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I have an opportunity to purchase a 2.8 with multi port injection out of a RWD Firebird. Is it possible to put the multi port on my 3.1 hybrid TBI S10?
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'86 S10 Blazer 4WD, '87 2.8 with 3.1 crank and pistons, A.R.I. "Stage 2 Cam", Iron Heads with stiffer springs, Holley TBI, Manifold bored to fit the TBI Base(4.3 size), Fiero Covers, MSD Coil, DynoMax Muffler and 2.5 Tailpipe, no cat, Auburn Limited Slip, 3.73 final Drive. 700R. '85 Fiero GT 3.4 Hybrid, relieved top intake and exhaust, 57mm TB, Auto. 3.06 final drive. -
if you have the irons then yes. the main change is the wiring of your injector harness. and tuning of course. ive been told that the injector drivers for the 8062 ecm will be able to support 6 injectors when batch fired.'86 Grand National
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I have a friend that put one in his s-10 all he done was spliced into the two injector wires and made 6. he didn't tune for it and runs fine.Comment
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Same ECM?'86 S10 Blazer 4WD, '87 2.8 with 3.1 crank and pistons, A.R.I. "Stage 2 Cam", Iron Heads with stiffer springs, Holley TBI, Manifold bored to fit the TBI Base(4.3 size), Fiero Covers, MSD Coil, DynoMax Muffler and 2.5 Tailpipe, no cat, Auburn Limited Slip, 3.73 final Drive. 700R. '85 Fiero GT 3.4 Hybrid, relieved top intake and exhaust, 57mm TB, Auto. 3.06 final drive.Comment
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Hi there!
I wouldn't trust the TBI ECM to drive six injectors and live very long. It would depend a lot on the heat loading in the drivers. Besides, it's definitely not tuned properly and it's giving up a lot of the benefits that the newer ECMs give you. It's not really the right way to go, and you won't get the full benefit of the MPI swap if you try to use the TBI ECM.
Grab the EFI hardware from the Firebird, its ECM and harness. It's a bit of a job but it isn't impossible. I suspect your existing dash harness connector is pin-compatible (check to be sure but GM didn't seem to change this much in this era) so you're really only replacing the ECM harness. Almost everything you have that's on the engine (i.e. O2 sensor, MAP sensor, etc.) can stay. You may need to change the throttle, cruise, and transmission TV cables for the Firebird ones if the stock ones aren't the right length.
You will also need to replace your in-tank fuel pump with one for the Firebird (just the pump, not the whole in-tank assembly). You will need to replace the rubber lines in the system (i.e. the hoses that connect the fuel tank to the steel fuel lines, the hoses from the frame to the fuel rail, etc.) with "fuel injection" hose -- this is rubber hose that has a higher burst strength. Use "fuel injection" clamps, too -- they're rated for the higher pressure. They're really cheap and they're nicer clamps. I use them even on low pressure lines because I like them better.1982 Chevrolet S-10 Sport, 2.8V6 TBI
2006 Pontiac SolsticeComment
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it wont hurt the tbi ecm to run pfi at all. the tbi drivers see the same load with the tbi injectors and they have a longer pw. its been done before. wish i could explain it like it was explained to meOriginally posted by jwvess00 View Post
'86 Grand NationalComment
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Sounds like quite a bit of work. What are the gains?'86 S10 Blazer 4WD, '87 2.8 with 3.1 crank and pistons, A.R.I. "Stage 2 Cam", Iron Heads with stiffer springs, Holley TBI, Manifold bored to fit the TBI Base(4.3 size), Fiero Covers, MSD Coil, DynoMax Muffler and 2.5 Tailpipe, no cat, Auburn Limited Slip, 3.73 final Drive. 700R. '85 Fiero GT 3.4 Hybrid, relieved top intake and exhaust, 57mm TB, Auto. 3.06 final drive.Comment
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personally id rather stick with tbi, the mpfi 2.8/3.1 f-bod intakes didnt really flow that great unless you do some major porting. the only reason i wanted to do that to mine is its easier to use when boosting. its not really alot of work. just the injector harness on the tbi needs to be spliced into the injector harness on the mpfi, thats about it. i know treuleo makes a high flow upper intake for the mpfi that flows good. the chip tuning would be the hardest partOriginally posted by Ray Hamilton View Post'86 Grand NationalComment
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he's been running the same ecm for 2 1/2 years now.Originally posted by Ray Hamilton View PostComment
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Thanks for all the replies.'86 S10 Blazer 4WD, '87 2.8 with 3.1 crank and pistons, A.R.I. "Stage 2 Cam", Iron Heads with stiffer springs, Holley TBI, Manifold bored to fit the TBI Base(4.3 size), Fiero Covers, MSD Coil, DynoMax Muffler and 2.5 Tailpipe, no cat, Auburn Limited Slip, 3.73 final Drive. 700R. '85 Fiero GT 3.4 Hybrid, relieved top intake and exhaust, 57mm TB, Auto. 3.06 final drive.Comment
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anyone have the pinout schematics on the s10 and the camaro MPFI? ive actually been looking into this a lot. would prefer the MAF setup, and probably use the 3.4 intake for good flow characteristics. im just not happy with my current TBI setup. im going to try the 4.3 TBI and ported intake first and see what i get, but im not expecting a whole lot.
anyway, this thread is the most ehelp on this swap ive found. does anyone know what injectors the 3.4 camaro runs? because if i do this, it will be done in preparation for boost. near as i can tell, ill need about 19lb injectors for 6 lbs boost.Comment
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Hi there!
Someone on here can probably answer better than I, but the 3.4 SFI F-body intake I've got has what looks like the same injectors as on GenII V6/60 engines. I haven't actually tried to swap them to know for sure, but I suspect you could run them with a 1227730 or similar ECM ('91-'94 V6/60 MPI system) without any problems.
Why MAF? The MAP ECMs for V6/60s are much better ECMs than the MAF ones or the TBI ECM.1982 Chevrolet S-10 Sport, 2.8V6 TBI
2006 Pontiac SolsticeComment
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reason i wanna go MAF is that the guys over at thirdgen.org have been using that system to put about 7 lbs of boost to the 3.1/2.8 cars. they just draw the air to the turbo through the MAF.
MichaelComment
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I've heard that upgrading the throttle body with a bored intake makes a night and day difference. I'd give that a try first. Heck of a lot less work...
I converted my 1990 Trooper from a 2.8L TBI to 3.4L SFI with the 94-95 ECU. I'm in the process of now converting it to a 1227727 ECU.
The 3.4L F-body isn't a MAF system, is it???'98 Volvo V90 - Ford 5.0 swap in progress
'96 LR Range Rover 4.6 HSE - suspiciously reliable
'92 Volvo 740 Wagon - former parts car, now daily-driver beater
'71 Opel Kadett Wagon - 1.9L CIH w/ Weber DGV 32/36, in bitsComment
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yeah, ive heard that too. and ive already got the stuff, the machine work done, etc. just have to do it. like i said before, if it doesnt do it for me, im going boosted.
no, the 3.4 was never availible MAF. i was planning on using that intake and TB, as it flows a lot better than the old 2.8/3.1 setup. backdate the electronics and sensors (except for injectors) to the MAF cars. id assume (aw, crap. last time i did that.....) that the sensors will adapt with little to no modification between the manifolds.
i was just wondering if anyone else had done the TBI to MPI swap, and had pinouts and experience.
michaelComment
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