My observations and opinions of current street/strip turbo LS trends.
08-20-2012, 06:08 PM
#181
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INTMD8, your malibus setup has about the exact powerband i want when i do a turbo setup. i saw with a lil google fu that you used an eboost to keep the boost consistant; how would you recommend getting the same curve/spool but getting it to carry to around 7k on a comparable 6L?
08-21-2012, 10:37 AM
#183
THAT is an axial flow turbine. BASICALLY, they took Turbofan engine technology and shrunk it. super light, super fast spool, etc. id expect the next trick would be to have blades that can change pitch while running. something like that stuck in a smaller turbo housing would make twin setups absolute insanity.
look familiar?
look familiar?
Also they already have RC sized axial flow turbines (aka reaction turbines), so I bet it's not long at all.
If you can get castings done for the turbine housing, here you go:
http://jetbeetle.com/
Also if you turn the turbine/NGV backwards, you can reverse the inlet/outlet of the turbine, making for more possible turbo mounting solutions.
Last edited by slow67; 08-21-2012 at 10:54 AM.
08-21-2012, 11:28 AM
#184
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INTMD8, your malibus setup has about the exact powerband i want when i do a turbo setup. i saw with a lil google fu that you used an eboost to keep the boost consistant; how would you recommend getting the same curve/spool but getting it to carry to around 7k on a comparable 6L?
So you have to make a decision. Do you want nearly instant response at the expense of high rpm power or are you willing to compromise some low end torque for high end power.
08-21-2012, 11:29 AM
#185
These things have been about for a LONG time. The first turbojets were actually like turbos! Both the compressor and the turbine were angular flow (??) like a turbo. Also some modern jet engines (poss turboprops) use centifugal compressors as you only need one stage to get the required compression ratio.
As someone said they have small jet engines these days so the tech to make small turbines and compressors is there.
I was on another board were a simplere topic was discussed. Peugeot developed some time ago a twin chambered compressor housing. one side was very small and ther other much larger. This helped improve air velocity at low operating speeds. Intresting idea!
Chris.
As someone said they have small jet engines these days so the tech to make small turbines and compressors is there.
I was on another board were a simplere topic was discussed. Peugeot developed some time ago a twin chambered compressor housing. one side was very small and ther other much larger. This helped improve air velocity at low operating speeds. Intresting idea!
Chris.
08-21-2012, 01:28 PM
#186
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These things have been about for a LONG time. The first turbojets were actually like turbos! Both the compressor and the turbine were angular flow (??) like a turbo. Also some modern jet engines (poss turboprops) use centifugal compressors as you only need one stage to get the required compression ratio.
As someone said they have small jet engines these days so the tech to make small turbines and compressors is there.
I was on another board were a simplere topic was discussed. Peugeot developed some time ago a twin chambered compressor housing. one side was very small and ther other much larger. This helped improve air velocity at low operating speeds. Intresting idea!
Chris.
As someone said they have small jet engines these days so the tech to make small turbines and compressors is there.
I was on another board were a simplere topic was discussed. Peugeot developed some time ago a twin chambered compressor housing. one side was very small and ther other much larger. This helped improve air velocity at low operating speeds. Intresting idea!
Chris.
the small jet engines are neat lil buggers.
it sounds like Peugeot took the idea of a compound turbo set and managed to put it into a single turbo package.
i wonder what other "stock" turbos would work.. hmm..
08-21-2012, 02:00 PM
#188
FormerVendor
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08-21-2012, 02:12 PM
#189
Jim - Sorry! Indeed you have responded to the other PM's I've sent regarding the suitability and other aspects. I've settled on the 7675 though since these posts of yours (and the other respondents) have me salivating over the 7675. Besides my current hotside(log) was mocked up with a 7675 and my new hotside (tubular manifolds, ready later this year) is also mocked up using the 7675. Sorry if I seem impatient, but...well... I am 
Hahaha... Thanks for everything!
