Thread: Let's talk exhaust housings for a bit

I am actually looking at that right now.

Now, I can get a .82 housing which will flow good enough for the 550whp that my setup will never be able to make... so the 1.06 may just be really really laggy. But I hear a GT30R can make 600whp on the 1.06 housing

I think the .82 will increase volumetric efficiency enough to actually respond very close to the TS setup. But I don't think the turbo is going to be a response-restriction any time soon, the long ass intercooler piping is the biggest contributor to lag right now.

But that 1.06ar is tempting. Just to see what happens and how bad the response is. Has anyone run a housing this big before? I am 100% positive that the VE cams will respond a lot harder to the larger housing!

so would you say its getting back to the previous powe state? also you are still on the twin scroll yes? is it growing on you yet or are you still feeling you want a different housing?

The power may be BARELY over what it was with the log, and open .63 housing. Like, within 20whp for sure.

I love the response, and that is what I wanted. But it just seems like the motor should respond harder to the boost level it is at. It is way faster than the log setup, regardless of peak power numbers.

The .78 housing I am learning is really going to hurt my ultimate power goals. Looks like 24psi may get me to around 475whp or so. Who knows? I'm gonna put in some 100 octane and bump the boost up to 20psi and see how it feels.

I feel like the .78 may need more boost to get where it makes power, but overall there is less restriction on the system. The VET cams are going to stay in for now. Datalogging tomorrow. If the VE cams perform better, then I will swap them back in. But either way, I'm gonna up the boost tomorrow to see what she does.

If you guys had a GT30 sized turbo, SC61, HX30, S256 etc... Just something in the same power-level... How well would a .48ar housing work on a 2.0L engine? Since this is the only turbo car I have ever had, I would imagine it would choke it up pretty badly, causing slow response and crappy power.

Anyone ever just try it? Just for kicks? Accidentally?

i have noticed the srt boys swear by the .48 housing on the t3/4 50 trims and thats a 2.4ltr. Head flow must be pretty bad on these motors possibly?

Max power would suck, but spool would be great. I love my .82 A/R on the 30r. It's great when you can take it to 8~8500rpm

I would do a .48 A/R if you're only revving out to 6500rpm max. Don't forget that those SRT's have a HORRIBLE rev limiter, stock. (like 6240 or 6250rpm IIRC)

That is where I think I am heading. a .82 housing on my GT30R and some valve springs. Going to try some different cams too. I would like to keep the VET exhaust cam and try swapping intake cams to see what happens. The car sounds a bit different with the exhaust cam switching. It gets a little quieter and when the VET intake switches at 6500 it charges to the rev limiter. No traction in 2nd at all unless I warm the tires up.

I know that the .78 is going to restrict the power, but on higher boost levels the housing should still do decent, and I can still make over 500whp (according to ATP) but it will require about 27psi of boost. And to be honest, I don't think 10psi is going to get me 130whp, but I suppose it is possible. I am going to try some higher boost soon, and get some datalogs, but when I tried to do it last the laptop battery was dead.

Once again, someone can learn from my mistakes. .78ar will work great on a DET once again, but the extra 20* ov overlap the VE cams have really kills the power. I am wondering now if it is possible to get into crossover with a .82 housing on a 60mm turbine. Especially with lower compression. There are so many people hitting over 550whp with this turbo it is nuts, and to see my car (once again) as an underperformer when it comes to numbers is a shame.

I don't honestly see the .78 housing good for anything but track racing, where the response would be killer, and the boost can be raised with good gas. The VET cams are once again probably a winner here as well. They just seem to love the higher backpressure, and don't seem to mind at all. Here I am building a VE-T and it is starting to perform more and more like a 4G63.

the .82 housing is the one I have and I waiting on springs to get here ....I think it is the best option for our turbo ....I have been learning from you hardships ..and duing what I think will improve the performance to get me to 500+whp from the begining , tubular manifold .82 housing , valve springs , stand alone (AEM ) and a O2induction intake ....I think the standalone and a bigger housing will do it and I consider the springs to be icing on the cake , I understand you are worried about being emsion complient ( to an extent ) but I am sure they would frown on a oren dump for the wastegates also so if you chose stay with the MAF get an AEM, tune it , and swap you JWT back in when it is time for emission testing , if you need to be OBD2 compliant .......I think it should work ....

yeah you woudnt want to rev one much higher either.

The culum realtime should solve his tunning problems. If i am not mistaken the nistune software can be used? Bout $200aud for the software, another couple hundred for a wideband and it should handle things a lot better than the jwt.

I will be investing in a calum realtime in the future. I have wanted one for a long time.

Since it is my only option for tuning that would be obdII compliant...

The open wastegate dumps? Noone around here will even know what the hell they are lol, and they are pretty well hidden unless you know what to look for. Most emissions stations don't really check for that. They'll just look under the car for a cat. Generally, if the CEL isn't on, it will pass normally.

I am going to see how far this housing can be pushed. At least the response is where I want it, and the turbine efficiency should help power on some higher boost levels. Just gotta treat this motor like a DSM and boost the ish out of it. We'll see how it performs on the dyno, but the .82 housing will make its way on eventually. The air/water intercooler will be one of the next mods. Along with the housing, some cams, and valvesprings. Then the car should be pretty much where i want it.

The bad thing about living up here at 4500ft is that turbos don't respond as hard as sea level. Atmospheric pressure up here is maybe 12.5psia. This means turbos use more energy because they are kept at higher pressure ratios. On a setup like mine, this compounds the backpressure problems and can ruin your fun.

I still have some options on the housing, and supposedly a local place can make me a 1.06 housing that is divided as well. That would be awesome.