15psi on Greddy vs 15psi on JWT
05-30-2008, 08:00 PM
#1
15psi on Greddy vs 15psi on JWT
I searched for this topic, but i could not find any answers. In essence, this is more of a question to help me understand the differences in the turbo's used in each system, as opposed to "should i get this kit vs. this kit", which seems to be the prevalent topic.
People will remember the thread "sweet spot for jwt530", in particular this post:
https://my350z.com/forum/showpost.ph...92&postcount=8
Here's my question:
At 15psi, would the Greddy kit and the JWT kit make the same amount of power (assuming all other things are equal-ECU, fuel system, internals, etc etc etc)? If not, why would there be a difference between the turbos at those settings? I understand that you cannot run a 530bb outside of 15psi due to the efficiency, but i would like to gain an understanding as to how the efficiency of the turbo helps in producing power.
If i did not search thoroughly enough, please feel free to lock the thread.
People will remember the thread "sweet spot for jwt530", in particular this post:
https://my350z.com/forum/showpost.ph...92&postcount=8
Here's my question:
At 15psi, would the Greddy kit and the JWT kit make the same amount of power (assuming all other things are equal-ECU, fuel system, internals, etc etc etc)? If not, why would there be a difference between the turbos at those settings? I understand that you cannot run a 530bb outside of 15psi due to the efficiency, but i would like to gain an understanding as to how the efficiency of the turbo helps in producing power.
If i did not search thoroughly enough, please feel free to lock the thread.
05-30-2008, 08:23 PM
#2
It's my understanding that the JWT turbos are rated by their power output, so a 530 should not be making more than somewhere in the mid 500's in whp. The Greddy kit, even with the basic 18g turbos included have been pushed to 600 or more. There is also the 20g upgrade, but have heard of the reliavlility issues with those. The JWT also offers the 700 and 850 kits. The power bands change some with the larger turbos.
05-30-2008, 09:10 PM
#7
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Originally Posted by Robert_K
Garrett Turbos > Mitsushiti. 
Trending Topics
05-30-2008, 09:54 PM
#8
Originally Posted by jumpin800agl
FIAL. Greddy> Robert K. /thread.
Sorry but, IMO... JWT > APS > VorTech > Greddy. 
Originally Posted by IIQuickSilverII
it should be, but regardless the way the 18gs have performed very well on many gretty TT builds with very few cases of actual failure on the turbos, and also puts out good numbers when maxed out
Glad I did. 
All three kits are great kits. It just comes down to personal preference.
05-30-2008, 10:10 PM
#9
Originally Posted by usingthejohn
...
At 15psi, would the Greddy kit and the JWT kit make the same amount of power (assuming all other things are equal-ECU, fuel system, internals, etc etc etc)?
At 15psi, would the Greddy kit and the JWT kit make the same amount of power (assuming all other things are equal-ECU, fuel system, internals, etc etc etc)?
Originally Posted by usingthejohn
If not, why would there be a difference between the turbos at those settings? I understand that you cannot run a 530bb outside of 15psi due to the efficiency, but i would like to gain an understanding as to how the efficiency of the turbo helps in producing power.
If i did not search thoroughly enough, please feel free to lock the thread.
If i did not search thoroughly enough, please feel free to lock the thread.
The ideal gas law gives us the equation: PV=nRT. If you change out turbos in the exact same car, the volume is the same, you run at the same PSI so the pressure is the same. R is a constant. Only thing left in the equation is n and T (moles of the gas and temperature). So only those two things change when swapping turbos. Higher temps * less oxygen of a small turbo = Lower temps * more oxygen of a larger turbo
Last edited by rcdash; 05-30-2008 at 10:18 PM.
05-30-2008, 10:16 PM
#10
Originally Posted by Robert_K
Sorry but, IMO... JWT > APS > VorTech > Greddy. .
in a real world senario Greddy > APS > JWT > Vortech
Greddy - old a$$ turbo's that shouldn't perform no where near the others.. but for some reason it spools faster than the APS Kit and puts out more power.. it also spools around the same RPM as the JWT 530 Kit and will still put out 200 whp more on the same kit without upgrading turbo's..
APS - very well put together kit that fit and finish is top notch, however the warranty on them suck and they spool later than the Greddy and still don't make as much maximum power on the standard kits..
JWT - decent kit.. but doesn't make enough power as the APS or Greddy..
