Thread: Let's talk exhaust housings for a bit

If you are making sub par numbers on your setup that means there its something wrong other than the turbo... Again you must have a problem in another place I will start to check on everything you changed since your las successful visit to the Dyno...
I have learned from the years that you need to make one change at a time because of this... since your last setup you changed: manifold, housing, cams, and msd box?? The manifold by itself should gave you like 40 whp everything else unchanged I dont think the less flowing housing can rob you such amount of power so you should start looking other things...
You may want to check on things that can rob you big amounts of power...
I dont think your housing its rubbing that much HP did you tried raising the boost on the dyno to check the Efficiency of your turbo?? You will have to check on things like cam timing ignition timing and mechanical condition of your motor maybe leak down test...

i personally think maybe a retune for all the new parts coheed has might benifit him

I think another system to tune the car would stop alot of the headaches also ...

I wouldn't spend another penny until I had a proper, tunable EMS.

EMS will not pass emissions here. I am waiting for a calum realtime.



Compression is good. Leakdown is good. Car burns no oil. Things that changed: Cams, manifold, turbine housing, MSD box.

Power is around 360-375whp right now on 15psi. This is about normal for most VEs, and for my 8.5:1 is reasonable. Higher compression would increase power about 5% or so to 9.3:1.

I didn't change the boost on the dyno, because I can tell you now that the boost leaks caused major compressor efficiency issues.

I just expected more of a power increase from the manifold swap, but alas the gains are not there. Cams? Not likely the issue since these are the cams of choice for this kind of setup.

Manifold? Not likely a loss of power here.

Turbine housing? You can see from the pics that the housing physically has a smaller discharge at the wheel. I've seen gains of more than 30whp on this turbo with a jump in housing from a .63 to a .82. Could there be even more loss if you theoretically put a .48 housing on? Yes, there could be.

The reason I wanna talk about housings is because I would like to discuss the pics above. Could this smaller area in the tight end of the volute cause backpressure and a loss of VE? Clearly I don't get any reversion, but the intake cam doesn't seem to make any power increase at all. When the ex cam kicks, you feel it big time. When the intake kicks, you hear the note change. But 5whp increase shows that there is an efficiency problem somewhere. The intake cam should gain at least 20whp.

I can put the VET cams back in and see if it makes more power, but it will likely remain about the same with just better spool. If I had to guess...

I'm thinking a bigger exhaust housing will decrease backpressure, increase volumetric efficiency, and the intake cam switch will start to make serious gains.

BTW I saw this on youtube

YouTube - SR20VE-T sentra at 150mph

Dude no offense but there's still something wrong with your car. My DET with only BC STG 3 cams and a 30r with EL manifold made 411whp at less boost, and that's on pump gas (93 octane).

A VE motor should make more power than that easy, all things considered...

tekkies motor is a freak motor but i do agree that you should be pretty close to 500 with that setup and all the supporting mods you have.

No more a freak motor than your motor, sir.

There is a VE here running a 60-1 turbo. 15psi made 420whp. Is that unreasonable?

I have no idea what the power is at right now. I can only look at the data logs and view the maf voltage, but I really think this housing could be the culprit. I've gone through everything else and I can't find anything. Unless it is the cams.

VET cams felt better in the midrange than these VE cams. Who knows, maybe they made more power?

Well it only takes 30 min to swap them out and see. I can do that tomorrow.

500whp? 15psi? What planet is this lol.

This setup WILL make 500whp. It will need 24psi to get there though. 15psi highest maf voltage seen was 4.6V. Around 4.7 is 400whp or so. 5V should be around 485whp or so.

I can just throw in some 100 octane and run 22psi and see what happens.