throttle bodies

[bob25]

Am thinking about fitting throttle bodies to my s2000 engine, has anybody done this, is it worth it , is there a noticeable gain in performance and which throttle bodies are best thanks for any feedback

[Greenstreak-Andy D]

Calling Dave Eastwood....

[Thrustyjust]

I believe its about 10 bhp to 15 bhp, better midrange , noise and a bit more noise. Hopefully all the sticky throttle bodies are now sorted from Omex. Not sure what Jenvey may offer and also depends on what ecu you also have , as Omex do a factory deal.

[bob25]

If nothing else you made me laugh

[bob25]

I have an omex ECU sounds like omex could be worth a call

[Thrustyjust]

6 minutes ago, bob25 said:

If nothing else you made me laugh

Good stuff. Thats what I try to do here. I considered it, but no use if I want to supercharge mine................

[bob25]

If you supercharge yours be interested on how it all goes

[Thrustyjust]

44 minutes ago, bob25 said:

If you supercharge yours be interested on how it all goes

Wont be for a while, until the current wife releases the purse stings a bit............

[CraigHew]

17 hours ago, bob25 said:

Am thinking about fitting throttle bodies to my s2000 engine, has anybody done this, is it worth it , is there a noticeable gain in performance and which throttle bodies are best thanks for any feedback

Have you searched the forum for "s2000 throttle bodies"  there are a few informative posts...

[Davemk1]

I had a set of the original ill-fated sticky ITB's which have been replaced by OMEX with a new set and I like them very much. I gained about 18 hp and 10ft/lbs (in the midrange) and that's a good thing of course but the thing I really like is the throttle response. The tip-in is very crisp an immediate and this is no doubt aided by the extra midrange grunt.

I like mine and would buy them again.

dave

P.S. - Happy New Year!

[Dave Eastwood (Gadgetman) - Club Chairman]

Ditto what Dave said! 

Mine was the original development car, so I reckon I’m on about the fourth or fifth set now! But, despite some frustrations at the early stages, the set on the car now, is such a transformation, I wouldn’t like to be without.

bear in mind the Westfield manifold is rather restrictive, so you need to compare figures on a like for like basis, (ie not against S2000’s with OEM Honda manifolds, or others that have had their own custom made).

Here is the initial before and after dyno run. Omex ITB’s are the only difference:

After the final set of ITB’s, incorporating all the new tweaks/refinements/enhancements were fitted, Omex dyno’d the Car and did a little more fine tuning, so this is the final plot:

I would say, with a better manifold, you’d be in the low, possibly mid 260 bhp at the flywheel range.

Please don’t misunderstand me though, I’m not “having a pop” at Westfield’s manifold, I know what a guy up this way paid to have one custom made for his S2000 engined Westfield, and it was considerably more than the cost of Westfields off-the shelf item!

The Omex ITB package for Westfield, comes with a map for the Westfield Omex 630 ecu. (The one the graphs are for, above). I presume, Omex can adjust this, if necessary, for their other ecu’s? If they can, then it does mean that it saves you the cost of having your car mapped.

The main alternative is the Jenvey ITB set up. The Jenvey’s, unlike the Omex, which are direct to head type, feature a Jenvey inlet manifold, plus four individual Jenvey SF throttle bodies, to mount on the manifold. This is a slightly more flexible approach, in that in theory, it allows different bore throttle bodies to be used. In practice, of course, the smallest size bore is going to be limited by the size of the inlet manifold - you can’t go smaller than that, without reengineering the manifold.

One thing to consider though, the Omex set up, was designed to fit under a Westfield V8 bonnet. The Jenvey wasn’t. I don’t know if it could be made to fit, with extra short trumpets, and a very flat filter, but I suspect not. The only one I’ve seen, needed the bonnet cutting out to clear the Jenvey’s. This may or may not be a problem for you. Power wise, I think they’re much the same.

Note though, that you would need to factor in the cost of engine mapping, on top of the price of the Jenvey kit.

[bob25]

Many thanks to everybody who replied looks like throttle bodies this year