Garrett GT4088R with fitment issues
#26
Rotary Motoring
iTrader: (9)
Awesome data! Props to whoever did that back to back test because the difference is pretty clear. To me, I'd be a fool then to drop down to the .85 housing. No question that the smaller turbine housing would yield a more immediate feel to the throttle pedal, but it seems as though you're sacrificing power across the board. Not just in the top end, but in the mid-range as well.
This is because the dyno does not show elapsed time of the rpm sweep.
If the smaller AR housing turbo takes some milliseconds to hit full boost and the larger AR housing turbo takes over a second to hit full boost the smaller AR turbo will have been accelerating the vehicle at a higher rate and by the time the larger AR turbo is up to full boost the smaller AR one has been at full boost for a while and has dashed through several hundred more rpm where it is making more power than the larger AR turbo at full boost at its correspondingly lower rpm.
It is a balance and you have to size all aspects of the turbo for what you are doing with it.
1.45AR may be fastest at a drag race where you leave the line with boost from a 2-step and flat shift each gear.
The 1.05AR may be fastest in a roll on race or exiting corners on a tight road course.
#27
That's another excellent point! I hadn't considered the time factor for the rpms and power which makes a ton of sense. All the same, I think I will focus on optimizing the setup and reducing my lag through other means.
While I have the focus of so many brilliant minds (I'm being genuine here...you guys are huge wealths of knowledge) what do you think about a 2.5" inlet/outlet on the intercooler with 2.75" piping? I'd have to use reducers on the inlet and outlet as my output from my compressor housing is 2.75" and I believe the GReddy elbow is also 2.75"?
Should I go through the trouble of modifying my intercooler to accommodate the 2.75" piping, or just deal with the reducers and sacrifice a little bit of flow?
There will also be a slight uptick in velocity through the intercooler which I view as a bad thing as it would have less time to be cooled since it's speeding up on its way in and out. Maybe I'm reaching here...
Nick
While I have the focus of so many brilliant minds (I'm being genuine here...you guys are huge wealths of knowledge) what do you think about a 2.5" inlet/outlet on the intercooler with 2.75" piping? I'd have to use reducers on the inlet and outlet as my output from my compressor housing is 2.75" and I believe the GReddy elbow is also 2.75"?
Should I go through the trouble of modifying my intercooler to accommodate the 2.75" piping, or just deal with the reducers and sacrifice a little bit of flow?
There will also be a slight uptick in velocity through the intercooler which I view as a bad thing as it would have less time to be cooled since it's speeding up on its way in and out. Maybe I'm reaching here...
Nick
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KNONFS (07-24-17)
#29
Rotary Motoring
iTrader: (9)
what do you think about a 2.5" inlet/outlet on the intercooler with 2.75" piping
What I did is slowly step it up from the turbo to the throttle body.
My idea was that even though the intake is losing velocity from the friction of going though the intake piping it would also be continually expanding so it doesn't build up as much a head that the turbo has to push. Like the idea of megaphone exhaust piping I guess.
I did 2" turbo outlet to 2.25" IC pipe to 2.5" IC inlet to 2.75" IC outlet to 3" max inside the TB elbow.
#30
here's a pic of my engine compartment w the mica barrier
ceramic coating's biggest plus is it mitigates rust. don't look for significant heat reduction.
the current turbo on my car is a BW S300 SXE 62 w a .91 housing. i am going to run it max and then switch in a 1.0 to compare.
ceramic coating's biggest plus is it mitigates rust. don't look for significant heat reduction.
the current turbo on my car is a BW S300 SXE 62 w a .91 housing. i am going to run it max and then switch in a 1.0 to compare.
Sounds good to me.
What I did is slowly step it up from the turbo to the throttle body.
My idea was that even though the intake is losing velocity from the friction of going though the intake piping it would also be continually expanding so it doesn't build up as much a head that the turbo has to push. Like the idea of megaphone exhaust piping I guess.
I did 2" turbo outlet to 2.25" IC pipe to 2.5" IC inlet to 2.75" IC outlet to 3" max inside the TB elbow.
What I did is slowly step it up from the turbo to the throttle body.
My idea was that even though the intake is losing velocity from the friction of going though the intake piping it would also be continually expanding so it doesn't build up as much a head that the turbo has to push. Like the idea of megaphone exhaust piping I guess.
I did 2" turbo outlet to 2.25" IC pipe to 2.5" IC inlet to 2.75" IC outlet to 3" max inside the TB elbow.
My compressor housing has a 2.5" outlet but I've got one of those aluminum caps to make it 2.75". The piping is 2.75" down to the intercooler, where I'd have to use a reducer to 2.5" into the intercooler. It will then be 2.5" out of the intercooler with another reducer, bring it to 2.75" up to the throttle body essentially. It's a minor thing, but perhaps it'd be worth the trouble to have 2.75" pipe welded to the intercooler instead. My father in law can weld after all, but it will be a fair amount of work...
Nick
#31
My girl
iTrader: (3)
Let me know how you enjoy the 4088, I am running one as well with the 1.08 turbine housing and 4th gear is terrible with lag. Although once it gets going, it goes. Almost thought about going down to .95 as I want more road course type quickness, but recently did a track and stayed in 3rd most of the time. I had the ptp blanket and had to really really squeeze it between the intake and housing but it went with some tugs. Didn't need to do anything to the shock tower, this is the rx7store kit.
#32
Let me know how you enjoy the 4088, I am running one as well with the 1.08 turbine housing and 4th gear is terrible with lag. Although once it gets going, it goes. Almost thought about going down to .95 as I want more road course type quickness, but recently did a track and stayed in 3rd most of the time. I had the ptp blanket and had to really really squeeze it between the intake and housing but it went with some tugs. Didn't need to do anything to the shock tower, this is the rx7store kit.
Do do you have any pictures of your setup? I'm curious about how much space you have compared to me.
Nick
#34
Sponsor
iTrader: (41)
I've used these many times when there were clearance issues preventing the use of a heat blanket.
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https://www.designengineering.com//c...hesive-backing
https://www.designengineering.com//c...at-shroud-gold
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KNONFS (07-24-17)
#36
I just swapped out my USDM LIM for a JDM version which grants a bit more clearance due to its smaller EGR castings, and had it ceramic coated as well.
Howard, you will be pleased to know the Mica barrier is due to arrive today, so we'll see how it all comes together in the next couple days.
Nick
#39
I stand to be corrected, but that's how I view it.
Nick