This applies to any car really but just trying to figure something out at the moment.

I tried a few months ago fitting a 65mm throttle body to my car and it didnt like it, said TPS was out of range and other bollocks so fucked it off and reverted to standard.

Somebody I know has just tried doing the same thing to his focus and the idle was up down all over the place and was popping and banging like anti lag gone wrong.

I take this to be the ECU rejecting the throttle body and can't map itself for the larger intake and thus screwing up the fuelling and thinking the car is on part throttle all the time.

Basically, what I want to know is, all the cossie people especially that have 70mm jobbies fitted, in order for these bigger throttle bodies to run correctly, do you have to map your ECU to accomodate them?

So basically if I tried fitting another one, I know it would do the same stuff again and not run properly, but if I got my ECU custom mapped (not a plug and play bluefin like I have now) like at TOTD or something, could they map it to run correctly with a bigger throttle body and so the ECU wouldnt say the TPS is out of range or not fuelling correctly?

Thanks

 

Dont bother!! 65mm it way to big even if you had 200 bhp!! It is not just the ECU that needs remapping your MAF would need recalibrating to. You would reduce low down torque to.

There are better ways of gain some bhp that what you want to do.

 

right thats fair enough mate.

Basic principles of combustion though more air means more fuel which means stronger combustion so by this principle the more air you can get in surely the better for the engine? Or is this the wrong approach?

 

Your engine will only use as mcuh air as it needs. Could you breath more air in if you had a bigger mouth? No because the amount you breath in is deterimed by your lungs and their ability to proccess the air.

Without remapping the ECU and recalibrating the MAF your engine will continue to want the same amount of air as before except the larger TB will confuse the MAF and it will run badly, waste fuel and lose power!!!

A 65mm TB would be bigger than the diameter of the inlet manifold anway!!

If it was that simple to increase bhp Ford would have done it!!!!

 

thanks for that mate. cleared that up at least