good point. I am also interested in knowing if any HP increase at all can really be had with one of these, or a bored out stock throttle body

 

I have one and I have modified UIM with cut out holes.

It might be in my head but response feels better than before.

 

I like how much cleaner it looks compared to the stock one. Has anyone blocked the ISC port on it?

 

I have a Cosmo RE u.i.m. and Feed elbow, would the 20b rotary works t.b. be the way to go?

 

Do you have any pictures from when you port matched the UIM? Could you go into a little more detail about what you did to the UIM?

I'm seriously considering buying this throttle body and doing this.

 

ISC is located on the UIM, tiger

 

I don't have any pics of the inside... Just these.








pretty much some of the stuff you see here has been cut and opened up.

 

In my experience these kind of parts should be at the end of shopping list for power, response, weight reduction or whatever you are trying to gain. Often the difference is hardly noticeable and they only make a big difference when installed together with other parts (eg pulleys etc.). Having said that compared to some other useless parts we buy this part is really cheap so I wouldn't think too hard about it. If you like it buy it and try it

 

How is this vs THE FEED BIG TROTTLE BODY?

 

I was thinking if it is going to make a noticeable difference it would be on a car with high boost and high hp. I have done like everything to get the most power out of the stock turbos, and alot of weight reduction, so I would be interested if this or any other throttle body can give any little better flow and hp increase. also is there any intake manifolds that will flow better and give more hp maybe especially in combination with a bigger throttle body? thanks

 

^ you can get the intake manifolds (UIM/LIM) ported out and smoother by Extrude Hone.

I'm waiting on getting mine back right now, I sent my stock TB off for porting/smoothing by RC Engineering and my UIM/LIM off to be extrude honed, they should all be getting ceramic coated right now.

Long story short, having it all done together is claimed to net an increase of ~48% airflow potential and balanced flow to less than 1% difference from front to rear. It's supposed to show significant gains at 4500rpm+.

I won't know how true this all is until they all get back and I get her on the dyno.

 

Who performs this extrude honing service and how much are they charging for the UIM LIM?

 

Extrude Hone itself does the honing. I went through r0t0rhead here on the forum for a package deal. You may want to speak with him regarding just the UIM/LIM, or deal directly with Extrude Hone at www.extrudehone.com

 

i would buy 1
u guys can play with it and give it bak to me
no shipping
but again will it make a diffrence in my stock fd lol

 

Most likely not. On an otherwise completely stock FD this TB would probably be little more than a cosmetic upgrade.

 

I'm no expert in the field of extrude hone but I have looked into this a while back.

Extrude hone will clean up and it might slightly open up the inside. It does smooth the inside but some say on FI cars its not as beneficial as NA cars. Porting on the other hand I have seen people make 'some' difference in power. However, only when moving to extreme change will lead to noticeable power.

In your case, are you going to ceramic coat the inside? I'm sure you are not but wanted to make sure. Also, LIM, some say extrude hone the LIM might negatively affect vs. positive. Also this is minor and for force induced rotary. Please don't listen to me but do your own research and find the best answer for you. I can't recall the details but when I decided to do it back in early 2000, I decided not to because most of this was for NA set up. FI is slightly different game.

I agree that TB or ported UIM makes minor change and few will really notice if any.

 

I wouldn't call myself an expert on the subject either :-) However, as I understand it extrude honing is basically the process of forcing a thick, abrasive, liquid through whatever is being honed, essentially sanding it down evenly on all faces from the inside out. I should think that the amount removed depends entirely on the force and duration of the job.

To be honest I'm not 100% on the benifits to FI versus NA vehicles. Why do you say that it might be detrimental to have the LIM done?

Iirc, the exterior of my UIM/LIM will be ceramic coated, the interior will be teflon coated. I'm not positive off the top of my head though, so don't quote me on that.

 

i used the setup i got from Rotary-Works on a cosmo LIM/UIM. the throttle response is a bit crisper than the stock TB. I know this cuz I had an FD right next to my car to compare it to and there seemed to be a bit less hesitation on my setup. I did have to fab up a block off plate to block off the lower "eyebrow" shape port that the Cosmo manifolds have and to block off the lower passage on the TB.


see the lower eyebrow.


the RW TB does not cover it so i took a piece of heavy gage aluminum sheet and i cutout a "gasket/block off" plate to sandwich between the TB and UIM. it was an easy fix.


a $4.99 throttle cable bracket from local parts store, spectre brand, used backwards and cut out to slide in FD throttle cable....works like a charms and retains use of Throttle cable adjustments!!


the whole setup assembled....


and a short video of car fired up on first try and not even tuned yet.

 

I see it's a RW elbow in the video. Does anyone know if RW TB can be used with Greddy elbow without fitment issues?

 

they both fit. its the same bolt pattern as a stock TB

 

Thanks for the reply rotorican but I wasn't asking about the bolt pattern. RW looks thicker then stock (but maybe it's my eyes....) so I was wondering if there'd be a problem due to width with greddy elbow and intercooler plumming. Highly unlikely but I thought I'd ask.......

RW elbow is a 90degree bend whereas Greddy elbow curves in like a 60 degree bend.

 

Here is mine:



A view with the modified UIM:

 

what is that uim setup coated in?

 

gloss black powder coat

 

pure sex. both of the uims above