my bro has a clio 172 when the car was standard it was put on the rolling road, it tested at 171.6 bhp after spending nearly 500 quid on a 57i and a ktec exhaust it was put back on the rolling road and only had 174.6 not a big increase for 500 notes should it be more or is that the increase to be expected
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Real power gains!!!
- Thread starter rsclio
- Start date
my bro has a clio 172 when the car was standard it was put on the rolling road, it tested at 171.6 bhp after spending nearly 500 quid on a 57i and a ktec exhaust it was put back on the rolling road and only had 174.6 not a big increase for 500 notes should it be more or is that the increase to be expected
That is probably a more than average power gain for those mods (if no de-cat)! Cars like the 16v/Williams/172 do not respond well to simple mods.
I remember when I used to work at Halfords and read Revs/Max Poo - I was convinced that a K&N and Big Bore 2 would make a bazillion extra bhp!!
The worst thing is that the mags used to recommend drilling the original airbox too - totally removing the whole point of having a sealed induction system and just sucking in loads of hot air! Dont get me wrong, a good free-flowing exhaust will give you more power as the mods get more serious (like cams, head work, throttle bodies etc), but not as stand-alone items. The power benefits of open induction kits are also highly dubious - especially in small engine bays like a Clio (although the noise is fantastic).
Id also ask for the at the wheel power figures as well, rather than relying on what they calculated for the flywheel (i.e. 174.6bhp) since the calculation of transmission loss is at best a contentious art.
well, they were dont at different times!
And 171.6bhp would be teh fly reading right, which is nothing more than a guestimate. Look for gains at the wheels.
57i.....crap, dont bother, i tested the open filter design and it lost 4bhp.....at the wheels which is more at the fly.
Exhaust gainsare minimal as the std system is very good, 2-4bhp gain is all you really gonna get, and if its a twin lambda setup, dont mess with teh cat, not worth it.
Back to the times......aimbient air temps play a huge role in power readins, as does the gear you run in and tyre pressures...the diff betweem 25psi and 35psi can be over 5bhp. Make sure its all constant thats all.
10% from a chip!!!
Good luck mate, there is only so much power you can gain from messing about with fueling and ignition maps, you have not got the airflow free for tha gain.
Go ahead though, itll be free!!
But then again he might tweek the Rollin Rd setting to give you teh appeared 10% increase. Why would Renault let it go with 10% more scope?
read my post in the 1/4 mileing times on teh discussion forum, youll see why 40BHP loss in the tranny is so hard to believe.
If you fit an open-air filter kit of some sort, make sure you take time to construct some sort of heat shield. Otherwise youll only loose power due to the hot air youre taking in. And 10% from a chip is quite a lot, expect less. For the rally car were considering taking the chip from Renault Sport. We talked with them and they said that it gives 190bhp, which I can hardly believe. They just claimed that the extra 18bhp is what they lost when they detuned the engine for better fuel consumption and environmental regulations. But what the heck, well give it a try...
Gijs
