Hitchhikkr

The recent influx of dsm's that dont suck makes baby jesus happy.

onlyflash944

anyone else think of that revenge of the nerds movie?

and ---- looks straight, those variable turbine turbos are pretty darn interesting

Slo_crx1

Wow...that right there makes me damn proud to be a DSM owner again. That thing's gotta be a ------ rocketship, I'd give my left nut to be able to sink the money into mine to pull something like that off. Big props to you.

aero

Thanks guys.
As far as money spent on the turbo setup itself, I've spent very little. I picked up the turbo new never installed off ebay for $400 shipped. Other than odds and ends, fittings and such it was labor mostly labor, not money. I spent far more working on all the little stuff, injectors, AFPR ect than the turbo setup itself.

The turbos can be had for very little. There are usually 3-4 on ebay at any given time. Given the oldest one can be is 2 years or so, most are in very good shape. My friend just picked one up to experiment with for $200 shipped. It seems most people take the view of the above poster and steer clear of them or are scared of them because of all the stuff people pass around about garrett VNT's not being able to take the heat of a gasoline engine. The Dodge dealers have been pulling and replacing them because of a soot buildup issue causing the VGT mechanism to stick another reason they are plentiful at the moment. I shouldn't have that issue since we don't make nearly the soot a diesel will make and have higher average EGTs that should help burn anything off.
I guess I understand since its a somewhat unknown, and definitely not a bolt on due to the external size and the non standard flange, but I like figuring ---- out on my own and experimenting.

As for being a rocketship, its definitely not there yet. I still don't have an intercooler on it, and I haven't taken it past 4400 rpm at anything more than half throttle yet due to the boost creep without the wastegate connected. I did get my 1 bar spring in the mail today, so I can start tuning it out above that point. E85 and the reduction in exhaust manifold pressure definitely helps with offsetting the lack of intercooler, but it still isn't making big power or anything yet.

I'm mainly impressed with the spool, transient response and what should turn out to be a very wide easy to drive fast powerband.

Tom-Guy

Basically, ultimate street car championship material.

aero

I wish I had the funds and time to try something like that. The car would definitely need a lot more work to be well rounded enough.

I'm pretty interested in finding out how much the reduction in turbine restriction helps with power per lb of boost and keeping the power from dropping off at high rpm. Then maybe I can afford to pick up a SMIM and cams.

JD
With all the dyno time you've spent have you ever done back to back dynos with only swapping turbine housings that might provide some insight into the difference in power dropoff at high rpm?

Tom-Guy

The side of the turbine housing determines where choke point is for a given turbine wheel. Bigger housings are more efficient, and the turbine housing dictates how much fuel (hp per psi) is needed under boost.

aero

Yeah, I'm familiar with that aspect. Was wondering if you had any graphs of back to back type dynos with just a TH swap, since that is somewhat the way this works only on the fly.

It already feels better than the HX40/ BEP housing combo that I had a couple years ago. And this is 11lbs vs 17 on the HX40 and I was using a FMIC on that setup, although that was with pump gas instead of E85. I was sorely lacking in fuel flow to try running any more boost than that on the HX40 which makes me sad.

SDRAWKCAB

SWEET!

turbo4life

sweet.. get er dun