Im just about to send out a few things for ceramic coating. One item some people say to do....or not to do is the UIM. Well the way I look at it it cant do any harm (I hope LOL) and only help in keeping any heat away. I plan on doing both the outside and the inner of it.



My question is before i do this should i do any kind of porting on the UIM? I was told from someone to do it but i just want to make sure. Will giving the UIM a small port aid in anyway, or just leave it be? This is on a relativley stock car but if it helps in future use i will get it done now.

Any feedback kids??

thanx

Shawn

I've heard of one or two people having it done in a chrome finish. It may help save the wiring and vacuum hoses but the real heat and parts that should be daone are: Turbo manifold, exhaust manifold, downpipe and maybe the heat shields if you still retain them and want to spend more. You can allways buy heat coat in a spray can for those instead.

I am aware of the other parts for coating, and that is why i said I am sending the UIM out along with a few other things.

My question is about the porting of the UIM for greater flow?!

Does nobody know about this? Will it help at all?

Shawn

talk to jayspecracer7 about this...he put a cosmo 13b UIM and LIM on his 13BREW because the porting was much larger. Any reduction in restriction is a potential gain in power.

Thanx man........

Also...i was able to find out some info on this if any of you are wondering. This is something that should be done and is said to give about 20hp extra. Basically its just changing the holes on the UIM (top two). The bottom one is to be left alone but the top two that have the bar going through them is to be turned into one big oval. This is done by removing the seperating bar (should be done by a professional) between them and giving the UIM more flow

http://www.rx7club.com/showthread.php?s=&t...ghlight=rts3gen



like that? https://www.nopistons.com/forums/pub...IR#>/smile.png (it wont let me post the images)

I port matched my upper and lower intake manifolds to the gaskets. I used a air powered grinder with a flapper sandpaper wheel.

Are you saying to use the gasket as a stencil? So should I take out the LIM also?? I have been told that if im doing the UIM that the TB should also be bored out. What you think?

Shawn

Using the gasket for a stencil is a good idea because it shows you how far to go and still be able to seal it up well. If you're going to bore it out, it would be best to do all the components (LIM, UIM, TB). If you only do the LIM w/o porting the UIM and TB to match, its like having a big straw with two sponges in it....the early restrictions will take away from the benefit of the ported LIM https://www.nopistons.com/forums/pub...IR#>/smile.png hope that makes sense

Thanx for the response boosted.....I am about to tackle this with a friend in the next few weeks. How hard is it to take the LIM off as its far below? I was just going to do the UIM and TB cause i dont have the best in tools and shop area. Do you or any one else for that matter, have any pics of the porting job? Also could you clarify the removel of the butterflies in the UIM and what to do properly. I like to make sure I do things properly.

thanx

Shawn

im still on a stock ported motor and the non seq twins. so i havent ported anything yet! https://www.nopistons.com/forums/pub...DIR#>/wink.png pics would be nice to see though.

Ahhhh maybe those questions would be better suited for silver 93

LOL

Any help on the removel of the UIM butterflys would still be great also

if you are short on tools and experience, don't touch the LIM. i don't think you can get to the bolts with the turbos there and they are time consuming to remove. plus i'm sure something will break while you are removing all that **** - solenoids, vac hoses, studs etc.



unless you plan on porting the LIM and UIM and TB, its probably not worth doing just one. you could do more harm than good. i ported the intake on one of my vw once and it didn't feel all that good afterward down low. lost some torque down low and it ran like ****.



i'm considered doing my intake manifolds with Jet-Hot 2000 if/when I replace the turbos. I think it was about about $100-200 can't remember. I spoke with one guy on rx7club that did the jet hot and extrude hone and he said his car felt a bit more responsive and seemed to stay cooler.

the turbos have to come off. it will seem like a pain the first time but is not all that bad pretty straight forward.



i dont know about coating the ineer surface of anything though. if it does not bond 100% it will flake into the engine.



gl