Precision Billet Turbos

[Ðemons]

Good ? on comp Ratio as it hasnt been tested since the built to be honest it has sat in the shed for 3 years with doing nothing. It comes out sometimes & getz fair up it down this road I know quite well. Head work ported Polished supertech vavles. It made 450KW with the HKS To4Z strapped to the side of it with race Fuel 23psi.

[Ryan1200]

Twin scroll ryan 4inch inlet & 3inch out from memory. Has 3.5 inch exhaust but not that thats going to matter its coming straight out of gate so should sound the goods lol.

Cool can't wait to see your results trying to decide whether the 6766 is going to be too small for my new 3.2L thats in the build ATM

[Piggaz]

Cool can't wait to see your results trying to decide whether the 6766 is going to be too small for my new 3.2L thats in the build ATM

LOL. What's the "goal figures" in mind?

[Ryan1200]

1000 flywheel hp or as close as I can't get with good spool

Edited April 3, 2013 by Ryan1200

[Ryan1200]

Should say ok spool I guess

[SiR_RB]

the ported or "s" cover is 4" in and 2.5"

whens it going to Jezs mate?

[SimonR32]

Going on a roller (dyno dynamics) tomorrow... Ewwww

I'll try and get a run on current tune with same fueling to see roller vs hubber before we play with boost

[Lithium]

1000 flywheel hp or as close as I can't get with good spool

What fuel? If on E85 then the Precision PT6466 seems to be the man for shooting in that area - basically every result I've seen for that turbo have been exceptional "for what it is". PT6766 CEA will do it and with a bit of change and a bit more lag, Forced Performance GT3794HTA is not a Precision turbo but I reckon from what I've seen makes me think they have a compressor map more suited to RBs (and 2JZs) - a little wider flow in the 30-40psi boost range (the Precisions definitely need more boost to make these power levels), and they sound awesome. A SLIGHT (ie 100 or so rpm) bit more lag than the two Precision turbos though.

[34GeeTeeTee]

Going on a roller (dyno dynamics) tomorrow... Ewwww

I'll try and get a run on current tune with same fueling to see roller vs hubber before we play with boost

Awesome

[33GTRV]

hopefully my shartbox goes in on the 19th to get a run in tune. Rb28 and 6466 with jew brew. Big shout out to piggaz again for helping me with a rail

[Lithium]

Awesome

+1 actually, I've been treating the difference between these two as ~11% (so 600hp @ hubs = 534whp/399rwkw) so will be interesting to see how close this is.

[Ryan1200]

After seeing that evo data you posted Lith i been tossing up between those 2 67mm but the redesign higher flowing exhaust wheel on PT made sense when dealing with my capacity. Its going on E85 and around 9.2:1 comp.

[SimonR32]

+1 actually, I've been treating the difference between these two as ~11% (so 600hp @ hubs = 534whp/399rwkw) so will be interesting to see how close this is.

There used to be a fairly well proven 7-8% difference between the hub dyno and a roller, we could repeat it every time.

The hub dyno we use has now been updated with new software and corrections (the 600hp run was done with this) and they are meant to read similar now.

[Lithium]

Ahh cool, good to know - I had partly based that number off what SAU people insisted when comparing hub dynos and otherwise but have been starting to get suspicious after seeing trap speeds of cars run on DD being much closer to cars with similar Dynapack numbers (ie, my own) but had used that partly because of avoiding angsty Aussies complaining about inflated numbers

Keen to hear the results anyway, especially when you nudge the boost up!

[34GeeTeeTee]

Yeah it will be great to see a real comparison... I guess the trap speed is a good indication anyway but i am looking forward to the results!

[SimonR32]

Well that was a bit of a fail, there is an issue with the dyno and even with 4wd set to 50/50 torque split the thing was doing burnouts as soon as it came on boost...

Ended up going 560hp but started spinning at 550hp and pretty much flat lined from there. Would have been well over 600awhp on 24psi if it had traction

Edited April 4, 2013 by SimonR32

[Frosty]

Well that was a bit of a fail, there is an issue with the dyno and even with 4wd set to 50/50 torque split the thing was doing burnouts as soon as it came on boost...

Ended up going 560hp but started spinning at 550hp and pretty much flat lined from there. Would have been well over 600awhp on 24psi if it had traction

put 20 fat kids in the back! dont comment until we have results!!!

this is still with the 6262 yeah simon?

[SimonR32]

put 20 fat kids in the back! dont comment until we have results!!!

this is still with the 6262 yeah simon?

No access to 20 fat kids so it'll have to do. The power was almost ramping vertically when it started spinning and then hovered around 550awhp from 5500-8500.

Yeah 6262 T4 divided 0.8 rear

[Frosty]

nice...you have a graph? im thinking of throwing a 6266 on RB25 for sh*ts and giggles

[Lithium]

"Dyno can't hold the power" = third world problems of car modifying. Nice work