Gtech vs Reality (track)....again VERIFIED....new data! - 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 07-28-2004, 03:38 PM   #21
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Interesting comparisons. I like the graphs.
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Old 07-28-2004, 03:53 PM   #22
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Notice the difference between the 2nd gear shifts from the first two runs yesterday (hot) and the 2nd two this morning (cold)?

Quite obvious.
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Old 07-29-2004, 02:08 AM   #23
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A whole tenth of a G.

You were getting better 60 ' times at the track.
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Old 07-29-2004, 11:17 AM   #24
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Cold crappy launches, and no sticky stuff with the Gtech. With a better 60', I should be able to nail high 14'* consistently now.
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Old 07-29-2004, 11:46 AM   #25
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Quote:
Originally Posted by willwren
Notice the difference between the 2nd gear shifts from the first two runs yesterday (hot) and the 2nd two this morning (cold)?

Quite obvious.
So your tranny problem is coming into play as well, then?
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Old 07-29-2004, 11:57 AM   #26
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Cold shifts are brutal. By cold, I mean cold trans, has nothing to do with ambient air temp. Need to get the trans to 200F before the shifts smooth out.
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Old 07-29-2004, 12:01 PM   #27
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Quote:
Originally Posted by willwren
Cold shifts are brutal. By cold, I mean cold trans, has nothing to do with ambient air temp. Need to get the trans to 200F before the shifts smooth out.
Right. But is still shouldn't shift as brutally if everything was in working order?
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Old 07-29-2004, 12:03 PM   #28
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A new trans would solve my problems. jr's3800 has had the same prob on his 95 for about a year now. The problem is that I'm producing more torque than him, and my diff and the rest of the drivetrain is being hammered by those shifts. I'm fearing that something has to give.
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Old 07-30-2004, 01:07 AM   #29
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Default Temp/Humidity and Power

I think intake temps effect power - even without KR. Hence, you always need to factor this into comparision of acceleration times. The higher temps result in a less dense air charge, and hence less pontential power. Humidity further compounds this, as a given volume of air is not only less dense but more water vapor.

This is why cars run much better in cool dry weather, regardless of KR or even intercooling.A truly cold intake charge has more mass and less proposentity to detonate. Hence you get more power from both reduced kr/increased timing and denser air/fuel mixture.

An intercooler reduces the temp of the pressurized air from the blower - thus probability of detonation and KR at a given boost/octane level, but can not increase the mass of supercharger output. Our supercharger is also a positive displacement blower. Hence it also does not compress the air but pushes a fixed volumn of outside air into the engine. The boost pressure essentially messures the compression created at the intake manifold from forcing in additional air, not compression (density) of intake charge within the supercharger.

Nitrous actually works by creating a truly denser cool intake charge. The NO2 has a higher oxygen density than external air.
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Old 07-30-2004, 01:23 AM   #30
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Streetracer, your thoughts are right in line with mine, and every other performance minded 3800 owner. The problem with this is that I drive a Series 1. There are no intercooler options available at ANY cost.

This is why version 4 of my water injection is now going back into my car. I'm using it strictly for the intercooling effects. As I type this, my custom-fabbed (4th in two years) tank is doing a leak-down presssure test from 50psi. Tomorrow it goes to 150.
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