172 on itbs with standard ECU

[Evogone]

Is this running LPG ?Whats the tube and pipes on top of the cam cover ?

Std ECU keeps the MAP readings, therefore you must continue to deliver these readings when on ITB's too, via the 4 vacuum takeoffs, and a tank to average or soften the reading making it acceptable for the ECU.

Cheers looked like a cheeky LPG / Nitro system LOL.

[16v_russ]

Link:

http://www.cliosport.net/forum/showt...e-13-on/page10


Cheers Laine - spot on :D

[schakal]

so this can be done with any set of throttle bodies ,even
a set from a bike as long as you can get an adaptor made to
fit them the head right ?

[16v_russ]

You will need the manifold to fit them, plus a way of getting the standard tps to fit - i tried testing a few different tps to see if i could get a simpler fit, but none gave the same readings, which is why I made the bracket to fit the standard one.

[schakal]

manifold can be made using some thick sheet of steel ,some steel tubes and welding skillorz iirc . making a bracket to fit the tps sounds easy enough .
the reason i asked this , you can get bike throttle bodies for piss money .
which could make this a much cheaper conversion

[16v_russ]

Possibly mate, but the reasons why I didnt go with bike bodies are:

1 - I needed 100% reliability, and I knew id get that with Jenveys

2 - bike bodies/carbs usually have a small butterfly and can sometimes give a very snappy throttle.

3 - I wasnt sure on the fitment of the Renault tps, I know aftermarket tps can be fitted, but upon looking at a few different sets of bike bodis I decided to go with Jenveys

4 - I wanted a decent size and these 48mm's are perfect

[16v_russ]

Well after getting back onto the rolling road that I have regularly used when my Clio was standard, I know whow how much power iv gained from the itb's:




a minimum of 37bhp!!!


Results:



209 bhp @ 7,028 rpm



165 lb ft torque @ 6,229 rpm





Ignoring the 209bhp,take notice that with only a cat back exhaust the Clio has made a consistant 171-173bhp and 149-150lb ft of torque on this rolling road.





This means by fitting the itb's its gained me a minimum of 37 bhp!!



Also comparing the graphs, I now have a minimum gain of 10bhp at any point in the rev range up to 5000 rpm, then after that its a constant 30+ bhp increase.



Ignoring the peak numbers, a gain of near 40bhp has made me over the moon









Before:













After