Tranny comparison DSM, EVO VIII, EVO IX and EVO MR
Jul 14, 2006, 09:57 PM
#16
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Is there any reason at all to get the 4.111 gear other than huge turbo, HIGH power HIGH speed runs or more sedate highway cruising? I can't imagine that the reduction in gearing advantage would be offset by more time in boost, other than 1st gear perhaps
edit- thanks also for the information. very helpful!
edit- thanks also for the information. very helpful!
Jul 14, 2006, 11:45 PM
#17
Originally Posted by Seranin
Is there any reason at all to get the 4.111 gear other than huge turbo, HIGH power HIGH speed runs or more sedate highway cruising? I can't imagine that the reduction in gearing advantage would be offset by more time in boost, other than 1st gear perhaps
edit- thanks also for the information. very helpful!
edit- thanks also for the information. very helpful!
The 4.111 final drive gear is for people trying to avoid shifting into 5th gear in the 1/4 mile without going to stratospheric RPM's in 4th gear.
For example, AMS is staying in 4th gear to the end, with a terminal volicity north of 170 mph, and if they are on the stock final drive ratio they must be spinning the motor north of 10,500 RPM to be running the traps they are.
Your options to avoid spinning the motor that high are to go to a 4.111 final drive, (drop RPM to around 9,500 for AMS) but that will make the car harder to launch especially with a big turbo.
Or you can go with a closer ratio for 4th and 5th by either using the JDM close ratio 5 speed (8,400 RPM for AMS's trap speed) or the 6 speed from the MR (8,900 RPM for AMS's trap speed) but either of those second two options would require you to make one more gear change to 5th gear in the 1/4 mile. It is a toss up to me what way would work better.... so far people are just pushing the motor to higher and higher RPM's in 4th to avoid the shift to 5th.
Keith
Jul 15, 2006, 04:29 AM
#18
Evolved Member
Originally Posted by Fourdoor
The 4.111 final drive gear is for people trying to avoid shifting into 5th gear in the 1/4 mile without going to stratospheric RPM's in 4th gear.
For example, AMS is staying in 4th gear to the end, with a terminal volicity north of 170 mph, and if they are on the stock final drive ratio they must be spinning the motor north of 10,500 RPM to be running the traps they are.
Your options to avoid spinning the motor that high are to go to a 4.111 final drive, (drop RPM to around 9,500 for AMS) but that will make the car harder to launch especially with a big turbo.
Or you can go with a closer ratio for 4th and 5th by either using the JDM close ratio 5 speed (8,400 RPM for AMS's trap speed) or the 6 speed from the MR (8,900 RPM for AMS's trap speed) but either of those second two options would require you to make one more gear change to 5th gear in the 1/4 mile. It is a toss up to me what way would work better.... so far people are just pushing the motor to higher and higher RPM's in 4th to avoid the shift to 5th.
Keith
For example, AMS is staying in 4th gear to the end, with a terminal volicity north of 170 mph, and if they are on the stock final drive ratio they must be spinning the motor north of 10,500 RPM to be running the traps they are.
Your options to avoid spinning the motor that high are to go to a 4.111 final drive, (drop RPM to around 9,500 for AMS) but that will make the car harder to launch especially with a big turbo.
Or you can go with a closer ratio for 4th and 5th by either using the JDM close ratio 5 speed (8,400 RPM for AMS's trap speed) or the 6 speed from the MR (8,900 RPM for AMS's trap speed) but either of those second two options would require you to make one more gear change to 5th gear in the 1/4 mile. It is a toss up to me what way would work better.... so far people are just pushing the motor to higher and higher RPM's in 4th to avoid the shift to 5th.
Keith
Jul 15, 2006, 07:54 PM
#19
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ahh...i wasn't looking at the Evo8 gear ratios... with the 9 there's no avoiding shifting to 5th i suppose (with high power levels). Is the MR gearing superior for drag racing then assuming that shift to 5th is unavoidable on the 5-speed (IX)?
Jul 15, 2006, 08:05 PM
#20
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Originally Posted by Seranin
ahh...i wasn't looking at the Evo8 gear ratios... with the 9 there's no avoiding shifting to 5th i suppose (with high power levels). Is the MR gearing superior for drag racing then assuming that shift to 5th is unavoidable on the 5-speed (IX)?
Jul 15, 2006, 08:33 PM
#21
Originally Posted by Ang Wen Yan
The best trans for drag racing is 5 spd from 03-05 EVO!!MR trans is proven to hurt trap and ET!!
Up to trapping around 110 mph the 6 speed has the advantage, then in car trapping between 110 and 125 the 5 speed has the advantage, above 125 either the close ratio JDM spec 5 speed or the 6 speed from the MR will have the advantage.
Keith
Jul 19, 2006, 10:33 PM
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Originally Posted by Fourdoor
Up to trapping around 110 mph the 6 speed has the advantage, then in car trapping between 110 and 125 the 5 speed has the advantage, above 125 either the close ratio JDM spec 5 speed or the 6 speed from the MR will have the advantage.
Keith
Keith
So, for a car that is going to be in the 11's, the superior transmission is going to be the 5 speed.
Jul 22, 2006, 05:44 PM
#23
Gearchart are useful tools, but do not consider the practical effects of the changes to your powerband caused by modifications. If you've substituted a turbo/manifold kit that does not get rolling until 4500+ (read "35R"), then you want to have a transmission configuration that will maximize your time in the powerband, and not be shifting out of it...
Jul 23, 2006, 02:57 PM
#24
Originally Posted by CO_VR4
Gearchart are useful tools, but do not consider the practical effects of the changes to your powerband caused by modifications. If you've substituted a turbo/manifold kit that does not get rolling until 4500+ (read "35R"), then you want to have a transmission configuration that will maximize your time in the powerband, and not be shifting out of it...
Keith
Jul 29, 2006, 04:05 PM
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Originally Posted by Gruppe-S
Don't forget the JDM close-ratio gear box!!
Originally Posted by Gruppe-S
I just got the JDM 4th/5th gear in today. The lower ratio 4/5 should hopefully drop 1/4 mile times by 0.2 sec.
Do both the USDM 5-spd. and the JDM 5-spd. trannies use the same synchros?
