Sy/Ty ECM running a TPI 5.7L V8...?

L

Lowaholic

New member
Alright, First off I want to say NO FLAMEs please! THis setup is NOT going into a SyTy- just my sh*tty old Blazer :wink:

The reasons I want to do this are numerous- $$ considerations, SyTy crates and/or parts are hard enuff to come by, plus the V8 is already in the truck anyways. So the question is, I'm looking to bolt some sort of supercharger (not decided what kind yet, centrifugal tho) on my TPI engine and run it with a SyTy ECM, mostly for reliability and to minimize complication and having to run all seperate modules/controllers (ie- boost,timing,etc). I've heard it can and has been done, anyone have any experience with this or experienced advice (not just 'that's f*king stupid, don't do it'...) as to why or why not head down this path? I definitely need some advice, I'm planning on starting to gather parts pretty soon so any help on what to keep an eye out for or what to avoid would definitely help!
 
leroy

leroy

Donating Member
I recommend searching the diy-efi.org archives. You should find everything you need to know there, if you're patient.

Jim
 
B

Bob H

New member
Lowaholic,
Am running 383 Whipple blower on my 88 Blazer with 7749 TY ECM right now and have also played with 7730 Cam. ECM. Also have done combos of both together. Fairly easy to hook up but a bear to tune VE tables.

I have a pic of engine in 88 I can email you or can talk to you if any help.

Bob H
 
L

Lowaholic

New member
Hey again all. Yeah, any info definitely helps right now- I just started looking into trying this. I'm just heading off to work now but I'll have to check all those links out when I get home later. I noticed I've seen alot of references that mention the vehicles that the 7749 ECMs originally came in, one of which being the '88 2.3L Quad-4 cars, but no mention of any turbo option - do those cars have to be turbos or did all '88 Quad-4s use that ECM for some reason?
 
S

smeagol

Active member
They used it in all I believe (of that year) just that the program was different, ie not $58. The Sunbird used the same ECM and same $58 program.
 
L

Lowaholic

New member
Thanx for the links everybody- enuff to keep me busy for awhile gathering parts and straining the brain at the very least :wink:

- keep em coming!! :D
 
L

Lowaholic

New member
ok, some more newbie q's-
Bob H, you mentioned the VE tables are a pain- is that in general for the 730/749 or for running both simultaneously?

Also, how do you hook up the bypass valve on the charger, just like the wastegate is on a stock SyTy? ie- manifold psi is controlled by ECM via a regular wastegate solenoid?
 
B

Bob H

New member
lowaholic,
The combo I refered to was 730 memcal with TY bin in 749, 749 memcal in 730 and 749 with 2-bar maps and 730 memcal in 730 with 1-bar.
I was using a command wiring setup and swapping pieces. Noticed right off ECMs were pulsing inj. diferently so p widths changed to the tune off needing 50-60% change in VE tables. After retracing pin outs on ECMs 4-5 times, I unhooked one of the inj grounds for 730 setup to try 749 only. I think helped a little. Main cause I found was a defective new memcal (BBZB) that I got from GM dealer. Another memcal purchased from fellow that tried to make me a memcal brought 749 VEs a lot closer.
Then discovered that KS was almost constant with TY memcal so tried 730 memcal with TY bin loaded. (I think because of KS board on memcal being wrong frequency for V8)
Trying to remember high points as this has been a battle over last 3 years.

I just finally found a chassis dyno and made some pulls yesterday. At least it stayed together but now have new issues with AF changing 1 point on WB with no apparent cause anywhere in tables and shows steady on Diacom reading stock O2s, inj widths and ect. at same time.

To me, 730 with extra fuel added in boost was easier but did no tuning back then. Just ran some spare TPIS, AS&M, S&P, and etc. proms I had. All ran OK.

Wiil stop at that as to long but if you need to discuss, can email off forum or give you a call.

749 is coming along so another year may get it.

Bob H
 
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