11 replies to this topic

[Alice Dooper]

Anyone any experience or views on fitting a 52mm throttle body?

[nicklouse]

tends to reduce the performance.

[rich_959]

I seem to remember reading that it can have little (or even detrimental) effect. Standard throttle body is fit for purpose for standard or tuned MPI. I picked up a John Cooper 'S' throttle body, but in reality all that's different is it has a slightly smaller limiter so the throttle opens wider. And you could achieve exactly the same result by removing or reducing the limit-stop on the standard one. Not sure it makes any difference anyway, but I needed a throttle body and the 'S' one came up cheap.

[ukcooper]

 

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put one on mine over a tear ago , passed motx2 all ok , fitted just fine , took a while to find one to buy as noone had any for sale all had problems with them  even Burlen-spelling I know..??? havent drove it in the last year but mate saig it gose well..1.3 cooper/stage 2.75..

[Fast Ivan]

Anyone any experience or views on fitting a 52mm throttle body?

 

some report better throttle response and being aluminium it won't warp like the standard one can

 

but it won't give any more power

[pete l]

What about getting the standard one to open further, does that improve anything ? 

[rich_959]

What about getting the standard one to open further, does that improve anything ? 

 

Up for debate! I'd like to think that john cooper garages did it on their cars for a reason, but I've heard it makes little if any difference in rolling road before/after tests. 

[Fast Ivan]

What about getting the standard one to open further, does that improve anything ? 

 

it's going to make no difference

the standard throttle body is a long way off being the restrictive part of the mpi set up

 

as a test  - plug in a code reader such as the sykes pickavant, look at the live data from the MAP sensor, rev the engine and watch the reading shoot to 100, this is atmospheric pressure so if it reads this then you can't physically get any more air in - so the throttle body is adequate, unless you want to force it in, so forced induction

[nicklouse]

increasing the size only reduces the port velocities which in turn reduces the flow into the engine. bigger is rarely better .

[Alice Dooper]

What about getting the standard one to open further, does that improve anything ?

 
Up for debate! I'd like to think that john cooper garages did it on their cars for a reason, but I've heard it makes little if any difference in rolling road before/after tests.

I had my standard throttle body off a year or two ago and did the ‘Cooper’ modification to the limiter by using a Dremel to grind the limit stop back a bit.

Had a friends code reader attached up and it reads that the throttle is opening just a bout as far as it will go now. Didn’t notice a wild lot of difference but with my imagination I had a bigger grin when I opened the throttle up.

[Fastorq]

Is the 52mm K series throttle body same as the GTA 1400?
Read this recently.....

“The metro GTA was 1400, (16V K series) it’s an SPi type unit but runs with a bigger injector and the regulator is set higher (1.5 bar from memory) rated to 114bhp. I already have a Calver Supersport head and the forged rockers.
The advantage of this is plug and play, it runs off the same sensors as a standard SPi set up.
My car is a JDM so wiring is a combo of MPi and SPi.”

From what I’ve seen the Metro GTA had 74bhp not 114bhp.

[nicklouse]

Is the 52mm K series throttle body same as the GTA 1400?
Read this recently.....

“The metro GTA was 1400, (16V K series) it’s an SPi type unit but runs with a bigger injector and the regulator is set higher (1.5 bar from memory) rated to 114bhp. I already have a Calver Supersport head and the forged rockers.
The advantage of this is plug and play, it runs off the same sensors as a standard SPi set up.
My car is a JDM so wiring is a combo of MPi and SPi.”

From what I’ve seen the Metro GTA had 74bhp not 114bhp.

Not plug and play two very different engines.