Is 24 psi 24 psi?
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Is 24 psi 24 psi?
Hey all. Was just wondering if 24psi from my stock K04 is going to have the same power and torque as a ZFR at 24 psi. I know the ZFR is a bigger turbo and if I wanted a power increase in the future it could be on tap with a re-tune. But is it worth it with a 91 octane tune and trying to maintain engine life?
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Not even close to the same power levels. Your talking about the max safe zone for the K04 and a low psi tune for the ZFR... It's really only a measurement of restriction in that you could make the same/more power on 20 psi with the ZFR than you could at 24 on a K04... Get it?
#3
Zfr flows more air so no, zfr will make more power at 24 psi than k04
So k04 at 24 psi would flow 24 pounds per square inch of air at 32 lbs a minute and zfr would flow 24 psi at 54 lbs a minute. So both turbos compress the air the same, but zfr pushes that 24 psi into motor faster so u got more air in cylinder at 24 psi on zfr then u would on a k04 at the same psi
So k04 at 24 psi would flow 24 pounds per square inch of air at 32 lbs a minute and zfr would flow 24 psi at 54 lbs a minute. So both turbos compress the air the same, but zfr pushes that 24 psi into motor faster so u got more air in cylinder at 24 psi on zfr then u would on a k04 at the same psi
Last edited by tomj77; 03-20-2014 at 10:46 PM.
#6
See that's not true. Psi does mean something. If u had 54 lbs/ minute going into the motor at 1 psi ud make less power than at 24 psi. U compress the air charge more it holds more oxygen than when u compress it less. So obviously it means something. I think the better thing to say is psi or airflow by themselves mean nothing, u have to look at both really.
#8
Zfr at 24 psi will be motor safe, but not trannysafe, due to it makes a lot more torque very quickly at low rpm, almost like pretty much as fast as with stock turbo , so all that power coming on with stock tranny and 3rd gear go boom. Gotta tune so torque doesn't come on so quick or even better, get a Powell 4.45 gear tranny upgrade like gonna have to lol
#16
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My head sort of hurts after reading those responses.
PSI is basically a measure of the head loss in your piping system. The head loss is a function of the density of the air and the restrictions in your system. Two turbos boosting 24 psi just means that the head loss between the two is the same. The flow rates are different because one turbo might be more effient than the other in that range, meaning the charged air is less hot (more dense).
PSI is basically a measure of the head loss in your piping system. The head loss is a function of the density of the air and the restrictions in your system. Two turbos boosting 24 psi just means that the head loss between the two is the same. The flow rates are different because one turbo might be more effient than the other in that range, meaning the charged air is less hot (more dense).
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