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05-05-2008, 08:07 PM
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#1
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15 Second Club
Join Date: Nov 2006
Posts: 390
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tpi vs tbi
Hey guys my brother is giving me his 91 rs v8 camaro. I have an 87 iroc-z when I put my motor in his car do I have to do anything to the feul system and if so can someone explain it...
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05-05-2008, 08:26 PM
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#2
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11 second club / Moderator
Join Date: Aug 2004
Location: West Berlin, NJ
Posts: 7,148
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-TBI requires around 14 psi of fuel ... TPI needs around 42 psi. therefore the pump needs swapped. Should be ok with fuel lines .. I think
-Wiring harnesses need swapped (your 87 has 8+1 injectors, as opposed to the TBI's 2 and the sensors are all different)
-Also your 87 TPI uses MAF, while the TBI uses MAP, with is also among other reasons you need to swap the ecms)
-Shouldn't have vats issues when you put the 87 ECM into the 91, but I never experimented with it so I'm not sure)
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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05-05-2008, 08:33 PM
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#3
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15 Second Club
Join Date: Nov 2006
Posts: 390
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Yeah im taking the wire from my car and puting in the 91 . Im Switching the motors cause the 87 has a 5.7 and the 91 only has a 5.0....I am switching everything cause the floor bord in the 87 is all rotted out and the 1/4 panel is messed up to . So my brother told me to day I can have his 91 since he dont drive it anymore...
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05-05-2008, 08:36 PM
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#4
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11 second club / Moderator
Join Date: Aug 2004
Location: West Berlin, NJ
Posts: 7,148
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good luck to you then
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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05-05-2008, 09:00 PM
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#5
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12 Second Club
Join Date: Sep 2004
Location: Vineland
Posts: 928
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Its not a matter of "it wont work."
its probably been done thousands of times, try searching somewhere like TGO, i wouldnt be suprised if they had a step-by-step instruction manual.
All I'm saying is that in your hands, you are potentially taking 2 running cars and making them both not run to only have an imcomplete project get done half-assed.
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87 iroc with the usual go fast stuff
heavier than your half ton.
Last edited by BonzoHansen; 05-06-2008 at 03:41 PM.
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05-06-2008, 10:48 AM
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#6
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11 Second Club
Join Date: Feb 2006
Posts: 932
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Or drop in the 350 from the 87, convert the TBi harness into a TPI, add one 730 ECM and one walboro 255... Wala TPI 350 RS. 
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2004 GTO GMM shifter Spohn stuff, tint and my love......
1988 Camaro Vert -Sold
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05-06-2008, 10:53 AM
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#7
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11 Second Club
Join Date: Feb 2006
Posts: 932
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2004 GTO GMM shifter Spohn stuff, tint and my love......
1988 Camaro Vert -Sold
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05-06-2008, 03:41 PM
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#8
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Quick reminder - if you have nothing nice to say then don't say anything.
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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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05-06-2008, 03:59 PM
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#9
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12 Second Club
Join Date: Sep 2004
Location: Vineland
Posts: 928
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love you too Bonzo!
thats nice!
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87 iroc with the usual go fast stuff
heavier than your half ton.
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05-06-2008, 08:57 PM
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#10
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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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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05-07-2008, 08:59 AM
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#11
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Join Date: Aug 2004
Location: Hillsborough, NJ
Posts: 3,200
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The Iroc probably has TPI, right? So a straight swap shouldn't be a problem, just swap out everything from the 87 and remove the pieces from the 91, which includes the ECM (and maybe fuel pump).
Where does the TBI part come in? Are you contemplating TBI instead? If I recall correctly, TBI has 19lb/hr injectors and TPI has 24lb/hr injectors in a stock config. If you want better gas milage (for a daily driver or cruiser) then the TBI setup may be better for you. If you want quick off-the-line response for racing or street work, then the TPI (MAF, not SD) may be better for you.
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I USED TO HAVE an 85 Camaro 305 4bbl, 90 Firebird V6, 97 Firebird V6 (10 speakers!). Despite the two family vehicles, 3 kids, wife and mortgage, I can finally realize the dream - 88 TA almost all stock... for now.
http://www.cardomain.com/id/untameddave
Wanted this -  , but ended up with this -  for free. Can't argue with free.
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05-07-2008, 10:54 AM
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#12
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11 Second Club
Join Date: Feb 2006
Posts: 932
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Quote:
Originally Posted by Untamed
The Iroc probably has TPI, right? So a straight swap shouldn't be a problem, just swap out everything from the 87 and remove the pieces from the 91, which includes the ECM (and maybe fuel pump).
Where does the TBI part come in? Are you contemplating TBI instead? If I recall correctly, TBI has 19lb/hr injectors and TPI has 24lb/hr injectors in a stock config. If you want better gas milage (for a daily driver or cruiser) then the TBI setup may be better for you. If you want quick off-the-line response for racing or street work, then the TPI (MAF, not SD) may be better for you.
