Turbo question about PSI and turbo size

[ChiGGz]

Say im running a SCM50 at 15 PSI and im running the stock turbo @ 15psi also...
Are these two turbos going to provide the same gains (provided everything else is the same for the sake of comparison.)

How much performance gain can you expect from an additional PSI? And what do xxlb have to do with the turbo?

My apologies, im learning

 

[theSicKness]

well depending on what year car you have it could be a huge gain even if both are running at 15 psi.... a stock t25 will run at 15 psi but a lower cfm i belive its around 300 and some i could be wrong....but lets say a t28 which is a bigger turbo could run at 550 cfm at 15psi.... and that is a big diffrence.......


http://www.dsmtuner.com/forums/showthread.php?t=107653&highlight=cfm?

this will tell u in detail about a turbo

 

[ChiGGz]

Thanks for your insight and the link

Is CFM related to xxlbs something something?
Is an additional 1 PSI of boost significant? (i know it may be mod dependent, but lets base this on a decently modded car capable of running 350 WHP)

Also might I ask, 14b, 16G, 20G...are these general sizes? Or do they refer to specific makes of turbos...I'm thinking about the SCM50, what does that fall into?

 

[ChiGGz]

any help

 

[95blackGsTurbo]

14b, 16g, 18g and 20g are just names of the turbo's. To my knowledge the only difference between these can be the inlet diameter. Either 6cm or 7cm. I am pretty sure the intake side of them are all the same. The only real difference is the compressor wheel. Most turbo's are generally rated by lbs. per min. Generally speaking a 50 lbs. per minute turbo can only produce 500hp max. 60lbs. per minute = 600hp. For a good 350whp car I am still using a Big16g ported and clipped 10 degrees. I will probably upgrade to some sort of 50trim sometime but for now it's enough. But like with all turbo's you need supporting mods and tuning. I have great tuning and most every supporting mod I need and I can take untuned 60-1's all day long because they run terrible. SCM50 seems to be a good turbo though but since it's only rated at 450hp for the money I could get a EVO III or 16g of sorts. Plus you don't have to worry about the lag.

 

[ChiGGz]

Thanks for your help,

What would you compare the SCM50 turbo (50 trim) with?

 

[GVR4592]

That info about the mitsu turbo's is not accurate. I bet if you did some research you would find the difference between a 300hp turbo (14b) and a 500 hp turbo (20g) is not the turbine wheel. Just a guess. 6cm and 7 cm refers to the internal volume of the turbine housing, equivalent to garrets a/r numbers.

The lbs/min to horsepower thing is not correct either, some people might use it as a general rule, but it's not accurate.

Is CFM related to xxlbs something something?
Is an additional 1 PSI of boost significant? (i know it may be mod dependent, but lets base this on a decently modded car capable of running 350 WHP)

I'm not sure what your first question is, so I'll skip to the next one. 1 psi is probably not going to be noticeable in most cases. You will probably make more power but usually 15 hp isnt that noticeable on a 350whp car

Here's some reading material for you http://www.gnttype.org/techarea/turbo/turboflow.html

You might want to pick up maximum boost by corky bell. It's a pretty good book with lots of good info.