Has anyone ran a turbocharger with a factory mass air ecu it's a 1986 Trans Am with a fully forged 350 ZZ4 block and ported vortec heads with a stealth ram and a T-56. I plan on running a T70 or T76 I'm not looking for top end power, I'm looking for a great street engine between 525-600 horsepower so between 6-8psi but I want boost from a lower rpm like 2500 to redline. But I don't want to buy an aftermarket ecu I'd prefer to run my factory ecu and have a good running driver I'm not looking to make it a drag car.

 

Eh its possible maybe, look at blowerworks.net and read posts here by tequilaboy

they have a modified bin file and maf sensor for it that can read more airflow. Boost wise im not sure how much it would take to max it out

better idea would be to repin to the 730 ecm from 91-92’s. Run boost code here $8D-T or code $59

may need more than 6-8 psi to get to 600 hp tho. Depends on the cam with the vortecs. 400 hp on motor could get 600 on 8-9 psi. Thats good for a t70, but p trim being a bit small might be better with the t76

 

I've already dyno'd 486hp and 471ft/lbs might change the cam though to comp 8-502-8 I've heard horror stories about fast xfi and holley sportsman is just expensive

 

Yes, GM did. $31T has been emulated by the F-Body guys for about a decade now rescaling the LV8. Bob Bailey brought this concept here about ten years ago, and after everyone grasped how GM did this for the Grand National, members ran with it and came up with their own versions and explanations. But to your original question, yes, GM did this decades ago with the Grand National...

- Rob

 

wow thats a lot of power for that setup. Must be very good heads

 

I'll say. Those Vortecs must be maxed out and close to 250 CFM.
Curious as to what your current cam spec is.
That said, moving to Comp's 08-502-8 and 269 degrees of advertised duration is going to seriously curtail the output.

EDIT: Don't get me wrong here. I'm a Vortec "fan" and am running an aftermarket version myself. And ported on top of that. That being the case, I'm always interested in other similar builds for reference. The books say 500 HP is achievable with these (my) heads (255 CFM), the right cam (288 adv) and 6300 RPM out of 355 CID. But that's a dyno engine. I'd be expecting about 400 RWHP (with a 15% drivetrain loss).

 

Dont need a big cam with boost

 

True enough. I was thinking more along the baseline as the starting point. Start with less, end up with less for a given boost level.

 

I'm running high compression close to 10.7-1, and yes I did a lot of work to the heads just short of cnc porting 2.02/1.60 valves the biggest thing is to not hurt what the factory perfected. If you polish the entire chamber it will hurt performance the top corners need rough casting for proper swirl. I know my compression is kinda high for a turbo but I'll only be running 6-8 lbs max. This isn't my first turbo car I've had a 91 syclone and my Cadillac XTS-V is twin turbo I'm in the middle of tuning it now so far we're at 382 four wheel horsepower with just a tune next is exhaust and blow off valves because the factory ones bleed off at 9psi. I just need to know it's possible to get the factory ecu to work maybe I should be talking to my buddy Kevin about it.

 

I can't say I'd be of any help with the original question but I'm liking the NA build. I've spent a lot of time in the Vortec world and am familiar with the techniques. It's nice to see another successful result. Hoping I'm next.
Good luck.

 

Kinda helps that my business partner is Richard Langson 93 IHRA world champion I've been able to pick the brains of some of the original hot rodders of the NHRA & IHRA. You wouldn't believe some of the stories they tell like Don Garlits running one iron head and one aluminum and when asked about it he said the engine doesn't know the difference I needed the compression up on one side.

 

Did you tune the 91 syclone?

if so you would be familiar with the code $58, and thus would be good to go with code $59 that I recommend but does need the 730 ecm swap

thats the way i would do it. I had success on that system

 

Yes I tuned the syclone but it was easier back then Kenne Bell had everything for it. I had a front mount intercooler, 6 switch ecu with valet mode and no start mode. Daily driver, street performance, street strip, and full race, there was a ton of aftermarket parts available back in the day. But I found a new drop in ready ECU for under 550 it's the EBL

 

Yeah ebl will work. I did one on a procharged 383. Im not sure how the conversion worked, but he had a 2 bar map and it was a maf car originally. But i think an 85, so it would have needed a conversion to later 80’s maf or 91-92 anyway. So yeah ebl will work and tune same way as we tune stock 6e and 8d stuff.

 

Yeah 85 is a one year only ecu luckily I have an 86 the 7165 I believe is 86-90 and map is 91-92. The ebl is the best deal for the price only need to change 4 pins at the ecu and 3 pins from the map

 

Can y'all please post pictures of how you mounted your turbos. I'm thinking about building an air to water intercooler that doubles as an engine cover