just wondering if anyone has the rpw hi flowed 65mm throttle body on their ride. was thinking of getting one and was wondering if it is worth it?
would i need to upgrade my ecu if i go ahead with this mod?

Contact Ez Boy he does the same job if not better for less money. It increases throttle response, very little done to overall power and no you wont need to tune your ecu.

afaik, ez boy's TB's are just high flowed.. the RPW ones are actually physically bigger, heeding different results.

correct me if im wrong however.

afaik, ez boy's TB's are just high flowed.. the RPW ones are actually physically bigger, heeding different results.

correct me if im wrong however.

You're wrong :D

RPW only made a handful of oversized TB's then discontinued the practice because the walls between the main part of the t/b and the water lines was getting too thin (or something like that).

I believe RPW might now offer an option to get a custom oversized billet throttlebody, but that is a different kettle of fish althogether, and most likely would require some form of retuning.

afaik, ez boy's TB's are just high flowed.. the RPW ones are actually physically bigger, heeding different results.

correct me if im wrong however.

Yep you are! I contacted them recently and they not longer do them. So I went through EZ Boy, heaps cheaper for the same thing. No power increase but very nice and responsive to drive. Everyone who has driven my car can't believe how responsive it is to the throttle :)

aah got ya, always good to know these things.. wouldnt like to go giving false info now would I :D

thanks for the info guys will try to get into contact with ez boy :cool:

Whilst you should get much improved throttle "response" from a flowed throttle body, be aware that in stop/start traffic, it is my experience (and at least one other forum member) that your economy will suffer (~1-maybe2 l/100km worse). Some people report better economy, I can only think that they don't have to endure stop/start traffic. This is not to discourage you, it's just better to do these things armed with the facts.

PS. Depending upon how handy you are, many members have flowed their tb's themselves. There used to be a good "how to" somewhere on the forum.


Ken

Yeah fuel economy does suffer a bit if you are doing continuous stop/start like I do for 15min to and from work. But if I drive from one side of town to the other which might take 40 of city/suburban driving, my economy is about the same or a bit better...

well i found i got better economy with the flowed TB, and then i got the RPW plenum and got even better economy untuned!! im now using about 9.1L to 8.9L per 100k ... so that is damn good, wonder how it would go tuned

afaik, ez boy's TB's are just high flowed.. the RPW ones are actually physically bigger, heeding different results.

correct me if im wrong however.

There was not enough reward for the risk (and rediculous machining) involved with actually oversizing, RPW realised it, so did I, so both RPW and myself can supply a high flowed throttle body of 65mm butterfly opening. I've never seen an RPW HFTB up close, but there are plenty of members who've had a good close look at my units, about 1/10 of them have spoken up here. :cool:

The aim is to remove the lipping cast into the TB adjacent the butterfly seating position, and realign the airflow path as flat as possible from the TB entrance, past the partially open butterfly, and into the plenum. Works well - should've been like that from the factory like other production cars of similar engine capacity.

FYI, commodore 3.8L V6 have a 60mm, the supercharged 3.8's are 65mm as are the 5L V8s. So our 65mm once highflowed will pass enuf air to feed a 5L V8 for 225kw+.

Cheers.