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I prefer the Jap method for quoting BHP...take the Skyline for example. Quoted @ 280bhp, actual more like 330bhp Only cuz the Japs cant declare more than 280bhp...hahaha! Imagine picking up your 172 and it actually had 250bhp - NICE!
Nope, the 22B had about the same power output on the rollers as the 2 litre STis or WRXs. If you are interested in hundreds of dynoplots, see www.scoobynet.co.uk. Interesting. And there are pictures of my EVO6 there as well...
Got my car rolling roaded today. I have piperx viper , scorpion exhaust + superchip. Fueling was spot on but power at wheels was 121.5 Bhp and at fly was 168 Bhp. Torque was 139 ib/ft. Bit low concidering the mods. The torque and power curves cross over at 6000+ rpms.
I dont have the original exhaust, to be honest the exhaust didnt add anything to the performance of the car. But the viper + chip seemed to have added some good low end. Interesting thing is the capacity of the viper is a lot less than the standard induction system.
Hiya Chun.. half the problem is that the induction kit adds nice noise, (it is actually possible to read the car better .. but thats an aside lol...)
the noise really DOES add to the experience and the whole kit strapped to yer ass feels better
the noise from a lot of sports cars is actually contrived..
I am NOT saying you are not gaining (although I am strongly of the opinion that you probably are not - until proven wrong. ) but, without objective testing, these things are often a waste of dosh, IF, you buy them for performance.. if the noise / sound is what you are after, then they are worth probably double LOL...
You can take any well established engine tuning catalogue.. say a kent engine (ford Xflow).. read the adverts.. add up the bhp for all addons available for that lump.. I kid u not.. you could have 300 bhp for peanuts.. ok, thats a joke.. but the figures dont add up.!
the manufacturer would NOT miss out on an opportunity to increase performance at no expense..
I just need to know why my cars running down on power. Ao any help is good. Reading various reviews on the net the piperx viper seems to be a good kit. Chip has helped but havent tested it just as yet. And the exhaust didnt take away performance, if anything my car went faster than m8s 172 after the exhaust.
You can estimate bhp figures for cars by use of a simple equation.
Power(BHP)=total drag x mph/375
But first you need to know the tested top speed of car (clio 138?) the coefficient/drag and the frontal area of car (average 19-23 sq f)
rolling resistance power 0.013 x weight lbs ???? x top speed (138)/375 =?????
air resistance power= frontal area(21?) x cd x0.00256 x top speed (138)/375 =????
add the two answers together to get a power at wheels and then add 15% for power at fly wheel to account for transmission loses.
Id like to know nicks (tested) top speed on laughing gas.
ive had that formula for ages, but who the hell knows the frontal area of their car!? ive searched high and low to no avail.
But it has some flaws like if you hit the limiter in 5th, then your gonna be doin a top speed of what ever the ratio dictates @ that rpm, but your gonna have more power thent the result of the equation because one of the factors (speed) cannot be tested accurately and with it bouncin off the limiter, your gonna have some in reserve.
Captain I think maybe the piper isnt a whole load better than the standard induction system. It has better heat sheilding but has less capacity and area to absorb air than the standard insuction system. So im currently buying some heat sheilding and a performance element to try out the standard induction system again. As well as this Im going to run bigger bore pipes from the front of the car. I think this would make the standard kit better than the piper stuff.
i spoke to nick hill yesterday and ne recons 163 bhp and argents kit was 6-7 bhp better than standard but says more likely to be 10-15 bhp increase when hes soughted the fueling prob out also he said most aftermarket filters are tested with the bonnets open and that its usually the case that when you shut the bonnet they give less bhp than the o/e that sucks but he is the daddy