Fitted a JP Exhaust to my T350
Discussion
I'm more than a little happy with the results. Just had to tell somebody.
Did the work myself. The difficult bit was getting the splitter off, as the two of the bolts holding on the front edge had previously been "rounded". The rest was pretty straight forward. I now have a disproportionate sense of achievement (being a Software guy, I don't usually do hardware).
The JP Exhaust is definitely louder, but not uncomfortably so. It's a much deeper sound. There are loads of pops and bangs to be had on the overrun
. The big improvement is the the sound is now more consistent across the rev range and under load. The original exhaust was a bit boomy at around 2000rpm. It was also quite restrained under heavy acceleration. This is no longer the case. The car now sounds like I expect a TVR to sound.
For anyone thinking about changing ... go on, go on, go on.
Did the work myself. The difficult bit was getting the splitter off, as the two of the bolts holding on the front edge had previously been "rounded". The rest was pretty straight forward. I now have a disproportionate sense of achievement (being a Software guy, I don't usually do hardware).
The JP Exhaust is definitely louder, but not uncomfortably so. It's a much deeper sound. There are loads of pops and bangs to be had on the overrun
. The big improvement is the the sound is now more consistent across the rev range and under load. The original exhaust was a bit boomy at around 2000rpm. It was also quite restrained under heavy acceleration. This is no longer the case. The car now sounds like I expect a TVR to sound.For anyone thinking about changing ... go on, go on, go on.
Well done! To be honest, given the time it took me to change the rear badge on mine and fix the bonnet release cable, changing exhausts is a considerably bigger job than I'll be taking on.
On a more educational note, my standard exhaust (T350T) also booms at 2000rpm (which coincides nicely with the motorway speed limit in 5th!) but I'm not sure I've seen that commented on in other posts. I wonder if the T top cars have different harmonics than the fixed roof? I remember somebody else found their sport exhaust unbearable on a T350T and got laughed at by the coupe owners. I've only ever driven the T350T so couldn't comment, except to say that the boom is much much better with the roof panels out.
On a more educational note, my standard exhaust (T350T) also booms at 2000rpm (which coincides nicely with the motorway speed limit in 5th!) but I'm not sure I've seen that commented on in other posts. I wonder if the T top cars have different harmonics than the fixed roof? I remember somebody else found their sport exhaust unbearable on a T350T and got laughed at by the coupe owners. I've only ever driven the T350T so couldn't comment, except to say that the boom is much much better with the roof panels out.
Targarama said:
No booming here. The pipes run very close to the chassis - you've probably got something touching underneath.
I agree with Targarama on this. Looking underneath the car the pipes do run close to the chassis. Also, there is a mounting point at the back of the middle section which is a bit "Heath Robinson" - two bolts connected at right angles that then hook through a rubber mount. On my car this had slipped a bit, and the bolts were hanging off a metal part of the mount. I think this may have been contributing to the boominess.justin220 said:
How do you take the bottom diffuser part off?
There are 3 allen bolts (M6 I think) across the top of the diffuser which you can access through the cheese holes. There are also a couple more, either side of the diffuser, which on my car don't appear to have any matching thread - they may have previously been stripped. Finally there are a couple of M6 nuts+bolts at the front edge of the diffuser, underneath the car. These were the most difficult to get out because of their position, and the fact that the nuts had previously been rounded off.Oh, also I should thank VARLEYHYD for his invaluable Sagaris pages. This gave me the info on jacking points and where to put the axle stands.
Edited by SteveO... on Thursday 2nd October 15:33
carl_rfc said:
if you dont mind me asking where did u get it from and how much did u pay?
ive only had a few 'booms' out of mine, mostly when sat at lights and give it a little rev
I got it through ACT. The price is on their web site - http://www.actproducts.co.uk/ive only had a few 'booms' out of mine, mostly when sat at lights and give it a little rev
My T350c with the standard exhaust was particularly "boomy" at 2000 revs in 4th and 5th but only up till 2300 revs when it disappeared, it was quite bad and you could feel the vibration through the floor and pedals. I spent alot of time trying to find the cause but when I changed the exhaust for a JP sport box the problem was much improved. My conclusion is that there must be a natural resonance at this particular rev range with the standard box and it is good to hear of others with the same issue which helps to build confidence that it is " TVR-normal" !
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