GS400 Gear Ratios - Homework :)
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I was just curious how the GS400's gear ratio would compare against TT Supra's #'s. Assume the drag coefficient is the same and don't take into consideration anything else for now. Who would have the advantage on the highway and why (I'm in the dark in regards to this area)? What would be the optimal gear for me to run at? I also have the TRD LSD. Also asume stock wheel size. How about with 20's?
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--------------Supra TT (6Spd)------------GS400----
1st ---------- 3.827 / 3.724 --------?
2nd --------- 2.360 / 2.246 --------?
3rd ---------- 1.685 / 1.541 --------?
4th ---------- 1.312 / 1.205 --------?
5th ---------- 1.000 / 1.0000 -------?
6th ---------- .793 / 0.818 ----------?
Final -------- 3.266 -------------------?
Just doing my homework
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--------------Supra TT (6Spd)------------GS400----
1st ---------- 3.827 / 3.724 --------?
2nd --------- 2.360 / 2.246 --------?
3rd ---------- 1.685 / 1.541 --------?
4th ---------- 1.312 / 1.205 --------?
5th ---------- 1.000 / 1.0000 -------?
6th ---------- .793 / 0.818 ----------?
Final -------- 3.266 -------------------?
Last edited by Mariusz; 12-08-02 at 03:25 AM.
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Hey man If you are racing the same dude with the white Supra my money is on you but I bet he is gonna get alot more stuf done because he knows you are comming for him!!!!!
Just make sure you video this one TOO!!!!!!!
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Originally posted by GS400_PUSHER
Hey man If you are racing the same dude with the white Supra my money is on you but I bet he is gonna get alot more stuf done because he knows you are comming for him!!!!!
Just make sure you video this one TOO!!!!!!!
Hey man If you are racing the same dude with the white Supra my money is on you but I bet he is gonna get alot more stuf done because he knows you are comming for him!!!!!
![Big Grin](https://www.clublexus.com/forums/images/smilies/biggrin.gif)
![Wink](https://www.clublexus.com/forums/images/smilies/wink.gif)
--------------Supra TT (6Spd)------------GS400----
1st ---------- 3.827 / 3.724 --------3.357
2nd --------- 2.360 / 2.246 --------2.180
3rd ---------- 1.685 / 1.541 --------1.424
4th ---------- 1.312 / 1.205 --------1.000
5th ---------- 1.000 / 1.0000 -------0.753
6th ---------- .793 / 0.818 -----------------
Final -------- 3.266 -------------------3.266
Thanks Mr. Johnson. Now, how do I interpret these figures for a highway run?
Hey man If you are racing the same dude with the white Supra my money is on you but I bet he is gonna get alot more stuf done because he knows you are comming for him!!!!! Just make sure you video this one TOO!!!!!!!
Actually you are absolutely right. Lol. He went single (T61) since he knew the Lex was coming.
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Last edited by Mariusz; 12-08-02 at 05:21 PM.
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hey Mariusz, u got any Video's of ur car that I could check out, I been searchin all over and can't seem to find any of ur GS after the Twin turbos, I remember someone sayin that there is a recording of the car when u guys were doing a Dyno, anyone have it so they can post it up? thanks
ShOwGS
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Originally posted by ShowGSLuVv
hey Mariusz, u got any Video's of ur car that I could check out, I been searchin all over and can't seem to find any of ur GS after the Twin turbos, I remember someone sayin that there is a recording of the car when u guys were doing a Dyno, anyone have it so they can post it up? thanks
ShOwGS
hey Mariusz, u got any Video's of ur car that I could check out, I been searchin all over and can't seem to find any of ur GS after the Twin turbos, I remember someone sayin that there is a recording of the car when u guys were doing a Dyno, anyone have it so they can post it up? thanks
ShOwGS
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#9
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Originally posted by Mariusz
--------------Supra TT (6Spd)------------GS400----
1st ---------- 3.827 / 3.724 --------3.357
2nd --------- 2.360 / 2.246 --------2.180
3rd ---------- 1.685 / 1.541 --------1.424
4th ---------- 1.312 / 1.205 --------1.000
5th ---------- 1.000 / 1.0000 -------0.753
6th ---------- .793 / 0.818 -----------------
Final -------- 3.266 -------------------3.266
Thanks Mr. Johnson. Now, how do I interpret these figures for a highway run?
Lol. I'm just doing some homework so that I can see how much more HP I'm going to need in excess of 500RWHP.....
--------------Supra TT (6Spd)------------GS400----
1st ---------- 3.827 / 3.724 --------3.357
2nd --------- 2.360 / 2.246 --------2.180
3rd ---------- 1.685 / 1.541 --------1.424
4th ---------- 1.312 / 1.205 --------1.000
5th ---------- 1.000 / 1.0000 -------0.753
6th ---------- .793 / 0.818 -----------------
Final -------- 3.266 -------------------3.266
Thanks Mr. Johnson. Now, how do I interpret these figures for a highway run?
Lol. I'm just doing some homework so that I can see how much more HP I'm going to need in excess of 500RWHP.....
