extremeracer

Hi guys

Im trying to establish what the maximum HP is you can pull out of my Turbonetics T66

The Compressor has a maximum mass flow rating of 66 lb/min = is it correct to say around 660 whp on a very eficient setup ??

What is the max HP flow the P trim can support before choking flow ???

Im currently @ 700 whp on a Dynapack Hub dyno - what was strange is that we changed to PRO 1 cams from Crower 63401T-2 cams and went to a true divided Turbo manifold and didn't pick up any real top end power !

Setup is a 84mm x 89mm LS Vtec ,
Ported B16A Head,
Turbonetics T66 P trim 0.70 A/R Divided
Victor X Intake Manifold
9.4:1 CR
Methanol
5000ft elevation

The midrange improved quite a bit. The motor made the same power @ 22 psi as it did @ 28 psi before the mods , but @ 28 psi it didn't make any more power than the old setup...

Is the Turbo maxed out ???
What are your thoughts on this ???

extremeracer

Any feedback.....???? - please

TheShodan

iTrader: (14)

You'll get another 40-50 or so, and that's about it. Time to upgrade.

extremeracer

Thank You for the reply !! What are your feelings on the Holset HX52 ??? I can get such a Turbo relatively cheaply compared to the Bullseye and Precision Billet offerings.

It has a 67mm/99mm comp wheel that flows 87 lb/min according to the "internet maps" and Holset's kg/s spec ! I could get the 71mm HX55 comp wheel (Pro 52) for even more flow if necessary. The turbine wheel is 72mm

Thnx again

TheShodan

iTrader: (14)

I haven't used the HX52 on a honda. They are considerably larger than a T67. It flows more air kg/sec, so, more power... but don't expect it to be responsive at all on our tiny engines.

extremeracer

Flow wise it looks close to a S372 and the turbine wheel and housing size is also in the same range ! Ive seen a S372 on a 2.0l GM engine come on boost hard from 5500 rpm, do you think this will be in the same range. The DSM guys claim that the Holsets spool really quickly for their size.

My thinking behind the HX52 is GT4294 like flow and possible spool @ a 1/3 of the cost.

There is a Honda on here making 420 whp @ 13 psi with a HX52 on a PRO 1, ported head 2.0l GSR ! And this isn't in the turbo's efficiency range yet - how do these numbers compare to GT42/S372 numbers ???

TheShodan

iTrader: (14)

Again, you're not going to see many direct comparisons on these sizes with a lot of turbo hondas. The exhaust wheels from the S372 and S372R are larger than the holset by about 18%. They are over 83.5mm, while the holset I believe is about 80mm. That exhaust wheel and larger volute of the S372 help that unit perform EXTREMELY well, and more than likely more efficiently than a Holset HX52. But again, give it a shot, try it out, and be a pioneer.

del_sol9310

Hey man first off i wanna apoligize if im breaking any of the rules, or if im cause any conflict commenting on your thread, in non response to your question. im new to the site. my bad. but i wannted to ask someone who actually has a built motor for the turbonetics t66. how does it run? boost lag? does it having pull in low gears? if you were to do it again would u use a differernt turbo? nd when your about to hit it on a roll, does the car get it!?!?!
the rason i ask is beacuse i gotta project goin and the route i was goin i needa a t66. then i found one, picked it up. and am a lil discouraged because everytime i try and look up info on it people are bashing the turbonetics t66 for honda use because "it takes a while to spool" and the list goes on. its hard to fin positives.acutally your the first post iv found thats not negative. so if you could tell me how it worked for you it would be greatly apprieciate it. if not i guess ill throw it on the ole 01 cummins. excpet everytime i look up info on that it comes back negative as well thanksss

TheShodan

iTrader: (14)

You can't expect much from over 80lbs/min on a sub 3 litre application to "spool well".. It won't. Most applications in B-series and K-series world takes about 5000-6000rpms to reach maximum pressures under 20psi. So yes. Laggy, unresponsive in low gears, but lots of top end peak power. So it works well for drag racing, and highway "death pulls", but not for anything responsive at all.

I don't even think its negative feedback. The turbo behaves the way it behaves because of what engine is attached too. If you're a full drag racer, response doesn't matter. If this is a street attack car, you'll hate the way it behaves.. Not sure what you're expecting here.

extremeracer

Quite surprised to see my old thread jump back up...

The T66 worked well for what it was, a non ball-bearing older tech turbo. We ran 153 mph with it, running 30psi on the drag car.

I then built a street car, also 84x89mm but with 9:1 CR, basic B16 head, stock intake manifold etc..with a Holset Super HX40 variant. The Holset had an equivalent sized turbine housing, slightly larger turbine wheel and spooled much faster than the T66.

The T66 would come on hard from about 5000rpm, if you bogged the car and rpm fell to just on 5000rpm, it would hesitate for a bit and then pick up. You have to take into account that we did run very large turbine housings on the T66 to pull the maximum HP potential out of the turbo - the last combo ran a 1.00 Divided housing with P-trim wheel. A 0.58 housing would help increase response a bit.

The Holset sees full boost @ 4500rpm and is delivering positive pressure from about 3000rpm - which makes it a great street turbo whilst still offering 600+whp potential

So there are better newer tech turbo's out there, which will give you better spool and a wider powerband, but as The Shodan says - there is no magic turbo that can make 650whp and offer no lag...