went to the 1320....some questions
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From: abingdon, maryland
went to the 1320....some questions
went to the 1/4 mile track to see what my baby will do. here are the numbers
11.6 @ 117.2 with a 1.72 60'. my question is when i launch her do i run it out in first gear to red line or should i shift sooner. if so when should i shift from 1st to 2nd.
other runs 12.2 @ 116
11.8 @ 116.4
it was 80 degs that day
thanks oh, single turbo t78 with stock ports. should my mph be higher? kevin
11.6 @ 117.2 with a 1.72 60'. my question is when i launch her do i run it out in first gear to red line or should i shift sooner. if so when should i shift from 1st to 2nd.
other runs 12.2 @ 116
11.8 @ 116.4
it was 80 degs that day
thanks oh, single turbo t78 with stock ports. should my mph be higher? kevin
Slow RX-7
Joined: Sep 2004
Posts: 1,715
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From: Virginia
Originally Posted by fd3virgin
went to the 1/4 mile track to see what my baby will do. here are the numbers
11.6 @ 117.2 with a 1.72 60'. my question is when i launch her do i run it out in first gear to red line or should i shift sooner. if so when should i shift from 1st to 2nd.
other runs 12.2 @ 116
11.8 @ 116.4
it was 80 degs that day
thanks oh, single turbo t78 with stock ports. should my mph be higher? kevin
11.6 @ 117.2 with a 1.72 60'. my question is when i launch her do i run it out in first gear to red line or should i shift sooner. if so when should i shift from 1st to 2nd.
other runs 12.2 @ 116
11.8 @ 116.4
it was 80 degs that day
thanks oh, single turbo t78 with stock ports. should my mph be higher? kevin
What PSI were you running?
twinturboteddy ws my idol
Joined: Feb 2003
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From: Elkton, MD
I don't know the T78 graph Kevin, but from what I have seen I believe that after 6800rpm the boost/engine has reached a point where it begins a decrease in 1st gear. My guess according to this would be to shift into second around 6800-7k rpm.
BOOOYAHHHH!
Joined: Feb 2004
Posts: 1,578
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From: Virginia Beach
what kind of rubber you running on those times?
My best answer to your question is..... whatever you run your best times with. Everyones car is going to perform somewhat differently depending on modification's done. You were at the track. You should of experimented
My best answer to your question is..... whatever you run your best times with. Everyones car is going to perform somewhat differently depending on modification's done. You were at the track. You should of experimented
i went up there, wanted to see you run, but got up there to late. Some random guy came up to me and started talking to me about my car, i had no idea who it was, he had a prelude and asked me if i still had my pettit(how the **** did he know i had a pettit ecu) then he said there was another black fd so he obviously knew what an FD was. the mystery remains....
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Ee / Cpe
Joined: Jan 2003
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From: Gaithersburg, MD / WVU
you could tell the best by looking at a dyno graph, You want to shift at a point which will keep you in the powerband when you hit second and have the least amount of lag possible. I think around 7800 is the ideal shift in my car, but then again my turbo is not the same as yours.
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From: Dallas, Texas
I would have to agree with transam, look at your dynograph and shift at peak power. If you shift at redline and you havent been making power for 1000rpm it will just be wasted time. When you do shift at peak power it should get you right bak into your powerband. Im definetly no expert (look at my post about my first time at the track) but this makes the most sense to me.
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From: Dayton, OH
Originally Posted by iron4jones
I would have to agree with transam, look at your dynograph and shift at peak power. If you shift at redline and you havent been making power for 1000rpm it will just be wasted time. When you do shift at peak power it should get you right bak into your powerband. Im definetly no expert (look at my post about my first time at the track) but this makes the most sense to me.
Originally Posted by jimlab
You don't shift at peak torque or at peak horsepower. You shift at the point at which torque at the axles (flywheel torque x transmission ratio x differential ratio x 0.85) in the current gear falls below what torque in the next higher gear would be. The result is something that looks like this.
https://www.rx7club.com/attachment.p...chmentid=73327
If the torque curve for the current gear crosses the line for the next higher gear you shift at that point (the last two data points are 7,500 and 8,000 rpm in this chart). If they don't cross (1st and 2nd gear, for example), you hold the gear to redline (8,000 rpm in this case). It's that simple.
https://www.rx7club.com/attachment.p...chmentid=73327
If the torque curve for the current gear crosses the line for the next higher gear you shift at that point (the last two data points are 7,500 and 8,000 rpm in this chart). If they don't cross (1st and 2nd gear, for example), you hold the gear to redline (8,000 rpm in this case). It's that simple.
Last edited by saxyman990; Jun 28, 2005 at 03:14 PM.
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From: abingdon, maryland
Originally Posted by saxyman990
NO! This has been posted so many times it's rediculous. For max acceleration you do NOT shift at peak power. You shift when the torque available at the rear wheels is more in the next gear than it is in the current gear. Jim had a great explanation in one of his threads (actually, he's probably posted this same explanation 20 times already, so I'll save him the trouble)
i still don't know when that is
that doesn't show up on the dyno graph. looking at the graph i kinda get an idea of when to shift but that's for a stock fd? thanks still helps a bit. kevin
I assume you could calculate what your torque values would be for any rpm in any gear as long as you had at least one dyno run. You would calculate this by using the gear ratio for each gear....if this for some reason is not valid you could just go to the dyno and perform runs in 1st, 2nd, 3rd, and 4th gears
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From: abingdon, maryland
haha,,, it does need a good wash, i want it back waxed too . hey ernie, when are you going up there with your fd? talked to a pro drag racer at work and he gave me some tips. it might not apply b/c i don't have a 1400lb drag car with driver with 900+plus horses. he qualified at 7.43 in kentucky. kvn
. hey ernie, when are you going up there with your fd? talked to a pro drag racer at work and he gave me some tips. it might not apply b/c i don't have a 1400lb drag car with driver with 900+plus horses. he qualified at 7.43 in kentucky. kvn
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