Recommendations/Sources for Stronger Transmission?

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Sep 25, 2008 | 05:59 AM

#11

Venomous S

Joined: Jan 2002

Posts: 5,069

Likes: 4

From: Barkhamsted

Quote:

Originally Posted by blackey,May 13 2008, 10:24 AM

From what I have seen you have a few options. The cheapest by far is to just get another AP2 transmission and change as needed. The AP2's went to better syncros (carbon), and a bit different gearing in 4th and 5th. You can pick the AP2 transmissions up for $750-1250. You could have the gearsets cryo'd, but I have not heard of anybody really building a better box. There has been a lot of talk lately of bolting up other transmisisons, but the proof is in the pudding so to speak. I haven't seen pictures.

When you get to the point that that just doesn't work:

1. PPG
http://www.ppgearbox.com.au/products.htm#5
They have a new set of syncro gears. From what I have heard they are much stronger, but look to spend upwards of $5200US on the set.

2. The FranaGroup
http://www.thefranagroup.com/johncfr...nversions.html
This is a complete dog box setup for gears 1-4. It is much stronger, but it's a dog box, so street driveability is not so good. Runs about 6K in parts. Only covers 1-4.

3. DMMR
http://www.dmrr.net/transmission.htm
Lots of options here. They sell a bell housing and clutch that mate up to a Ford Sierra bolt pattern. This gives you a lot of options. Anything from a standard Ford Sierra gearbox to a strengthened Quaife full sequential. The bell housing is 295 Pounds, and the flywheel is 340 Pounds. The clutch used is a Quartermaster, so figure $500-$1500US depending on what you choose. Gearboxes range from $2000 to $15000US

4. Hollinger, Quaife, etc...

I was curious and contacted DMRR this is what they said:

Hi, the only gearbox which will fix most of your problems is a Sellholm MPG,
> sequential unit. I have one in my own rally car and clutchless changes are
> not a problem, either going up or down the box!
> They are used in european rallycross cars which make over 600bhp and have a
> 4 wheel drive system attached.
> The only problem I can see with ANY gearbox capable of handling this type of
> power is, it is going to be a lot more noisy than a standard "helical" type
> OEM transmission. But with this type of power you really don't have too many
> options..........We have a bellhousing which will bolt this gearbox to your
> engine, but you could not use the standard type clutch.......but with that
> amount of power you will probably have changed that anyway.
> Have a look at our web site for pistures of my car and info on the box.
> Thanks for your enquiry.
> Regards, Des.

2.26/2.06
1.58
1.22/1.33
1.04/1.13
.98/.89/.72

Drop gear options which go in the front of the box and multiply each gear are as follows:-
.96
1.04
1.13
1.22
1.33
1.45

The gearshift lever mounts where you can reach it, and has a flat plate to bolt to your transmission tunnell. There are 2 roseointed rods which attach the lever to the back of the gearbox via a 90o rocker. Look at the pictures of my car on our website www.dmrr.net

Its best to use the clutch when going slowly, but there is no problem driving in normal street traffic.

A twin disc set up is the normal type of clutch for high power applications. We recommend Quarter Master and have a flywheel available for this engine to accept a 71/4" set up.

Gearbox, complete with gear display, gearlever and all associated parts is