UPDATED!!*DYNO NUMBERS* Comparison of Comp Turbo Billet 88mm CT6X-88 & GT91 Garrett!!
08-29-2012, 06:23 PM
#242
Well, i decided to install the 1.08 housing to see how it felt. spools great, and sounds amazing! The spooling sound is like a 18 wheeler! the BOV sounds much stronger too. My friend who has seen the car through every change, said it never felt or sounded better. I was able to get it up to 16psi on the street (trying to avoid cops)
Best of all, BP is down to 2:1, same as the original! I havent decided if i should try the 1.23 housing to bring it down a tiny bit more. Maybe I should just dyno with the current housing and see how it goes?
Best of all, BP is down to 2:1, same as the original! I havent decided if i should try the 1.23 housing to bring it down a tiny bit more. Maybe I should just dyno with the current housing and see how it goes?
08-29-2012, 06:36 PM
#245
This is why im contemplating the 1.23 a/r. It feels great now, just wondering if i'd unlock any more power with the other housing up in the higher RPM range
08-29-2012, 07:21 PM
#248
So they machined all the spare exhaust housings to fit the new wheel already?
If youtake it apart to try a different housing please take some pics and measurements of that turbine, please
If youtake it apart to try a different housing please take some pics and measurements of that turbine, please
08-29-2012, 07:25 PM
#249
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Pop the other housing on there that bp should drop a good bit. I would not be surprised if it actually spools even better. So when is dyno day....haha
How does this feel vs the GT91 you had before? Do you think the power is similar? What about the spool?
How does this feel vs the GT91 you had before? Do you think the power is similar? What about the spool?
08-29-2012, 07:32 PM
#251
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Isn't 2:1 backpressure a pretty decent ratio? 2:1 seems pretty common on singled Supras.
As noted earlier, a large A/R often kills spool and adds very little to nothing on the top end. Sound Performance tested a variety of A/Rs on a 6265 and the results were that a .81 A/R made the most power and spooled the fastest vs larger A/R housings.
I would test out the 1.23 and see what it does. Back to back dynos of the two housings would be really great.
As noted earlier, a large A/R often kills spool and adds very little to nothing on the top end. Sound Performance tested a variety of A/Rs on a 6265 and the results were that a .81 A/R made the most power and spooled the fastest vs larger A/R housings.
I would test out the 1.23 and see what it does. Back to back dynos of the two housings would be really great.
08-29-2012, 07:38 PM
#252
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I think i'm gonna ask for the exact same turbo for my stock cube lq9 with a tighter .90ar t6 housing. Should be good! If it spools a little later than i want, i'll throw a quick spool valve on it. Get that dyno day set-up asap! :-)
08-29-2012, 07:51 PM
#254
its a 408. CNC'd heads w/ pro-flo XT manifold
Isn't 2:1 backpressure a pretty decent ratio? 2:1 seems pretty common on singled Supras.
As noted earlier, a large A/R often kills spool and adds very little to nothing on the top end. Sound Performance tested a variety of A/Rs on a 6265 and the results were that a .81 A/R made the most power and spooled the fastest vs larger A/R housings.
I would test out the 1.23 and see what it does. Back to back dynos of the two housings would be really great.
As noted earlier, a large A/R often kills spool and adds very little to nothing on the top end. Sound Performance tested a variety of A/Rs on a 6265 and the results were that a .81 A/R made the most power and spooled the fastest vs larger A/R housings.
I would test out the 1.23 and see what it does. Back to back dynos of the two housings would be really great.
08-29-2012, 07:55 PM
#255
just weighed mine. 37lbs with a T6 1.39a/r housing on it. Most of the weight is the turbine housing...
and yes the comp is solid billet aluminum center section/backing plate is all the same piece of aluminum. Its pretty amazing
and yes the comp is solid billet aluminum center section/backing plate is all the same piece of aluminum. Its pretty amazing
Last edited by KILLER-LS1; 09-05-2012 at 06:31 PM.
08-29-2012, 08:09 PM
#258
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Sounds to me like the GT91 is the old reliable work horse, when in doubt go with a GT91, this new turbo sounds like it has lots of potential just needs more people with a understanding of turbos to run them and help work out the correct combinations to order for the LS crowd.
08-29-2012, 08:12 PM
#259
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Here's an apples to oranges comparison for ya.
Twin HP7668's at 20psi with a 0.81AR with 1.54 : 1 backpressure ran 161mph at 3850lbs.
Added twin 0.96AR housings and picked up 3-4 mph at the same boost and spooled the same. Did not get a BP reading on the 96's.
Even under 1.5 : 1 there is power in lower back pressure.
Twin HP7668's at 20psi with a 0.81AR with 1.54 : 1 backpressure ran 161mph at 3850lbs.
Added twin 0.96AR housings and picked up 3-4 mph at the same boost and spooled the same. Did not get a BP reading on the 96's.
Even under 1.5 : 1 there is power in lower back pressure.