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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 05-27-2006, 10:03 PM   #11
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hmmm... thats weard compared to my car. In my car you hit WOT and it locks at 12* of timing and doesn't see anything else. I have never seen anything higher at WOT. I'm guessing that is max timing setup for a stock '92 chip. I'd like to bump that timing up to 15*-18* but we will see how that goes.
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Old 05-28-2006, 11:40 AM   #12
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I don't remember what the max timing I saw in the 93 was pre-jet, but owning a 93 and a 95 has taught me that there are some MAJOR diffeences between the PCM'*.
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Old 05-29-2006, 03:32 PM   #13
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Quote:
Originally Posted by willwren
I don't remember what the max timing I saw in the 93 was pre-jet, but owning a 93 and a 95 has taught me that there are some MAJOR diffeences between the PCM'*.
Could you share those major differences so others could know the exact differences.
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Old 05-30-2006, 12:34 AM   #14
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I have a shady mental list of them that I had in my noggin some weeks ago while investigating the possibility of converting a hybrid 94/95 to a 93 PCM, and don't recall all the specifics without digging through the FSM'* again, but I'll give you a big one:

How does the 95 L67 (and 94) PCM manage to deliver fuel efficiently with a 2.7bar regulator when the 92/93 do it with a 3.0bar? Despite the top end of the 94/95 flowing more because of the increased diameter of the throttle body?

I learned this one the hard way. The 94/95 PCM'* manage the duty cycle of the injectors (which are the same from 92-95) in a totally different way, and it'* not called out specifically in the FSM'*. The only way to characterize it is to put an oscilloscope on both of them. It'* not worth my time at this point since I solved the problem on my Gen3 conversion.

Interesting thought, eh? The higher-flowing top end of a 94 or 95 uses a lower fuel pressure.
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Old 06-01-2006, 07:23 PM   #15
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Ok, I've been thinking (and wondering if I'm crazy), and I'm thinking that as the car is, running 0 KR in that heat (about as extreme as it gets hear during the summer (save 10 days of 90*+) I'm curious if I would be safe to try a 2.4" or even a 2.3" pulley?
Only thing that'* giving me the jitters about that thought is the fuel system which is ok where it'* at, but any further?????
I'm having a new (slightly used IIMCO High Flow) muffler put in on Saturday morning with my tips and I would at least get a new FPR before the smaller pulley (and fix the exhaust leak at the manifold/head).
I've also switched over to NGK TR6'* (.054") since the scan, from the 2 month old NGK TR55'* (.057") and the car is definitely liking them (more throttle response, and definitely more power).
I'm hoping to get Andrews old custom burnt E-prom (from Nytro67'* old 95) tonight to use while I get my e-prom programmed to my car, and while I have Andrew'* E-prom I'll scan it again and get some good reading to see exactly what is different from my BKZZ prom.

So what is your take on this guys? Do I dare do the 2.4" or even consider the 2.3" before I do my fuel pump and balance the injectors? Or do I give it a shot (I would definitely use a scanner the the first few times I lay into it to make sure I don't have issues with it)?
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Old 06-01-2006, 07:30 PM   #16
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I think you're out of your mind for a 2.3....

2.4 You would still need some work done, but the fuel system is the least of your worries.
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Old 06-01-2006, 07:34 PM   #17
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Check Your fuel pressure. I think with the ported EM you can run a 2.4. I think the Fuel trims are also relevant in this. But I will let Pro handle that part of the conversation.
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Old 06-01-2006, 07:36 PM   #18
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I would recommend in the least, going to a FWI..........

Remember your intake temps last weekend? That'* asking for KR to go to a 2.4"....
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Old 06-01-2006, 08:06 PM   #19
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If your getting a Chip made up add some more timing and keep the boost the same. What kind of boost are you seeing? I'd try to keep boost at 12 and lower. Timing is free HP while a smaller pulley (more boost) is not. Keep the smaller pulley for the track... If you have any doubt in your mind about a smaller pulley and KR race gas is going to be your friend.

As for the chip keep on adding one degree of timing until you see KR and then back off one or two degrees. You should be golden then!
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Old 06-01-2006, 08:12 PM   #20
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Make sure your KR scans are done fully heatsoaked on a hot day of at least 90 outside temp. Don't make any further plans until you know this. You may be ok with a 2.4", but that remains to be seen.

I'm running a 2.2", but I believe it'* killing me in heat (or at least cancelling the gains I would have otherwise had), even though I have no KR. My plan is to probably end up at a 2.3" or even 2.4". Whichever gives me the most power with the least heat.
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