*Update*

Well the car has been repaired with new t/b seals, no boost leaks and got rid of the cat and changed from a megan 02 to the map ss02 housing. The megan wasn't allowing the 02 spring bolts to go in properly. I was spooling at 5100 on a 2.0 black also, and it turned out to be the flapper bent and insufficient preload on wga. Corrected the flapper and wga and now spool at 4100 or so in 4th. The result is +20whp and +65wtq and 1000rpm spool.



Hey evom, I have recently installed an fp black on pump, stock block. The car is okay, but it made 420/322 on djet. 27 psi pump. Now, I know much more gains are to be had, but my question is to what kind of gains. I am running a mil spec 100 cell high flow cat, cobb 3" dp, and hks hi power cat back, megan o2.

Known issue;

tb shaft seals are leaking with a boost leak test. No other leaks.

My tuner has said that there is a restriction and it might be the cat and to run a testpipe or larger exhaust. I don't want to run a testpipe to smell it up.

Can i really free up that much with a testpipe, larger catback? WIll a different o2 make that many gains. What about tb seals? how much am i losing?

 

Yes, you will see gains with a test pipe. Maybe 10-15 WHP.

What cams are you running?



-Bink

 

s2s with the beehive springs. What about the hks hi power? am i losing that much due to the pipe being 2.75 instead of 3"?

 

Well the cams aren't holding you back, so that's good news!

Is HKS Hi-power 2.75" from the cat all the way back? If so, you are leaving some HP on the table, not a lot, but definitely some.

I'd looking into getting a new O2 housing. Your megan is definitely choking the FP Black. Look into getting an Invidia O2 housing or an O2 dump.

Are any of your parts ported? Head / intake manifold / exhaust manifold / throttle body?



-Bink

 

Binky,

THe exhaust is 2.75 all the way and the exhaust man/tb/im/head aren't ported. What is the most important changes that need to be made to make this gain?

 

I have recently installed JMFab o2 dump on mine. i had the ported megan o2 housing before. big gains on spool up speed. as in from the time it starts spooling until its in full boost. it hits way harder now. full review will be coming soon
as far as going smaller exhaust, im going from 3.5inch SS ETS to 3in Trust Ti titanium setup DP back for both. i went with titanium assuming that .5in in diameter wont make that big of a difference. plus titanium is ballin i shall see.

 

i vote for EM ported with o2 dump
or megan o2 ported if u dont like the noise. i nthat case u can just buy mine lol

 

i was thinking a dump may make huge gains, but what about the noise and smell and emissions test? Also, would the .25" larger cat back promote spool? My current black is not spooling as fast as it should be. so what should I get done on the next visit to the shop.

1. Fix tb leak
2. Swap 02 to dump or nvidia
3. swap catback system to 3"


I don't plan on porting any parts just yet. I might port the exhaust man. Would the dump really improve spool that much and not sound like crap?

 

Hey,

So you got me thinking... I checked my Apexi GT Spec cat back exhaust and noticed that it was a 2.75" at some points as well. Damn it.

Looks like I'll be having to look into a full 3" cat-back next year.



-Bink

 

What FMIC are you running?

 

yeah, the dyno results here for fp blacks have been rather high and when I see what everybody is running, it's the same for the most part, but they are running a dump or testpipe and full 3". I never explored how much they really are gaining with these differences and I am going to have to now. I am confident the 3" cat wont kill my power that bad, but the megan and 2.75" with a tb leak might make me lose substantial tq and whp.

Ets has a decent price catback that is 3" that i might go with. I wonder if a toxicfab man would be worth it to do along with the 02 housing?

 

ets 3.5. There are no issues anywhere else that I can think. The intercooler is new and the car holds boost, just spools slower and not making the power that others are making there are greens making more power on pump that 421

 

Yeah I was just looking at ETS's cat back. Definitely a reasonable price.

I am going to have MAP fab me a custom version of this O2 dump/downpipe with a V-band clamp so if I want to drop the downpipe, I can do so without doing an O2 housing job every time:
http://www.maperformance.com/map-sta...2e-ss-evo.html

This is also a FULL 3", where most O2 dump's are only 2.5".


-Bink

 

Tb seals are a HUGE issue, so much power is leaking as the car is expecting that AIR so now you run rich. You power numbers are extremely low on TQ and WHP.

FYI on a Dyno Jet i made 454/400 with a JB Red. You should be near 500WHP at 29PSI and 400 FP's of torque, keep the torque under 420 and you'll be fine.

 

I have 2 3.0 02 eliminator Downpipes for stock frame turbos for sale. Why not purchase my used one for $300? It'll bolt right up, make sure you attach a test pipe or you'll will not gain any of the benefits.





https://www.evolutionm.net/forums/sa...pipe-dump.html