Summit Racing underdrive?
07-06-2008, 11:15 AM
#23
I looked around at how much the new and used ones were going for and it was a little nuts. This is a high quality SFI approved 25% underdrive with good instructions on install, belts and bolt to take the guess-work out of it. Don't think anyone will be disappointed!
07-06-2008, 11:08 PM
#29
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When I tested the car for any negative changes, the only thing I noticed after driving for awhile is the volts dropped to 13.0 with everything on. Still acceptable, but I might bump the idle to 900 with the Predator to compensate. If I rev the idle to 900 with the pedal, The volt gauge moves past 13 volts. I notice no temp changes and I live in the desert. A/C and steering both seem the same as before. I won't know for sure what kind of gains it gave me until I can get to the track hopefully next weekend.
07-13-2008, 12:02 PM
#31
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I went to the track last night and got a few runs in to see if the UD pulley helped my times. Well, I think my expectations were a little too high because it didn't help me that much. I would say I maybe gained 3 hp. My best time was 14.149 at 7000+ DA before the pulley and my best time last night was 14.120 with similar DA and 60' but more humid. My mph was pretty much the same as well. I know this is not an accurate comparison, but I did expect better times. I guess being above 5000ft takes more hp away than I thought.
I think it's time for more major mods to make a real difference. I can say that all my small mods combined reduced my et about 4 tenths over stock.
I think it's time for more major mods to make a real difference. I can say that all my small mods combined reduced my et about 4 tenths over stock.
Last edited by jrcws6; 07-13-2008 at 12:19 PM.
07-22-2008, 04:14 AM
#37
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I went to the track last night and got a few runs in to see if the UD pulley helped my times. Well, I think my expectations were a little too high because it didn't help me that much. I would say I maybe gained 3 hp. My best time was 14.149 at 7000+ DA before the pulley and my best time last night was 14.120 with similar DA and 60' but more humid. My mph was pretty much the same as well. I know this is not an accurate comparison, but I did expect better times. I guess being above 5000ft takes more hp away than I thought.
I think it's time for more major mods to make a real difference. I can say that all my small mods combined reduced my et about 4 tenths over stock.
I think it's time for more major mods to make a real difference. I can say that all my small mods combined reduced my et about 4 tenths over stock.
Is it just me or should you be runnin at least half a second faster than that .....it was an automatic but in 01 my bro had a ram air and ran a 13.0 on street tires with an exhaust and tune.
07-22-2008, 10:17 AM
#38
So I'm considering buying one of these but it recommends 4 different belts. The last 2 appear to be the same exept for the price but the first 2 I'm guessing the ones for the A/C are different. Ones 37 and the others 40 which one do we need? And what the difference between the last 2?
07-22-2008, 10:29 AM
#39
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So I'm considering buying one of these but it recommends 4 different belts. The last 2 appear to be the same exept for the price but the first 2 I'm guessing the ones for the A/C are different. Ones 37 and the others 40 which one do we need? And what the difference between the last 2?
The other 2 belts that come up in the required parts are for the GTO i believe......
07-22-2008, 09:22 PM
#40
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Based on:
Temp: 72.7°
Humidity: 63%
Track Altitude: 5300 feet
Pressure: 29.91 in.
Density Altitude = 7634 feet ET
Uncorrected 14.12 @ 100.4 MPH
Corrected 12.55 @ 111.58 MPH