Stuck in the 14's

[94lt4373]

My first post and I need help guys. I have a 94 camaro with LT4 conversion,58mm TB, full exhaust, CAI, 1800 stall, 275 40 17 MT street radials, 373's, lt1 edit and cosmetics and I cant break 13.9. I've run 7 times from 13.9 my first run (2.73 gears no slicks) to 14.4 - Here's my slip from sunday at island

R/T... .241
60'...2.112
330...5.991
1/8...9.140
MPH...78.26
1000...11.875
1/4...14.170
MPH...98.65

Right now i'm shifting at 6300 rpm(lt1edit), do you think I can go higher with stock bottom end?
I don't spin of the line-
Past the middle of 3rd gear in 1/4
My buds say my car just doesn't have the horses (need like 50 more)to pull my set up and a 2800 stall will help
Any input would be great, thanks guys

[Mike]

why such a small stall? i would think it could stall 1800 stock?

[94lt4373]

Well the stall I got was rated at 1800 a little higher than stock. I rebuilt the trans 2 years ago, and started running the car in july

[Tru2Chevy]

The car isn't leaving well at all. With your mods, plus those tires, you should be able to get 1.8/1.9 60' times pretty easily. What's your rear suspension setup?

I would also look into the tune....that's a pretty slow MPH for the mods that you have listed.

- Justin

[Squirrel]

you need to find out whats wrong with your car before you start throwing parts at it

[94lt4373]

Yea aftermarket converter, stock suspension, I show high 800's low 900's on the o2's when i run - my fastest 60' was 2.056 with street tires and 2.73 rear (99.2MPH)- I don't know what the problem is?

[Tru2Chevy]

Yea aftermarket converter, stock suspension, I show high 800's low 900's on the o2's when i run - my fastest 60' was 2.056 with street tires and 2.73 rear (99.2MPH)- I don't know what the problem is?

Well, that suspension certainly isn't helping. Neither is that converter. Might as well be stock. Either way, I think you should be trapping higher than you are....

- Justin

[94lt4373]

Squirrel, I didn't think anything was wrong with the car so i changed 2.73's to 3.73's and put the MT's on

[94lt4373]

yea, I thought after the gears and slicks i could pull a low 13 or high 12 instead a 14.1

[Squirrel]

high 13's is bone stock territory...the major question i have to ask is, did you get it tuned after the heads and cam?

[94lt4373]

I have lt1 edit and tune it myself

[Tru2Chevy]

Not trying to offend you or anything, but are you confident in your tuning abilities? If you don't have a good amount of experience, you might want to talk to some others about your setup and your tune to make sure everything is one the right track.

- Justin

[94lt4373]

I hear you man, my readings are are straight and I have faith in my tune, if anybody wants to read my logs that would be great but my o2's show high 800's to low 900's on my logs. Thanks for responding

[Squirrel]

I hear you man, my readings are are straight and I have faith in my tune, if anybody wants to read my logs that would be great but my o2's show high 800's to low 900's on my logs. Thanks for responding

so youre tuning it completely by narrowband?

[94lt4373]

yea just with lt1edit and logging runs - u think I need a better tune?

[90FormulaWS6]

yea just with lt1edit and logging runs - u think I need a better tune?

yep... and i think you should look into wideband oxygen sensors if you plan on having any type of accurate tune

EDIT: what are you using to datalog?

RE-EDIT: i cant believe im getting back into this... what am i thinking [/hijack]

[94lt4373]

ok, so just tell me my tune is the problem and where can i go to fix it? central NJ?

[Bow94z]

ur 1/8mile is terrible, My car on Sunday was doin 8.6@82.13mph in the 1/8.
Check ur basics like plugs/wires, How old is the opti?

[94lt4373]

opti is like 3 years old-plugs/wires the same

[94lt4373]

but why is my 1/8 so bad, car runs like rocket on the street?
Killed a new gt0 at a light with me 270 lbs. and my dad 300lbs at a light on the way to island sunday?

[Pampered-Z]

330s and 1/8 are on par for a low 14 second pass. It was a hot day and you were on a prep'd track, your not going to spin and in fact, you have to overcome all the VHT that is sticking your car to track and that takes HP, so your car could be slower on the track. When you ran before on street tires you probably were spinning. Your 60' were probably down even though your ET was quicker because when you spin you somewhat get a running start. Sticky tires on a sticky track use HP.

You say you have an LT4 conversion, is that the cam or the entire head/cam package? What do you mean by full exhaust? All stock?

I see a few things I'd change: As already stated, your convertor and gear combo is hurting you. Along with what everyone else said I would try dropping down to a 52MM TB. 58 is probably too large for your set-up. I lost .2 when I went from 52 to a 58 TB on a motor with shorty headers, lingenfelter cam and stage II heads. Switched back to the 52MM and the car picked right back up. If your still running the stock exhaust manifolds then thatis holding the motor back allot as well!

I would put the car on a dyno and see where you're peaking, and also look at your data log for things like timing and injector pulse. Could be that your're getting false knock and as a result allot of timing is getting pulled out??

