Ive been trying to figure out what turbo I should run for my next build, and Im honnestly struggling with it even after reading the section in Maximum Boost and using this web site http://www.turbobygarrett.com/....html I cant seem to find a GT series turbo (or any other) that fits what I am looking for. I plotted my #s that I got on a GT40 and landed in the middle of the compressor map but I know for a fact that I dont need a snail that big. Im confused also on plotting points thought the map and where the compressor is still going to operate without becoming a hairdryer... I have also tried to use the calculator on http://www.stealthmodeperforma...1.xls and still havent come out with the exact same #s that I have gotten using the Garret site posted above.

I would like something that has a decent spool on it, Im planning on boosting an F22A6 and shooting for 400-425 ft lb of trq and takinng the engine to 7k. I did the math 4 times on the Garret link posted above and I still get the same #s, but I cant seem to find a decent map that supports what I am looking for.
If anyone could explain this in more... Shoot. I just dont understand and need helping figuring out how to pick the right snail. Hes the specs I have been working with.

400-425trq
estiamted .63 BSFC
12 AFR
Reving to 7k
VE of about 97-98%
132 ci (rounded a bit)
51 lbs min of air needed
28.24 psig - 30.24psia
PR of 2.2

So theres the #s I have been running to try and pick out a map. I dont know if they are correct because I cant seem to find a decent size snail (that I know itsnt some insane size) that supports what I am after. Any help would be very appriciated.

tia

Blaze

 

Atleast I didnt ask, so what turbo should I run... I just want to figure out how to find the right one..

 

te 61 from turbo elements. ull acheive ur goal easily

 

Care to post a link to the compressor flow map so I can look at it? I dont want just bolt up some turbo that sombody recomends. I want to find one thats going to spool decently and still be able to have a decent trq. curve all the way to 7k while still hitting the #s that I want to hit.

 

Anyone?

 

If you get frustrated going over the compressor maps (easy to do), start checking out dynos from people with the hp numbers you are looking for. The dyno chart will give you a pretty good idea of how that set-up spools, as well as the peak numbers. The problem with just using the compressor maps is, as one of my physics teachers used to say "the difference between theory and application is that, in theory, there is no differnce between theory and application."

In other words, the dyno plots may not be as elegant as the compressor maps, but they are real-world and can give you a really good idea of what each turbo can do for you. And, that's what you really need to know - how much power does it make and how fast does it get there.

AFTER you narrow down your choice to a turbo or a couple of turbos, use the map to make sure the numbers you need are in its efficient range.

Good luck with your project.


Modified by Top Ramen at 11:06 AM 12/15/2006

 

I would look into the GT35R. There's a reason it's the new bandwagon. Makes lot's of power and beats all similar competition in spool time. I couldn't promise what your powerband would look like though. Probably decent, but not impressive. A T3/60-1 is not a bad idea either. That turbo probably fits right in between the GT30R and 35R. Spool time is decent, especially if you go with .63A/R. Working the head over is also something that could help spool time.

 

Thanks for your guys help, I guess Ill have to try and find some 2.0s and 2.2s and take a look at their setup. I really thought that I would be able to figure it all out on paper and then just bolt up the turbo that fit the best according to whatever worked out best turbine wise.