Dave
Hahaha... Thanks for everything!Dave
08-21-2012, 05:39 PM
#193
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INTMD8
great thread, good to see a ton of experience here
If you or anyone with the actual experience to help me spec a boosted twin would be VERY much appreciated
this will be going in a tube chassis car,with plent of room for cooling and layout starting with a stock LS7 crate motor running cats and a tuned factory ECU
looking for 1000 streetable and reliable crank hp running on 94 with the least amount of lag
this would need to make 900 or more at the back wheels
so....what do i need ?
including internally of course
i'll also point out this is a very real car
thanks for the help!
pabsy
great thread, good to see a ton of experience here
If you or anyone with the actual experience to help me spec a boosted twin would be VERY much appreciated
this will be going in a tube chassis car,with plent of room for cooling and layout starting with a stock LS7 crate motor running cats and a tuned factory ECU
looking for 1000 streetable and reliable crank hp running on 94 with the least amount of lag
this would need to make 900 or more at the back wheels
so....what do i need ?
including internally of coursei'll also point out this is a very real car
thanks for the help!
pabsy
Last edited by pabsy; 08-22-2012 at 01:54 PM.
08-21-2012, 09:25 PM
#194
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Way I've always told anyone going to a turbo setup. Is pick a hp goal. Cubic in. And there will be 8 different size turbos that will reach the goals. So then its how effective is each one and where in the powerband. If I want 1000 hp I could use a 76mm maxed out and get great low end but with terrible heat too much boost to make a number.step up to a 4788 and make the same power less boost less heat and still spool fast. Me personally I run a 88mm turbo on my 8 sec street s10. Blow through carb an e85. With a t6 1.32 exhaut housing. Its back pressure is very lo arround 1.1 at 15psi. With 9psi it goes 10.000 at 139 with 15 8.89 at 153 its a 3600 lb long bed full interior nd stereo. and soon to turn it up into the 20s. But at the same time id like to have a 91 94 or 101mm and run less boost and a more effective combo. Still at 9psi I'm running faster than most I've seen with a lighter car and a 76mm with more power on paper. I'm building my 1st turbo ls setup and my turbo choice will most likley be dual 76mm bb turbos.!
08-22-2012, 12:52 AM
#196
i know about the turbo jets, ive been working on turning a stock talon turbo into a small jet engine... just because
the small jet engines are neat lil buggers.
it sounds like Peugeot took the idea of a compound turbo set and managed to put it into a single turbo package.
i wonder what other "stock" turbos would work.. hmm..
the small jet engines are neat lil buggers.
it sounds like Peugeot took the idea of a compound turbo set and managed to put it into a single turbo package.
i wonder what other "stock" turbos would work.. hmm..
There are probably a bunch opf stock stuff that 'would' work. How well is another thing altogether. The probably with using stock stuff is nost engines over 2.5ltr will go twin turbo over single as most are V6 or bigger. So the market for turbos with large enough exhaust and compressors even for twins is relatively small. Im sat here now can cant think of any. Oh there was a Australian Ford that used a single Garrett GT40! They would make a nce set of twins!
Chris.
08-22-2012, 01:41 AM
#197
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compilation of a list of stock turbos that would make for good, fun, relatively powerful combinations for the 5.3 up to the 6.2 would make for a nice conversation. i would think that these days, diesel turbos should be looked at as well.
i now what u mean concerning the transition point for engine size and single turbo.
a twin GT40 setup would be a bit... large... for a stock 6.0L =p
i now what u mean concerning the transition point for engine size and single turbo.
a twin GT40 setup would be a bit... large... for a stock 6.0L =p
Last edited by Wnts2Go10O; 08-22-2012 at 01:51 AM.
08-22-2012, 03:47 AM
#198
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I'm surprised back pressure has only been mentioned once in here. It is something easily overlooked and would be the starting point of a bad build. I know alot of people preach it like Z28cobrakiller. I think TurboS10 hit it pretty good as far as what turbos work well with given cubes.
