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Old 05-24-2013, 12:04 PM
neovvl neovvl is offline
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Default SR20 Transmission 5.1 Final Drive

MFactory is willing to make these final drive gears greater than the current 4.785 they offer.

These 5.1 would be great I tested the 4.785 but I feel I could still benefit from a bigger like the 5.1 on the tracks I run as I bet many of you would do too.

In a 7,500rpm rev limit the car would still push 135mph in 5th gear

And in a VE like me with a 9,000rpm would push 160mph on 5th

What I want say is that the cars will still make good high mph with the short final
and have a killer tranny ratio for the infield.

We need 3 more in order to get this done.
If anyone is interested contact me at neovvl at gmail dot com.
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Old 05-24-2013, 12:06 PM
Matt93SE Matt93SE is offline
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You would be much better off keeping the existing final drives and getting a close ratio transmission..
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Old 05-24-2013, 12:24 PM
neovvl neovvl is offline
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The problem is that there are categories like IT-A and Autocross you can not modify the Gears.

and other than that some PAR Gear Ratios would cost around $3,000 for a syncromesh system.

and the Mfactory FD would cost around $580 + S&H
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Old 05-24-2013, 03:00 PM
Beejis60 Beejis60 is offline
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I put an Mfactory LSD in my K20 honduh. Good stuff, perfect fitment requiring no shimming at all.
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Old 06-05-2013, 06:45 PM
jr_ss jr_ss is offline
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Mfactory makes great quality items. Have you tried sr20forum?
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Old 06-05-2013, 08:44 PM
Matt93SE Matt93SE is offline
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Quote:
Originally Posted by neovvl View Post
The problem is that there are categories like IT-A and Autocross you can not modify the Gears.

and other than that some PAR Gear Ratios would cost around $3,000 for a syncromesh system.

and the Mfactory FD would cost around $580 + S&H
Those are all options. Depending on your goals with the car and race class, that may not be the best option though.
Lots of 4 and 5 spd dog boxes have a 1:1 top gear. Very few have overdrive.

The gearing in the stock boxes is really crappy in 2nd and 3rd gears. 2nd and 3rd are way too far apart, and both are too short for proper race use.

These trannies are also weak for racing use, and you don't want a synchro tranny for race-only use. You also don't want an overdrive due to the additional losses and stress on an overdriven gearset.

Driving a car with a 5.1 rear on the highway in the US would also be stupidsauce (average speed limits 65 to 80mph), so I can't imagine someone wanting to cruise at 4500rpm on the highway for hours on end to get to a track.

Thus, the people looking at these kinds of mods are probably not going to be dailiy driving their cars, and they would likely be looking for something better than the stock (crap) transmission with a shorter final drive.

I'd rather stick with the 3.9, 4.1, 4.3 final drives out there and run a 1:1 top gear.

For someone that is truly limited on transmission gearing like IT classes, then this is an option. However, a better option would be to swap to a better transmission with closer ratio gearing. It costs more up front, but you have better gearing and much better reliability than the stock tranny.

Just my opinion. It's worth what you paid for it.
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I don't care what color they are as long as they are LONG AND HARD.
'04 G35 Sedan 6MT- The DD
'96 240SX- The Track Toy
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  #7  
Old 07-10-2013, 12:18 PM
nissan rb25 run nissan rb25 run is offline
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hi can i ask this SR20 Transmission 5.1 Final Drive is for rear for nissan rigth if you didnt need any more let me ?? ring and pinion rigth ?? thanks
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Old 07-11-2013, 10:14 AM
RallyBob RallyBob is online now
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This is for the FWD chassis. We've got about ten of them ordered now.
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Old 07-11-2013, 11:57 AM
nissan rb25 run nissan rb25 run is offline
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its cool i think it for rear ok
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  #10  
Old 02-17-2014, 11:23 AM
Thatest Thatest is offline
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Could that same supplier be able to make final drive ratios for the GA16DE as they now will have a recalculated weight in ITB and could be weighting about 2290 Lbs making them much more competitive. How many sets(minimum) do they require, and what would the price be???
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