UPDATED!!*DYNO NUMBERS* Comparison of Comp Turbo Billet 88mm CT6X-88 & GT91 Garrett!!
08-13-2012, 01:48 PM
#141
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You understand that they only have cast or billet compressors????
The billet 8079 does not work on a 6.0. Sprayed01 proved it.
Since the other guy asked about the 8079, have a look at Sprayed01s' posts.
If you want more rpm or power, go with a bigger turbine. Since it's a 5 series, it may take the 84 or 88 turbine also.
08-13-2012, 01:51 PM
#142
Josh - see if they can put a bigger turbine on it.
NRE stopped asking ITS what they thought would work and started telling them what he wanted for turbo sizing. They seem to not be able to understand LS turbine sizing.
I'd guess they don't have maps for their wheels.
BW has a calculator on their site and it calc's exh flow too. You could put your combo in and see what flow you come up with and tell Comp that number. -I'd ask what the current wheel/housing will flow first....
NRE stopped asking ITS what they thought would work and started telling them what he wanted for turbo sizing. They seem to not be able to understand LS turbine sizing.
I'd guess they don't have maps for their wheels.
BW has a calculator on their site and it calc's exh flow too. You could put your combo in and see what flow you come up with and tell Comp that number. -I'd ask what the current wheel/housing will flow first....
08-13-2012, 01:58 PM
#143
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08-13-2012, 02:04 PM
#144
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the gt50 is a 98mm uhp turbine wheel its what ill be using this go around. The ls engines just flow a lot of air. The 87mm 1.25 ar devided t4 bw turbine I had had 1.4 bp at 11psi boost
08-13-2012, 04:08 PM
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You understand that they only have cast or billet compressors????
The billet 8079 does not work on a 6.0. Sprayed01 proved it.
Since the other guy asked about the 8079, have a look at Sprayed01s' posts.
If you want more rpm or power, go with a bigger turbine. Since it's a 5 series, it may take the 84 or 88 turbine also.
The billet 8079 does not work on a 6.0. Sprayed01 proved it.
Since the other guy asked about the 8079, have a look at Sprayed01s' posts.
If you want more rpm or power, go with a bigger turbine. Since it's a 5 series, it may take the 84 or 88 turbine also.
08-13-2012, 06:29 PM
#147
Okay, heres a status update: they are ordering me a 1.39 A/R housing. It comes in Wed, but I will be out of town by then... I know a lot of you are saying it wont help much, and i probably agree. I going to humor the guys at comp and try the housing, and im looking at it like a learning experience. I'm curious to see how much A/R can effect back pressure. If/when that doesnt work, Im going to have them put the GT55 wheel in it. From there, I can make a better estimate of what A/R to go with the bigger wheel.
Thank you guys for the input. I know it sucks that its going to be a couple weeks before any updates, but work is what pays for the toys
hopefully this will be a learning experience for both myself and Comp, and if all works out, i still think this turbo will make some great power! if not, then ill probably look into a precision or garrett
Thank you guys for the input. I know it sucks that its going to be a couple weeks before any updates, but work is what pays for the toys
hopefully this will be a learning experience for both myself and Comp, and if all works out, i still think this turbo will make some great power! if not, then ill probably look into a precision or garrett
08-13-2012, 06:44 PM
#148
If this sounds like latin to you, PM when you get to that point and I'll tell you what to do
BTW I'd go with the biggest wheel I thought I could possibly spool while keeping the AR housing tight.
08-13-2012, 07:30 PM
#149
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08-13-2012, 08:45 PM
#150
Then don't put the biggest AR on it that you possibly can or really the second biggest one. I've always thought and never got the chance to test it that a large turbine wheel with a tight AR housing would offer the most potential as far as available boost that still gains power while offering great spool time because the AR isn't sloppy by huge because the turbine is too small and you're trying to crutch it.
Check this dyno graph out. This was a Borg S500 111mm turbine tested on a local X275 358 cubic inch SBF car.
08-14-2012, 12:37 AM
#151
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I'm getting about 52 lbs flow on the exh with a 1.0 110/99mm BW turbine with 20 psi & 30 psi BP @ 6600 rpm & ~1300HP.
I can email you a screen print if you want, PM your addy.
For adjusting the ratio, you watch the BP and waste gate opening.
I can email you a screen print if you want, PM your addy.
For adjusting the ratio, you watch the BP and waste gate opening.
Last edited by TurboS10; 08-14-2012 at 12:49 AM.
08-14-2012, 06:31 AM
#152
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No, and I misworded that slightly. I didn't mean the biggest I thought I could spool, because really with the right timing in transition areas, afr and cam for what you're trying to do specifically I'm a believer that you can spool more than what you could think with these LS motors.
Then don't put the biggest AR on it that you possibly can or really the second biggest one. I've always thought and never got the chance to test it that a large turbine wheel with a tight AR housing would offer the most potential as far as available boost that still gains power while offering great spool time because the AR isn't sloppy by huge because the turbine is too small and you're trying to crutch it.
Check this dyno graph out. This was a Borg S500 111mm turbine tested on a local X275 358 cubic inch SBF car.
Then don't put the biggest AR on it that you possibly can or really the second biggest one. I've always thought and never got the chance to test it that a large turbine wheel with a tight AR housing would offer the most potential as far as available boost that still gains power while offering great spool time because the AR isn't sloppy by huge because the turbine is too small and you're trying to crutch it.
Check this dyno graph out. This was a Borg S500 111mm turbine tested on a local X275 358 cubic inch SBF car.
Just some food for thought regarding the larger turbine in a tight a/r. I had the 79turbine before with a 1.00a/r. I decided for my own satisfaction to make the car a bit more peppy I would throw on an 84a/r housing (smaller displacement motor). I thought I would gain spool/trq (not hp) but it turned out the housing choked down that wheel so much that it spooled slower also made 110rwhp less. Put the 1.0a/r back on and the car woke up and the power was back and spool was back.
