LR Super 75-10
#16
The LR Super 75 uses a T70 compressor wheel.
With a #8 hotside and 20psi of boost it won't be too bad to drive but under full load backpressure will be immense and EGT will explode, and that is with a 2.5 engine already.
Thinking of a #8 hotside on a 3.0 would be asking for further trouble, unless coupling it with a compressor so tiny that it would question the point of building a 3.0.
With a #8 hotside and 20psi of boost it won't be too bad to drive but under full load backpressure will be immense and EGT will explode, and that is with a 2.5 engine already.
Thinking of a #8 hotside on a 3.0 would be asking for further trouble, unless coupling it with a compressor so tiny that it would question the point of building a 3.0.
#17
#18
Thread Starter
Drifting
Is a T70 wheel 67mm ?, I'd agree a #8 hotside with that coldside doesn't add up on a 3.0 though I've read the replica hotsides are bigger than the original KKK's. It's obvious the 75 is biased towards top end but people that are using them seem to be saying there's enough boost from 4k to make them viable.
#19
Is a T70 wheel 67mm ?, I'd agree a #8 hotside with that coldside doesn't add up on a 3.0 though I've read the replica hotsides are bigger than the original KKK's. It's obvious the 75 is biased towards top end but people that are using them seem to be saying there's enough boost from 4k to make them viable.
In the first post, there is a side by side comparison of the lindsey racing "8"hotside next to a K26/8
#20
Is a T70 wheel 67mm ?, I'd agree a #8 hotside with that coldside doesn't add up on a 3.0 though I've read the replica hotsides are bigger than the original KKK's. It's obvious the 75 is biased towards top end but people that are using them seem to be saying there's enough boost from 4k to make them viable.
#21
Thread Starter
Drifting
#25
The LR Super 75 uses a T70 compressor wheel.
With a #8 hotside and 20psi of boost it won't be too bad to drive but under full load backpressure will be immense and EGT will explode, and that is with a 2.5 engine already.
Thinking of a #8 hotside on a 3.0 would be asking for further trouble, unless coupling it with a compressor so tiny that it would question the point of building a 3.0.
With a #8 hotside and 20psi of boost it won't be too bad to drive but under full load backpressure will be immense and EGT will explode, and that is with a 2.5 engine already.
Thinking of a #8 hotside on a 3.0 would be asking for further trouble, unless coupling it with a compressor so tiny that it would question the point of building a 3.0.
#26
Well yes Nick... I must say I wasn't thinking of your experience when I made that comment, just thinking about what Sly has been seeing.
I suppose your better JME cam made the back pressure issue more evident on your engine than it did on mine with the NA cam? Hard to say...
My other friend with the 444bhp engine uses an #8 KKK hotside but with a modern Borg Warner turbine wheel and sees no more than 2.0 bar of back pressure, so maybe the stock housing can still be kept if used with such a turbine wheel.
I suppose your better JME cam made the back pressure issue more evident on your engine than it did on mine with the NA cam? Hard to say...
My other friend with the 444bhp engine uses an #8 KKK hotside but with a modern Borg Warner turbine wheel and sees no more than 2.0 bar of back pressure, so maybe the stock housing can still be kept if used with such a turbine wheel.
#27
Well I guess if I fit the number 10 housing and nothing changes except slower spool then at least we will know the housing is not the blockage. I also agree that the JME cam should in theory exaggerate any back pressure issues.....
#28
We were almost going to measure backpressure with Sly on Sunday but got lazy and just drove off onto the Autobahn, but even from the passenger side the back pressure felt pretty obvious when going full load at high speed. It felt nowhere near as bad on my (even larger) engine with your turbo and I never had HG issues in the same condition, at least issues that were not already present.
Would be interesting to see pics of the "tongue area" between the two housings when you can make some, I never had a close look at those KKK replica housings.
Would be interesting to see pics of the "tongue area" between the two housings when you can make some, I never had a close look at those KKK replica housings.
#29
I'm running the super 75 on my 3.0 .68a/r p-trim T4. I don't see any back pressure in my gauge tied into the test port on the cross over pipe. I'm sure u have seen pics of my exhaust I've posted. I see full boost by 3800. Not stock cam either.
Edit : Hot side is a V-band not 4 bolt different than #8 or #10
Edit : Hot side is a V-band not 4 bolt different than #8 or #10
Last edited by gruhsy; 12-17-2013 at 09:59 PM.
#30
what about a stage 5 turbine?
I have a stage 5 in mine with a #8 housing. I am running a GT35R wheel (56 trim) in a T04E compressor housing measuring .60 a/r. I love my spool in mine.
but this is still a 2.5 in mine, not the 3.0 like he is toying with.
I just think the stage 3 will be too small for the 3.0.
I have a stage 5 in mine with a #8 housing. I am running a GT35R wheel (56 trim) in a T04E compressor housing measuring .60 a/r. I love my spool in mine.
but this is still a 2.5 in mine, not the 3.0 like he is toying with.
I just think the stage 3 will be too small for the 3.0.