Rear axle ideas for 300bhp

[owen]

I am after a narrow rear axle that can take 300ish bhp. The car is a 1950s standard ten which is around 700kg and currently has 150bhp pug 106gti engine in, this will be being turbocharged soon and although I am only aiming for 200-250bhp the engine can take upto 400bhp from what I have seen online. I can always make the arches wider on it if needed, I know of someone running 300bhp though a tr7 axle on one which is about 8inch too wide. Any ideas would be nice, nay even debate a fixed diff axle if it's an easy mount design

[Phil H]

How much torque? That’s what kills axles, not bhp.

I’ll wait for someone else to say a Scimitar axle..but that’s going to be way too wide.

[stealthstylz]

From a quick Google the TR7 axle appears to be 57" wide which would mean a Baby Atlas would be about right (48.5").

[Dez]

You need to be working to hard numbers. Width, pcd, etc.

Tell us what the critera are, then knowledge will come forth as to if what you’re looking for actually exists.

[owen]

Would be around 250 lbft, pcd I am not fussed about it stock is the same as triumph mgf and metro. I have seen 105e axles fitted without arch mods but I'm willing to alter the arches to suit.

[jikovron]

Something like an MGB axle would probably be the strongest part of your drive train and common to boot.
52" wide,3.9:1 ratio and a 4.5inch 4 stud PCD
Dolomite sprint axle weighs in with a 54"width, 3.45:1 ratio and the same 3.75inch 4 stud pattern.

Scimitar SE5 4HA is 54" wide, jag lsd options, 3.07/3.3 ratios as standard but many more are available, one drawback however is that they are massively heavy due to being the british twin of the dana 44 so may be abit hideous in a lightweight car as far as unsprung weight goes.
Hth in some manner

[tristanh]

What about a Volvo rear axle?

[Ritchie]

Oct 13, 2019 16:57:31 GMT Phil H said:

How much torque? That’s what kills axles, not bhp.

I’ll wait for someone else to say a Scimitar axle..but that’s going to be way too wide.

Traction needs to be taken into account aswell, narrower tyres will be much easier on it.

Baby Atlas or a narrowed Volvo job would be my choice.

[Simon998]

Tu5j4's like to bend rods when they're boosted too, the maxpeedingrods conrods aren't bad for the money as long as you don't use the chinese 'arp' bolts that come with them

[LowStandards]

I believe the MGB axle has been used under the Standard 8/10

It's the right width iirc


Pretty sure the Black one on here witht he Pinto in ran one?

[scimjim]

Oct 13, 2019 15:41:11 GMT owen said:

I know of someone running 300bhp though a tr7 axle on one which is about 8inch too wide.

The early TR7 axle was rubbish, so that must be the 5 speed version, which was straight out of the SD1 IIRC.

[owen]

Just brought an mgb axle for £50 in the same area I'm collecting the car from. Let the rebuild begin next month