From smallest to largest....

16g
20g
3071
3076
50 trim
57 trim
3037
35r.

Is this the correct order and am i missing any of the more popular turbos??? Ime still trying to figure which is the most effecient and quickest spooling for 450 HP with 100 octane.........Ray

 

Here is the order based on compressor inducer size:

16g
20g 52.6mm
3071 53.1mm
50trim 53.9mm
57trim 56.6mm
3076/3037 57mm
3582 61.4mm

The GT3071 will be the fastest spooling and still make ~430whp on 100oct. The 50trim has roughly the same size inducer, but has a bigger 76mm wheel and a bigger turbine wheel then the GT30R. Which means it will spool very similar to a GT3076 (assuming a 50trim BB). For an easy 450whp then a GT3076 w/ a 52lb wheel will be the best. If losing 20hp is worth a decrease of 300-400rpm of spool up then a GT3071 is what you want.

 

Fastest by spool up.

16g
3071
GT3076 w/52lb wheel
20g
50trim
57trim
3582

The 50 trim BB, 20g, GT3076 w/ 52 wheel all spool roughly the same. I am assuming you are comparing a MHI 20G in both.

 

Ray,


This website has a lot of info on size and flow:


http://store.yahoo.com/cheapturbo/garrettgt35r.html

Carlos

 

better to use pound per minute for turbo sizing

small 16g 34lb/min
evo 16g 40lb/min
20g 43lb/min
3071 ?
57 trim 47lb/min
50 trim 49lb/min
3076 52 lb/min
35r 65lb/min

 

A 3071 is rated at 47lbs. The 57 trim has to be around 51lbs since the inducer is so close in size as the 3076.

 

o.k. well i guess ime going to get the 57 trim. I hope thats the most effecient for 450HP. I could get a GT but i still need injectors and the few bucks i have left i need to get the turbo and injectors. Oh well, ill add a different turbo later if need be....or should i get the 50 trim.....I thought getting a turbo kit would be fun. PIA.......Ray

 

here are the turbos I consider relevant

2005 Ev0 16g

evo IX stock

IX 20G by Buschur

Gt35R

Gt42R

Given the way the GT35 and IX turbos work - I would not personally consider any Gt30 based unit of a 50 trim

 

What about a 60-1 to4s-61lb min.

 

i thought about the 60-1, but then you are getting close to the 35r flow rate. I tghink its 65 or somthing. Ime getting the 57 trim or the 3037. Al, i had a 35r. I hit 28psi at 6000rpm. Once i did, i couldnt keep it off the limiter. Just want a simple 450HP. 35r is overkill.....maybe when i get the stroker......

 

As per my recollection, the 57 trim has a very narrow compressor efficiency window, and the 50 trim would be a better, more versatile choice. Also, I seem to recall that 57 trim to be less forgiving to surging issues. The 50 trim seems to do everything the 57 can do and usually better.


Not a good choice for an EVO. That 60-1 is intended to run low boost pressure on a higher compression V8. It's peak efficiency range is around 12psi, which makes it a poor choice for our application.


This is why there is more to turbo selection than looking at 'lb/min' flow capacity. I strongly suggest having a look at the compressor maps.

 

Ray, the 57 trim is a good choice for your goals. I have had both 57trim and 50 trim on my car and can tell you with data to back it up . I made 398hp/400tq at 21 psi with a 57 trim. I also tested a gt30 turbo that was promised to squish the performance of the 57 trim. It did not. It spooled 200rpm slower and had to be cranked to 24psi to equal the power of the 57. I also moniter turbo out temps and throttle body temps and the 57 trim won there too. I tried the 50 trim breifly on my car as a step back from a 25g. I tried this because there is so much internet hopla about how well the 50 trim performs. The performance was very much a disappointment from the 25g and close to the same as the 57trim. A few points of efficiency on a compressor map dont mean dick after it goes through the intercooler.

There is a huge peformance gap between the 20g and 35r turbos. The turbonetics 50,54,57,and 60 trim fill this gap very nicely. Stay away from 60-1 or any gt30 turbo with a 7blade compressor wheel. they are spool dogs.

 

thanks guys for the input. Ill keep you posted as to what i get. I think the 57 trim is oil cooled only.....thats o.k. right????

 

At only 400whp and 21 psi with either unit, efficiency isn't an issue . . . yet.

Furthermore, the IC don't mean 'dick' when it comes to the 57's surge line, and after driving a 57 trim car with big surging issues (he eventually swapped in a 50), it suddenly makes sense as to all the 'internet hoopla' about the 50 trim. Better power potential, better efficiency, and less potential for surging issues - reasons that illustrate why it's a far more popular unit.

But hey, no reason to get ruffled with me about it. I didn't make it that way.

http://www.pagparts.com/Garrett_Turb...&type=t450trim

 

I am familiar to Mitusbishi turbos sizes since I had upgraded multiple of my cars in the past to upgraded mitsubishi turbos

I think your information about the 16G and the 20G is a bit off, as I mention before the Big 16g flows about 550CFM and a 20G flows 650CFM @15PSI, this means that the difference in flow is 15.6%.

The reference that you use about 40lbm and 43 lbm would give you a 6.98% increase. I know Mitsubishi turbos fairly well, I have had my car turbos in the past upgraded to:

91 GSx with a Evo III turbo
90 Laser to a Big 16G
91 Stealth TT from 9bs to 13G turbos
03 WRX to 18G reverse thrust impelers

These are a few links to address my point:

http://www.turboclub.com/makes/mit/S...CNMTURBOS.html

http://forums.nasioc.com/forums/arch.../t-278517.html

http://forums.clubrsx.com/archive/in.../t-256688.html

my .2c