You then divide the weight by this number to find out your lbs vs torque ratio per gear.
example:
GS: 3.357(1st gear) x 3.724(RMM LSD) x 500rwtq(estimated average) = 6250 rwtq... 6250 / 4000lbs (vehicle weight) = 1.56 pounds of force to accelerate per pound of vechicle in 1st gear (the bigger the number the better).
Supra: 3.827 x 3.26 x 500rwtq (estimated average) = 6238 / 3800(estimated vehicle weight with driver) = 1.64 (advantage Supra in this estimate) both cars have MORE than enough force to lift the front tires off the ground provided they could get traction.
Do this for whatever gear(s) you will be running in. Obviously, the actual numbers must be known to accurately estimate any advantage and variables such as driver skill, response, traction, etc all come into play. Exercises such as these are most useful when trying to figure out WHY one car beat another that had MORE power.
Using the above numbers... 4th gear looks like this:
GS: 1.00 x 3.724 x 500 = 1862 / 4000 = 0.466
Supra: 1.00 x 3.26 x 500 = 1625 / 3800 = 0.428
Advantage GS!!!
Now, the Supra MAY have different gears, more or less power, more or less weight... the GS may have more power
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So, my suggestion... put on a REAL exhaust... run 15psi... make 600rwhp and 600rwtq... and post the videos
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Hey ther Mariusz,
Man this is getting interesting fast!! Can't wait to see how strong your car is. What are the differences/major upgrades over Lexciting's already one of a kind TT. I hate to admit it but I'm going to have to settle for last place in the Twin Turbo war of the GS400's!!
Man this is getting interesting fast!! Can't wait to see how strong your car is. What are the differences/major upgrades over Lexciting's already one of a kind TT. I hate to admit it but I'm going to have to settle for last place in the Twin Turbo war of the GS400's!!
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Originally posted by kensttgs400
Hey ther Mariusz,
Man this is getting interesting fast!! Can't wait to see how strong your car is. What are the differences/major upgrades over Lexciting's already one of a kind TT. I hate to admit it but I'm going to have to settle for last place in the Twin Turbo war of the GS400's!!
Hey ther Mariusz,
Man this is getting interesting fast!! Can't wait to see how strong your car is. What are the differences/major upgrades over Lexciting's already one of a kind TT. I hate to admit it but I'm going to have to settle for last place in the Twin Turbo war of the GS400's!!
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
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PS. The thing with the bottle is a joke for now. However, after I see the figures Mo and I agreed on, I will be talking to him about further development of the TT's potential.
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Last edited by Mariusz; 12-09-02 at 11:20 PM.
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jbrady, much thanks man. Can't believe i missed your post. Went back to see if anyone responded and saw it now. 600RWHP would be nice....wouldn't it?
As soon as I get used to 500rwhp+, I can almost guarantee you that you will see a 600rwhp+ GS with no nos! :eek: But I'm going to keep my mouth shut untill it happens. No point in bragging about HP figures if you don't have them
Also, I'm thinking twice now why I got that 3.26 gearing. Anyways, it might look different in practice so we'll see. ![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
PS. How would I estimate the average torque quickly and easily? Does the diameter of the wheel matter? Sorry for these dumb questions, but I rather ask then guess.
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PS. How would I estimate the average torque quickly and easily? Does the diameter of the wheel matter? Sorry for these dumb questions, but I rather ask then guess.
Last edited by Mariusz; 12-11-02 at 08:25 AM.
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Originally posted by Mariusz
PS. How would I estimate the average torque quickly and easily? Does the diameter of the wheel matter? Sorry for these dumb questions, but I rather ask then guess.
PS. How would I estimate the average torque quickly and easily? Does the diameter of the wheel matter? Sorry for these dumb questions, but I rather ask then guess.
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Originally posted by GS400_PUSHER
Oh yeah !!!!!!
Oh yeah !!!!!!
jbrady, isn't 4th gear in your example supposed to be:
Supra: 1.312 x 3.26 x 500 = 2139 / 3800 = 0.563
instead of:
Supra: 1.00 x 3.26 x 500 = 1625 / 3800 = 0.428
Advantage to the Supra instead of the GS
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Here is a little proggie I made (in C++) to calculate these ratios based on what you said. (Don't bash me on the size or the optimizations...lol....this was on the fly.) It kind of really makes me think about the 3.76 instead of the 3.26 for highway runs (won't need that advantage in 1st or 2nd as I will be smoking the tires anyhow)
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For the first time I can see why 3.76 is actually a better choice for a high HP Lexus and 3.26 for a stock GS.
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49K Zipped -> http://www.lexushp.com/gear.zip
Supra------GS400
3800lbs----3800lbs
500rwtq----500rwtq
3.266------3.76 (RMM LSD)
-----------------------
0.373---0.213
1.014---1.079
0.724---0.705
0.564---0.495
0.430---0.373
Supra------GS400
3800lbs----3800lbs
500rwtq----500rwtq
3.266------3.266 (Stock LSD)
-----------------------
0.373---0.185
1.014---0.937
0.724---0.612
0.564---0.430
0.430---0.324
PS. Also, which set of gear values should I be comparing for the supra.
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Last edited by Mariusz; 12-11-02 at 10:55 AM.
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