Theoretical top speed on a stock tranny?
#1
Theoretical top speed on a stock tranny?
Can someone do the math for me? What would the top speed be on a stock tranny with 315/18 R888's with a rev limit of 7800rpm.
1st gear 3.82
· 2nd gear 2.05
· 3rd gear 1.41
· 4th gear 1.12
· 5th gear 0.92
· 6th gear 0.75
· Final drive 3.44
1st gear 3.82
· 2nd gear 2.05
· 3rd gear 1.41
· 4th gear 1.12
· 5th gear 0.92
· 6th gear 0.75
· Final drive 3.44
#3
Thanks Joe, I was considering doing the tranny before the Mile to beat Colby's 224mph. But in this case, as long as she holds, I'll keep her stock until she starts to break.
#4
i went 231.7 at just under 7600 rpm FYI on stock trans with same wheel/tire setup.Just dont break it before TI, Tom will be upset.
#5
You can have 224, I won't need it anymore after March. I might actually put some tape on the car, get rid of mirrors, and disable the spoiler this time. That should be good for 230ish, I just need to stop watching Joe's moonroof delete DIY or I'm going to psyche myself out!
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
#6
You can have 224, I won't need it anymore after March. I might actually put some tape on the car, get rid of mirrors, and disable the spoiler this time. That should be good for 230ish, I just need to stop watching Joe's moonroof delete DIY or I'm going to psyche myself out!
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
#7
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#8
You can have 224, I won't need it anymore after March. I might actually put some tape on the car, get rid of mirrors, and disable the spoiler this time. That should be good for 230ish, I just need to stop watching Joe's moonroof delete DIY or I'm going to psyche myself out!
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
You can have 224, I won't need it anymore after March. I might actually put some tape on the car, get rid of mirrors, and disable the spoiler this time. That should be good for 230ish, I just need to stop watching Joe's moonroof delete DIY or I'm going to psyche myself out!
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
Seriously Joe, I've watched the video and am seriously impressed with your steering input after the change in cabin pressure. I don't know that people appreciate how important SLOW HANDS are at that point.
My last run in October, after we had done 224.8 - was interesting. The wind had picked up and was blowing from the side. Somewhere after the 3/4 mile mark (and after the 180 "wiggle"), I got hit by a crosswind and the car moved about 8-10 feet to one side. All I could think was two things - don't lift, and don't make a steering correction! I did neither, but the movement scrubbed a little over 1 MPH off of previous run.
At these speeds, aero has more to do with it than HP. That's what we're working on for March - we'll see how it goes.
Sorry Todd, didn't mean to hijack the thread. After looking at the gear ratios this morning and a value of 28" on Dia of tires - theoretical is 255. To illustrate how much tires count for, a Dia of 25" tops you out at 225!
Oh, you also need to be very concerned about "sack" diameter at these speeds.
#9
Here you go, now you can do the math your self any time you want. Imput all your parameters in all the boxes. The ones already there are just default items.
http://www.kenson.nu/ultima/930T.htm
http://www.gboxweb.com/gt2specs.html
http://www.kenson.nu/ultima/930T.htm
http://www.gboxweb.com/gt2specs.html
Last edited by Engine Guy; 12-31-2012 at 10:38 AM.
#10
do you have enough power to get to that rpm in that gear in 1 mile? you may go faster with a taller gear that keeps your engine in its peak power.
Joe,
I would think the light feeling you are talking about is "lift". And to further prove that point your sun roof was sucked out. There is plenty at play..
Joe,
I would think the light feeling you are talking about is "lift". And to further prove that point your sun roof was sucked out. There is plenty at play..
#11
Okay, stupid question for the experts but I've always wondered about this...
If you are running a staggered setup (65 in the front and 71 in the rear), approx 25.6" and 28". Which size do you use to determine the speed? The car is a GT2 so no concern about the diff (abs may be another issue, but I'll deal with that). Thanks.
If you are running a staggered setup (65 in the front and 71 in the rear), approx 25.6" and 28". Which size do you use to determine the speed? The car is a GT2 so no concern about the diff (abs may be another issue, but I'll deal with that). Thanks.
#12
I should have enough power now. Tranny will stay stock until I need to upgrade.
#13
This pic shows I'm at 173mph around 7000rpm in 5th gear. Stock tranny on 315/35/18 tires