New DP/Exhaust= higher boost?
 

i just built my new 3" downpipe and exhaust for my integra, and now my boost level has changed. i have a tial 9 psi spring in my ebay 38mm wastegate. when i had the 2.5 inch downpipe an world sport exhaust, it made 9 psi on the gauge, boost controller installed, backed out. now that i have the 3", its more like 11 psi on the gauge, but holds steady there even in the upper rpms in the higher gears. does this make sense? my dumptube isnt the best, but it worked mint with the old exhaust.

Re: New DP/Exhaust= higher boost?
 

Sweeter free flow for your GM-8 I guess. 2.5inches may have been chocking your truck turbo.

Re: New DP/Exhaust= higher boost?
 

possible, but its got a 2.5 inch outlet, i had to rig up a reducer for the 2.5 inch flange and the 3" piping.

Re: New DP/Exhaust= higher boost?
 

Yes.

Re: New DP/Exhaust= higher boost?
 

is it just 2.5 a few inches after the turbo?

how bout some pics? gotta build mine real soon.

Re: New DP/Exhaust= higher boost?
 

its 2.5 at the turbo outlet, i welded the reducer direct onto the flange. there is no 2.5 inch piping in my exhaust

thanks for your help jon

Re: New DP/Exhaust= higher boost?
 

and heres a pic of the car in its current form, no pics of the exhaust yet though

Attachment 28210

Re: New DP/Exhaust= higher boost?
 

Paint your intercooler black and you're set for life

Re: New DP/Exhaust= higher boost?
 

it will look like crap with the cut out bumper. once i get a new bumper/intercooler and get the car re-sprayed then thats the route i'll be going

Re: New DP/Exhaust= higher boost?
 

Turbo hondas love the 3" downpipe plus full 3" exhaust , it the only way I'd ever run a turbo setup.

Re: New DP/Exhaust= higher boost?
 

um, yup. i know. this isnt my 1st turbo honda

Re: New DP/Exhaust= higher boost?
 

Car looks nice man. What kind of power do you think you are making? I don't know anything about gm turbo's.

Also maybe since you got more flow, and ebay wastegate? IDK, just throwing it out there.

Nice whip though! Now get that ef boosted.

Re: New DP/Exhaust= higher boost?
 

i had a internal gated 14g and it was turned all the wya up made 15psi i got 3 inch exhaust and it instantly over boosted to 23psi.. blew the stock y7 lol its all in fun

Re: New DP/Exhaust= higher boost?
 

Exhaust gases will exit through the path of least restriction. Looks like your wastegate placement is shitty.

Re: New DP/Exhaust= higher boost?
 

I think it will look fine with the cut out bumper, that's exactly how mine is setup and it's gagagangster

Re: New DP/Exhaust= higher boost?
 

Why not black corners?

Re: New DP/Exhaust= higher boost?
 

you mean welded to the 4-1 collector on the manifold? wastegate placement is perfect.

because they look like crap. there needs to be SOME contrast.


i think it would look shitty on my car. i'll only paint my IC black you you TOTALLY cant see it.

this is my old sohc turbo hatch. no one had any idea. 13.9@103 :6

Attachment 28196

Re: New DP/Exhaust= higher boost?
 

hey hows the spool on that gm-8, im thinking of using it for my 2.0L and around 25psi. looking for 400hp.

Re: New DP/Exhaust= higher boost?
 

pms are great for questions like this. its good, spool is alot better than i thought. its a really good turbo for the money

Re: New DP/Exhaust= higher boost?
 

i cant decide between the gm-8 or a holset