need4speed. on that white rabbit turbo. you mentioned that the 18g doenst flow more than the big 16. however, those are both standard rotation turbos, the 16g that is available in the reverse rotation is actually smaller than the stage3 compressor wheel (a 15g from a td06 snail!!!). the 20g is still larger than that. the white rabbit's exducer is actaully a tiny bit larger than the 20g, but the inducer is a hair smaller, this allows for a better spoolup and less surging issues than the 20g. plus its a 5blade, which seems to keep the issues down as well. one of these days i will order one up and take a look at it.
jer, forced performance has them in stock ready to ship. they are like $320+shipping
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another thing jimmy, the srt4 compressor wheel is larger than the evo wheel. so unless you were to go with an evo9 compressor housing which has a larger a/r it wouldnt be worth it at all. by the time you add in the 10.5 you have already reached the "hahn 20g" price tag. go the 20g, its a bigger snail and will make more power
jer, forced performance has them in stock ready to ship. they are like $320+shipping
do you mean the (white rabbit) 18G-HR comp wheel?...I'm unure of it's source, but am guessing it's either a unique casting, or maybe is a TD06 18G wheel from some other use...maybe?
did a quick search on thier site, couldn't seem to locate it?...where did you find it?
on that white rabbit turbo. you mentioned that the 18g doenst flow more than the big 16. however, those are both standard rotation turbos, the 16g that is available in the reverse rotation is actually smaller than the stage3 compressor wheel (a 15g from a td06 snail!!!)
that's right...
...it was Dodgetweaker who revealed that the 15GK-HR compressor wheel (used in S3 CHRA) was sourced from a japan TD06 turbo diesel set-up...
...where as the 16G6-HR is a TD05 comp wheel...so the number doesn't indicate that one is larger than the other
given a back-to-back comparo, I think we'd see virtually identical performance numbers from an S3 with stock comp 15Gk wheel, and an S3 with the 16G6-HR wheel
i dont knwo if its directly a 18g...because it IS a reverse rotation as opposed to the standard 18g.
in order to get the specs, i had to call them and talk to them on the phone. i think its a unique casting, like the BR20g. but thats my guess. i didnt ask about that. it is available, they just dont like to advertise it. they make more by doing the whole swap...but they are a heck of a lot nicer than david and his crap.
be willing to be less, unless you pick up the a/r on the 16g by a bit. look at the inducer sizes in my sticky for an idea. a a/r change would help with that, but only one way to tell!!!!!
remember too, the stage3 manifold is brutal and KILLS power, get that fixed first
i dont knwo if its directly a 18g...because it IS a reverse rotation as opposed to the standard 18g.
in order to get the specs, i had to call them and talk to them on the phone. i think its a unique casting, like the BR20g. but thats my guess. i didnt ask about that. it is available, they just dont like to advertise it. they make more by doing the whole swap...but they are a heck of a lot nicer than david and his crap.
ya, i meant if was being sourced from some odd japan only 18G-HR (HR = reverse rotation) or something like that maybe??
...likely though it's thier own casting...they do the casting of buscher's 20G-5 blade comp wheel
be willing to be less, unless you pick up the a/r on the 16g by a bit. look at the inducer sizes in my sticky for an idea. a a/r change would help with that, but only one way to tell!!!!!
remember too, the stage3 manifold is brutal and KILLS power, get that fixed first
it'd be damn close...between them...but who knows till dyno compared?
...did you PNP your e-mani, or clip the turbine wheel at all?...i'm curious to know when you're hitting boost (rpm)?
i did heavily modify the mani, and ceramic coat it. im only running 16psi at the moment because i had injector issues. will be going to 25 this week. currently i hit 16psi bt 2500rpm. but teh AEM gain on the boost solinoid helps out too
when the 20G CHRA arrived, I was surprised to find it was atually a clipped turbine wheel...looks (guess-ta-mation) to be about 10-15 degree of so...
...my concern is of lag, but we'll see yet? ...I did a version of the DCR mod, and welded/PNP the ramp in...plus PNP of the manifold through out...next in the time remining is the ceramic coating...maxxfab 3" on the way...and AGP WGA...all on S3 control...
...I'm hoping the AGP will maybe help with some of the spool up (lag) and the ramp-mod also?!
actually I'd be happy with not as immediate spool up as standard S3...so a "bit" of lag wouldn't hurt...especialy once I start tuning the cams in
when the 20G CHRA arrived, I was surprised to find it was atually a clipped turbine wheel...looks (guess-ta-mation) to be about 10-15 degree of so...
...my concern is of lag, but we'll see yet? ...I did a version of the DCR mod, and welded/PNP the ramp in...plus PNP of the manifold through out...next in the time remining is the ceramic coating...maxxfab 3" on the way...and AGP WGA...all on S3 control...
...I'm hoping the AGP will maybe help with some of the spool up (lag) and the ramp-mod also?!
actually I'd be happy with not as immediate spool up as standard S3...so a "bit" of lag wouldn't hurt...especialy once I start tuning the cams in
ceramic or thermal coating to retain the heat (and resulting energy) inside the exiting exhaust stream, is certainly helpful, but not eh how equation...
...even with thermal coating of my past t3/t4, even a minor clip of the exhaust wheel, showed up as noticable lag
the more surface are you remove from the wheel, the less resistance (yes), but also less surface area for the gases to 'hit' against...
...we'll see soon enough how it goes (lag) with the install finished
Quote: Originally Posted by Tex
ceramic coating is key in keeping the spool up. extra heat in the manifold keeps the gas density low, which helps to spool the turbo up faster
yes, but that has to do with the clipping not the coating. the coating helps noteciably iff you compare before and after with the same wheels. but it does help pickup 200-300rpm
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