I almost finished Porting my P30 IM which will be going in my B18C CRX, I'd really like some input negative/positive. Here are some Pics.

 

If you have the cams and a decent header, should be good. the p30/early skunk pro series manifolds suffer up top. hopefully the porting will at upper rpm..

 

I already peak at 8900 with Blox C, JDM 4-1 and PR3 Intake manifold i am just looking to Up my whole Powerband with this manifold and a 70mm TB from Phearable.

 

Did you flow test the ports.
How do you know they will flow equal numbers and not starve one of the cylinders when tuned?

 

I haven't tbh. If i tune it around 12.8 do you think it'll make that much difference to starve it ?

 

if you tune it to 14.7 and one or few of the cylinders flow better than others it will be leaner or other way around.

 

Does all the ports/runners flowing the same on the flowbench mean that they'll flow the same dynamically as well? When the engine is running? How do we know that even the OEM IM runners flow the same as one another? I'm not even sure if the runners on production IM such as OEM, Skunk, Edelbrock, etc even flow the same from runner to runner.

OP, those manifolds look fine. I am a fan of your second pick more so than the first.

 

nobody tunes full throttle at Stoich, And Slowsleeper you have a point there..I've never thought about that.

 

Your top one is fine, I'm personally just not a fan of sharp dividers in the IM, even though they aren't that sharp.

 

i thought when they bench test the porting they test each individual runner no?

OEM manifolds dont flow exactly same but almost everyone knows it by now and some tuners adjust individual cylinder trim to make up for that.

 

why do people always ASSume the wrong thing?

i didnt say that he tunes full throttle at stoich i said in general as an example...

 

For most street cars, which I would consider the majority of the people in this section to have, with 1 wideband from the tuner in the collector of the header, and no idea of what each runner in the IM flow, maybe just an idea of what each port flows IF they have a ported head that's been flowed, etc, I doubt any tuner is making blind individual cyl adjustments because that is what it will be, blind adjustments. If a tuner is willing to make blind individual cylinder adjustments then I would tell the customer to run!

Having the runners/ports flow exactly the same is not the end all be all. There's a certain a amount of room for variance before it really matters.

 

Port work looks good! Killer bee setup FTW! Actually got me thinking what if you ported the P30 runners and used the P73 plenum?

 

why?
wouldnt that be ported performer x?

 

No, because the B16 has smaller runners. Even ported are probably a bit smaller than an ITR or PX. Ported needs to be done so the motors don't choke above 7500 and the purpose of the B16 is for torque earlier. More plenum volume I'm sure would help with upper RPM's.

 

wouldnt a gsr manifold work much better at this point?

 

did you take any before pictures?

 

Sorry for ASSuming ( Nice wordplay ) but i mentioned 12.8 in particular. Here is my thinking 12.8 is on the safe side, even if a runner is flowing more it would lean out to what ? 13-13.5 ? hell even 13.8 is borderline acceptable in my book.

What Raver said. No reason to go through all that trouble and destroy 2 IM to have a similar effect to PerfX.

Sorry no Before Pics i feel dumb that jumped the gun with my makita and didnt take some shots

 

Doesnt aebs have exactly what you want? Ithink it has longer runners than itr and bigger plenum

 

I was between AEBS/PerfX in the start then i thought about that P30 i had laying around so i decided to port it. I wanted to do it myself so i can see first hand whats involved in the process and tbf it'll be a huge morale boost if it makes Decent power over my previous manifold

 

I'm porting mine and i took before & after pictures mainly for a visual point of referrence.
Doesn't look nearly as good as you porting but I'm not to picky on surface area rather than the shape.

in for the results.

 

Had to bump this thread because im curious of the results. OP, any follow-ups?

 

Yeah sorry for not updating. I Installed the IM along with a 70mm TB, and i havent dynoed yet. But when i tuned my car since i was planning on doing multiple changes soonish, we had redline afr aprox 11:1 so it wouldn't lean out. I retuned couple of days ago and AFRs where at 12.8:1. So it Definatly picked up Power how much i cannot say. Car picked up immense midrange and it accelerates far harder on part throttle. that's all i noticed sorry for the lack of dyno time

 

That must have been a lot of work. I like what see.

 

P30 ported manifolds on a 1800cc engine do surprise many people with there TORQUE band.