TurboGuy

---- twincharge, VGT or bust. Extra weight and plumbing. I think Aero will vouch for VGT as well over twincharge.

aero

Not having any personal experience I won't say anything negative about it. Its definitely much more complex, but it can be pretty damn effective too. One of the guys on DSMTuners has had some pretty good luck with them.
http://www.dsmtuners.com/forums/bolt...os-inside.html
http://www.dsmtuners.com/forums/hang...riend-ray.html

OM617

Twincharging is really over hyped, its about 10 years too late. Once VNT turbos make their way into gas engines it will be a thing of the past.

TurboGuy

Staged boosting is a different story now. If you run the boost off a turbo to another or a supercharger, so the flow is in series rather than paralell you get a shitload of boost and don't stress the turbo or supercharger. However, its highly unlikely a gas engine would benefit from that as it does induce alot of heat. I considered just that for my MR2, but changed my mind when Aero was getting boost so low on his DSM. When I finally get my ---- straight and work picks up again, I'm going to build me a 20v 4AGE to run up to 40PSI boost, Not sure if I'll need that much, but the engine will be prepped for it.

SiFlyBy

i dont have any experience either, but what a fuckton of work for probably a minimal gain. IN the first on ehe has a stock looking turbo on the engine, IDK, maybe its a 20G but ----, put a GT40 on it if want top end and bottom end....or just spray to get it spooled....OH...OH WAIT, how about spend some time working with a VGT turbo?

aero

It was an 18g on the first one. It wasn't about getting a lot of power for him. The guy does rallycross so low end torque and midrange was of prime importance for him for getting out of corners. One of his posts said 30psi by 2800 rpm and this was on a trip to colorado at 8000 feet. High altitude greatly slows spool so that is pretty incredible. At lower altitude it made 25lbs by 2500, and around 450whp up top. It basically spools the turbo like it was a 3.2L motor with the pulley he has on the blower.
I'm not sure how a VGT around the size of a 18g would perform in comparison. Most of them are way smaller, or quite a bit bigger, but it would be an interesting comparison.

He did later go to a 2.3l, SC and a GT35R, but he moved across the country and hasn't posted a whole lot since. That stuff was in the second link, but I forgot you guys can't probably see that one unless you are registered over there.

http://picasaweb.google.com/Fast.DSM.../RaySCarStuff#

His youtube videos.
http://www.youtube.com/user/RayPeters85023


I thought about doing a twincharged setup but the VGT was MUCH simpler for me to do and cheaper.

CXyD

My twincharge build uses t04b for highend boost and SC14 for low end.

I have the turbo pumping charged air to the supercharger through intercooler then to the intake manifold.

My s/c runs between 1.5k to 6k rpms using an a/c clutch pulley.

To keep from having too much air forced on a closed throttle plate, I have a throttle switch setup to engage the clutch at a preset trottle position.

And if I do not want the s/c to kick on I have the master power switch hooked up to my a/c switch on the dash.

The turbo part I'm still working it out but when the s/c is not on I have an airflow control valve that route air around the s/c.

The idea is compound boost w/ the s/c running at a PR=1.8 and running the turbo PR=2.0 you'll end up w/ a combined PR=3.6.

Yes will run very high temps. but with good intercooling and not running at full boost for times longer than 10sec. this can reliable and fun.

I am doing this poject b/c I enjoy a good challenge it is so far a relativily cheap project in for just under a $1000 so far.

I am a Mechanical Engineering student.

As for boosting 4age 20v blacktop or silvertop I've always wanted to work on one those engines but couldn't afford it at the time.

If I ever by another TE chassis corolla I will have the 4age 20v on the top my list unless I get really lucky and get my hands on a 2TG engine.

TurboGuy

Your setup is somewhat staged and alot better than most that I have seen. Most people try to run one device for bottom end, and the other on top while having basicly 2 seperate flow paths.

CXyD

got the idea from http://www.geocities.com/motorcity/lane/1231/.

But since I don't have a corolla to build I looked at eg civic and said why not.

TurboGuy

I had not visited his site in a few years, but it looks like he took my advice. His first arrangement was pure fail.

The second setup was about right on

If he ran the blower full time, the check valve could be deleted.