For those of you who have done porting to the UIM & LIM, how much did you gain? I realize that some of you port-matched the manifolds when you ported the motor, so you probably won't have a basis for comparison. Feel free to still post your impressions, but I am specifically looking for some BEFORE/AFTER comparisons of manifold porting.

Significant things to include would be nature of porting (engine and manifold), type of turbo, amount of boost, dyno numbers (butt or other), etc.

The more details you provide the better.

 

I don't know about power per say, but RTS3GEN ported his TB and UIM (can't remember if he did the LIM as well) and gained some uncontrollable boost (setting the boost controller off for 7PSI, he would creep to 15 PSI). Granted, he's on stock twins, but he had to add use restrictors on the exhaust side to get control over it again.

Other than that, he said it made his boost "mushy", not as punchy as the stock twins could be.

Since your running a single, these issues probably won't concern you too much, but just wanted to put it out there for anyone on stock twins looking to do this.

 

hmmm, I don't think many people have done a before and after dyno. I have ported my manifolds, BUT will be performing other mods as well, so it won't be 100% accurate. I should have dyno numbers this summer. We'll see. If anyone does have this info that would be great

 

do you know RTS3GEN's mods by any chance??? My manifolds are ported with non sequential twins, with a manual boost controller
Thanks

 

Basically,

Pettit Race Ported motor
DP, MP, Apexi Duals Catback
K&N Intake filters
Apexi FMIC
Pettit Unlimited ECU
Stock twins (he's running non-seq right now until his seq manifold shows up.. he didn't like the conversion)
Supra FP
I believe he's using the Profec B for boost control....

That's about it for the power stuff (let me know if I left anything out).

 

Hmmm interesting. I'd like to see what happens with my set-up:

mac filters with ebay hard pipes
3"dp, trust resonated mp, trust sp
hks fmic, koyo rad
pfc with base mod map
non seq with ported manifolds and ported turbos
hallman pro rx manual boost controller
street ported motor with 8mm wires and new plugs

well, we'll have to see this summer how bad it gets. I wonder if it might the the profec b that is causing the creep?? I remember reading somewhere that the profec b is optimal for sequential twins and the apexi avc-r is optimal for non-seq. ..... I dunno... we'll see. Another owner in town where I live, ported his manifolds on stock twins and has no problems

 

i wouldnt go as far as saying added horsepower is the outcome. . . maybe crisper throttle response. the runners are efficient enough to fill the combustion chambers w/o porting. i think the big deal would be better response.

paul

 

You can see some pics here: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/check-out-removal-my-2ndary-butterflies-246296/

The Profec B isn't the problem. The Apexi AVC-R is just harder to dial in for the sequential setup than the Greddy. Neither really cares in non-seq (single turbo) mode.

 

mahjik, i did that to mine. . . not too sure that it makes a huge difference. . . though, it might be due to my not having sequential turbos anymore. well, it COULD make a difference. i wouldnt know since i did everything at once.

paul

p.s. heres what i did to mine

 

I have done it too, but......... I enlarged my throttle, did a big engine port, lost the secondary throttles and ported and polished from the throttle down and out the backside.

I wouldnt think it would make too much of a difference on the manifold only, it might better the flow but actual HP numbers I would say "NOPE" as long as I understand you correct.

I mean if I did the mods that I did without doing that, it might not HELP, but I did it to reduce the crap build up and smooth the airflow..

 

hey jt. . . are you doing the throttle bodies like you were talking about a while ago? im still wanting to get mine ported out.

paul

 

I didnt do it personally "ROTORBRAIN" I actually sent it to my buddies shop for the butterflys to be made after the machine shop ported it. I can get it done for you if you need, but it shouldnt be a problem in the US, since shipping to here and back adds up..

 

the only reason why i can see for porting a manifold and throttle body is to feed a large intake port...other than that....porting the UIM and TB seems to be pretty useless

 

i agree that it doesnt matter on a stock port so much, which is why im interested in doing things like this. . . my motor is ported. this would make throttle response more efficient since there isnt much restriction through-out. im not going for horsepower numbers. . . cause i know it wont change that. . . just response and cool points.

paul

 

I still like the idea even if it won't change total HP. It should give more respond at least.