6 replies to this topic

[keefers]

Checking the throttle body, I noticed on full pedal depression the butterfly is not fully open, it is governed by a stop, is this typical? if so has anyone "adjusted " this stop for max opening, also any benefit to be had from machining butterfly fixing screws, they also are in my opinion far too long and projecting into the choke.. Thanks

[L400RAS]

I filled my stop down a little, to get the butterfly to open vertically. I do not know what benefit this has, but it makes me feel better knowing ive got fully open throttle. If you are going to do this, take a little at a time, as too much will mean it opens further than vertical, thus the same problem.

Regarding screws, i havent bothered.

Edited by L400RAS, 09 January 2010 - 05:00 PM.

[THE STIG]

yes its normal theres a phisical stop on the side of the throttle body

yes can be ground down to give full throttle, not sure how much differace it makes

[elvisthepizzaman]

You need to be careful when modifying the stop as the throttle position senor has an internally limited range of motion and it is possible to "over-rotate" it which would send incorrect position information to the ecu.

a word of caution: DO NOT TOUCH THE THROTTLE STOP SCREW. it is preset at the factory to within a degree or two of 5 degrees open throttle at idle. if you mess this up the engine will not idle correct. only fix is with a scan tool and watching the angle at idle.

[mykweb]

Yes you can modify the standard throttle body, but you will still suffer from the common fault of the throttle body warping under heat from the engine.

Plus you will never get the butterfly to fully open 100%. You might get it to open to 85%.

For best results get a Burlen Alloy THrottle body. Not only will you get around 97% opening. But you will get a quicker and lighter throttle responce.

I bought a second hand MG rover one and modified it to work with the MPi. Took a bit of footering about but saved myself a bit of £££ only thing I will say is that the Throttle position sensor will not fit if you have a standard mpi airbox. I have a k&n filter so it sits highter to clear the TP sensor

Mike

[keefers]

Thanks guys, guess the overall feeling is... best left alone, cant say its the most finely engineered piece of craftmanship in the world!

[evansisgreat]

Thanks guys, guess the overall feeling is... best left alone, cant say its the most finely engineered piece of craftmanship in the world!

But thats half the fun!