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-   -   3.38 ratio diff (http://www.haynes.co.uk/forums/showthread.php?t=7312)

DaveyB 22nd October 2011 10:48 AM

3.38 ratio diff
 
Hi it's me again going on about diffs could someone tell me if a 7 inch 3.38 ratio diff would be all right for a Haynes roadster. That's if there is someone around who is not at Exeter. I will probally use a 1.6 pinto to a type 9 box
Thanks again
Daveyb

ozzy1 22nd October 2011 11:03 AM

3.38 would give you slow acceleration.
3.62 or 3.92 would be better.

DaveyB 22nd October 2011 10:23 PM

Thanks ozzy 1 just the reply I was hoping for.
DaveyB

twinturbo 23rd October 2011 10:18 AM

Normaly that ratio would be paired with an engine with much more torque than a 1.6 Pinto. You would not "sensibly" put the combination in a sierra as the engine would struggle. It may fell ok in the roadster.

However, you not going to have the power/torque combination to get the value out of that diff which is higher top speeds. And, realy, the roadster is not cut out for HIGH speeds and is more of a point to point acceleration and braking car.

TT

robo 23rd October 2011 11:46 AM

Have a play with this.
http://www.boosttown.com/gearbox_dif...calculator.php

TT`s right but dont go to far that way or it will drive you bonkers on a run.

Bob

twinturbo 23rd October 2011 01:06 PM

I once swapped a DOHC for a 2.9 in a sierra 4x4, keeping the DOHC 3.92 diffs. It was much more sprightly than with the 3.62's but 1st was kind of superfluous.

TT

DaveyB 23rd October 2011 08:40 PM

Thanks again for the info, someone has offered me a 1.6 pinto and so thought I would be going down this route using that engine, I have some drive shafts and no diff, have just been looking at diffs for push in shafts and been concerned that they may not fit I know of a 3.62 diff that will fit and I have seen a 3.92 but I,m not sure if that will fit, and not sure of which one to go for any suggestions. Hope I making some sense!
DaveyB

twinturbo 23rd October 2011 09:05 PM

3.92, to give the pinto a chance..

TT


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