Rebuilding my Series I S/C, HP estimates??? - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 05-23-2005, 04:15 PM   #21
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Jason, as I stated, Thunderchickens don't know the M62. An AFC is an expensive little toy. If there'* a way NOT to have to buy and mess with one, I'll find it. I'm not putting one on my car.

Blazin:

1. Don't know, but in between the 93 and S2 TB'*. Not a big difference.
2. Slightly larger to match the 94/95 TB. Dimensions coming per my request soon.
3. No other difference other than coating, and a higher VE as a result.
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Old 05-23-2005, 04:41 PM   #22
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Is 92/93 56mm and 94/95 close to 70mm? I'll take that difference. In fact, I did.

I'm not so sure there is a way to significantly increase the size of a TB without recalibrating the MAF signal one way or another. The PCM interperets the signal assuming a specific TB area. If that changes, it is thrown off. I've personally experienced it. Even using a 94 MAF calibrated for the larger opening, my car would not idle till I bumped the MAF signal up by three percent. Doesn't sound like much, but it shows the limited capacity of our PCM to adapt.
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Old 05-23-2005, 05:28 PM   #23
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Thanks willwren

Quote:
Originally Posted by jwikoff99
Is 92/93 56mm and 94/95 close to 70mm? I'll take that difference. In fact, I did.

I'm not so sure there is a way to significantly increase the size of a TB without recalibrating the MAF signal one way or another. The PCM interperets the signal assuming a specific TB area. If that changes, it is thrown off. I've personally experienced it. Even using a 94 MAF calibrated for the larger opening, my car would not idle till I bumped the MAF signal up by three percent. Doesn't sound like much, but it shows the limited capacity of our PCM to adapt.
70mm? the blade is 70 mm? That would make the inlet to the SC even bigger? Your sure? That bigger then a S2 L67 TB?
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Old 05-23-2005, 08:48 PM   #24
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That'* why I put a ? next to it. I don't specifically recall. But side by side the 94 was quite a bit bigger than the 92 I had in my hands.
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Old 05-23-2005, 10:10 PM   #25
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Wow, nice timing on the topic - I just got done doing a full writeup on the new '94 TB and SC I installed on mine.

First one correction though, the rockers I sell will fit the '92. I offer them in both 5/16 and 3/8 stud.

In anycase, I'm waiting for pictures to be developed but the '93 to '94 difference is very large. Much larger than I expected. Here are some numbers for now (big writeup with pics later)

1993 Throttle Body:
Intake O.D. - 3.37"
Intake I.D. - 3.02"
Output I.D. - 2.26"

1994 Throttle Body:
Intake O.D. - 3.65 (+.28")
Intake I.D. - 3.35" (+.33")
Output I.D. - 2.88" (+.62" That'* over half an inch!)

The supercharger is just as impressive with a difference of almost half an inch on the intake. Here'* an odd one though, the output on the '94 supercharger is actually a tiny bit smaller than the '93. The housing on the '94 is also much larger and so is the EGR intake. The taller housing caused a minor issue with injector seating, but I believe they're in there "ok" not "great" though. The EGR was fixed with some sealant and a fresh bolt.

Anyway, more later.
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Old 05-24-2005, 12:10 AM   #26
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In any event If I am increasing the air intake I will also need to increase the fuel in this ratio as well. Can they be modified enough for the increased fuel, or will I need to get larger injectors as well? I just want to say you guys have great info. So much more than when I had my first bonneville. There weren't many people around then.

P.*. I just got my video camera working again so when I have a minute, I will take a pic of my car. It' not much to look at right now, but the biggest word is potential!!!
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Old 05-24-2005, 12:12 AM   #27
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Stock injectors are fine. You may want a reconditioned set, however, depending on their current condition.
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Old 05-24-2005, 12:17 AM   #28
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Quote:
Originally Posted by willwren

You should also seriously consider updating the valve bodies in your 92 trans. They're seriously out of date and have gone through several revisions.

Your stock trans will NOT last long above 250 horsepower. Trust me Read my signature very carefully.
I just had my tranny redone. I looked at the valve body after I had it redone. My tranny guy said that he built the hell out of it though and he knows what I am doing with it, so I hope he did a good job.
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Old 05-24-2005, 12:17 AM   #29
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I don't even think it'* possible to mod enough to necessitate larger injectors on these cars?

Pretty much the way to go is OEM....Be nice to have them flow tested and matched
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Old 05-24-2005, 12:27 AM   #30
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Dr. Jay,
are you still considering doing a modification plate to put an m90 on the '92 manifold?
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