What options are still out there for a beefed up road racing tranny? I have always planned on using Gforces dogbox but now they have discontinued it, so I don't know which way to go. Does anyone make straight cut gears for the oem tranny for a reasonable price like Gforce did? I know there is one in Australia for the FD tranny but it goes for around 9k for just the gears.

 

You might as well just get the Jerico trans. You can pick up the four speed gear boxs for 3-4k (I think).. They're tough as hell and can handle high horsepower rotaries, plus these are the same transmissions that are being used in NASCAR. I'm going staight to the Jerico 5 speed.

 

The Jerico's are a nice unit for the track and the 4spd start around 4K. However, once you factor in misc. parts needed (yoke, shifter, torque arm, adapter plate, clutch with correct spline, etc) it addes another few thousand. I'd budget 7-8K for all new.

There are places which sell similar transmissions refurbished for alot less, like 2500. But they may not get the gearing you want exactly. All the install costs will add to that as well, of course.

-Andy

 

nascar uses richmond

 

Quaife makes a couple gear sets for the non-turbo / miata type transmission. It is "semi-helical" and retains the synchros.

Beyond that the only reasonable option I am aware of new are Jericho.

 

AWR sells the Quafie sets

http://store.awrracing.com/products/...tio-Set-2.html

 

This is here nor there, but...

Actually, the NASCAR COT Sprint Cup "spec" trans are all based on the Borg Warner T-10 design. Approved suppliers are Andrews, C&R, Emco, Jasper, Jerico, Tex, G-Force and Mid Valley. In fact the trannies are T-10 based in name only as they are mostly all clean sheet designs.

Richmond has a T-10 trans, but they are not an approved supplier.

To the OP, PPG is probably who you're thinking of doing the gearset for the FD trans. Pretty sure OS Gilken has a gearset too. Quaiffe has a dog-engaement 6-speed gearset for the R-type trans. As you already know though, all of those options are close to $10k.

Some of the drag racers are having good luck with having Liberty do a dog engagement (face plate) conversion on the stock FD trans.

 

He have a couple of E Prod RX7's in KC that run Jerico 4spds. These are the Ford Top-Loader based transmission that NASCAR used to run before the COT. When NASCAR did the switch to the COT these transmissions became cheap and you could always buy better gears from places like Hoerr racing (www.hrpworld.com).

The coolest one to have was a NASCAR Y2K qualifying transmission - back when a qualifying transmission was allowed in NASCAR. These transmissions have gun drilled shafts and narrowed/under-cut gears.

As others have mentioned, price in the car was in the $5-7K range but after that not much has to be done with them. Jerico used to sell an adapter and they can walk you through the pieces you need to run - bell housing, input shaft, etc.

This is the Y2K Qualifying trans that was in my friends car. Gear ratios are something like 1.8, 1.5, 1.2, 1.00

 

my friend has been running one in his 340rwhp miata for a couple of seasons, and its been good. the closer gears are NUTS on a turbo car too....

 

What is the reason for gun drilling the shafts? Lighter rotating mass? I'm assuming the undercut gears allow for quicker shifting at the expense of strength?

 

Lighter rotating weigh that is easier to accelerate and slow down. These transmissions were designed to survive behind an 800HP NASCAR engine for 2-3 laps only. Behind a street ported rotary a trans like this has no issues.

At one time NASCAR allowed the teams to set the cars up specifically for qualifying. So everything that would make the car faster was employed. A qualifying only transmission was one of the things they would do.

 

I talked about this a short time ago in another thread:
https://www.rx7club.com/race-car-tech-103/racing-transmissions-966778/

The basics seem to be the Jerico is the happy choice.
-Trent

 

Would there be any interest in developing a dual clutch transmission for our cars?

 

Sure all you need to do is find a non-profit organization the designs transmissions.

 

I'm thinking more along the lines of what the Supra guys are doing. Currently they've been working with Getrag on converting one of their dual-clutch transmissions to fit and mate to their cars. They come wither their own internal computers for switching so we wouldn't have to worry about mating it to our ecu other than the rpm output.

