Mr. Buschur: HTA 35R with .63 hotside instead of .82?
Jan 30, 2008, 06:21 AM
#32
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I haven't tested back to back on the .63 and .82 housings. All the housings I've tested over the last month were .82 or larger. I'd compare logs from different cars but that is never a good fair comparison. I will guess though based on what I have seen over the last month of extensive testing on the larger housings. I would have to guess the .63 on a 2 liter is going to make 20 psi around 200 rpm sooner.
I know the next question is going to be how much more power does the .82 make, unfortuneately I cannot answer that with any accuracy. Part of me says none, part of me says up to 20 whp.
I tested the 1.06 housing. The car made more top end power with less boost than it ever had before. BUT the midrange was not good, the losses in torque were not worth the trade off for ME.
I figure by the time this is all done I will be able to build one bad *** "something". I have so many ideas running through my head for my next project I'm not sure what I will end up doing.
I know the next question is going to be how much more power does the .82 make, unfortuneately I cannot answer that with any accuracy. Part of me says none, part of me says up to 20 whp.
I tested the 1.06 housing. The car made more top end power with less boost than it ever had before. BUT the midrange was not good, the losses in torque were not worth the trade off for ME.
I figure by the time this is all done I will be able to build one bad *** "something". I have so many ideas running through my head for my next project I'm not sure what I will end up doing.
Regarding the 1.06 vs the .82, how much loss in torque are we talking, im guessing alot by the way you described it.
Reason i ask is i have a normal 35R, yes some people still use the non HTA
, with the 1.01 and the spool is best described as rubbish. To give you an idea how lazy it is, i have a dyno sheet infront of me and at 5500rpm its making about 9 psi, it hits 20 psi at just after 6100. Im not pointing the finger at just the big housing, the exhaust manifold isnt a great design and will be replaced probably afteri switch back to the 0.82. I need to reclaim my spool!!!
Jan 30, 2008, 07:51 AM
#33
The turbine housing, header design, wastegate placement, wastegate routing all have a major effect on spool up. So does the head, compression, exhaust system, intercooler and plumbing. It all has to work together. Your 1.01 housing doesn't sound like it is causing all your problems as 9 psi at 5500 rpm is just garbage, it is probably a combination of things.
Jan 30, 2008, 09:14 AM
#34
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Hi...here is some info.. in a sr20det same everything just a turbine swap 0.63 vs 0.82 at 28 lbs( 4 gear) both pulls(regular gt35r)
Hope you can get and idea
Hope you can get and idea
Last edited by JPSR20DET; Jan 30, 2008 at 09:16 AM.
Jan 30, 2008, 11:54 AM
#36
The .82 should make another 30-50 whp on a full tilt car than the .63. The difference in spool as dave said should be about 2-300 rpm sooner at lower boost levels, although I would venture a guess that the difference between spool times to make 30 psi would be more considerable in the 4-500 rpm range.
Scorke
Scorke
LT1 keep the .63 it's not worth it I promise
Scorke
Jan 30, 2008, 12:08 PM
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I can't find it but someone layed over my graph .82 over a .63 both HTA turbo's tuned by Buschur if we could find it you could see how the differences are.
Jan 30, 2008, 12:14 PM
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Jan 30, 2008, 12:16 PM
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Jan 30, 2008, 05:12 PM
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Well I'll probably make the move to twin scroll in the far future. With that said, I hope that I'll know which housing to go to. Weather it's the .82 or 1.06 in the twin scroll form.
Jan 30, 2008, 05:31 PM
#43
If you do go twin scroll 1.06 no doubt, when using twin scroll you have to go almost double in A/R to what you did in single scroll to get similar characteristics out of the turbo (which tells you something about what twin scroll must do
Most people that have experimented with small A/R's on twin scrolls have had trouble (in terms of making power) where as they go up in size and see very little deterioration to response and spool whilst making more power up top with the bigger A/R's....
The .63 IMHO is the way to go with the 35R. As I said earlier the difference between a full bore .63 and .82 a/r is 30-50whp depending on the setup, the gain in spool and response is worth it for that minimal of a gain which woulds only be in the upper realms/boost levels of the turbo (30+psi/6k+rpms)
Scorke
Most people that have experimented with small A/R's on twin scrolls have had trouble (in terms of making power) where as they go up in size and see very little deterioration to response and spool whilst making more power up top with the bigger A/R's....
The .63 IMHO is the way to go with the 35R. As I said earlier the difference between a full bore .63 and .82 a/r is 30-50whp depending on the setup, the gain in spool and response is worth it for that minimal of a gain which woulds only be in the upper realms/boost levels of the turbo (30+psi/6k+rpms)
Scorke
Jan 30, 2008, 05:39 PM
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Jan 30, 2008, 06:15 PM
#45
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