Adey.
ClioSport Club Member
have you tried it and found out then?
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Adey.
ClioSport Club Member
ahh ok, didnt know if it had been tried and found to be of no benefit,tho on a boosted engine bigger ports and valves are a good thing arnt they?
Gaz_
ClioSport Club Member
Extreme mode
I even hear that Renault fit pistons the wrong way round.
Boobs?
To an extent, with boost you can use larger port volumes to a better effect as your not stuck with the laws of nature. However people tend to think that boost increases volumetric movement, where it rather increases density and typically velocity stays the same aswell. So you can get hung up on size.
Boost is a measurement of restriction so to flow the same mass through a straw you'd measure more positive relative pressure than if you were to flow the same through a toilet roll.
I even hear that Renault fit pistons the wrong way round.
Boobs?
Ok.....not boobs.
Well, i propose a breast size/body mass ratio max otherwise you just end up with a mooseknuckle.
Adey.
ClioSport Club Member
so wouldnt that mean with a bigger port and valve you could get the same amount of air in at a lower boost pressure than if you were using smaller ones?
thread hijack lol, should start another one up
thread hijack lol, should start another one up
Essentialy yes. Which is why comparing engines/power mainly on boost pressure is b****cks. I.e. "How much boost is it running mate"
Cheers
M
Yes, so long as we are looking at that part of the system as a single entity. Less restriction = less required 'boost' for the same amount of mass movement. Which means higher adiabatic efficiencyand a net result on higher density for a lower given boost.
BUT bigger also means slower (velocity) for the same peak figures, and velocity control is THE most important thing when it comes to port design. Lower velocity with bigger ports means less efficient cylinder filling.......so there are a lot of things to consider and you can end up chasing yourself with swings and roundabouts.
BUT bigger also means slower (velocity) for the same peak figures, and velocity control is THE most important thing when it comes to port design. Lower velocity with bigger ports means less efficient cylinder filling.......so there are a lot of things to consider and you can end up chasing yourself with swings and roundabouts.
LY 182
i dont think the throttle body is the restriction on the inlet side its the lower "bend" that would need a fair bit of sorting before the tb became a problem i reckon
If the standard throttle body flows sufficent for the power the engine is making then there is no point going bigger. All you'll do is effect tip in and make the car more difficult to drive as you'll achieve effective WOT at a much lower throttle opening meaning less throttle pedal travel for the same amount of power.
If the you can't tell a difference on the road or dyno between the last eigth of the throttle pedal travel then there is no point going bigger as it flows enough.
If you need more throttle area then you can look at modifications to the standard body i.e. going shaftless or countersinking the butterfly retaining screws and filling the heads. One of the most flow damaging components of a throttle body is the screw heads retaining the butterfly. You tend to be able to find a few % more flow with this which quite often can be easier than changing bodies etc. on road cars.
Cheers
M
M
mini-valver
The black one is on ITB's.
I do a good line in these:
From 200bhp to 285bhp. You need very, very deep pockets once over 235bhp though!
Cheers
M
ITB'd MK1
something along those lines
Larger TB works best in combination with raised compression, cams, and re-worked head and inletsEngine available from Sodemo to buy or lease. Its a WTCC S2000 spec engine package for the most part, supplied with ECU, wiring loom, airbox etc. etc. etc. straight drop into the front of a Clio Cup car. Max torque is still well within spec for the standard ST75 box and as its an MM ECU you can still retain the standard MM Clio Cup Dash if required.
Circa 260bhp available in mildly detuned endurance spec. 285bhp in touring car spec.
Sodemo are doing a lot with F4's at the moment, both NA and Turbo.
Cheers
M
If you mean the 140bhp/litre + ones then
- Sodemo specific cylinder head, valvetrain and cam profile,
- Steel rods
- Forged pistons, Sodemo specific C/R
- Specific crank
- Specific bearings
- ARP (as far as I can tell) fasteners throughout
- Sodemo specific induction system and exhaust manifold
- Semi Dry sump.
8500RPM rev limit as per S2000 regs.
Cheers
M
Thanks icarus
Sean, i've not used newman, but they have very good rep on vauxhalls,
Cat cams and shrick seem to be the favoured on clios
I had pipers in my gti, again very good for those as are kents but i remember reading kents ahd a propblem on williams?
i'd go 428's but as i said do your research into who you have fit them.
Sean, i've not used newman, but they have very good rep on vauxhalls,
Cat cams and shrick seem to be the favoured on clios
I had pipers in my gti, again very good for those as are kents but i remember reading kents ahd a propblem on williams?
i'd go 428's but as i said do your research into who you have fit them.
182
Hi sean, i've fitted schricks to my car, its no faster untill 5.5k rpm upwards, it depends how you drive your car to really benefit
theres a thread where i posted the results after the fitment, alot of other forum members with cams also contributed to the same thread on results.
you wont gain alot of peak power (i got 10bhp) put what power there is is sustained longer (at 7k rpm i was making 20bhp more) and in conjuction with a remap and raised limiter there are benefits. the sacrifice is you have to rev the tits off the car (which i love doing anyhow) and you will lose a little low down torque
theres a thread where i posted the results after the fitment, alot of other forum members with cams also contributed to the same thread on results.
you wont gain alot of peak power (i got 10bhp) put what power there is is sustained longer (at 7k rpm i was making 20bhp more) and in conjuction with a remap and raised limiter there are benefits. the sacrifice is you have to rev the tits off the car (which i love doing anyhow) and you will lose a little low down torque
