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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 06-18-2005, 04:44 PM   #21
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OR pushrods....


Just did some tests on the highway today..... but not with the G-Tech.... were I was there wasn't a flat piece of land for 100kms.

Anyways.....

From 4000 to 5500rpm (while in performance mode) I get a "groan", that stops when I shift.
It feels like from 100 to 140/160 is quickest in Performance Mode.... BUT 160-180 flys by in Normal Mode. Also I don't get the groan at all in Normal Mode.
I put the tranny in N while on the highway and revd her. No groan at all.
Infact.... not sure if this is right or not.... but I don't get any boost either..... only if I slam my foot down quick and hard, and the needle spikes up to maybe +5psi.... If I come onto it nice and easy.... the boost needle moves up and down a bit, but stays at -20psi.

Is any of that odd?
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Old 06-18-2005, 04:55 PM   #22
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Quote:
Originally Posted by Merlin 91/97
OR pushrods....


Just did some tests on the highway today..... but not with the G-Tech.... were I was there wasn't a flat piece of land for 100kms.

Anyways.....

From 4000 to 5500rpm (while in performance mode) I get a "groan", that stops when I shift.
It feels like from 100 to 140/160 is quickest in Performance Mode.... BUT 160-180 flys by in Normal Mode. Also I don't get the groan at all in Normal Mode.
I put the tranny in N while on the highway and revd her. No groan at all.
Infact.... not sure if this is right or not.... but I don't get any boost either..... only if I slam my foot down quick and hard, and the needle spikes up to maybe +5psi.... If I come onto it nice and easy.... the boost needle moves up and down a bit, but stays at -20psi.

Is any of that odd?
That groan is probably trans or diff related. I've found depending on outside temps, normal shift can be quicker than perf, as i get KR on the high end also. Shifting a little sooner avoids the KR. We're seeing the same effect there.

You should have no boost with a neutral or park rev. The PCM dumps boost unless you're in a drive gear. You're good there.
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Old 06-18-2005, 11:13 PM   #23
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I'll check the MAP sensor again next time I'm out.......

What is the code for fuel pressure? anyone else think this could cause boost stacking?
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Old 06-19-2005, 02:59 AM   #24
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I'm running a 3.2 pulley and my boost gauge is just barely hitting 10 psi......but then I am not running with a cat.
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Old 06-19-2005, 03:37 AM   #25
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Quote:
Originally Posted by 2000SilverBullet
I'm running a 3.2 pulley and my boost gauge is just barely hitting 10 psi......but then I am not running with a cat.
the cat shouldnt make a difference. Especially not a 6psi difference
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Old 06-19-2005, 11:49 AM   #26
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Quote:
Originally Posted by 2000SilverBullet
I'm running a 3.2 pulley and my boost gauge is just barely hitting 10 psi......but then I am not running with a cat.
FYI.... I was running 10psi w/o any mods.
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Old 06-19-2005, 12:27 PM   #27
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That'* gotta be an exhaust restriction (not likely any more) or a bad map sensor. I'd love to see a mechanical gauge hooked up to the system for a comparison.

Do a 'dry run' with the car in D, E-brake set, wheels blocked, left foot on brake, rev to 3000 rpm'* and record the boost reading. Then do the same with a mechanical gauge.
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Old 06-19-2005, 01:17 PM   #28
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Quote:
FYI.... I was running 10psi w/o any mods.
OK....so you gained 6 psi and I gained 3 psi with similar mods...minus the cat.


Quote:
Do a 'dry run' with the car in D, E-brake set, wheels blocked, left foot on brake, rev to 3000 rpm'* and record the boost reading. Then do the same with a mechanical gauge.
That'* called a burn out.

I have to hook up a mechanical gauge. These factory electronic gauges are not very accurate.
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Old 06-19-2005, 03:53 PM   #29
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Here'* the results from my 2nd scan.....

scan2.xls (in Excel Format)
FYI......the run doesn't actually start until cell 229.....

I took a few of the lines and calculated out the duty cycle for the injectors....
(PW x RPM / 1200)= Duty Cycle

Here'* a few calculations from my last scan....
20.48 x 5650 / 1200 = 96.42 (Top of 1st Gear)
20.94 x 5650 / 1200 = 98.59 (Top of 2nd Gear)
21.23 x 5904 / 1200 = 104.45 (Top of 2nd Gear)
22.11 x 4428 / 1200 = 81.58 (Middle of 3rd Gear)

So it clearly looks like the injectors are both maxed, and beyond their duty cycle.

I also noticed that the field "TG" (Transmission Gear) seemed to be "incorrect" when viewed against the RPM.
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Old 06-19-2005, 03:54 PM   #30
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How many pounds are the Series 2 injectors?
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