Sometimes too small of a housing will choke the turbine from the flow its capable of. If you want the overlay I think I can dig it up. Then it goes back to what you said, the right cam, the right tune,the right turbo specs.
08-14-2012, 08:49 AM
#153
Thanks for the clarification.
Just some food for thought regarding the larger turbine in a tight a/r. I had the 79turbine before with a 1.00a/r. I decided for my own satisfaction to make the car a bit more peppy I would throw on an 84a/r housing (smaller displacement motor). I thought I would gain spool/trq (not hp) but it turned out the housing choked down that wheel so much that it spooled slower also made 110rwhp less. Put the 1.0a/r back on and the car woke up and the power was back and spool was back.
Sometimes too small of a housing will choke the turbine from the flow its capable of. If you want the overlay I think I can dig it up. Then it goes back to what you said, the right cam, the right tune,the right turbo specs.
Just some food for thought regarding the larger turbine in a tight a/r. I had the 79turbine before with a 1.00a/r. I decided for my own satisfaction to make the car a bit more peppy I would throw on an 84a/r housing (smaller displacement motor). I thought I would gain spool/trq (not hp) but it turned out the housing choked down that wheel so much that it spooled slower also made 110rwhp less. Put the 1.0a/r back on and the car woke up and the power was back and spool was back.
Sometimes too small of a housing will choke the turbine from the flow its capable of. If you want the overlay I think I can dig it up. Then it goes back to what you said, the right cam, the right tune,the right turbo specs.
I think the 79mm turbine was just too small for your motor and a looser AR will help cover that up if it's undersized and not what it should have on there.
As you said about what I said, it goes back to pairing and matching every component to one another.
08-14-2012, 09:59 AM
#154
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That's interesting, but as you can see with a properly sized turbine like in the dyno graph I posted, the tighter AR housing made the exact same amount of peak power and killed it all the way under the curve by 200rwhp that's an enormous amount. Look how much sooner it made the power with the 1.0 housing and didn't lose anything to the 1.47 housing.
I think the 79mm turbine was just too small for your motor and a looser AR will help cover that up if it's undersized and not what it should have on there.
As you said about what I said, it goes back to pairing and matching every component to one another.
I think the 79mm turbine was just too small for your motor and a looser AR will help cover that up if it's undersized and not what it should have on there.
As you said about what I said, it goes back to pairing and matching every component to one another.
Amazing how you "think" you are going to do better and end up not.
Last edited by spoolin turbo; 08-14-2012 at 10:40 AM.
08-14-2012, 12:53 PM
#155
Thanks for the clarification.
Just some food for thought regarding the larger turbine in a tight a/r. I had the 79turbine before with a 1.00a/r. I decided for my own satisfaction to make the car a bit more peppy I would throw on an 84a/r housing (smaller displacement motor). I thought I would gain spool/trq (not hp) but it turned out the housing choked down that wheel so much that it spooled slower also made 110rwhp less. Put the 1.0a/r back on and the car woke up and the power was back and spool was back.
Sometimes too small of a housing will choke the turbine from the flow its capable of. If you want the overlay I think I can dig it up. Then it goes back to what you said, the right cam, the right tune,the right turbo specs.
Just some food for thought regarding the larger turbine in a tight a/r. I had the 79turbine before with a 1.00a/r. I decided for my own satisfaction to make the car a bit more peppy I would throw on an 84a/r housing (smaller displacement motor). I thought I would gain spool/trq (not hp) but it turned out the housing choked down that wheel so much that it spooled slower also made 110rwhp less. Put the 1.0a/r back on and the car woke up and the power was back and spool was back.
Sometimes too small of a housing will choke the turbine from the flow its capable of. If you want the overlay I think I can dig it up. Then it goes back to what you said, the right cam, the right tune,the right turbo specs.
by the way,, do you think i will have any alignment problems with this new housing? I hope the downpipe will still line up, and the placement of the turbo will be the same.
08-14-2012, 01:05 PM
#156
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That motor was missing 2 pistons and was half the size compared to yours...lol
I think with the larger housing you will see the gains you want.
The heat would not kill that much power. Thats what correction is for...lol.
When you say you were down 170rwhp was that at the same boost level as the previous turbo?
I think with the larger housing you will see the gains you want.
The heat would not kill that much power. Thats what correction is for...lol.
When you say you were down 170rwhp was that at the same boost level as the previous turbo?
08-14-2012, 01:28 PM
#157
That motor was missing 2 pistons and was half the size compared to yours...lol
I think with the larger housing you will see the gains you want.
The heat would not kill that much power. Thats what correction is for...lol.
When you say you were down 170rwhp was that at the same boost level as the previous turbo?
I think with the larger housing you will see the gains you want.
The heat would not kill that much power. Thats what correction is for...lol.
When you say you were down 170rwhp was that at the same boost level as the previous turbo?
with the comp turbo, it was making about 850ish on 15psi, but it would not make more boost, no matter how much more we turned up the boost (could be partially due to a small boost leak) but the backpressure is still 3:1, so that still needs to be fixed. I tried driving it on the street to see if it would make more boost, but 1 & 2nd gear spin too much, and 3rd gear im over 130mph, so i cant really replicate high boost on the street
Im pretty confident that fixing the small boost leak and the backpressure will fix that issue. I think the motor was just massively choking and wouldnt make any more boost.My whole reason for this new turbo was to get it to spool quicker, and carry the power longer instead of having it drop off so hard like that. Now im thinking that maybe my housing was too small even with the GT91 (i was able to reuse the same housing on the Comp turbo)
