correct? How did you ascertain that there were no fueling issues in the system you plumbed?
4 days. Buckle in for some long nights.
__________________
1995 Firebird... Stock-ish.
Quote:
Originally Posted by LS1ow
Good. He microwaved my phone 6 years ago, i hope his intake erupts.
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Last edited by Jersey Mike; 11-15-2017 at 09:34 AM.
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11-15-2017, 08:24 AM
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#1387
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,638
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At this point, the easiest test to run would be:
Rocker bolts snug down, then back off two turns. Run compression test. If the numbers jump up significantly, points to too-long pushrods.
The low compression test numbers are clue we shouldn't ignore. Also, crank the motor until the gauge stops climbing, that'll give the lifters a chance to pump up with a little oil.
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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11-15-2017, 10:39 AM
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#1388
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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I agree. I just wonder if the gauge is bad or slow cranking speed since they were all low. After kirk told me how you measured for pushrods, I would do like the bishop says and see if the numbers improve.
Quote:
Originally Posted by Jersey Mike
Question for the pros: There's a correlation between MAF and those low compression numbers??
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Nothing at all
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11-15-2017, 11:34 AM
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#1389
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by Jersey Mike
Question for the pros: There's a correlation between MAF and those low compression numbers??
Beggers, jog my memory: - You pulled the valve covers and verified rockers are going choo-choo?
- You double checked that you didn't butcher anything during your snipping-spree or the re-looming of the harness?
- Did you move coil packs around? You can grab LS1 coil packs & plug wires for testing/Racewars purposes as well.
- Swapping to stock injectors helped, correct? How did you ascertain that there were no fueling issues in the system you plumbed?
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No Relation between MAF and compression, like we were talking in text, im starting to think low compression doesnt have to do with the firing issues.
Quote:
Originally Posted by The_Bishop
Rocker bolts snug down, then back off two turns. Run compression test. If the numbers jump up significantly, points to too-long pushrods.
The low compression test numbers are clue we shouldn't ignore. Also, crank the motor until the gauge stops climbing, that'll give the lifters a chance to pump up with a little oil.
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I had the rockers down snug with the pushords in for the leakdown and nothing got by the valves, it all came past the rings. You can clearly hear the air coming out of the crankcase(still had timing cover off) No hissing out of exhaust or top end. Wouldnt this verify pushrods are not holding valves open?
Quote:
Originally Posted by sweetbmxrider
I agree. I just wonder if the gauge is bad or slow cranking speed since they were all low. After kirk told me how you measured for pushrods, I would do like the bishop says and see if the numbers improve.
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I can grab the gauge from work and try it with that one. Mine is SnapOn, not sure of the work brand. Its audi supplied.
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-15-2017, 01:00 PM
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#1390
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Low compression will definitely give you firing issues. Snapon should be good. Wanna buy my car?
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11-15-2017, 01:56 PM
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#1391
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by sweetbmxrider
Low compression will definitely give you firing issues. Snapon should be good. Wanna buy my car?
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no way lmao this is my last fbody hurrah
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-15-2017, 02:03 PM
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#1392
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,151
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Quote:
Originally Posted by LS1ow
no way lmao this is my last fbody hurrah
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don't blame the car for the loose nut in the toolbox.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
Last edited by BonzoHansen; 11-15-2017 at 02:03 PM.
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11-15-2017, 03:24 PM
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#1393
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by BonzoHansen
don't blame the car for the loose nut in the toolbox.
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Haha what i mean is Id like to graduate to a C5 or C6
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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11-15-2017, 03:45 PM
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#1394
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10 Second Club
Join Date: Feb 2008
Location: Eatontown
Posts: 1,647
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Quote:
Originally Posted by LS1ow
Haha what i mean is Id like to graduate to a C5 or C6
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Just give me a call when you're ready for that diploma
__________________
1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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11-15-2017, 06:47 PM
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#1395
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,638
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Quote:
Originally Posted by LS1ow
I had the rockers down snug with the pushords in for the leakdown and nothing got by the valves, it all came past the rings. You can clearly hear the air coming out of the crankcase(still had timing cover off) No hissing out of exhaust or top end. Wouldnt this verify pushrods are not holding valves open?
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No, not really because when the lifters sit, they bleed down which will let the valves close. If you crank it with all the plugs out, it should turn over pretty quick, which will build oil pressure, which will get the lifters to do what they'd be doing when running. If the pushrods are slightly too long in a hydraulic lifter setup, it'll show in a compression test but not necessarily in a leakdown test.
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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11-15-2017, 07:03 PM
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#1396
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,638
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__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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11-15-2017, 08:35 PM
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#1397
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,151
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Quote:
Originally Posted by LS1ow
Haha what i mean is Id like to graduate to a C5 or C6
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At this rate i think graduation is less likely than being left back.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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11-16-2017, 06:08 AM
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#1398
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,638
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If the pushrods are too long and hanging the valves open while the engine's trying to run, it'll bleed off cylinder pressure which will make it run like ca-ca, and the back pressure will force a combustible amount of fuel/air into the intake, which will occasionally ignite when some burning gasses leak into it, hence the backfires.
That's my theory, anyway.
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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11-16-2017, 10:31 AM
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#1399
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Quote:
Originally Posted by LS1ow
no way lmao this is my last fbody hurrah
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Ok ok......I'll sell you my 10 second lt1. Had compression last time I used it
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11-17-2017, 10:02 AM
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#1400
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Knock Knock...
whos there?
Endless pit.
Untitled by mickey beggs, on Flickr
Untitled by mickey beggs, on Flickr
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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