SBR Dual BB GT Turbos?

[4G63 For Me]

Anybody have any of the GT dual BB turbos from SlowBoyRacing? I've been thinking about getting one for a long time now, but the price tag is a tad steep. I'm looking for 500AWHP, and have most of the supporting mods.

If anybody has a GT turbo from them, I'd really like to hear your opinions about it (specifically performance related aspects, and if you think it's worth the price).

Thanks

 

[Black95TSIawd]

i'm looking at the GT11. You can expect instant transient responce and a GT11 isnt really a 'big' turbo so i should see full boost by 3300-3400 rpm. Ahh, i cant wait.

 

[4G63 For Me]

Anybody else out there have any opinions on them? Hopefully a few members that actually own the turbo??

 

[eclipse90gsxt]

I had a GT-12 for a little while and loved it. Being yes they cost a pretty penny they preform. I got full spool on my 12 at 20-24lbs right around 4K give or take 1K. Install was snap and the 3inch cover just fits, and I mean just fits with the front water pipe. I had to part out my car because I got laid off so I don't have a 1/4 time. It pulled so hard and kept going. I am just starting to get on my feet again from my finical problems, but I am looking at another GT series for a turbo again.

I can tell you though locally one of my friends on a GT-11 with the supporting mods(fuel/suspension/exhuast/SS manfiold/tires/tuning/etc..) ran a 12.1 @116mph. He couldn't get traction in first at all, or second at the track. His 60' was a 1.9 so that could be lower, and he was still a little rich. He planned on going to the dyno and get widebanded tuned but then he rolled the car a few times. He actually his selling his GT-11 with the manifold now. A little more tuned and some better tires, he had 11's. He also got 20-24lbs at around a little under 4K or so.

My other friend just bought a GT-14, and is basically building a race car, but that has to wait until next year for the times.
-Patrick

Oh His name is Kevin, this was his car...

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Then this happened...

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[4G63 For Me]

Well, I did it. I gave into the boost addiction and ordered a GT-14. When I receive it, get everything put in then take it for a ride, I'll let everyone know if it is worth the $$$.

Isn't it funny how when you start buying parts, you always set a limit to how much you'll spend? Then you end up going over it by a couple hundred bucks. Gotta love DSMs.

 

[!^3]

Well, I did it. I gave into the boost addiction and ordered a GT-14. When I receive it, get everything put in then take it for a ride, I'll let everyone know if it is worth the $$$.

Isn't it funny how when you start buying parts, you always set a limit to how much you'll spend? Then you end up going over it by a couple hundred bucks. Gotta love DSMs.

Couple hundred bucks?!?!

Since I purchased a DSM almost exactly one year ago, I've probably quintupled my original budget,

 

[4G63 For Me]

No, I mean everytime I go to buy parts. I set out a budget of $2000 this time (and I thought that was a generous estimate) and ended up spending $2220. And that was exercising quite a bit of restraint, as I'm sure a ported SBR cast manifold would have looked nice hooked up to the GT-14. However, being able to pay rent was a bit more important (not much, I wouldn't mind sleeping in the Talon). :laugh:

When I first bought the car, I didn't think I was gonna do anything to it. That changed real fast.

 

[eclipse90gsxt]

GT-14 is huge man, did you get the to4e cover or the 3inch one? My friend got the 4 inch one. He had the bend the front water pipe to make it fit.

 

[!^3]

When I first bought the car, I didn't think I was gonna do anything to it. That changed real fast.

Heh heh, sounds familiar "I think I'll try to make my car a nice daily driver"

And then I got addicted to speed. Funny how that happens

 

[4gsx63]

Local DSM guru is running SBR GT14. He ran 11.0@129mph and dynoed over 500whp.

 

[GSX_RCR]

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HOLY CRAP! Look at how the carbon fiber hood is still in one piece!

 

[David15151]

dude... what the hell happened to that car

 

[leakyfaucet]

What happened to the guy inside of it???

 

[suicidal2af]

FWIW, I'm pretty sure the GT11 and FP3052 are almost the same turbo. The 3052 has the wastegate flange on the compressor housing, but both are GT30 based 52 trims. Considering the same price, I'm opting to go with the 3052 when it's time due to the wastegate flange.

Slightly OT, but has anyone else ever put any thought into ext wg location? It seems to me that having it on the #1 runner would hurt performance slightly, with pulses from that cylinder being weaker than the rest(I'm thinking potential turbulence). Having the wg on the o2 housing, on the other hand, doesn't do anything to limit the speed that the turbine spins, which seems to me to be a more archaic way of controlling boost...possibility of the turbine spinning past its efficiency range, if you're running it at the limit.

