Ported/Aftermarket TB discussion

[Murlo26]

Have you heard of any longevity issues with them? I know I heard one report of a failure but that's about it.

It certainly is a tough decision, but evo8/9/X there's kinda a few combos to go with (and I cannot decide what I want!)

Option1: Ported stock manifold, ported stock TB
Option2: Ported stock manifold, modified to 3" inlet, boomba 75mmTB, fancy 3" LICP, 3" FMIC outlet
Option3: aftermarket intake manifold w/ stock or boomba TB.


Man, we have the makings of a real test here :)

A very very expensive test....yikes.

I plan to go with the ported stocker and ported stock intake mani myself. I am struggling on justifying the rev3 over the rev2 as Clipse on evoxforums saw some very impressive gains with the ported stocker and rev 2 MAP mani.

However on a black I bet it would be worth it for the extra 300/400 bucks.

Scheides, 3" IC piping stuff just isn't necessary i don't think...even people on like 800whp setups I think see very minimal gains and sometimes just loses down low.

[scheides]

Yup just saying, the idea of doing it 'all the way' makes sense if you're gonna do the full 3" setup on the IM inlet and everything. IF this ever happens on my car, it'll be down the road. I will almost certainly do the ported stock IM/TB combo first, it is just too good bang/buck to not try. Before/after on the dyno? Maybe :) After that, I'd consider doing the same thing again if I upgraded to the full 3" setup. God knows I'd surely piss a ton of people off by publishing the results, so who knows. Someone else is welcome to try it though :)

Can you link to those gains that Clipse saw on evoxforums? I remember seeing that and kinda not really believing it.

[Murlo26]

http://www.evoxforums.com/forums/showthread.php?t=37413&highlight=MAP+rev+mani&page=5

MAP rev 2 mani and huge ass 1/2" intake spacer.

[Goat Blower]

A 75mm is way overkill, I learned that the hard way on my GSX, I never could get it to idle right even after converting it to use DSM shaft seals. Seeing that others were in the 9's on stock TB's, I would never go back to some crazy one like that unless I was building a 1000whp track car. I wouldn't go any bigger than a bored out stocker on a street car.

[goodhart]

How big of gains are actually seen on the dyno from these IM and TB mods? I thought on Kracka's IX it was very minimal for the price paid?

[Murlo26]

How big of gains are actually seen on the dyno from these IM and TB mods? I thought on Kracka's IX it was very minimal for the price paid?

Not sure on Kracka's car, but I personally wouldn't do this on a stock turbo car.

On an FP/CBRD turbo car it would probably be worth it.

Also, its really the last mods you can do on some cars before more power can only come from a bigger turbo.

edit: but the link I showed above, the guy showed 20whp/20wtq on average from the MAP rev 2 and a big ass teflon spacer.

[polishmafia]

Oh the X is 58mm stock? Boo nelly! Even worse than I thought. Good info.

6G72 3.0 (my car) stock size is 60mm.
6g74 3.5 stock size is 65mm.

In case anyone was wondering. :P

[DSM_421]

^ lol!

[scheides]

A 75mm is way overkill, I learned that the hard way on my GSX, I never could get it to idle right even after converting it to use DSM shaft seals. Seeing that others were in the 9's on stock TB's, I would never go back to some crazy one like that unless I was building a 1000whp track car. I wouldn't go any bigger than a bored out stocker on a street car.

On a DSM or evo 8/9 that use a BISS and ISC, I totally agree. On an evoX, the only form of idle control is the actuation of the butterfly, so these bigger TB's are actually very very driveable. Lomker has had one on his car for over a year now? It idles like a dream.

[scheides]

Not sure on Kracka's car, but I personally wouldn't do this on a stock turbo car.

On an FP/CBRD turbo car it would probably be worth it.


I think 20whp for the bulk of the powerband on an aftermarket, stock-frame turbo would be what I would hope for, but WITH the TB, not just the IM (that makes no sense to me).

On a stock turbo car, peak power may not be affected much but I'd bet that the powerband would be improved similar to this test that was published a few weeks ago:

http://forums.evolutionm.net/evo-x-dyno-results/537544-mil-spec-64mm-tb-ported-i-m-dyno-test.html

http://www.socalevo.net/gallery/albums/userpics/10141/milspec-tb-manifold%20test_1.JPG