Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

[AutoMods]

more info here http://honda-tech.com/showthread.php?t=2940852


I've used both of these turbos on a lot of high HP car but havent had a chance to do both of them back to back.. here is a car that i finished up tonight on relatively low boost..

setup:
84x89 lsvtec
9.5 to 1 compression je pistons
eagle rods
stock port b16 head
stock b16 cams
Victorx intake
open T4 topmount
precsion 750 intercooler
E85
S300

67/65 is journal bearing with a .68 back housing
64/65 is ball bearing with a .81 back housing

both are on 18 psi

http://i883.photobucket.com/albums/ac33/hpcraceparts/249918_227241310635926_100000501758906_996507_6624 918_n.jpg


Red line= Precision 67/65 journal bearing
Blue line= Turbonetics-HPC 64/65 Ball Bearing

[Xboosted23X]

I wouldn't call this a even comparison. Of course a smaller bb turbo will do better even with a bigger hotside.

[derek072887]

He is getting at the fact that the journal is so close to the BB even though its bigger

[AutoMods]

i'm not really implying anything. take it for what it is, its interesting to look at but there are 3 variables that are different (compressor wheels, bearing design , turbine a/r) so its hard to say what turbo is more efficient. but at this power level the turbonetics is the better setup with quicker spool and a bit more top end.

ball bearing only helps spool, not max power. you could give the pte the larger matching .81 a/r to make it fair but it will most likely fall further behind on the spool.

The turbonetics unit only cost $125 extra over the pte with the bb and billet options.

[Domestic Disturbance]

For some reason I just assumed you were posting an ls engine without reading anything. Then I saw the tq and was like ok wtf.

[slow ride]

Ball bearing doesn't do THAT much for spool. I'd say the smaller hotside should have given the 67 a spool advangage or at least even. To bad they didn't try both turbos with each housing as I think they would have bolted up.