throttle bodies

Just curious really . . What throttle body was fitted to the tf 135??

Ive read theres different sizes and alot of people rave about fitting a 52mm throttle body.

What differences are there performance wise??

Is it worth the upgrade??

With a bigger throttle body does the fuel injecters or airbox need to be changed?? Or is it just a case of removing the standard one and fitting the 52mm version??

The Tf 135 already has the 52mm throttle body, :yesnod: so you don't need to spend more money!

David Aiketgate wrote: The Tf 135 already has the 52mm throttle body, :yesnod: so you don't need to spend more money!

As above SO GET A K&N FILTER

Ok thats good news lol
Im gunna drop a k and n panel filter in the airbox come next service i cant be arsed with cone filters and sorting out cold air feeds and heat shields even if they do sound good a sports exhaust should be good enough for me.

Just curious what performance gains are to be had by fitting a 52mm throttle body if you dont have one as standard?

Just curious what performance gains are to be had by fitting a 52mm throttle body if you dont have one as standard?

Would like to know the answer to this one also.

Not sure if anyone has actually quantified the performance change but I believe that there is an increased responsiveness throughout the rev range and the car definitely FEELS smoother and quicker.

I've also added a CDA filter which takes its air feed from below the resonator box. It would be better to take it from the side intake ducts but I didn't want to faff around with cutting out the resonator box. I think the CDA filter also makes a difference and there is a nice induction noise with it when you open the throttle, without it being over loud.

This is from Rob Bell's website :-

Does the conversion work? We decided to find out at Dave Walker's rolling road at Emerald.

We compared maximum power and torque of the standard 48mm throttle body installed in my 1.8i MGF against it equipped with a 52mm throttle body. The absolute peak power gain appeared to be somewhat disappointing: we saw an all-but negligible 1 bhp difference between the two - very disappointing for a 100 quid investment in the new alloy throttle body casting.

But that's not the whole story. Whilst the torque does not appear to have increased much with the 52mm throttle body, there is an improvement to the tune of 3-4 lb.ft over much of the lower rev-range. Out on the road, this modest increase in torque, allied with a much sharper throttle response (which is largely thanks to the increase in cross-sectional area of the 52mm choke and throttle butterfly; any small throttle movement would result in a proportionally much larger opening through which air can flow with the 52mm than compared to the 48mm throttle).

The result out on the road was therefore much more impressive than the absolute gains would suggest; through the gears in town, the car seemed hugely more energetic, lunging forward with much more vigour with small throttle openings. One suspects that one would see much more of a power gain if used in conjunction with other engine modifications - but that's a test for another day!

Is it worth the investment? Well, I had a big smile on my face that couldn't be quantified by measures of bhp, so yes, if you feel that you can justify £100+ on an upgrade that is worth a bhp, an improvement in 'drive-ability' and a lot of smiles, then go for it. Just don't expect too much.