S5 turbo ported, running a straight 2.5in exhaust, with the boost line connected straight to the wastegate, it always creeps to over 1 bar by the middle of second gear, what can I do? God damn small wastegate. Guess its time for the single turbo, race wastegate heh.

 

does S5 turbo ported mean that you ported your wastegate? If so, is the flapper larger or smaller than the opening?

Also, it is possible that your wastegate is not functioning possibly. 2.5" should not be that bad for boost creep. My friend was running 3" exhaust and intake with the stock S5 turbo and he was only boosting 12 psi max.

My money is on a poorly functioning wastegate.

 

A ported S5 wastegate with only a 2.5" DP should not get to 1bar in 2nd gear! I agree, probably a malfunctioning wastegate actuator.

 

I tested it with compressed air, it works fine.

It is a jspec, but it came with aftermarket stuff, there was no turbo on the motor, came with an os giken flexplate, runs 80psi oil pressure all the time, and it handled 25psi for several runs, so it could be ported.

 

a flexplate? Automatic tranny?

There is nothing wrong with 80 psi oil pressure. Several cars are running upwards of 120 psi on this board :O.

What is your fuel system setup? Do not run that high of boost with the S5 turbo. Very bad news. Is it possible that your boost gauge is horribly inaccurate? Try replacing your vacuum line to the wastegate actuator, as it may not be receiving an accurate reading.

 

come on, i do know what i am doing.

Both my avc-r and haltech read the same thing, i have hit 25 psi on s5 turbo and it is fine. I have my own custom lines to the wastegate actuator, i have replaced many times.

I know 80psi oil pressure is not bad, it is good, saves me the trouble of putting the rb upgrade opr, but it isn't stock is what i am saying.

and yeah, an automatic tranny flexplate, os giken.

 

At 25psi you are should be blowing so much hot air I cant believe you are not detonating.

 

I have a front mount. And i was running 10 to 1 afrs, i can tune

 

Not for long. 25psi will be massively overspeeding the turbo, and will kill the bearings pretty quickly. Also the stock compressor looses efficiency rapidly above 10psi, so increasing the boost doesn't make much more power, but generates incredible intake temps. Even with a front-mount that sort of boost on the stock turbo is a recipe for an expensive failure.

 

Yeah, it wasn't planned , but boy did i walk that ls1

So does anyone know how to slow this turbo down?

 

oh and mt fuel is

-6an lines from tank, walbro, 550/1600, fpr

 

Restriction in the intake.

 

Pull the turbo off and port both of the wastegate ports. The S5 double port wastegate is better than the S4's single port one, but there's still room for improvement. Read this thread too.

 

I am no expert on turbos but couldn't you just get a pop-off valve, they are only like 150 bucks......

 

I thought you had a full to4E???? So what do you have a hybrid to4E? Hot intake temps will blow your motor regardless of how rich the afr(s) are, and your probably only have a 2 core fmic. What kinda of intake temps are you seeing from the Haltech? Something is wrong with the wg if you are seeing that much boost.

 

F that stock turbo. Get something huge.

 

ya you have everything but i big turbo............. get one...........

 

bump

 

Yeah i know i have everything but a big turbo, i also blew my wad on everything but the big turbo so i could get the big turbo later.

"Hot intake temps will blow the motor regardless" regardless it didn't blow the motor, i wasn't seeing scorching intake temps either, like 180 F or so at 25psi.

I have the stock s5, the to4e was on 10 month backorder from rx7store.

 

Ah, I was wondering about that.. Damn 25psi on that thing????!!!! I heard beyond 17 is pure hot air even with a 60-1 hybrid.

 

a 60-1 runs most effiecient in the 10-14 psi range, right around where the stock s5 turbo runs efficiently. BDC has made good power up at 17-18 on a 60-1 though.

It didnt seem like it was all hot air, plastered my *** in the seat, and it feels nice knowing i am one of the few who have run 25psi on a rotary with my own tuning and lived to tell about it

 

do you have a dyno chart suds? Or is that estimated rwhp? Link?

 

I dynoed at the local mustang speedshop, but they didn't give me a printout nor do i have a scanner had i a printout.

 

scum.

 

heh.

Low intake temps boost your power incredibly, as does haltech with the right amount of trailing split and leading timing.