Dropped a pulley size today - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-30-2010, 05:58 PM   #11
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Quote:
Originally Posted by Danthurs View Post
Post up your function string, mines not working right, I'm wondering if I'm using the wrong PID
I dont have my laptop here, I will PM ya when I go and get it.
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Old 05-30-2010, 06:09 PM   #12
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No hurry. I set up a new PID, but it'* not displaying right. That might be because the scan file was not recorded using that PID.
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Old 06-01-2010, 09:00 AM   #13
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Would like to point out that w/o a caveat or two I disagree with most everything about dropping pulley size as mentioned. Being Dan though, we know he'* intercooled and takes necessary precautions....kinda. Not having the wideband is bad for this type of testing.

Pulley size is not something we should look at like ***** envy. The fastest guys and best tuners have proven out that added timing increases your power better than more boost. While Dan'* charger is ported and that helps a bit, the Gen 3 is little more than a heat pump when we pulley down to that level. Smaller pulley means the charger is moving faster and generating much more heat.

Dan... do you have an IR gun to get a temp off the outside of the blower? I'd be interested in how hot that puppy is getting.
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Old 06-01-2010, 09:07 AM   #14
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That is something I plan to get and will monitor it. My IC temps are a bit hotter when driving normal, between 5 and 10 degrees. I'm in agreement with Bill about pulley size. Smaller is not always better. You want your timing to be around 18*. If you there then pulley down. Also, a smaller pulley means more HP goes in to spinning the SC. If you do not have tuning software you should not be running a pulley this small. I monitor my engine very close. I have no plans of dropping any smaller even though my timing is still high. I'll add timing from this point.
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Old 06-01-2010, 10:10 AM   #15
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18* is good. I have heard/seen most guys say ideal for power to be at 21*, that is running at the top end and knowing everything about the engine and how it'* running.

I set my motor up on a 2.9" pulley, planned a 2.8" for daily driving once it was tuned and ready for it. In the box I have 2.5", 2.6", 2.7", 2.8" and a couple others. A friend gave me the 2.6" and 2.5", doubted I'd ever run them. On the Gen V a 3.4" is roughly equivalent to a 3.2" on a Gen 3, airwise. Since both chargers push the same amount of air, that'* the cooler efficiency gain. I can't quite imagine the 2.5" on a Gen V.
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Old 06-01-2010, 11:03 AM   #16
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My goal is always about 18*, once over 20* it seems your not gaining much. Had a GP with a 2.7 running 22* Just a observation but seems like we get very different results here as to pulley size and timing. Not real sure why, but I suspect because this area is only 700 feet above sea level.
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Old 06-01-2010, 12:08 PM   #17
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Made me look up my area. I'm at 134ft. You and I have some good dense air.
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Old 06-01-2010, 02:52 PM   #18
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That dense are really makes a difference.
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