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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 05-07-2006, 02:26 AM   #21
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Get that pulley off of the car or find out why you have KR and solve it.
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Old 05-07-2006, 02:32 AM   #22
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Ok but considering I had 0 KR stock I don't see where I should start. I can't believe a pulley would cause that much. Where should I start?
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Old 05-07-2006, 02:35 AM   #23
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Vacuum leaks, exhaust leaks (very likely), running lean at the top end, etc.
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Old 05-07-2006, 03:08 AM   #24
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ok i just got back from running the car some more. The car makes 0 KR until it warms up then it only makes it part of the time. I'm thinking it might be a fuel related problem. I'm gonna check my fuel pressure next before removing the pulley
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Old 05-07-2006, 04:55 AM   #25
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Maybe some cooler plugs are also in order? Wouldn't that aid in killing KR?
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Old 05-07-2006, 10:36 AM   #26
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Maybe only one or two degrees. If you spike above 10, you have a SERIOUS problem. He hit 19.
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Old 05-07-2006, 11:24 PM   #27
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I think I might have some carbon build up on the valves. Tommorrow I'm gonna get some seafoam and see what all can be done before removing the pulley. I won't be driving it for awhile anyways so I might have time to fix it before removing it. Also I have a Jet Chip Stage 2 on order also. Is this gonna make my problems worse. Or maybe I should just use the Stage 2 chip with the factory pulley. Any opinions
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Old 05-08-2006, 09:02 AM   #28
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You are having the same problems as Matt, and he still hasn't figured it all out.

At this point, I'd suggest porting your Exhaust manifolds before putting that pulley OR chip in the car. The Chip will try to advance your timing further.

I don't fully understand why you and Matt have so much KR with a 2.2". I never did when I ran the old Gen2 setup on my 93.
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Old 05-08-2006, 10:32 AM   #29
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Do you think any of it has to do with the fact that I can only get 91 octane fuel?
Also what should my fuel pressure be testing at? I've never actually just put a gauge on it. All i've watched was my Tech tool which shows about 10.1AFR at full throttle. I was assuming this was good but now I'm not sure.
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Old 05-08-2006, 12:04 PM   #30
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The difference between 91 and 92 octane is probably less than 5 KR POTENTIAL, assuming your car is 'right on the edge' of KR to begin with. You had 19, and there'* no way in hell you're going to kill that with an octane change.

Factory spec on fuel pressure is very loose. It'* listed as 41-47 PSI. However, you should have a MINIMUM of 44-45 PSI at idle with the vac line disconnected on the FPR to support that much of a pulley change. This is from my experience on both my S1 L67'*. Your fuel pressure should be a MINIMUM of 41 psi with the ignition on, motor off. After ignition off, it shouldn't drop more than 1 or 2 PSI, and it should hold that pressure for a few minutes at least, without bleeding down.

You'll likely find multiple causes for your KR. I would bet you have low fuel pressure, cracked exhaust manifolds, and carbon buildup all contributing. Go after them one at a time.
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