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Old 07-11-2013, 10:58 AM   #1
subypal
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Default Twin turbo WRX (compound GTX35) number callout! ??? whp ??? wtq

I found this Subaru that a local shop "VSR Motorsports" has been working on for a really long time. It has been perfected, tested, and soon will go for maximum power on the dyno. Its a compound, twin turbo WRX that is fully built in both regards to the transmission and engine. It features "Subaru Block Supports" or block pinning, and will be running an unstated amount of psi. It has methanol injection as well. This setup should be good to 35 or more psi.


I'm guessing it will hit over 500 pretty easy, and maybe see more. What do you guys think?
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Old 07-11-2013, 11:06 AM   #2
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500 on meth or e85 with proper supporting mods isn't really unusual even with a single big turbo. It'll be interesting to see what it runs. If set up right (I assume it is), it will be interesting to see what it's running at. I know M@ from Wicked Innovation bought a bug eye as a daily and "threw in" a bunch of spare stuff he had hanging around and is running something like 575whp. I would expect that the twin setup could boost the low end numbers and support whatever high rpm numbers they feel safe with.
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Old 07-11-2013, 11:17 AM   #3
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Seems like a bit of an over kill. Even though its "twin turbo" its still a compound setup which just means that the smaller turbo will spool quicker to make up for the lag of the large gt35. With this setup, peak power should not be the goal, this setup is more for drivability, so there is no punch in the nuts when that gt35 kicks in at upwards of 4500rpm at whatever pressure they are going to be running it. Not a new setup by any means, its been done before and will be done again.

Example. This guy built this Lotus with drivability and power in mind, though its not twin turbo, its still the same concept with a supercharger.
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Old 07-11-2013, 11:31 AM   #4
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Wow small world.. VSR motorsports used be SnR performance here in tampa, i'v even seen this thing drive around town now and then, didn't realize what was under the hood. hopefully the owner of SnR didn't build this haha, they were the worst tuning experience/shop I have ever been to! Don't let that goofy guy in the video fool you either, hes just the receptionist and drives a carola.
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Old 07-11-2013, 11:54 AM   #5
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Originally Posted by subie bro View Post
Wow small world.. VSR motorsports used be SnR performance here in tampa, i'v even seen this thing drive around town now and then, didn't realize what was under the hood. hopefully the owner of SnR didn't build this haha, they were the worst tuning experience/shop I have ever been to! Don't let that goofy guy in the video fool you either, hes just the receptionist and drives a carola.
Wait wait wait...SnR is now VSR? Hold the phone, that means this car is going to pop an engine the first time they put the thing on the dyno. SnR has horrible build quality and even worse tuners. A buddy of mine had 3 engines blown there when they had it on the dyno (yes they built the engines and yes the warrantied them) but still, they blew up 3 engines within the matter of a month!

Knowing this info now, I have no hope for this car.
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Old 07-11-2013, 01:28 PM   #6
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I've seen this car being built. It's pretty nice. They also built my car. They have different techs and a different tuner. The tuner is great. He tuned my car. I didn't care for their original tuner. Other than it taking forever I have no complaints.
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Old 07-12-2013, 02:12 PM   #7
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So what's the difference between a "twin turbo" and a "compound turbo"? I'm kind of confused on this... thanks
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Old 07-12-2013, 02:19 PM   #8
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Quote:
Originally Posted by subypal View Post
So what's the difference between a "twin turbo" and a "compound turbo"? I'm kind of confused on this... thanks
Prob a series arrangement. So you get low end spool of little one and topend cfm of big one.
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Old 07-12-2013, 02:20 PM   #9
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Originally Posted by subypal View Post
So what's the difference between a "twin turbo" and a "compound turbo"? I'm kind of confused on this... thanks
A compound turbo is one smaller turbo and one larger turbo. So the smaller turbo spools quickly to takes away the lag time on the larger turbo. The potential for more power isn't there, but the acceleration is better with less lag. Most "twin turbo" systems are like this. But say the GTR has a turbo on each side being fed by two separate manifolds. Same turbos, same boost, more efficient etc. this is a true twin turbo setup
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Old 07-12-2013, 04:13 PM   #10
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Guy mentions the GTX 35 will feed the smaller turbo. Isn't it the other way around with compounding?

Newbie to compounding here, obviously.

Edit: I think dburgoon answered my question.
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Old 07-12-2013, 04:20 PM   #11
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Old 07-12-2013, 04:28 PM   #12
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Originally Posted by Gallo2011 View Post
Guy mentions the GTX 35 will feed the smaller turbo. Isn't it the other way around with compounding?

Newbie to compounding here, obviously.

