MPH down...any ideas?
Thread Starter
Teching In
Joined: Mar 2010
Posts: 31
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From: Columbus, Ohio
MPH down...any ideas? Hit the track for the first time this past weekend in my new car, and definitely am not all that pleased compared to what most people say the car should run...
First off, 99 A4 Formula, 3.23 rear, only mod is a lid/filter, dyno tuned at 312whp/330wtq a week and a half ago.
Best time was 13.60 @ 102.6x I believe, with a 2.1x 60'. That was my first pass of the day and it didn't get any better from there.
Got my 60' down to a 2.04 but the MPH never hit 102.x again, ranged from 100.x to 101.x, no matter hot or cold. Ran about a dozen times, ET was 13.60-13.76...
Any ideas? Car has 85k on it, and I've only done fluid changes/brakes changes and the lid/filter since I bought it last month.
I thought I should be trapping like 105-108mph or so?....
Thanks in advance...
First off, 99 A4 Formula, 3.23 rear, only mod is a lid/filter, dyno tuned at 312whp/330wtq a week and a half ago.
Best time was 13.60 @ 102.6x I believe, with a 2.1x 60'. That was my first pass of the day and it didn't get any better from there.
Got my 60' down to a 2.04 but the MPH never hit 102.x again, ranged from 100.x to 101.x, no matter hot or cold. Ran about a dozen times, ET was 13.60-13.76...
Any ideas? Car has 85k on it, and I've only done fluid changes/brakes changes and the lid/filter since I bought it last month.
I thought I should be trapping like 105-108mph or so?....
Thanks in advance...
Last edited by P99Formula; May 8, 2010 at 11:57 PM.
Thread Starter
Teching In
Joined: Mar 2010
Posts: 31
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From: Columbus, Ohio
Thanks for your input though.
Thread Starter
Teching In
Joined: Mar 2010
Posts: 31
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From: Columbus, Ohio
And is DA density altitude? If so I believe it was around 1275 feet in the morning and 1815 feet in the afternoon around my last run?
I dunno, I just googled it and found this website, located my track/day I went...? http://www.dragtimes.com/da-density-...ect+ET+and+MPH
Thread Starter
Teching In
Joined: Mar 2010
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From: Columbus, Ohio
Ok, well it is what it is I guess...just gonna enjoy it now. A bunch of locals were telling me they ran 13.0-13.30s @ 106-108 stock like mine, so maybe they just had freaks.
Just had the car scanned, no knock whatsoever, no misses, or anything to mention, guess the cars running well.
One more question I had was about that website, dragtimes.com, it says to put in your et/trap speed and it will calculate a "corrected" time/speed, what is this? Is it saying that's what my car should run if DA wasn't an issue?
Thanks
Just had the car scanned, no knock whatsoever, no misses, or anything to mention, guess the cars running well.
One more question I had was about that website, dragtimes.com, it says to put in your et/trap speed and it will calculate a "corrected" time/speed, what is this? Is it saying that's what my car should run if DA wasn't an issue?
Thanks
Last edited by P99Formula; May 8, 2010 at 11:57 PM.
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Shift points can kill your mph, I've always felt the need for a bump in rpm's when my car was stock.
get those headers on and bump rev limiter to 6300 and shift at 6000.
my stock ls1 was shifting at 6300 with a 6500 rev limit ...full bolt-ons, loved it.
get those headers on and bump rev limiter to 6300 and shift at 6000.
my stock ls1 was shifting at 6300 with a 6500 rev limit ...full bolt-ons, loved it.
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Teching In
Joined: Mar 2010
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From: Columbus, Ohio
I'll ask my tuner to increase the shift points, what can the motor rev to safe stock? Like is 6500 safe?
Ok, will do. Will the headers/increased airflow move the powerband up a little or something? I guess I don't see the point in revving higher if you're actual hp/tq is decreasing as you increase revs?
I'll ask my tuner to increase the shift points, what can the motor rev to safe stock? Like is 6500 safe?
I'll ask my tuner to increase the shift points, what can the motor rev to safe stock? Like is 6500 safe?
Shift tuning is not done by asking your tuner, its done by going to the track and feeling it out, or just by bumping it up 100-200 rpms at a time and see where you get.
My girlfriends 99 car short shifted bad on the 1-2 shift, like 5600 even on a stock motor this felt bad to me. We had it tuned and I told the guy to bump it all up 200 rpms,.....it feels better now.
on my car I've made about 10 changes to shift timing, its about right now but my car is heads cam stall, etc.
Ok, will do. Will the headers/increased airflow move the powerband up a little or something? I guess I don't see the point in revving higher if you're actual hp/tq is decreasing as you increase revs?
I'll ask my tuner to increase the shift points, what can the motor rev to safe stock? Like is 6500 safe?
I'll ask my tuner to increase the shift points, what can the motor rev to safe stock? Like is 6500 safe?
not saying you cannot pop these motors, but they are very tough is taken care of. These motors like to drink oil out of the pcv so make sure to check oil often
Cars tend to run slower in shitty weather, about a tenth for every 1k Feet, humidity also kills times.. your corrected time is in good weather.. so its running where it should, stock shift points come at 6k.. I don't know why yours was lowered, you have a few tenths left there.
Thread Starter
Teching In
Joined: Mar 2010
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From: Columbus, Ohio
Did a tune up on the car last night, plugs/wires/pcv/fuel filter, gonna get a 160tstat this week then hit the dyno again. Also probably going to raise the shift points to 58/5900 as according to my dyno sheet power is still above 300whp at 6k...
Another thing that didn't help is I had a FULL tank of gas when I went to the track, so I'm sure that's another hundred pounds I didn't need, but hopefully next week is better.
Thanks
Matt
Another thing that didn't help is I had a FULL tank of gas when I went to the track, so I'm sure that's another hundred pounds I didn't need, but hopefully next week is better.
Thanks
Matt
Did a tune up on the car last night, plugs/wires/pcv/fuel filter, gonna get a 160tstat this week then hit the dyno again. Also probably going to raise the shift points to 58/5900 as according to my dyno sheet power is still above 300whp at 6k...
Another thing that didn't help is I had a FULL tank of gas when I went to the track, so I'm sure that's another hundred pounds I didn't need, but hopefully next week is better.
Thanks
Matt
Another thing that didn't help is I had a FULL tank of gas when I went to the track, so I'm sure that's another hundred pounds I didn't need, but hopefully next week is better.
Thanks
Matt
