Whoever said UDPs don't work? Got my best trap speed ever!!!
#1
Back in June I added a UDP and track tested it. I ran a 15.01@92.5mph. Conditions were pretty bad with temps in the 80s and humidity at over 90%. I felt the conditions weren't representitive of the conditions when I ran my best of a 14.7@93.93mph so it was hard to judge the gains of the UDP. Tonight, the weather was about as good has it been in quite a while. Temps were in the lower 70s with temps falling to the mid 60s when I left. The pressure was at 30.00 and humidity was in the 65-75% range. Unfortunately we were running into a 8-10mph headwind. The track is KCIR and is situated at 1000' above sea level. As you can tell, I'm a number guy.
My car hadn't felt very quick lately so I wasn't expecting much, but to have some fun. On my first run I got tons of wheelspin and ended up with a 14.93@95.08mph and 2.35 60 foot!!! Yikes, I got some topend!!! I thought it was a fluke and hot lapped another run. BAM!!! 14.91@95.51mph with another dismal 2.30 60 foot!!! I let the car cool down for 1/2 hour. I came back out and ran a 14.81@95.01mph with a 2.30 60 foot. This wasn't a fluke. All but one of my seven runs were below 95mph!!! I decided to experiment and not shift to 4th. This run netted me only 94mph. My 95.5mph trap speed is 1.5mph faster than I've ever gone. I was less than a tenth off my best et too which was in 20 degrees cooler and 50% humidity weather. I honestly feel that the UDP gave me the added topend and the added low rpm torque proved too much. I will have to learn to launch this car again. I am completely stoked. Staying in the 95mph range tells me I should be able to hit some 14.5s with traction, maybe a 14.4. It was nuts. I was trapping out as fast as many of the 30 modified Grand Prix GTPs (National Grand Prix meet in Kansas City).
My setup was 1/4 tank of 91 octane, no spare or jack, 26 psi in the front and 40 psi in the rear.
Dave
My car hadn't felt very quick lately so I wasn't expecting much, but to have some fun. On my first run I got tons of wheelspin and ended up with a 14.93@95.08mph and 2.35 60 foot!!! Yikes, I got some topend!!! I thought it was a fluke and hot lapped another run. BAM!!! 14.91@95.51mph with another dismal 2.30 60 foot!!! I let the car cool down for 1/2 hour. I came back out and ran a 14.81@95.01mph with a 2.30 60 foot. This wasn't a fluke. All but one of my seven runs were below 95mph!!! I decided to experiment and not shift to 4th. This run netted me only 94mph. My 95.5mph trap speed is 1.5mph faster than I've ever gone. I was less than a tenth off my best et too which was in 20 degrees cooler and 50% humidity weather. I honestly feel that the UDP gave me the added topend and the added low rpm torque proved too much. I will have to learn to launch this car again. I am completely stoked. Staying in the 95mph range tells me I should be able to hit some 14.5s with traction, maybe a 14.4. It was nuts. I was trapping out as fast as many of the 30 modified Grand Prix GTPs (National Grand Prix meet in Kansas City).
My setup was 1/4 tank of 91 octane, no spare or jack, 26 psi in the front and 40 psi in the rear.
Dave
#4
this is probably a stupid question, but here goes. i've heard a lot of people saying that they got faster times with a udp but the case seems only with the stick shifts. i know what the udp does, but does it really help the automagics? if it does, i know what my next mod is
#6
Originally posted by Cumalot
Do you what was the fastest GTP there ran? Btw, nice runs.
Do you what was the fastest GTP there ran? Btw, nice runs.
Two Vipers were there running consistent 12.5s, two Supras running 11.7s-12.5s, and a ZO6 running 13.0s.
Dave
#7
Originally posted by La Jolla Max
Apparently it yields ~6hp and 10lb-ft gain for sticks. It doesn't help quite as much for autos.
Apparently it yields ~6hp and 10lb-ft gain for sticks. It doesn't help quite as much for autos.
#8
Originally posted by got rice?
I keep reading that it doesn't 'help' much for the autos but I never see any data (ie dyno) to back this up. Anyone have a dyno chart?
I keep reading that it doesn't 'help' much for the autos but I never see any data (ie dyno) to back this up. Anyone have a dyno chart?
#12
Awesome runs, Dave! I'm still waiting for that cold front to make it down this way (central Fl.) so I can go back to the track to test my UDP. My dyno showed some decent gains with the pulley, so I want to see if it helps my track times.
It should start cooling off by next month if we're lucky.
Terry
__________________________________________________ ________
98 SE/ 5 speed/ CAI/ UDP/ Stillen Y pipe/ RT cat/ Courtesy B pipe/ Stock muffler
FSTB/RSB/ Clear front bumper lenses/ Clear tails
14.73 @94.1
It should start cooling off by next month if we're lucky.
Terry
__________________________________________________ ________
98 SE/ 5 speed/ CAI/ UDP/ Stillen Y pipe/ RT cat/ Courtesy B pipe/ Stock muffler
FSTB/RSB/ Clear front bumper lenses/ Clear tails
14.73 @94.1
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