My high flow throttle body finally arrived today, so naturally I went down to the post office and picked it up. Took me about an hour all up to install, car started fine, idled a little higher then usual but thats no drama. I took my car for a quick test run down my street, definitely felt more responsive, although once you put your foot down a bit it starts to accelerate then dies for a second as if the throttle is sticking or something, then it accelerates again.

Has anyone else ever had this problem with a high flow throttle body? Any ideas on what might be causing it? And also, my car has cruise control but it controls the throttle via a second wire attached to the accelerator cable itself, where as the one on the high flow TB I got now has a big vaccuum canister attached to the throttle body, my guess for crusie control, would this matter in anyway?

Ajustable fuel pressure regulator required and piggy back comput to pump that extra fuel into her 8)

Has anyone else ever had this problem with a high flow throttle body? Any ideas on what might be causing it? And also, my car has cruise control but it controls the throttle via a second wire attached to the accelerator cable itself, where as the one on the high flow TB I got now has a big vaccuum canister attached to the throttle body, my guess for crusie control, would this matter in anyway?sounds like your is not a factory fit cruise control (or maybe that was the way they did it in the TF's, i've seen this before, and the owners swore it was factory)...but one that uses the actuator on the accelerator cable as mentioned....thus using the standard TB.... if Dave has sent you a cruise control unit from an later model it maybe different and have a function that you car doesn't know what to do with....

I'm only guessing here, but that change in the actually variant of TB would be the only thing i can guess it to be! If its not getting controlled properly then it mighten work well!

I rang RPW, they said it was just that the throttle position sensor wasn't aligned properly. Best thing to do was take it to mitsu and get them to align it, 10 minute job.

SexedTF'n, your cruise control must be a non factory.Mine has a cable and is attached to the throttle body shaft via a bolt on bracket.

I took it to mitsu, surprised I could get in on such short notice, normally they're booked up for a few days. Anyway, I got mitsu to align the TPS, all done and all good, car ran fine although Im not happy with the feel of the high flowed throttle body, the main reason is, it does make the car feel more responsive just as you put your foot down, and it picks up a fair bit for the amount of throttle, but then once I put my foot down further it doesn't have the same amount of responsiveness there for making the car feel like it has a flat spot or the power is surging, not a real good feeling.

And mine being an auto, even with the old throttle body, cruising along at 60, if I let my speed drop to like 55 and put my foot down a tiny bit to get back up to 60, it'd drop back to 3rd then change back into 4 th. This was amplified when the high flow unit was fitted, as the tiniest pedal movement would cause it to accelerate enough to drop back into 3rd, very anoying and not my idea of comfortable driving.

And Im not sure if my cruise was factory fitted, although it does have a 'mitsubishi genuine' sticker on the cruise control box in the engine bay.

That's why the installation of a rising rate FPR (FSE) is recommended at the same time as the TB as it helps remove those flat spots from memory...

That's assuming these flat spots are related to a lack of fuel. I suspect they aren't.

did mitsu check out your oxy sensor at the same time?

[quote:01871856da]did mitsu check out your oxy sensor at the same time?[/quote:01871856da]

Nah, they just did the TPS, unless they do a diagnostic test at the same time, but nothing I know about. I put the old throttle body back on today, car runs fine again, aligned the TPS myself via white markings that were already there before I removed it.

Anyway, Im gonna give RPW a call tomorrow, hopefully I can send the high flowed unit back and (read:hopefully) get a credit that I could put towards a set of RPW race design extractors. But I wont know until tomorrow.

Don't get me wrong though, the high flowed throttle body isn't a bad piece of equipment. The last thing I want to do is rubbish RPW's products as they were very helpful and knowledgeable, and the throttle body did do just as was promised, the feeling of the high flow unit just isn't for me, thats all.

Cheers.

So this is normal behaviour for all cars that have the high-flow throttle body fitted or is this a one-off ??

If you fit the High flow throttle body, do you need to install a FPR and aftermarket computer at the same time or is the unit beneficial on its own ??

If you fit the High flow throttle body, do you need to install a FPR and aftermarket computer at the same time or is the unit beneficial on its own ??

It might help but I reckon it would depend on whether it's leaning out under acceleration which you can't simulate on a dyno. Tuning with a Unichip / GReddy might remove this without a need for an FPR.