 

This transmission for the Rx8 by Quaife looks pretty damn nice, I'm sure they have one for the FD also

 

I was looking into this also, but seeaing as how I plan on putting in a stronger trans for only about $1500 I have come up with a few options I think will work.

First is the GM Muncie 4 speed, they seem to have the same pilot bearing size so I don't think you would need a special pilot bushing, The ones to look for are the close ratio M21 or M22 trannys, M21's are a helical gear and can be found for about $600 used, the M22 or "rock crusher" has a semi helical gear like the quaife design and goes for about $900 used. the ratios in both M21 and M22 are :2.20: , 1.64:1, 1.28,:1 1:1. one good thing I really like about the muncie is that it was designed for a BB Chevy so u know it will handle the torque of a rotary. And you can buy an all new and even more durable M22 for $1600 unasembled or $1800 ready to install from : http://tbtrans.com/muncie_4_speed.htm#model

The second option I was considering is an 89-91 GM T5 from a V8 camaro, again the pilot bearing should be the same and it would have the closer ratio 2.95:1 gear set, but the only problem is the overdrive is too wide. so I would swap in a ford T5 mainshaft, tailhousing, and shift rods. so that I can install a .81 aftermarket overdrive. sold here :http://www.moderndriveline.com/Techn.../80gearset.htm , The only reason I would not start out with a production Ford T5 is that they had a much wider 3.35 gear set, So If you wanna build a T5 you would need a GM T5 for the gear set, and a junkyard Ford T5 for the mainshaft, tail housing and shift linkage. But like the Muncie If you want to go all new you can buy a 2.95 Ford T5 from summit for $1300 and just install the aftermarket 5th gear set in that, but if you use a Ford box you will need a new pilot bushing compared to being able ( I think) to use a stock pilot beating if you use a GM

 

Donovan,

Do you know if these Muncie and T5 trannys shift well at high RPMs? I've been told the Ford top loader does not. As mentioned in Trent's other thread you won't go wrong with a Jerico.

Guy

 

To be honest I am not sure how the muncie handles high RPM shifts, I would call tbtrans.com they seem to build a lot of them and they are the ones who told me what I would need to do as far as all the things to use a GM T5 with the aftermarket overdrive, so they seem to know their stuff. But I have heard the T5's tend to bend the shift forks, and I know you can buy stronger ones, but i can't remember where exactly, try 5speeds.com or moderndriveline.com

P.S. forgot to mention in the last post, some other good sites for muncie stuff are davids4speeds.com, riversidegear.com, and Autogear.net , Auto gear is the company that actually makes the stronger cases and all the aftermarket stuff for the muncie that all the other websites sell.

 

T-5's have issues with shaft spread after 400 rwhp. I grenaded 3rd in my G-force kitted T5. Your best options might be Richmond gearboxes, a T56 or a used Jerico. My next inline gearbox will be a Jerico. Great product, amazing service.

-Trent

 

So I lost second gear at the track this weekend.. and been asking around to see what other people are running in there high HP cars. A friend has used a R154 transmission from a MKIII supra on his 3 rotor drift car. The transmission lasted the whole year with the car putting down ~700hp. He broke 3 FD transmission at about 400hp (shattered 3rd gear) before swapping in the the R154.

I wanted to know if anyone has used the R154 on a road course with success? I figure if it lasted a year taking the abuse of clutch kicks for drifting, it should be fine for TT / Road racing.

 

The toyota tranny is very strong as you have seen yourself. i have seen several hi horsepower (700) cars here with the r154.

I run a jerico , but you do have to cut open your transmission tunnel to make it fit. It is a very wide transmission.

On the new racecar we are rebuilding we will run a transaxle.

 

The R154 is a good trans but I do believe they are very heavy. Maybe in the range of 115#'s. All though the extra weight would not be in a bad place.

 

Not related to a specific transmission but rather the bell housings.... Who in the aftermarket is making racing bell-housings for the rotary?