Discussion
Advice I was given was that removing the pre-cats liberates four or five horsepower and makes no significant difference to the noise. Not worth the trouble of doing it unless the exhaust is off for other reasons but no particular reason not to if you want. For the really keen among you, you can use the space left behind to fit a conical ring to improve torque. Yes it's been done on mine and no I can't say it's made a vast improvement, but every little helps.
GreenV8S said:
Advice I was given was that removing the pre-cats liberates four or five horsepower and makes no significant difference to the noise. Not worth the trouble of doing it unless the exhaust is off for other reasons but no particular reason not to if you want. For the really keen among you, you can use the space left behind to fit a conical ring to improve torque. Yes it's been done on mine and no I can't say it's made a vast improvement, but every little helps.
So how does that work then Peter??
GreenV8S said:
Advice I was given was that removing the pre-cats liberates four or five horsepower and makes no significant difference to the noise. Not worth the trouble of doing it unless the exhaust is off for other reasons but no particular reason not to if you want. For the really keen among you, you can use the space left behind to fit a conical ring to improve torque. Yes it's been done on mine and no I can't say it's made a vast improvement, but every little helps.
I had it done, liberated 1bhp
and about 10ft/lbs iirc, but the noise, was AWESOME. ALOT less intrusive in the cabin, less droney, ALOT more raspy / fire crackerly on the rear, with MASSIVE overrun crackle/pop/snap bang.. if i play the peddle right.
JamieBeeston said:
Advice I was given was that removing the pre-cats liberates four or five horsepower and makes no significant difference to the noise. Not worth the trouble of doing it unless the exhaust is off for other reasons but no particular reason not to if you want. For the really keen among you, you can use the space left behind to fit a conical ring to improve torque. Yes it's been done on mine and no I can't say it's made a vast improvement, but every little helps.
I had it done, liberated 1bhp
ALOT less intrusive in the cabin, less droney, ALOT more raspy / fire crackerly on the rear, with MASSIVE overrun crackle/pop/snap bang.. if i play the peddle right.
Jamie, as your system now has the longer primary pipes it will sound very different to just knocking the cats out.
The mod that Peter is talking about requires cutting the manifold open and welding in a cone / reducer replacing the Cat. this is the preferable to leaving an empty container, and most specialists can do this.
Tim
Just go my car back from Steve Howard with a new chip from TVR Power.
The pre-cat removal and other bits of work seemed to create some pinking when the engine was loaded up also it was hunting and jerking a bit around 1900-2200 rpm.
The new chip set for pre-cat removal has smoothed the entire car out.
The pre-cat removal and other bits of work seemed to create some pinking when the engine was loaded up also it was hunting and jerking a bit around 1900-2200 rpm.
The new chip set for pre-cat removal has smoothed the entire car out.
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