Turbo Specs?

[4bngr]

Alright, I'm looking to turbocharge my 99si. I want to build a custom kit and need advice on a turbo. I was thinking of a garrett t3/t4 hybrid, but im not sure about a/r and trims. I want to keep it streetable, with the possibility of track time and more hp. I want the turbo to support a maximum of about 450 whp.

Advice?

[Buzz1167]

If you really want to know how everything works and how to pick a turbo, then you should read these:

http://www.mrcontrols.com/primers/sizing.htm
This one gives you alot of tools to determine what you car needs to do what, and explains alot of what happens. I found it very helpful and went through all the math a few times with 'My' specific numbers to pick my turbo. Dont bother using their numbers, your car will probably be signifigantly different, especially since your working towards 400+ hp.


http://www.stealth316.com/2-3s-compflowmaps.htm
I found that this one has alot of compressor maps about halfway though it and I used it to see closer whitch turbo I wanted, It also explains the maps with colored lines to show you a specific example, but My application was quite different, so I had to kind of overlook the lines.

I suggest that after you find a turbo that is kind of close to what your looking for (probaby one of the ones from the second webpage) that you do a google search on it and see any info you can find on it or any of its closest friends that might also work.

And from what I've read a t3/t4 might be a good choice, you just need to see which size's work better for you. Bigger compressors give you more boost ability, while larger (a/r) exausts generally slow spool time while letting more exaust through; too small an (a/r) for exaust will constrict your engine and thats not good.

Edit: Sorry for the ambiguity, when I was referring to the "size" of the exaust, "bigger" was not referring to the physical size, I meant a bigger a/r ratio.

Hope this helps

[4bngr]

yea it does, i have heard so many different hings from the 57 trim being the best to the 68, so im confuzzled as i like to put it

[Buzz1167]

If you do the calculations on the first page, then you can get all the numbers you need to make your own decision. After you have the numbers for your car, you can look at the compressor maps from the second page and figure out what will work best for you.

Hth,

[tran_nsx]

here u better hurry if u want it. oh it's a garret, not a turbonetics. http://cgi.ebay.com/ws/ebayISAPI.dll...tem=2471124025