GRIFF 500 Exhaust
Discussion
Still after the holy grail for the Best Value/Power exhaust mod? Spoke to very helpful guy at RAVEN Motorsport today, He basically recommends the existing system as without spending thousands on making new manifold with equal length bores for each cylinder, removing the pre-cats and cat, you cant do much better. As for the mod of ripping the silencer to pieces(which he condones totally) as this loses about 15-30 ib's ft of torque. What he basically recommended was to keep pre-cats and cat as std, and change pipe work down to rear tailpipes, by removing silencer and adding two (cheery bomb style) silencer on each bank, this will still keep good backpressure and sound a whole lot better. Having done on the 21st May, so will report back with feedback.... TATA for now....
nah, my old griff had the silencers modified as described and sounded beautiful and was significantly quicker than almost all of the other Griffs along Duxford runway the year before last!
I had a couple of guys come up and asked what modificartions had been made to my engine, especially one guy with a 420 SEAC whom was gobsmacked.
Sounds a bit funny to chop up the stainless steel exhaust and then go welding in a couple of very cheapy (bright red) cherry bombs...???
Bennno
When i say cherry bombs, i dont mean the bright red mk1 escort style things. They are black and just Similar in shape to the old boy racer exhausts. But the guy at raven seemed pretty adament about the silencer mod, and aparently he's highly reguarded in the TVR community.But not having driven or seen a modded silencer car, cannot comment on performance or lack of it either way? But he did say say hes put alot of customers cars back to std silencer after bodged attempts etc. But will wait with baited breath until my mod is done. Cheers all...
Several different exhaust manifolds were tested on a dyno'd engine but didn't realy come back with anything conclusive one way of the other as the engine had to be adjusted and reset with each manifold (due to the engine spec they think).
I must admit that changing the exhaust (apart from the noise factor) to get more power is a bit of non-starter unless there has been something else done to the engine as well. TVR seem to have done a pretty good job with the standard design.
If you want more noise, change the exhaust. If you want more power, look to the engine first.
Steve
www.tvrbooks.co.uk
I must admit that changing the exhaust (apart from the noise factor) to get more power is a bit of non-starter unless there has been something else done to the engine as well. TVR seem to have done a pretty good job with the standard design.
If you want more noise, change the exhaust. If you want more power, look to the engine first.
Steve
www.tvrbooks.co.uk
quote:
Several different exhaust manifolds were tested on a dyno'd engine but didn't realy come back with anything conclusive one way of the other as the engine had to be adjusted and reset with each manifold (due to the engine spec they think).
I heard that all of the manifolds tested were way better than the standard TVR original.
To be absolutely fair, the tests that were done did not seem to be repeatable and this makes any type of comparison difficult. More to do with problems with the test setup I think that any other criticism. There was a plan to publish the results in Sprint but no-one seemed willing to be compared with the others and to be honest,I am not sure it would have been be a fair comparison or fair to the companies involved, especially as other before and after curves contradicted the results even more.
Steve
Steve
Steve
Steve
The conversion to my exhaust has been carried out.
The following elements were changed:
- smaller muffler (about half the size of the original)
- larger diameter pipes between the muffler and the end pipes (the ones pointing upwards)
The result is a "darker" sound, more aggressive, with about 7 dB increase.
The overall result is great without being too much. Highway travel is hardly changed, track admittance should still be o.k. since it now has the level of a 4.3
The following elements were changed:
- smaller muffler (about half the size of the original)
- larger diameter pipes between the muffler and the end pipes (the ones pointing upwards)
The result is a "darker" sound, more aggressive, with about 7 dB increase.
The overall result is great without being too much. Highway travel is hardly changed, track admittance should still be o.k. since it now has the level of a 4.3
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