this sounds exactly like some form of fuel/boost cut. I've seen it a lot with the EVO ECU's.

I have no idea about HP tuners so its kind of hard to explain but I'll give it a shot, what kind of resolution does your ECU software have?
anyway to tell what load cell/area you are in?
is it possible that much boost @ 5k puts you OFF the MAP (out of the range of your software) and the ECU just shuts down by closing the throttle?

from your dyno it looks like its happening @ peak TQ, which is when the cylinder pressure would be the highest, so you should be at the highest load point on your MAP.

 

My HPTuners table goes all teh way to 315KPA so unless he is running much more boost then he thinks, hes still on the map, and even when you run off the map on these ECU's it doesn't do that.

 

NO LUCK....

now off to install some hot coils.....

mitso off a denalli and/or 8.1ltr

 

Looking good on the project.

What kind of mufflers are those? I need some that have the inlet/outlet on the same end of the case, like those.

Thanks,

Jim

 

hey jim,

yeah they are s.s. magnaflow...not expensive either....approx 90 bucks each

 

no, i logged ECT pids and all look fine. so the pcm isnt closing it.

the map table is a two axis, RPM AND KPA. kpa goes to 315(3bar) so that isnt the issue.

 

So, I don't remember the answer to this question, but it is or is not going into reduced power mode?

If you want to send me a copy of your hpt file along with injector/fuel pressure specs and I'll look it over.

intmd-8@sbcglobal.net

 

no 1514....
jimmy did u see the vid?


thanks!

 

jim sent

 

 

I dont think spark is your issue, I ran 30psi on stock 98 c5 coils without a problem, made 1200rwhp. I did run into a problem with blowing the throttle body closed and kicking it in to pr mode. What Tbody are you running, i was running and L76 intake with GM tbody, at 20psi it would move the blade, pcm monitors ACC ped poss and TPS if they dont match, it goes to PR mode. I swiched to a TPIS sheetmetal intake and there Tbody and problem was solved. Sping was to week in the stock tbody. Im not sayin this is it but mine did the same thing at about the same power. Hope you solve it.

 

now that sounds like it could be happening! i have heard of the throttle blades moving under boost on other applictations.

Chris.

 

did you run stock lenght wires?
coils relocated so wires are long

thats what i thought origanilly, psi increased, rpms would drop but at the latest dyno date its doing at lower psi now. i cannot see the blade being closed at 7.5 psi.

i think that i am losing the crank signal, now i was told that if that was the case that i'd see a code right away. anyone suggest otherwise?

 

that is happening to me on a customers car... .its a 03 zo6 with kooks,corsa and a procharger on 8psi... made 603 but it keeps goin into reduced engine power.... its throwing a code i forget the exact one at the moment but it was something to do with the throttle blade....it doesnt do it everytime but most of the time it does....

 

that sounds like the ETC predicted airflow is what's getting you.

Unless nick has this code turned off, his seems like a different problem.

 

correct...

BTW even if it is turned off itll still show in the DIC
when u get that code u have to reset before running again not the case here.

 

Anything yet Nick? How small of a plug gap did you go down to? If the car runs around at 14.7 under normal driving you should have no issue running a NGK #8 at a .20 thou gap.

 

When I first read this post that was my very first thought. Check to make sure your crank sensor has the proper clearance. If too far from the reluctor ring it will miss fire. who knows if this is it or not. Just one of those things to check. Then you can rule it out if not...

Good luck,
Dave

 

what is the AFR during the run in the top when the pops hit??......sounded like a lean pop/blow-out....

 

Yeah I am running NGK#8 race .025 and I was 11.x AFR driving and mine actually held up (cruise AFR is fix now)