Ok here goes, been planning my build for some time now I own a 91 z28 with 60k on it...5.7 tpi 700r4 Bone stock. Is it possible at all for a guy to use the holley stealth ram and controll it with the stock ecm via a home programmed tune? I've learned that even my OBDI system spiders into everything (transmission, speedo, fuel pump, fans etc.) in my application and want to avoid the nightmare of removing it. (plus if I did I dont know how the h*!!@ I'd get everything to work right) I'm looking to get around 400 hp when im done general gameplan consists of...AFR 210's, HSR, 383 stroker crank 11:1,headers and a nice n tall bumpstick round .500 -.600 as I see it. So can I keep the stock ecm and tune it to where I dont kill everything else the ecm runs? Or am I gonna have to completely hack this thing apart to get any REAL power?

Nothing changes
Just need a new tune suited to new intake/ engine combo
Just remove wires from TPI items and plug into same on HSR

And I would say the 210's are to big; will get what you want with 195's

you might have to play around with the stock ecu quit alot, their has been a bunch of people running hsr, afr 195s and cam and stall to match with very good build threads on hear.
ive been told by some that it is just easyer to go with a fast ecu or sumthing alongs that line. i went with a tune from hawks , but have not put it in yet been waaay to busy at work to do anything fun.( btw im one of those people that did the hsr 195 and all the bells and wistles to go with it hopefullt it will be worth the wait and money

I'm running a HSR with a stock '165 ecm. The tune is not stock, just the ecm. No way would I pay the extra money for an aftermarket ECM.

I agree with DSmith for the extra cash, tune the stock one..The wire harness is not that big of a deal, you can find books that show you every connection, wire color, if you need to change something. The smog controls you can remove them from the ecm plug, giving you a little less wire to fight with. Just don't cut them off where they hang, I hate that nor does it look professional. Mine is running with 355 HSR, Edelbrock Roller cam, 24lbs Injectors, and Edelbrock Performer RPM Heads. Plus still should have the A/C and cruise to enjoy..

Stock ECM here as well, tune not stock. I had PCMforLESS.com do my tune, I'm too scared to learn how to program myself, lol.

91interceptorZ, How does that tune run??? I had looked at there website and have gave it some thought. Plus if I rember they can also dyno tune your combo...And there not to far from me in N.C...My tune came off of another board member, just had to burn it on a chip..It runs but rich, but still has great response from idle. I was just wanting to get mine started to break the engine in. Mine is back on the stand now, hopefully things are looking good for paint this spring. Plus I need to recheck my balancer, unfortunately it is a 6 7/8 and my pointer is a 6 3/4. A few weeks pull the head and make sure TDC is Tdc on the balancer....

Thanks guys, I knew there had to be a way...I was looking at aftermarket ecms I couldent find one that would allow me to keep everything all those would do is just fuel/spark...nothing with trans or a/c or fans etc. Im working with a guy from afr for my heads I was afraid the 210's would be too big, still waiting for my reply. Now I just gotta find a place around here that will/can tune obd I than and remove all the egr components....waste of power and added weight "dont need this anymore" :throws smog pump over shoulder: we got plenty of ozone....if nasa can keep blasting off rockets then I can keep blasting down the 1/4.

By the way are there any other snags I need to worry about with this...it would definately be nice to know ahead of time if possible.

400 at the tire or 400 on motor alone which is like 340 at tire?

210's arent too big if you are looking for a cam closer to .600 lift and 400 at the tires. 195's will get it done tho, my 383 did 400 at the wheels with those heads and a pretty aggressive hydraulic roller that was abit over .600 lift. Not needed tho. Mid high .500's is plenty with some duration

stock ecm works fine, a stock ecm powers my twin turbo car below

lookin for 400 at the wheels so prolly 460 at the crank or so. O wow man....twin turbo 401....predicting servere traction problems...theres no way you could ever really just punch that thing unless rubber smoke is what youre after. Very impressive car what do you have for hp and tq? or has it even seen a dyno.

Converter is wrong for my setup, its getting restalled but on the mustang dyno it did 640whp at 12.5 psi. Tune was ok. I expect 660-680 or so with a leaner tune at same boost atleast i hope so.
17.5 psi it did 690 but it was piggg rich. I expect 750's out of it with 15-16 psi once tune comes around and i get a better converter.

Torque output is inaccurate i think, it registered 1086wtq on the initial converter flash and declined rapidly from there since it was already past peak tq rpm... I estimate in reality its in the 650-750wtq range depending on boost.


Stock ecm is capable of handling that hp. I think the max rpm you can control fuel at is 6400 rpm with the 730 ecm which is in the 91-92's fbodys. Your 383 will only need to peak by 6300-6400 to make 400whp and that last fuel cell at 6400 will be enough to handle fuel to 6800+.

I had mass air flow system on the 165 ecm from 1989 on my 383. peaked hp at 6300 but held it flat to 6500 and i shifted 6600-6800. Fuel control to 6400 rpm in the ecm but it was able to keep up the fuel demand all the way to 6800 without air fuel dropping off.

well I've done two different camaro build up using their programming. Both have worked perfect, I didn't ever have to send them back because they got it wrong. Very impressive on thier work. If you can have them dyno tune right there, that would be my choice, I am too far (idaho) to get there......
I am happy with them for sure!!

Thanks, I may try that..Just concerned about melting down my sons college fund On there site it looks like the chip adapter Moates sells!!