Hey all... I've recently acquired a 91 RS with a 3.1L. I already have a blown carburated V-8 Camaro, so I'm not new to forced induction. I am however new to ECM tuning. On a carb its not hard just rejet set the boost retard module and go. I'm not sure exactly where to start with the 91's SD FI system. I'm looking at twin turbos (probably Garrett T3's) and boost range around 12-15lbs possibly more, but I don't want to get to far ahead of myself. I know about the TunerCat software and I've done some extensive research on the tuning side. I've also read a couple of posts about the 2 bar MAP sensors. From my understanding this car uses a $88 mask. I'm planning on building a forged internals 3.1 for this but for r&d purposes I'm gonna test with junkyard turbos and motor and low boost levels to get my tuning skills honed. If anyone has any idea as where to start please enter your $0.02 worth (although I'm sure it will be worth much more).

I'll be using the same cam in both motors and porting all the flowing parts (i.e. heads, intake/exhaust manifolds, etc.) Basically aside from forged parts and lots of $$ the test motor will be the same as the real motor, same compression (8.5:1) same heads and port job, cam, etc. I'm looking at using the Crane PowerMax H-260-2 because of its 112 lobe seperation will keep the overlap low and prevent loss of boost. Dyno2000 simulations show the max power to be around 6500rpm. Any info or advice would be much appreciated.

Thanks,
Brian

 

I would use the $8F. Its for the 89-90 Turbo Grand Prix 3.1 MPFI
Runs in a 1227727, but it should also work in a 7730.
I believe the most up to date BCC is AUFR...

May also want to look over this software.
It includes a definition for the normally aspirated version ($A1) of the same motor, but the $8F turbo definition for the software is also available.

 

i wonder if the converse is true. will $8f run in a 749 ?? hmm i would like to try the later codes are always a bunch better. anybody tird this one yet ?

 

So for running the $8F mask would I need all the sensors off of a 89-90 Turbo Grandprix? My biggest question is on how to get the computer to recognize a higher than 100kpa vacuum, or boost rather. Or should I just add a MSD 6ALBTM and use the boost timing retard from that?

BTW I made the cable for the WinALDL and tested it on my dad's blazer. I have to say that is the slickest thing. I was dreading spending lots of $$$ on a scan tool for tuning and diagnosing. Now I just have to find something that will work on a higher than 160 baud computer.

Thanks for all you help so far.

Brian

 

Bout all ya really need is the 2-bar MAP sensor, you would probably want one of those anyway. I dont think that several hundred dollars worth of MSD equipment is even going to come close to a 2-bar GM engine management system. You burn a prom, snap it in, toss on a 2-bar MAP, tuner up, and away you go.
It just does not get much cheaper and easier than that.... :-)

 

The $8f is DIS, SD, 60 V6. Might make it work in a 749, but I would probalby just opt for the sy/ty $58 for that. The DIS does have its advantages on a boosted motor though..

 

well a birdy told me how to make the DIS run with $58 but it takes a bit of trial and error to get right. what i am wondering is how much better is the de in terms of driveability. are the tables larger better ve division highway sparl mode ?? there are the things im looking for. trying to get the honda to factory driveability levels and beyond. so any ideas on where i can pick up a hack tunercat has no tdf ?

 

DIS. Is that Distributorless Ignition System? And if so will that work with the 3.1s distributor? Too many variables my heads gonna explode! I am however happy to hear that i don't need to buy all the MSD stuph. Thanks Mechanic.


Brian

PS
Where can I get the $8F from?

 

if you have a distributor use the 127749 and use $58. you could repin your current 1227730 and use $58 lot of people do it. you just cant use low impedence injecotrs thats about it.

 

The Typhoon/Syclone computer will work fine with the 3.1's stock wiring harness and fuel injection? I don't know a whole lot about the turbo trucks so I don't know whether their PFI or TBI or what... I just looked into that $58 mask and its got everything i'm looking for. I think it will be perfect as long as I don't have to swap out the wiring harness and stock EFI. It seems to have all the boost goodies I'll need so I won't have to have a seperate turbo controller, I can keep everything within the cars computer.

 

it should in thoery work within the cars 3.1 harness you will of course have to repin for the 1227749 alot of things will stay put but some other things iwll need to be moved. just makes a list of the current pinout and then the pinout of the 4.3 syclone truck. then repin the ecm the same way. there will be a few things you wont be using for sure. if you need help email schematics of the 730 for you rcar or are they listed over at diy-efi ? il got look and see if i can find a list of pins to swap

 

May I have a copy of the $8F def file? thanks, Bob

 

Sorry about jumpin in here...

Anyone know how to change the pinout of the 89 2.8L SD harness to work with the turbo sunbird computer?

 

Now your talking to birds?.

If it takes trial and error, to get it to work, then the birdy ain't got it right.

 

DIS, and Distributor, code is different.
None of it just plugs in and switches from one to the other.

If you have a distributor then you'll want to use the syclone 749 ecm.

 

actually the code is the same. its the limits in max advance and retard rolling the dwell calcs to far. i found out what to set them at so now its no big deal.

80degres max advance
20 dergress max retard
60 btdc ref

have fun.

 

You can use the low impedance with some success, on the 749.

Look at the Sunbird application. It uses peak and hold injectors, 4 of them but you might get by with 6 since it is load sensing with the P+H drivers.

An ecm bench would answer the guestion about durability.

 

i can answer the durability questions with 4 p/h injectors. on a 730 i dont work the drive burns up in five to ten minutes of run time real world on a car idleing no less. as for the 749 yeah it might be able to handle the 6 p/h provided you have them wired up via the sy/ty.

 

WRONG, AGAIN.

Geesh, To use the P+H capabilities of the 749 you have to wire it up like the Quad 4/ Sunbird applications.