std chim - increase the fuel flow - any good?

[jakem]

Hi there,

Has anyone tried this so called power mod for the standard V8? The principal appears to be sound, but does it really work? Im thinking about trying it out on my 4.5

http://www.speedydelivery.co.uk/car-tuning-power/tvr-chimaera.shtml

Any ideas?
cheers
Jake

[shpub]

Save your money.

[GreenV8S]

Worse than useless, they are a fundamentally bad idea as well as being a waste of money.

[sjpalmer1]

Does nothing for a hot wire AFM, may help a little if you've got the old flapper type.

[Parrot of doom]

Max Power mod - best avoid.

[M@H]

The page before:

www.speedydelivery.co.uk/car-tuning-power/

should give you a clue.. ..apparently this very same device will give the very same effect on just about every car in the UK marketplace (see the list at the bottom of the page)

..its a 10p resistor anyway isn't it..?

[V8 Archie]

I thought most Rover V8's suffered more from air starvation at the top end anyway.

[redistributor]

It's already been said - avoid.

[tacoma]

V8 Archie said:

I thought most Rover V8's suffered more from air starvation at the top end anyway.

I read this the other day in another thread Archie, that the engine is starved of air particularly beyond 5000 rpm. Do any of you know if the ACT air induction kit (i think it is made up of a K&N filter and some smooth bore tubes) makes any difference? I have the filter, bought from Tim at ACT, but what about the rest?

m

[tahiti450]

tacoma said:

V8 Archie said: I thought most Rover V8's suffered more from air starvation at the top end anyway. Do any of you know if the ACT air induction kit makes any difference? I have the filter, bought from Tim at ACT, but what about the rest?

As has been said the RV8s main limitation to prodigious power delivery is its restricted breathing, due to the size and shape of the inlet ports and the fact that there is limited wall thickness in the ports - limiting the amount of opening up that can be done. The 500 heads and various other modified heads maximise the available port efficiency and valve size - which is also somewhat restricted due to combustion chamber shape and valve layout).
ACT are well respected in the RV8 tuning world and seem to produce quality products. Fitting the induction kit will optimise the air flow up to the plenum chamber, and modified inlet trumpets etc will improve things into the manifold, but the gains will be pretty limited since the real problem is in the heads.
AFAIAA, of the later TVR RV8s (400 / 450 / 500), only the 500 is fitted with modified heads as standard (essential to get any power benefit from the capacity increase at that level). Obviously there were BV / HC versions and the 430 engines which had various specs.
The botrtom line is that whilst there are gains to be made from induction kits, ECUs, injectors, ignition systems etc, unless you can get significantly more air into the engine (which means either less flow resistance (better heads) or increasing the compression ratio to increase the suck - or both)then peak power gains (as opposed to torque) will never be that impressive.

[M@H]

tahiti450 said:

[The botrtom line is that whilst there are gains to be made from induction kits, ECUs, injectors, ignition systems etc, unless you can get significantly more air into the engine (which means either less flow resistance (better heads) or increasing the compression ratio to increase the suck - or both)then peak power gains (as opposed to torque) will never be that impressive.

..would that therefore suggest that forced induction is the best option if one was after a chunk of BHP, rather than trying to modify the engine itself..?

[GreenV8S]

M@H said:

tahiti450 said: [The botrtom line is that whilst there are gains to be made from induction kits, ECUs, injectors, ignition systems etc, unless you can get significantly more air into the engine (which means either less flow resistance (better heads) or increasing the compression ratio to increase the suck - or both)then peak power gains (as opposed to torque) will never be that impressive. ..would that therefore suggest that forced induction is the best option if one was after a chunk of BHP, rather than trying to modify the engine itself..?

There are limits to what can be achieved with normally aspirated engines, but conventional tuning can increase the volumetric efficiency and hence torque by up to about 20%, and also move the torque curve further up the rev range to increase the peak power by more than that (at the expense of less mid range power). So there is some way to go from standard before you *have* to go to forced induction.

[M@H]

GreenV8S said:

...conventional tuning can increase the volumetric efficiency and hence torque by up to about 20%, and also move the torque curve further up the rev range to increase the peak power by more than that (at the expense of less mid range power). So there is some way to go from standard before you *have* to go to forced induction.

But you'd exhausted all the conventional routes aready huh Pete ?

What boost are you running with now..?