Maybe I'm just thinking too much, but having it on the collector or at the top of the compressour housing(like the 3052 does) seems to be the most efficient way of doing it.

 

[NDgsx]

Slightly OT, but has anyone else ever put any thought into ext wg location? It seems to me that having it on the #1 runner would hurt performance slightly, with pulses from that cylinder being weaker than the rest(I'm thinking potential turbulence). Having the wg on the o2 housing, on the other hand, doesn't do anything to limit the speed that the turbine spins, which seems to me to be a more archaic way of controlling boost...possibility of the turbine spinning past its efficiency range, if you're running it at the limit.

Maybe I'm just thinking too much, but having it on the collector or at the top of the compressour housing(like the 3052 does) seems to be the most efficient way of doing it.

Yes putting it on the #1 runner is a not a good idea IMO. If you spray compressed air into a manifold you will notice that on #1 and #4 the air goes straight across towards the other exhaust port and VERY little air comes out the collector. So if you have a WG on the #1 runner the exhaust gas from #4 is going to come around and go out the WG as well (path of least resistance). Not all the gas is going to end up going out the WG and so you will end up with more backpressure on the #1 runner the next time that valve opens. All this leads to different amounts of exhaust scavenging from cylinder to cylinder.

I'm not sure what you are talking about saying that the turbine wheel will spin faster with an o2 housing mounted gate for the same boost level. That's impossible as turbine speed is directly linked to compressor wheel speed, which is directly linked to boost level.

You need to sit down and read a little more about turbos, you're calling the hot side the compressor housing. The turbine wheel is not the compressor, that's the other side of the turbo.

 

[4G63 For Me]

I got the T04E cover. My goals are 500 AWHP so I figured with a turbo rated at 600HP, I should be able to realistically make 500 (or close) with it.

I talked to Mike on the phone at SBR when I ordered it. He says he has it on his car, a stock 2.0 motor, and he sees decent boost by 3500 RPM. Not too shabby. I won't get my hopes up for spool up THAT quick, but hopefully I'll be hitting full boost by 4000 or 4500.

 

[suicidal2af]

Yes putting it on the #1 runner is a not a good idea IMO. If you spray compressed air into a manifold you will notice that on #1 and #4 the air goes straight across towards the other exhaust port and VERY little air comes out the collector. So if you have a WG on the #1 runner the exhaust gas from #4 is going to come around and go out the WG as well (path of least resistance). Not all the gas is going to end up going out the WG and so you will end up with more backpressure on the #1 runner the next time that valve opens. All this leads to different amounts of exhaust scavenging from cylinder to cylinder.

I'm not sure what you are talking about saying that the turbine wheel will spin faster with an o2 housing mounted gate for the same boost level. That's impossible as turbine speed is directly linked to compressor wheel speed, which is directly linked to boost level.

You need to sit down and read a little more about turbos, you're calling the hot side the compressor housing. The turbine wheel is not the compressor, that's the other side of the turbo.

No, I'm well aware of which side of the turbo is which. My point is, if you're limiting the amount of exhaust flow BEFORE the turbo to control boost, you have direct control of how fast the turbine/compressor will spin. If you have the wastegate on the o2 housing, though, you're limiting airflow after the turbo, and while you still control boost, the logic in my head is saying that you're not directly controlling how fast your rotating assembly moves. And while it may not make much difference, if you're operating at the far edge of your compressor's efficiency range, even a few extra revolutions could start to be counterintuitive.

 

[NDgsx]

No, I'm well aware of which side of the turbo is which. My point is, if you're limiting the amount of exhaust flow BEFORE the turbo to control boost, you have direct control of how fast the turbine/compressor will spin. If you have the wastegate on the o2 housing, though, you're limiting airflow after the turbo, and while you still control boost, the logic in my head is saying that you're not directly controlling how fast your rotating assembly moves. And while it may not make much difference, if you're operating at the far edge of your compressor's efficiency range, even a few extra revolutions could start to be counterintuitive.

Well you refered to it as the compressor housing, so it sure didn't sound like you did.
Um you are not limiting aiflow after the turbo. You have the totally wrong picture in your head heard. The o2 housing location is still BEFORE the turbine wheel in the exhaust path, just like the manifold. I don't know where the idea that you limit exhaust flow came from, but that is not how it works.

 

[doug]

Maybe this will help...

 

[eclipse90gsxt]

dude... what the hell happened to that car

Flipped 3-4 times when he lost control when he hit a wet spot.