Turbo sizing - Lateral-g Forums

surewhynot · #1 12-30-2015, 05:09 AM

I'm about to undertake my first turbo project, and have a question on sizing and style of system. First question is twin or single turbo? Second is what sizes? I was looking at a single 76 of twin 57s. Car is a 1985 olds cutlass with a 5.3, 4:10s and a t56. Car weighs about 3200 lbs. Thoughts?

surewhynot · #2 12-30-2015, 06:06 AM

Also, it's used for street, autocross and track days

**will69camaro** · #3 12-30-2015, 03:38 PM

A lot goes into this. Hard to sell what works for each setup. Gotta have power goals and budget. Single will be cheaper than twins. You also may end up changing that gear, turbos like load. Higher gear may be a nicer car to drive.

William

surewhynot · #4 12-30-2015, 04:53 PM

Quote:

Originally Posted by will69camaro

A lot goes into this. Hard to sell what works for each setup. Gotta have power goals and budget. Single will be cheaper than twins. You also may end up changing that gear, turbos like load. Higher gear may be a nicer car to drive.

William

I forgot to mention, looking for about 600-700 rwhp. I know there is a lot of variable to consider. I am just looking for any guidance I can get being that I don't even know where to begin with figuring out the turbo sizing. I have no experience sizing turbos, so any help would be appreciated.

**will69camaro** · #5 12-30-2015, 07:57 PM

For that power are you stuck to a turbo route or considering supercharger as well?

surewhynot · #6 12-31-2015, 06:37 AM

Quote:

Originally Posted by will69camaro

For that power are you stuck to a turbo route or considering supercharger as well?

Not stuck with a turbo, it just looks like that is what my budget will allow. I've got a friend with a 76mm 1.10 A/R turbo who is giving me a good deal on, I don't want a too bad of a mismatched setup. I was advised against a turbo by a local machine shop who said that super chargers are overly abusive to the bottom end, I understand thousands of people have used super chargers, but was just worth a note. Also, I know a supercharger is more compatible with a standard shift. So moral of story is I am not completely opposed to a supercharger, just opportunity has arisen for a turbo setup at this time.