Properly tuned a LT4 should go 315 - 320 RWHP. But that is a small cam for racing. It makes good torque below 5,000 but runs out in the upper RPMs. You may just be spinning too far past the HP peak on the shifts?

[GP99GT]

i wouldnt go any higher on the shift points, thats not your problem...somethings up with your tuning i'd say. low 14's is what a stock auto z28 will run with a decent driver...you should be well into the mid-low 13s with your setup IMO

[Batman]

Tune it! And try bumping the air pressure in your tires! With 2.73's you are probably bogging th emotor down alot if your tire pressure is too low. Also do you have the stock LT4 cam or the LT4 "Hot cam"? I would definately suspect a bad tune if you are just using narrowband O2's, but check all your wires, take a look at your plugs. eliminate something mechanical or electrical before you do anything.

[NJSPEEDER]

i agree with the others, get a wideband O2 and have someone look over your tuning logs.

[Tru2Chevy]

Tune it! And try bumping the air pressure in your tires! With 2.73's you are probably bogging th emotor down alot if your tire pressure is too low.

He's got 3.73s now.....2.73s were stock.

- Justin

[Batman]

Oops......

[94lt4373]

Thanks for all the replies today guys I'll try to answer your questions first - I was spinning with street tires but I ran my best 60' 2.056 like that, It was my first pass ever 13.9 @ 98 and my fastest. Full lt4 conversion - heads, intake manifold, hot cam. BBK shorty headers, high flow cat and flowmaster. Timing never gets pulled, the knock sensor isn't picking up knock. I anvanced my spark maps until it knocked then I pulled it back. Now shes clean. I belive the injector pulse is just under 18, I'll check on that. I ran the MT's at 25 lbs.

I'm trying to find a shop near me in central NJ to get my car dyno tuned
That seems like the next step for me
Thanks alot for all the input,any more comments welcome

[Batman]

Yeah definatley check all your ignition parts and get it tuned, I thinl you'll be pleased with the results.

[94lt4373]

yea I'll check the ignition stuff, thanks batman

[Tru2Chevy]

There are very few places that tune LT1s.....I say your best bet would be to invest in a wideband O2 sensor, and keep tuning it yourself on the street and on the track.

Your stock O2 sensors are designed to work best right around 14.7:1, but that's not optimal for power. Since you are trying to get the A/F lower than that, your stock O2s won't be very accurate. This is where the wideband comes in.

- Justin

[94lt4373]

My dad just told me he found a guy near him (scotch plains) for $150 a hour he uses his own program on the dyno. Everyone says he is a brain. He is in rockaway - "Bruces speed shop". Anybody deal or hear of him?

[Tru2Chevy]

Just be wary of people that only want to tune you on a dyno, and don't do a street tune as well.

- Justin

[94lt4373]

I didn't ask if he did a street tune ... didn't know

[94lt4373]

Well my dad talked to him so I only know what my dad told me. My dad has a rice burner shop, but he has a 69 Stang vert, 69 Chevelle 396(Motor and trans just put in) and a 71 stang, hard to admit but they built a 9 second civic - 9.911 best at 152, they ran at island and E-town. Last saturday they blew a rod through the block in 4th and still ran a 10.823

[Squirrel]

LT4 converted cars have seen 350 RWHP correctly tuned with full bolt ons, you should be way in the 12's with a properly tuned car...i suggest you send some of your datalogs to madz28/pcm4less on cz28 and see what they have to say

[94lt4373]

just got home from island with the new tci 3000 rpm stall and it cut almost .3 in the 60' - .5 in the 1/8 and .5 in the 1/4. The guy thats gonna do my tune wanted the TC put in first so I thought I run it and see what it did alone. I was impressed but cant wait for the tune...

Before Torque converter Aug 12
R/T... .241
60'...2.112
330...5.991
1/8...9.140
MPH...78.26
1000...11.875
1/4...14.170
MPH...98.65

1st run tonight
R/T... .540
60'...1.854
330...5.541
1/8...8.623
MPH...79.31
1000...11.313
1/4...13.581
MPH...99.65

2nd Run
R/T... .868
60'...1.840
330...5.537
1/8...8.623
MPH...79.16
1000...11.319
1/4...13.594
MPH...99.30

I cant stand the single light tree on friday night and I was only interested in my numbers so I just launched when the other guy did. Thats why my rt's sucked but i still beat a rx 7 and a saturn they ran 14.2 and 14.3

So what do you think still just need a tune or what?

[bad64chevelle]

I think something is really wrong because you should be quite a bit quicker than that. I think you need a tune asap and see what that gets you.

[94lt4373]

Yup thats the next step

[j0n]

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[94lt4373]

If you trapped 109.x for real with what u have, I am gonna blow my head off with my DE .50 Ha ha r u for real man? can u prove it? not trying to be a dick but are u for real?

[j0n]

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[j0n]

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[94lt4373]

ok jon thanks... anyone else wanna say hi

[j0n]

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[94lt4373]

Thanks for the input, i need all the help I can get...

