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Old 05-28-2011, 01:40 AM   #1
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Default Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

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

Click the image to open in full size.

Red line= Precision 67/65 journal bearing
Blue line= Turbonetics-HPC 64/65 Ball Bearing
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Old 05-28-2011, 02:11 AM   #2
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

Should have used the .81 on both turbos. I believe they are interchangeable? I just picked up one for a customers car, good to see some number since I havent seen anyone else using these.
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Old 05-28-2011, 02:14 AM   #3
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

i did a back to back previously with the 67 with both rear housings...spool was even worse... no point comparing the 64 to that...
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Old 05-28-2011, 02:16 AM   #4
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

i did a stock bore/stroke b16 back in december with the 64/68. made 800hp on 36psi
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Old 05-28-2011, 02:25 AM   #5
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

Good to know. Thanks for the comparison. Might have to try one of these 6465 in my own car.
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Old 05-28-2011, 06:36 AM   #6
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

Nice comparison, probably 100whp sitting on the table with a good cam swap, shame such a setup has the most horrible cam available in it.
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Old 05-28-2011, 06:41 AM   #7
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

interesting, thanks for the comparison
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Old 05-28-2011, 06:27 PM   #8
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

nice comparison. what would change at higher hp levels? is this the billet turbonetics? i was trying to find it on their website
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Old 05-28-2011, 08:02 PM   #9
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

yeah its the billet Turbonetics... hard to say on higher boost levels, but i have made 850hp on the 64 before so i dont see it falling off too much compared to the 67 on higher boost
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Old 05-29-2011, 12:52 PM   #10
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

if the precision was a ball bearing turbo like the turbonetics one that would have made for more of a fair comparison as well... still interesting
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Old 05-29-2011, 03:06 PM   #11
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Default Re: Precision 67/65 vs Turbonetics-HPC 64/65 Dyno

a lot of things could have made it more fair... same housings..bb..etc.. but these are the turbos i had. point was to show that the billet 64 is a very capable turbo
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