how do you decide the correct size turbo for the amount of PSI i want to run?

[FaNtUm2113]

i have done some searching and havent been able to find any where that shows this so i figured i might as well just try asking.

how do you decide the correct size turbo for the amount of PSI i want to run? lets say i want to run 25 PSI is there certain turbos better for handling this? obviously i know certain ones are limited to lower boost levels but which ones would be able to put this much out?

Also, how do you choose injector size? is that based on how much PSI is going to be run? or is that a HP related question?

these maybe dumb questions but sometimes i read these forums and people throw out #'s nd letters of parts nd it looks like chicken scratch to me haha.

thanks for the help

 

[DGajre777]

i have done some searching and havent been able to find any where that shows this so i figured i might as well just try asking.

how do you decide the correct size turbo for the amount of PSI i want to run? lets say i want to run 25 PSI is there certain turbos better for handling this? obviously i know certain ones are limited to lower boost levels but which ones would be able to put this much out?

Also, how do you choose injector size? is that based on how much PSI is going to be run? or is that a HP related question?

these maybe dumb questions but sometimes i read these forums and people throw out #'s nd letters of parts nd it looks like chicken scratch to me haha.

thanks for the help

PSI is just a number. 25 PSI on a T28 will not put out the same power as 25PSI on a GT35. You need to determine your power goals (whp and torque) and then start looking at turbos. A T25 (the stock 2G) turbo will run out of steam after about 17psi of boost. You can run 25psi on the T28 or the EVO III 16G or a 50 trim turbo.

You choose your injectors size (and fuel pump) based on your power goal too. For an Evo III 16G, you could get away with a Walbro 190 pump and 650cc injectors. For a 50 trim you could get a 255 with an AFPR and 750cc injectors. Injector selection depends on what you use to tune your engine. If you plan to use an SAFC, you should get 650cc injectors unless you get a chip from DSMchips.com . If you plan to get DSMLink, buy the biggest injectors you can afford that make sense for your turbo. If you never plan to go bigger than a 50 trim, then don't get 1600cc injectors.

Time to go reading for hours...

http://www.dsmtuners.com/forums/fre...uestions/55410-top-10-most-popular-dsm-q.html

Frequently Answered DSM Questions - DSM Forums

VFAQ Site - Visual Frequently Answered Questions

 

[SD99GST]

This is a small chart found on RRE's website. Good way to get started on understanding the upgrade path you ask for. Hope it helps.

 

[FaNtUm2113]

thanks for the help guys!

i have set my goals around 450-500 HP. i plan on getting the SAFC such as the AEM-EMS. the build is going slow right now but the mods so far include block machined to .2 over and i got eagle rods(which have been balanced) and ross racing pistons with 8.3:1 compression also .2 over. and the crank is balanced.

i am FWD so i guess i have to try to keep some lag to maintain traction right?

so to get that kind of HP i figured i would need roughly 25-30 PSI correct. i was leaning toward 720cc injectors. is the walbro 255 big enough to handle that? and what size fuel lines does that need?

and that would require bigger then a 50 trim correct?

 

[knochgoon24]

Hope you mean .02 over.

 

[DGajre777]

thanks for the help guys!

i have set my goals around 450-500 HP. i plan on getting the SAFC such as the AEM-EMS. the build is going slow right now but the mods so far include block machined to .2 over and i got eagle rods(which have been balanced) and ross racing pistons with 8.3:1 compression also .2 over. and the crank is balanced.

i am FWD so i guess i have to try to keep some lag to maintain traction right?

so to get that kind of HP i figured i would need roughly 25-30 PSI correct. i was leaning toward 720cc injectors. is the walbro 255 big enough to handle that? and what size fuel lines does that need?

and that would require bigger then a 50 trim correct?

There is standard bore, 0.020 and 0.040. I think you missed a 0 in your .2 up there.

450-500 crank hp or whp? If crank, then yes a 50 trim with 750ccs (or 850ccs) on 25-30psi is doable (even on the stock block engine).

The AEM EMS is not a SAFC. SAFC is made by Apexi.

 

[kahl23]

There is also a huge difference between a SAFC and EMS. EMS is a new ECU which allows you to control nearly every aspect of your tune; and SAFC is simply a fuel controller that piggybacks over the stock ECU.

 

[FaNtUm2113]

yea deffinatly forgot the 0 when typing the number sorry about that! trying to type to fast.

ok so im have a fair knowledge of cars unfortunatly never learned the performance aspect so im kinda learning as i go.

so would just an SAFC be enough to get me to that HP range or would an EMS be better off?

and also how much of a diffrence is there from what a car puts out for CRANK HP to what it puts out for WHP is there a huge drop off?

 

[spydermanX98X]

If you can't distinguish between the SAFC and EMS. Super Air Flow Controller, and Engine Management System. you have problem problem problems getting to 500 horsepower. It's a tought number to reach and I think you'd be best getting DSMlink. which is a whole different story, ultimately you need to read alot, so some good bonding time with the search button will do you alot of good.

 

[->PrOjEcTGS<-]

I know this is said a lot around here but, you are pretty new and the search button will help you understand most of all the questions you are asking here.

 

[SD99GST]

I dont mean to burst your bubble either, but after reading myself for some time I discovered that 450-500 hp is very hard to do and takes a lot of money and knowledge to achieve. Not saying you cant do it, but will take time and hard work I think. And remember, making it somewhat reliable so that it does not break down right away is what I mean by it will take time. Good luck with that, keep us updated...