What engine have you?

My 4.6 will tootal along at 800 rpm and pull cleanly to max.

Have you the classic shunting at low revs associated with the 4.0s?

Anthony, you probably have the standard diff, there was a higher ratio option which I believe I have, (hence the paltry 12.5 1/4 mile ).

If it doesn't rain, I'll check mine later and see the differance.

Might just neeed setting up properly, who knows what chip upgrade you have?

I'll search the invoice out, prior owner did it.

my 400 too. It'll take 5th gear at 20 mph on the flat. That said, it's all she wrote at about 5000 rpm in any gear though.

[quote=jamesogt]So, I have a Boxster S and a Chimaera.

The TVR has recently had a full service and MOT etc and was given a great bill of health by the garage. My question is when driving in town where I would normally change from 2nd to 3rd at say 20 ish mph in the Porsche, the TVR seems to drive a lot better if I keep it at 2.5+rpm (Leave it in second and just let it rev a little higher). It has a slightly rough feel too it if I let it pull on very low revs. Where as the Boxster just tootles along.

Is this something that I could look in to in terms of it needing something doing or is it just that the two cars engines are very different?

Cheers

I had this problem on my 4.0 Chim. Read on a previous thread that changing the coolant temp sensor would help. Did this (Lucas part no SNB802) and low speed town driving much improved. Its a 2 min job and the part is about £12.

It's all of them, I think. My 500 used to stumble a little at lowish revs (about 1,800 rpm IIRC).

Yes, but in normal use you wouldn't use 5th gear unless cruising in the TVR (motorway or dual carriageway). IMO It would just be more restful to be at 2000 rpm cruising at motorway speed, not 3000.
I find myself on A roads cruising in traffic quite often these days. I noticed the difference last night on a 60 mile cruise down the A1 in the dreaded diesel Saab (averaging 52 mpg). I didn't buy a TVR for fuel economy, but a bit of same when not having grin enhancing fun wouldn't be such a bad thing, would it?

How many miles would you have to do to recoupe the cost of any change to the rear diff or Gearbox.
If you get 25mpg at the moment and you could get it to 30mpg, after mods, then that saves 4p per mile, so if the cost was £200, for the mods, then you have to do 5000 miles at 30mpg to get the cost back, so maybe over a couple of years you might recoupe the cost.

My 450 runs happily around town doing 30 in 4th gear and pulling smoothly away. The only time it didn't was when I was forced to put 95 octane in. It really didn't like that at all. Just wondered if you are using a good 98 octane - v-power or similar?