HSR won't pull to 6000 nor even 5600
07-06-2003, 09:30 PM
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Car: Iroc-Z
Engine: 355 AFR'd HSR
Transmission: 700R4
HSR won't pull to 6000 nor even 5600
So I have the Stealth Ram and all you guys are saying it pulls to 6000 rpm and more if you have the motor for it.
Going through my datalogs I see that the MAF readings are 242 g/sec at 5600 (highest reading at this RPM) and are all the way down to 176 at 6000 rpm. Is it just me or is that kinda WAY past peak horsepower. (Yes the car stops pulling after 5600).
Any thoughts?
Going through my datalogs I see that the MAF readings are 242 g/sec at 5600 (highest reading at this RPM) and are all the way down to 176 at 6000 rpm. Is it just me or is that kinda WAY past peak horsepower. (Yes the car stops pulling after 5600).
Any thoughts?
07-07-2003, 12:16 AM
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Car: Iroc-Z
Engine: 355 AFR'd HSR
Transmission: 700R4
Hold on lemme look at the datalogs.
Ok Injector bpw from 5200-6000 went from 8.53-5.39 so it doesn't look like I am out of injector... in first gear.
In 2nd gear it says its at 11.61ms BPW YIKES!
3rd gear looks fine... hmmmm
Anyway, MAF measurements peak at 5250...
On this run I got 4.50* of spark retard.
Spark knock starts at exactly 5650! Injector bpw there is 7.89ms.
So, I need to add fuel? or take out spark? If so... how do I add fuel? Or do I take out fuel?
I just wanna friggin hit a 12 in this car.
Help.
Edit:
Oh yeah, I am running a custom chip done by me. Um... The funny thing is that I remember when I first got my car back together The Fuel pressure was way low... like 34 psi with vac line attached. The injectors were 24# Accels so they were really like GM 26#'ers, I still had the programming for 22#'ers in the chip. AND I had the base timing set at 0. The car pulled all the way to 6000 before any spark knock showed up. But even then it was barely audible. Hmmm.... ARAP spark advance table is hellish.
Ok Injector bpw from 5200-6000 went from 8.53-5.39 so it doesn't look like I am out of injector... in first gear.
In 2nd gear it says its at 11.61ms BPW YIKES!
3rd gear looks fine... hmmmm
Anyway, MAF measurements peak at 5250...
On this run I got 4.50* of spark retard.
Spark knock starts at exactly 5650! Injector bpw there is 7.89ms.
So, I need to add fuel? or take out spark? If so... how do I add fuel? Or do I take out fuel?
I just wanna friggin hit a 12 in this car.
Help.Edit:
Oh yeah, I am running a custom chip done by me. Um... The funny thing is that I remember when I first got my car back together The Fuel pressure was way low... like 34 psi with vac line attached. The injectors were 24# Accels so they were really like GM 26#'ers, I still had the programming for 22#'ers in the chip. AND I had the base timing set at 0. The car pulled all the way to 6000 before any spark knock showed up. But even then it was barely audible. Hmmm.... ARAP spark advance table is hellish.
Last edited by RedIrocZ-28; 07-07-2003 at 12:46 AM.
07-07-2003, 04:47 PM
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Car: 1982 Z28
Engine: LS1
Transmission: T56
What does your PE fuel vs. RPM table look like? Sounds almost like it has negative numbers at the high rev locations, pulling fuel out.
Another thing to check is the air bellows between the throttle body and MAF...almost sounds like it may be collapsing.
Kinda looks like maybe the airflow is getting restricted at high revs, which is causing the ECM to pull fuel...
Another thing to check is the air bellows between the throttle body and MAF...almost sounds like it may be collapsing.
Kinda looks like maybe the airflow is getting restricted at high revs, which is causing the ECM to pull fuel...
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