Mods and Consequences Triumph TR7
If ever there was a classic ripe for upgrades, it’s the last of the Triumph TRs
If you keep the TR7’s standard engine in place, it’s still worth upgrading’
The TR7’s poor reputation means that values have always been low and although they’re now creeping up, you still don’t need much to buy something really good. But if we’re realistic there was room for improvement in lots of areas, whether it’s the brakes, suspension, engine or interior, so the final TR is ripe for some upgrades, whether minor or major.
Over the years there have been some more extreme V8 upgrade packages offered, most notably by Grinnall Specialist Cars, while there was also a TR40 edition, inspired by the Ferrari F40 and produced by Eurosport. These come up from time to time if you fancy something ready to go, although the styling of both tends to polarise opinions.
Whereas originality is key for many classics, a Rover V8 conversion is almost expected where the TR7 is concerned. Over the years there have been numerous kits offered, some of which are better than others. These should include items such as an exchange subframe, V8 clutch assembly and housing, shortened propshaft, exchange rev counter, electric fuel pump and high-efficiency radiator.
Slot in a V8 and it also makes sense to fit a 3.08:1 diff in place of the standard TR7’s 3.9:1 unit; you’ll also need to use an SD1 five-speed gearbox. Some TR7s have a four-speed transmission while others have five gears; the latter is almost the same as the unit fitted to the 3.5-litre SD1 anyway.
If you convert a TR7 to V8 spec, you’ll have to uprate the suspension and brakes too; there are some details below for how to go about this. The bottom line is that if you keep the TR7’s standard engine in place it’s still worth upgrading the rest of the running gear, but if you choose to fit a V8 you’ll have to upgrade pretty much everything whether you like it or not.
Expect to pay at least £3000 for the parts to do everything yourself (some are now becoming scarce, such as the bellhousing for a five-speed gearbox) and if you’re buying a ready-built car, anything priced at under £5000 is probably going to need significant work.