[94lt4373]

For a single mod I think there were big gains.

[bad64chevelle]

Tuning is amazing, it made a world of difference on my 94 when I had it. The car was just intake, headers, exhaust, 3:73s, subframes, drag shocks, and a tune. It was done by Jon Prevost, but I havent seen him on here in ages! It was probably the single best modification I did. I would hope it could wake that car up to where it is supposed to be, otherwise the driver mod could use work...

[JerzLT1]

My LT1 car has CAI, LCAs and !Muffler (plus a little weight reduction) and i ran a 13.33 @ 103.95. with the Bigs and littles and a little more weight taken out im looking at 12s without even being full bolt on... for now =)

[94lt4373]

That makes me feel better...NOT Ha Ha Ha I'm gonna get the tune done and if i'm not in the low-mid 12's I'm gonna be pissed. Anyone know a tuner near me if my guy craps out? PS whats bigs and littles mean?

[Tru2Chevy]

That makes me feel better...NOT Ha Ha Ha I'm gonna get the tune done and if i'm not in the low-mid 12's I'm gonna be pissed. Anyone know a tuner near me if my guy craps out? PS whats bigs and littles mean?

Bigs n littles = slicks and skinnies.

And I would take j0n's advice - if you don't get something good worked out with this guy, I would go to either MadZ28 or PCM4Less

- Justin

[JerzLT1]

Bigs n littles = slicks and skinnies.

And I would take j0n's advice - if you don't get something good worked out with this guy, I would go to either MadZ28 or PCM4Less

- Justin

im going with MadZ28, jerkoff has proven that his tunes work so thats what im goin off of. i mean look at when his car did???

[94lt4373]

Well I got a tune from madz28... then my car was bouncing of the rev limiter on full out shifts. Ion thought it was my trans slipping so I brought it down to my dads shop and hooked it up to their computer. Ion was dead on so the trans is getting pulled monday. That would explain some lost time in the1/4

[j0n]

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[98tadriver]

im too lazy to read all the pages and i dont know much about LT1s but id say get a good stall at least 3000 maybe 3200rpm, if you dont have headers, get those, and looking at those low trap speeds, id say it might be pulling timing perhaps. i remember when i was running 12.5's at 111 one time then 12.7 @ 109 im like wtf?? it was pulling 4* of timing and hurting my top end. you are running 93 octane as well right?

[98tadriver]

100%...I believe bad64chevelle was there and witnessed that pass. I spun a bit in 1st which resulted in that trap speed. Later in the night i cut an awesome 1.77 sixty and went 12.700 at 107.96. Please don't blow your head off though :mrgreen:


you called me that night all amped and stuff and then i got amped because u pulled a 12.7 and the amperage was definately up that night!

[94lt4373]

Last run 13.1 @ 106 at island still burning out at the line

[98tadriver]

Last run 13.1 @ 106 at island still burning out at the line

a marked improvement! was that last run with the crappy trans?

[94lt4373]

New Pro Race Level 2 PerformaBuilt Trans - 3000 tci
BBS Shorties, 93 octane
also... electric cut-out, flowmaster, MT's drags,CAI,LT4 conv.

[bad64chevelle]

To me that sounds really really slow still for that combo...maybe it needs the driver mod?

[98tadriver]

To me that sounds really really slow still for that combo...maybe it needs the driver mod?

Its an automatic lol. you dont need the driver mod! get the tires to hook and punch it!

[bad64chevelle]

Its an automatic lol. you dont need the driver mod! get the tires to hook and punch it!

:lol: you should ask Martin why his Lightning is stuck in the 14.4 range, and Nicks Runs 13.3. Same Truck, Same mods, been in both trucks they are equally quick, but somehow there is a full second missing...

[Anti_Rice_Guy]

:lol: you should ask Martin why his Lightning is stuck in the 14.4 range, and Nicks Runs 13.3. Same Truck, Same mods, been in both trucks they are equally quick, but somehow there is a full second missing...

I have a lightning? Who stole it?! :drive:

[94lt4373]

I just bought the driver mod ha ha...

[98tadriver]

I just bought the driver mod ha ha...


lol good! now hit 12s! :)

[94lt4373]

What rpm should i take off at?

[98tadriver]

whats your stall converter good for again? alot of A4 people seem to have luck with "Flashing" the converter. Basically, if your tires can hook, you sit there at idle, and when youre ready to go down the track, HAMMER DOWN! the rpms jump up, torque multiplies and u take off like a bat outta hell. A4 guys with stalls or knowledge on them could tell u. im pretty sure right on that

[bubba428]

I had good luck "flashing" the stocker dropped .1 off my 60' and my 1/4

[NJ Torque]

If you want a hand tuning, I could always try to help, I have a scanmaster and datalogger... Also to help set the car up and show you a few pointers about luanching.

[94lt4373]

Thanks NJ Torque, when the weather breaks that would be great

[1984camaroz28]

get that 60 down