[TR] Euro or other taller differential needed

Jamie Palmer tr6driver at earthlink.net
Tue Sep 28 14:12:51 MDT 2010


RiffRAF Racing is in need of a TR6 differential with a taller rear end ratio (i.e. numerically smaller) than the stock 3.7:1 US setup.  One possibility would be the 3.45:1 from a PI car.  We're open to other suggestions, but since our car is supposed to be worth no more than $500 by the rules, some of the more common (for example, the GoodParts conversions) are out of our reach.

Anyone got a Euro diff around?

The car is at max RPM way early on straights.  For example, we were at the rev limit for the entire front straight at Roebling Road, and were actually driving the entire course in 4th gear.  Even at Sebring last weekend, when our engine was entirely off song, we could hit max RPM really quickly.

An overdrive would push the car past the race series value limit, and while taller tires would help, they would also hurt the handling considerably (we're currently using 205/50-15 Falken RT615K's on stock wheels due to treadwear rules and wheel cost rules).

All suggestions are appreciated...thanks.

Jamie Palmer
RiffRAF Racing
1975 TR6 ChumpCar


More information about the Triumphs mailing list