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Sun Feb 06, 2022 9:03 am

You have to add that offset degrees to what you have in degrees change as suspension moves up and down.
Yes many have use longer, wider trailing arms and most have use free floating axles with no inner stops on them.
Others have relocated the transaxle rearward to decrease angle of axle to get more suspension travel.

Sun Feb 06, 2022 11:14 am

Did you line up the CV flanges straight across from each other and measure from the center of each flange? With your flanges not being straight across from each other, it would mean on the same plain as each other.
With this measurement, you subtract a 1/4 to 1/2in for correct axle length that you need to use.

Mon Feb 07, 2022 2:48 am

jsturtlebuggy wrote: You have to add that offset degrees to what you have in degrees change as suspension moves up and down.
Yes many have use longer, wider trailing arms and most have use free floating axles with no inner stops on them.
Others have relocated the transaxle rearward to decrease angle of axle to get more suspension travel.

Thanks, this is the info I started this thread for. It's something I've never seen mentioned on build threads.

Is there a rule of thumb for moving the transaxle? I'm happy to do the work, but I want to get it right first time. Is flanges inline considered the best option, or a slight offset?

Mon Feb 07, 2022 8:39 pm

The placement of transaxle flanges to stub axle there nothing set in place other the amount of degrees the CVs can be run at. Ideally for getting the most suspension travel up and down, flanges should be straight across from each other.
I had success with type 4 CVs with 1-1/2in offset and 10in of wheel travel.
This was with a 16in Empi axles.
Every setup is different. Mounting height of transaxle also can make a difference.
With the price difference of type 4 CVs and the Porsche 930s being so close it become easier to go with a 930 setup. With the 930s being able get more degrees of angle, it easier to have more offset between flanges and still get decent wheel travel.
I use the Empi 930 race CVs, they are extremely lose fitting. They will literally fall apart in your hand if holding them incorrectly. This is the kind of loose fit you need to have with a type 4 CV if you want to get the Most angle out of them.

Mon Feb 14, 2022 2:48 am

I've decided to take the plunge and move the transaxle back 2", will post an update with results once it's done.

Thu Dec 15, 2022 8:55 am

SOLVED

I moved my transaxle back 50mm and dropped the suspension slightly. It now runs quietly as it should and was definitely worth doing. Have modified the Buggy I'm building too so I won't have this problem when it's ready.

Thu Dec 15, 2022 2:27 pm

Good to hear fixed it.