Edit: I think dburgoon answered my question.
You are correct, the smaller turbo will "feed" the larger turbo. There really is no feeding though. The smaller turbo spools to say 14-15psi quickly, say 3000rpm for max boost. While the little turbo is hitting full boost at 3k rpm the larger turbo takes time to spool to say 27psi. For example the larger turbo won't hit full spool til 5k rpm. (I know it's exaggerated but it's an example) so while this large turbo takes it's time to hit full spool the car doesn't feel dead, the smaller turbo will give you the torque down low while the large turbo keeps you going to redline
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Old 07-12-2013, 10:31 PM   #13
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Thanks for the input guys, there is some good info in this thread. I'm excited to see how this car drives!!!
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Old 07-12-2013, 10:42 PM   #14
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Originally Posted by dburgoon View Post
You are correct, the smaller turbo will "feed" the larger turbo. There really is no feeding though. The smaller turbo spools to say 14-15psi quickly, say 3000rpm for max boost. While the little turbo is hitting full boost at 3k rpm the larger turbo takes time to spool to say 27psi. For example the larger turbo won't hit full spool til 5k rpm. (I know it's exaggerated but it's an example) so while this large turbo takes it's time to hit full spool the car doesn't feel dead, the smaller turbo will give you the torque down low while the large turbo keeps you going to redline
Compound setups are pretty awesome. Generally, the bigger turbo will feed compressed air through the smaller turbo. The exhaust gases from the small turbo (and the small turbo's wastegate) then feed into the big turbine, which has it's own wastegate. Makes for some pretty wild plumbing.
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Old 07-12-2013, 11:02 PM   #15
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Quote:
Originally Posted by dburgoon View Post
Seems like a bit of an over kill. Even though its "twin turbo" its still a compound setup which just means that the smaller turbo will spool quicker to make up for the lag of the large gt35. With this setup, peak power should not be the goal, this setup is more for drivability, so there is no punch in the nuts when that gt35 kicks in at upwards of 4500rpm at whatever pressure they are going to be running it. Not a new setup by any means, its been done before and will be done again.

Example. This guy built this Lotus with drivability and power in mind, though its not twin turbo, its still the same concept with a supercharger.
The World's Fastest Lotus? - /TUNED - YouTube
Franks lotus is different. It's all about ludicrous acceleration. The supercharger spools the turbo up to make 680 hp.

Also he wrecked it.
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Old 07-12-2013, 11:54 PM   #16
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^ when did he wreck it?
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Old 07-12-2013, 11:58 PM   #17
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Old 07-13-2013, 04:42 AM   #18
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^ when did he wreck it?
He hit a Porsche merging onto the highway/ the Porsche hit him and it went into a wall, I think. It was for sale and he ended up getting an Audi r8 or rs4
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Old 07-13-2013, 07:05 AM   #19
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Franks lotus is different. It's all about ludicrous acceleration. The supercharger spools the turbo up to make 680 hp.

Also he wrecked it.
my knowledge on Twin charging revolves around the old Toyota 4A-GZE engine. So I understand a bit on how it works.

Anyways that is not the first Twin charged car I have seen that ended up wrecked. For those who havent heard that term before it is not what is stated in the quote above. In fact twin charging has a little history in WRC before it was banned if this method of modding catches your interest.

Here is a link to a Corolla club site with twin charging info. apparently there are 3 methods to this. Which prior to looking this up I only knew of two.

http://www.rollaclub.com/board/topic...r-conversions/



Anyways back on topic. That lotus was one sweet car. Too bad it bit the dust though

Last edited by Lrn2Corner; 07-13-2013 at 07:11 AM.
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Old 07-13-2013, 02:11 PM   #20
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Default my guess

well comsidering i made 500 with pump and meth on 58mm im guess the upper 500 mabye like 600 on pump and meth and 700 on race gas... tq prolly gonna have to say they will be even if not more tq them hp cant wait to see..
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Old 07-13-2013, 02:15 PM   #21
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Quote:
Originally Posted by subypal View Post
So what's the difference between a "twin turbo" and a "compound turbo"? I'm kind of confused on this... thanks
Coming is another way of saying sequential twin really like the rx7 and supra.. little turbo aids is bottom end and spool while the big one handles up to power
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Old 07-13-2013, 03:44 PM   #22
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Coming is another way of saying sequential twin really like the rx7 and supra.. little turbo aids is bottom end and spool while the big one handles up to power
Twin implies the turbos are the same size. Sequential setups are generally twins which have parallel cold sides and series hot sides. Compound setups have both the compressors and turbines in series, with the big compressor feeding through the small compressor and the small turbine feeding into the big turbine.
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Old 07-13-2013, 04:39 PM   #23
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Wait wait wait...SnR is now VSR? Hold the phone, that means this car is going to pop an engine the first time they put the thing on the dyno. SnR has horrible build quality and even worse tuners. A buddy of mine had 3 engines blown there when they had it on the dyno (yes they built the engines and yes the warrantied them) but still, they blew up 3 engines within the matter of a month!

Knowing this info now, I have no hope for this car.
yup they merged together, i would never go back there again, spent 900$ there for them to hand me a broken car with a blown turbo and all kinds of problems, Bob the owner is an asshat. Dont trust these people or the build
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Old 07-13-2013, 04:45 PM   #24
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Originally Posted by subie bro View Post

yup they merged together, i would never go back there again, spent 900$ there for them to hand me a broken car with a blown turbo and all kinds of problems, Bob the owner is an asshat. Dont trust these people or the build
$numbers
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Old 07-13-2013, 06:47 PM   #25
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$numbers
You just want that 5,000th post.
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