Vortech - ?!?!?!?!? wtf are you comparing an SC kit with Twin Turbo Kits.. now i know you have no damn sense
05-30-2008, 10:18 PM
#11
I don't think the GT25 and/or the GT28 is comparable to the 18g. If you want fast spooling (around 2500-2800 rpms), instant low-end torque with around 380-400whp get the 530 kit. The GT28's (700 kit) spool about 300-500rpms later, still instant torque w/ around 450whp. I can't comment on the 18g actual numbers but from my understanding they're a bit more laggy the the GT25/GT28's and produce awesome high-end peak HP number. Also running 15psi of boost I hope you've planned for a built motor.
05-30-2008, 10:23 PM
#12
Originally Posted by doug
well its a damn good thing your opinion doesn't mean **** around here..
in a real world senario Greddy > APS > JWT > Vortech
Greddy - old a$$ turbo's that shouldn't perform no where near the others.. but for some reason it spools faster than the APS Kit and puts out more power.. it also spools around the same RPM as the JWT 530 Kit and will still put out 200 whp more on the same kit without upgrading turbo's..
APS - very well put together kit that fit and finish is top notch, however the warranty on them suck and they spool later than the Greddy and still don't make as much maximum power on the standard kits..
JWT - decent kit.. but doesn't make enough power as the APS or Greddy..
Vortech - ?!?!?!?!? wtf are you comparing an SC kit with Twin Turbo Kits.. now i know you have no damn sense
in a real world senario Greddy > APS > JWT > Vortech
Greddy - old a$$ turbo's that shouldn't perform no where near the others.. but for some reason it spools faster than the APS Kit and puts out more power.. it also spools around the same RPM as the JWT 530 Kit and will still put out 200 whp more on the same kit without upgrading turbo's..
APS - very well put together kit that fit and finish is top notch, however the warranty on them suck and they spool later than the Greddy and still don't make as much maximum power on the standard kits..
JWT - decent kit.. but doesn't make enough power as the APS or Greddy..
Vortech - ?!?!?!?!? wtf are you comparing an SC kit with Twin Turbo Kits.. now i know you have no damn sense
You nailed on the head with the Greddy... OLD!!! & garbage. Greddy is flat out junk! Greddy USA is NOT Trust like everyone think it is. Greddy has turn into e-bay level products.
APS... Biggest joke of a kit. I've read more problem with the APS that any other F/I kit out there.
JWT... You right Decent kit that WORKS!
Also not eveyone needs dyno queen numbers. I like useable power. Anything over 500whp is pointless.
[/end]
Oh And heaven forbid someone has an opinon that is different from Doug.
Cause if you don't agree with Doug... You're Wrong!
Last edited by Robert_K; 05-30-2008 at 10:25 PM.
05-30-2008, 10:24 PM
#13
Peak power: Greddy 20 > Greddy 18 > APS ~ JWT 700 > JWT 530
Spool is inverse of peak power, but the Greddy is something special because although it spools a little later than the APS/700bb it seems to get to full boost just as quickly. I still don't understand what trick they've got in there to allow that non-ball bearing turbo to spool up so quickly.
Spool is inverse of peak power, but the Greddy is something special because although it spools a little later than the APS/700bb it seems to get to full boost just as quickly. I still don't understand what trick they've got in there to allow that non-ball bearing turbo to spool up so quickly.
05-31-2008, 06:45 AM
#16
Originally Posted by rcdash
Peak power: Greddy 20 > Greddy 18 > APS ~ JWT 700 > JWT 530
Spool is inverse of peak power, but the Greddy is something special because although it spools a little later than the APS/700bb it seems to get to full boost just as quickly. I still don't understand what trick they've got in there to allow that non-ball bearing turbo to spool up so quickly.
Spool is inverse of peak power, but the Greddy is something special because although it spools a little later than the APS/700bb it seems to get to full boost just as quickly. I still don't understand what trick they've got in there to allow that non-ball bearing turbo to spool up so quickly.
thats the great thing about greddy.. they are suppose to be old and decriped for non-BB turbo's but they are giving the BB turbo's a run for their money.. on spool time and peak power
05-31-2008, 06:54 AM
#19
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Originally Posted by doug
fact: i'm off to a wedding to take pictures.. i'm sure this thread will blow up in my absense.. i hope my greddy brothers can keep the 'lamp' lit while i am away
05-31-2008, 07:11 AM
#20
Originally Posted by Zivman
Let's just say if we met in person I doubt you would be calling me a punk to my face. Why don't you 'man up', log off, and a take a breather for a few minutes and collect yourself.
I think differently if we met. And to be honest me leaving to collect myself is advice I might take from you. One thing should never be brought up on ANY forum is someone's spouse/family.