If you want to see what a GM ECM can support HP wise here's a clue. This is by no means a Drag Racing Set up, but a daily driven GN. Every prom tweak imaginable has been made. My next ecm with be without the on board ROM, so all the programming will be available for tweaking. With (6) 55#/hr injectors, you can do the math on what cranking the boost up means. At 28 PSI of boost on pump gas I popped the headgaskets, but just had to learn what the limit was for my combo. Oh, and BTW, there was no trace of detonation, is was a matter of just lifting the heads.
With the SEFI I run a 2.1 PW at idle, and cruise is 3.2 msec.. WOT is 11.8:1 AFR, and lean cruise is at 16.8. Those numbers are for follks to start with, but rather what you might be able to run if you get things right.

http://www.gnttype.org/techarea/engi...relocate3.html

While this URL is about the intake tract I can assure you as much detail has gone into every element in this car. How's that for an ol phart's car?.

 

lol, you never suprise me grumpy.

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

Does this have anything to do with PROM burning or are you just showing off???

 

It has everything to do with prom burning. There are well over 50 tables, and probably as many single point entries changed.
Min. of 2HP per CI, 25 and probably closer to 30 miles per gal., with perfect manners is all about prom burning. Integrating Hot Rodding, and prom burning just happens to be what this list is about. This car reflects that.

 

So in other words, its about PROM burning AND showing off Nothing wrong with that, gives us all something to shoot for! Pretty radical setup.. at least for an old phart like Bruce!

 

28PSI on the stock engine? Dayum. I take it that you had to be running a 3-bar map? I thought that the GN ECM only supports a 2-bar map?

Tim

------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

Almost stock <g>.
GNs use a MAF system. With the Translator Plus, extender chip, and late MAF I can read to 510 grms/sec.

Syclones came with a 2 bar MAP system, and Brain Greene did a recal that allows using a 3 bar MAP sensor on them.

 

Very nice Grumpy. Very unique, I have never seen anything like this before. It's food for thought definitely.


------------------
-Bill


-=1987 Buick Grand National=-
Almost Jacked Up Like a Mother


*CC 218/218 cam, ported and polished heads (1.77, 1.50), Accufab AFPR, custom 3" DP by Custom Tubes, dual 2.5" exhaust, Bilsteins, Walbro 307 hotwired, Big Mouth cold air intake, 009s (42.5# injectors), custom PROM and 20psi of fury*
SOON to have alcohol injection


Wanna try me?


-=ICON Motorsports=-


Modertor TPI board

[This message has been edited by Bill87GN (edited July 11, 2001).]

 

It appears that you are running the GN setup still, how does the 3 bar Sy/Ty code figure into it? is it just for reference? The GN does not have a MAP @ all does it?

BW

 

The GN does have a MAP sensor

------------------
-Bill

-=1987 Buick Grand National=-
Almost Jacked Up Like a Mother

*CC 218/218 cam, ported and polished heads (1.77, 1.50), Accufab AFPR, custom 3" DP by Custom Tubes, dual 2.5" exhaust, Bilsteins, Walbro 307 hotwired, Big Mouth cold air intake, 009s (42.5# injectors), custom PROM and 20psi of fury*
SOON to have alcohol injection

Wanna try me?

-=ICON Motorsports=-

Modertor TPI board

 

The syclones (AWD GMC Pickups) used a 2 bar MAP system. Entirely different then a GN setup which is MAF. The reference to the 3 was just that someone has hac'd the sy code and made a 3 bar version.

The GNs have a MAP sensor but only to use for a LED boost incdicator. Nothing at all to do with engine management.

 

Kinda miss leading to even say that since it's just for the dash boost indicator.

 

Might be misleading but it's true.

Yes the GN has a MAP sensor, but it's not used for fuel management or anything like that....is that better?

------------------
-Bill

-=1987 Buick Grand National=-
Almost Jacked Up Like a Mother

*CC 218/218 cam, ported and polished heads (1.77, 1.50), Accufab AFPR, custom 3" DP by Custom Tubes, dual 2.5" exhaust, Bilsteins, Walbro 307 hotwired, Big Mouth cold air intake, 009s (42.5# injectors), custom PROM and 20psi of fury*
SOON to have alcohol injection

Wanna try me?

-=ICON Motorsports=-

Modertor TPI board

 

thank you gents, that clears it up. Kinda what I thought.

Bruce,

I know you have run the Sy/Ty code in a 7730, how did it work out for you? if someone has done the hard work & made the modifications to the hard code to get a 3 bar map in it, why dont you run it? (my guess is 'cause the MAF setup works so well for you) Sounds to me like if you were doing a big boost setup this would be the ticket, specially if you were starting from scratch & working up.

BW

 

GNs are MAF, i believe you on the no detonation grumpy, ive worked on and played with many GNs, and with a strong engine, you can easily boost these things to 25psi without having a single problem.

 

And since this thread has degenerated to nonsense it's closed.