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Almost..
TBI has two injectors at 48lb an hour with 13 or so psi. The 350 TPI has 8 injectors, at 22lbs an hour at 48psi. For off the line TBI and TPI are comparable. TPI can be tuned to have excellent gas milage. My old iroc had a 350 with a Lt1 cam, 1.6rr's, 1094 head gaskests, and the usual exhuast stuff. Was getting 28-30mpg on the highway when it was a 6 speed.
The big reason why I said to use the TBI harness and convert that is because, well the harness is in the car, less work to convert it over than to try to make the 87 split harness work with the 90-2 stuff at the C100 connector and C207. Not only that, he can prolly sell the maf stuff for a few bucks to recoupe the costs of doing the swap. Most of the swap over to SD you can get at the junk yard for under 50 bucks (ECM and MAP) Just finding a prom to work with it is the harder part. ( www.tpiparts.com) I think that is the correct web site.
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2004 GTO GMM shifter Spohn stuff, tint and my love......
1988 Camaro Vert -Sold
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05-07-2008, 12:55 PM
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#13
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Join Date: Jan 2007
Posts: 5,623
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I have a TPI computer and harness, your going to need to swap the dash too if you don't have a 145 speedo. that would be the easiest thing to do.......PM me and we can discus.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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05-07-2008, 01:37 PM
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#14
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Power Member
Join Date: Jul 2006
Location: Old Bridge, NJ
Posts: 2,415
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Your easiest option is to take the 91 harness and have it converted to tpi by tpiparts.net . This way everything is plug and play, then swap only your engine over and keap the serp set up from the 91 you dont have to swap the trans. This way you do not need a maf or 9th injector anymore. All you will need is a new map sensor , 730 ecu and a new fuel pump. The swap is not all that bad. This is what I did to my 92.
Last edited by Fast92RS; 05-07-2008 at 01:40 PM.
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05-07-2008, 09:24 PM
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#15
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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Quote:
Originally Posted by Kid Racer
Hey guys my brother is giving me his 91 rs v8 camaro. I have an 87 iroc-z when I put my motor in his car do I have to do anything to the feul system and if so can someone explain it...
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i thought you were daily driving your brothers car, and doing a T5swap in your car?
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01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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05-07-2008, 10:33 PM
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#16
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15 Second Club
Join Date: Nov 2006
Posts: 390
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yeas ron but that was before i found out the whole underneath is rotted out in my 87
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05-07-2008, 10:47 PM
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#17
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by Kid Racer
yeas ron but that was before i found out the whole underneath is rotted out in my 87
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Post a picture of the "rot". I have a very hard time believing that it's the whole thing.
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05-08-2008, 04:38 PM
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#18
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Join Date: Jun 2007
Location: Arm pit of the world... NJ
Posts: 2,676
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Quote:
Originally Posted by WildBillyT
Post a picture of the "rot". I have a very hard time believing that it's the whole thing.
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Bill knows "rot" when he sees it. 
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John
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05-10-2008, 07:40 PM
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#19
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15 Second Club
Join Date: Nov 2006
Posts: 390
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Hey guys juss leting every one now how today went, got the motor and wiring harnis out of the 91 rs today...And tomorrow I am doing the 87 iroc...I'll keep you guys updated...
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05-31-2008, 04:51 PM
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#20
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15 Second Club
Join Date: Nov 2006
Posts: 390
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well the swap is almost done..me and my pop are going to try and start it up tomorrow and see what we get...
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05-31-2008, 04:56 PM
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#21
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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nice, hopefully a good rumble is what you get
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06-02-2008, 01:21 PM
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#22
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15 Second Club
Join Date: Nov 2006
Posts: 390
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Well we tryed to start it up yesterday but we got nothing we got power to the key but it didn't even try to start.. My feul and oil gaege aint reading. My winsheld wiper switchs turns on some of my out side lights.. But I have power inside the car the radio and all comes on but thats it... So know I have to figure out why..
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06-02-2008, 06:43 PM
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#23
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Power Member
Join Date: Jul 2006
Location: Old Bridge, NJ
Posts: 2,415
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Check your PM's
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06-02-2008, 08:35 PM
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#24
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Stalker
Join Date: Aug 2004
Posts: 12,077
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im assuming you changed the dash harness as well... and the ecm etc...
cuz just swapping the engine harness won't cut it
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06-12-2008, 08:17 PM
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#25
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Join Date: Feb 2005
Location: Little Egg Harbor NJ
Posts: 1,175
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also i hope you changed the rubber pieces of fuel line to fuel injection hose. i had a piece blow apart inside the tank shortly after my swap
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2011 Camaro 1SS Cyber Grey Metallic
2005 Silverado
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