My new 3.6 Turbo upgrade / engine mod path
05-30-2007, 02:26 PM
#17
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Originally Posted by eyue
I would like to know the difference between our stock turbo and the HFS. Can you really feel the difference ?
05-30-2007, 02:49 PM
#19
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Thread Starter
"The rest of the mods are more like putting lipstick on a pig (the pig being CIS)."..
hahaha.. CIS, yeah that's unfortunate.
The ball-bearing turbo should only affect spool up time and not increase airflow mass. 1 bar of boost is 1 bar of boost, regardless of turbo.
Now, how fast & efficient you get to 1 bar of boost is dependent on exhaust system, turbo spool, and intake efficiencies.
Seems like with these CIS engines delivering enough metered fuel is the core issue.
My car doesn't have a CAT. A wideband O2 sensor is going on. I might even get to use that independent knock sensor system I have... everything tuck away in the glove box or something.. I don't like the bling gauges everywhere.
Since our cars have a mechicanal fuel injection system.. what does the existing stock O2 sensor control?
hahaha.. CIS, yeah that's unfortunate.
The ball-bearing turbo should only affect spool up time and not increase airflow mass. 1 bar of boost is 1 bar of boost, regardless of turbo.
Now, how fast & efficient you get to 1 bar of boost is dependent on exhaust system, turbo spool, and intake efficiencies.
Seems like with these CIS engines delivering enough metered fuel is the core issue.
My car doesn't have a CAT. A wideband O2 sensor is going on. I might even get to use that independent knock sensor system I have... everything tuck away in the glove box or something.. I don't like the bling gauges everywhere.
Since our cars have a mechicanal fuel injection system.. what does the existing stock O2 sensor control?
05-31-2007, 12:25 AM
#21
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Originally Posted by sl951
"The ball-bearing turbo should only affect spool up time and not increase airflow mass. 1 bar of boost is 1 bar of boost, regardless of turbo.
The volume of air my GT35R puts out at 1 bar is many times more than my K27HFS did at 1 bar. So 1 bar is reletive to pressure not volume of air.
05-31-2007, 11:37 AM
#22
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The volume of air my GT35R puts out at 1 bar is many times more than my K27HFS did at 1 bar. So 1 bar is relative to pressure not volume of air.
PV=nRT
In the case of flow, the equation becomes:
V/t = [(n/t)*(RT)]/P
where V/t is the volume of air per unit time (flowrate) and n/t is the mass (moles) of oxygen moving through the system per unit time. At constant pressure (1 bar) a higher flowrate (V/t) delivers more oxygen per unit time (n/t) to the engine.
05-31-2007, 05:52 PM
#23
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Thread Starter
You guys are correct, from a mass flow perspective on turbo efficiencies.
I was commenting on the same turbo compressor efficiency with a ball-bearing instead of bushing.. (think K-27 with BB).
I was commenting on the same turbo compressor efficiency with a ball-bearing instead of bushing.. (think K-27 with BB).
06-01-2007, 12:06 AM
#24
Rennlist Member
Some Questions ......any body?
When using a GT35 R how do you cool it ? do you run oil through the water bearing jacket?
Also what size oil restrictor is used to prevent seal blowout from too much Oil?
When using a GT35 R how do you cool it ? do you run oil through the water bearing jacket?
Also what size oil restrictor is used to prevent seal blowout from too much Oil?
????
06-01-2007, 04:09 AM
#26
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Thread Starter
Originally Posted by Turbohead
Some Questions ......any body?
When using a GT35 R how do you cool it ? do you run oil through the water bearing jacket?
Also what size oil restrictor is used to prevent seal blowout from too much Oil?
When using a GT35 R how do you cool it ? do you run oil through the water bearing jacket?
Also what size oil restrictor is used to prevent seal blowout from too much Oil?
Atleast on the 944 Turbo side.. we run anywhere from 40-70 thou hole oil restrictors. Basically an allen key plug with hole drilled through it, seems to work well.
09-22-2018, 02:35 PM
#27
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Is the gt35r the best option if throttle response and low and mid range power is more important than max hp.?
Yes of course flow will help everything but if you had a choice of any what is best?
Yes of course flow will help everything but if you had a choice of any what is best?
10-18-2018, 08:53 AM
#28
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This is a strange subject. The PET says we have 964 N/A cams some engine builders disagree. Nobody has been able to verify or confirm other than their word. I know of 3 reputable shops that I trust that insist the lift and duration is different and 3 others, also reputable that claim their the same.
Someone needs to measure and compare.
Wish I could help more but Elliot has been through this recently.
I was told there is an EVO came that is supposed to be very nice but have no info either, although I believe that is used with EFI conversions.
Someone needs to measure and compare.
Wish I could help more but Elliot has been through this recently.
I was told there is an EVO came that is supposed to be very nice but have no info either, although I believe that is used with EFI conversions.
In PET you wont find the S Spec, but you can check Flachbau.com
I build some of These 3,3 and 3,6 engines and go for the cams with a 7006 Turbo like the S cars.
Regards
