Yeah, its gonna fit....and make 22 plus psi
01-23-2007, 11:08 PM
#13
1.0 BAR
Thread Starter
Join Date: Dec 2005
Posts: 397
Re: Yeah, its gonna fit....and make 22 plus psi
Originally Posted by Joseph Davis
The problem with twin charging is you net the efficiency drops of both compressors. 60% efficient turbo X 55% efficient blower = 33% efficiency. In the real world you don't worry a whole lot about the variance between 75% sweet spot on GT-equivalent compressors and the 60% they hit when you max them out, but a drop to 33% needs a lot of coolant to overcome knock, and you aren't going to get that with pump gas.
You're probably going to find that turbo + blower = boost spike. Doing the S-tube bypass is going to be mandatory if you want the setup to function... get a Saab wastegate that opens in the 4-5.5 psi range and use that to open the bypass, as soon as the blower has that much juice flowing a small turbo like the GT30 is already cracking.
You're probably going to find that turbo + blower = boost spike. Doing the S-tube bypass is going to be mandatory if you want the setup to function... get a Saab wastegate that opens in the 4-5.5 psi range and use that to open the bypass, as soon as the blower has that much juice flowing a small turbo like the GT30 is already cracking.
Yeah, for right now I am ignoring the above, cause I want to see what happens..... There have been alot of successful turbo into SC setups, its just that alot = 5.
And I can modify as I go. So if I need to remove the SC, it will take about 10 minutes!
01-27-2007, 01:33 AM
#14
1.0 BAR
Thread Starter
Join Date: Dec 2005
Posts: 397
Re: Yeah, its gonna fit....and make 22 plus psi
Wagon is up on blocks. STock exhaust manifold off. Tried a wrx manifold.. No go..... I would have had to cut/notch my crossmember. So I took a Borla exhaust off the shelf which I hadnt even thought of (doh!) and stuck that on... Bingo, we have a winner!
I will start welding tommorrow I hope. And take some pictures now that I found my camera charger!
I will start welding tommorrow I hope. And take some pictures now that I found my camera charger!
01-27-2007, 01:45 AM
#15
3.0 BAR
Join Date: Apr 2005
Posts: 4,890
Re: Yeah, its gonna fit....and make 22 plus psi
Originally Posted by reddevil
Yeah, for right now I am ignoring the above, cause I want to see what happens..... There have been alot of successful turbo into SC setups, its just that alot = 5.
And I can modify as I go. So if I need to remove the SC, it will take about 10 minutes!that just makes you a retard who likes to waste your time and money
01-27-2007, 05:56 AM
#16
1.5 BAR
Join Date: Jan 2006
Location: Rain City
Posts: 1,013
Re: Yeah, its gonna fit....and make 22 plus psi
Or just some tweeker with too much time on your hands. You're going to make more power with that GT30 running 30+psi than you are with a funky *** twin charger set-up hands down. I'm sure you're well aware of what J.D. ellaborated on a little, which is efficiency. It's math and math doesn't lie. You're gonna spend tons of time and resources and basically just waste a build on something that you and everyone else knows isn't gonna make near as much power as just the turbo. It's gonna be a bitch to get the car running and boosting right unless you're a monster with a standalone and laptop and all sorts of little nightmareish bullshit.
I'm pretty sure you know a lot about cars and boosting things so I won't keep telling you ---- you already know, but do know that you're wasting time, energy, and money on something that you could choose not to do and end up building something else. This kinda seems like one of those "omg I have the coolest idea and I'm gonna do it, I don't care if 9 out of 10 people that have tried it fucked it up; because I can do it" sort of things.
Well good luck either way and if you actually get it to work right I'll be impressed, but honestly I think it'll end up where TONS of other good intentioned totally custom projects end up; which is getting one really nice attempt at it, it doesn't work right, try like hell to fix it until you've finally had enough, and then you end up going another route. If that happens Bitchass's theory will be correct and that would suck for you.
I'm pretty sure you know a lot about cars and boosting things so I won't keep telling you ---- you already know, but do know that you're wasting time, energy, and money on something that you could choose not to do and end up building something else. This kinda seems like one of those "omg I have the coolest idea and I'm gonna do it, I don't care if 9 out of 10 people that have tried it fucked it up; because I can do it" sort of things.
Well good luck either way and if you actually get it to work right I'll be impressed, but honestly I think it'll end up where TONS of other good intentioned totally custom projects end up; which is getting one really nice attempt at it, it doesn't work right, try like hell to fix it until you've finally had enough, and then you end up going another route. If that happens Bitchass's theory will be correct and that would suck for you.
01-27-2007, 10:12 AM
#18
0.5 BAR
Join Date: Apr 2006
Posts: 178
Re: Yeah, its gonna fit....and make 22 plus psi
yeah i seen this done before over here, except a L67 blown and turbo'd gave nice power but i think you'll find the supercharger will be a restriction on the intake at higher RPM when its only turning at say 15000rpm and your turbos spinnin its **** off at 30000rpm... id loose the charger and go turbo all the way, GT30 is kinda big for that engine isnt it
