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T31 or T350 Wheel in SCM-61

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icedearth15

20+ Year Contributor
119
0
Dec 29, 2002
Pittsburgh, Pennsylvania
Mods are in my profile. I was wondering how much faster the PTE scm-61 will spool up with a T31 wheel opposed to a T350 wheel. And the top end differences between the two. I am not intending to get a SMIM anytime soon, so my top end is limited to around 7800 rpm or so. My goal is around 400 horsepower on 93 octane and 20-23 psi of boost. PTE sets their scm-61's up by default with their T350 wheel. I will be running 93 octane 99% of the time with a few track visits per year. I ask this because I dont think I really need the T-350 wheel for my goals, but I like the characteristics of the 60-1 compressor. Give me some ideas/opinions/or experiences.

--Dave
 
The SCM-61 is not currently offered with a T-31 turbine wheel. The T-350 wheel has worked well in many applications around the 2.0L size, so I would say go with the T-350.

The SCM-61 uses the 61mm inducer compressor wheel from the GT35R, not a 60-1 compressor wheel.

- Brian
 
icedearth15 said:
Mods are in my profile. I was wondering how much faster the PTE scm-61 will spool up with a T31 wheel opposed to a T350 wheel. And the top end differences between the two. I am not intending to get a SMIM anytime soon, so my top end is limited to around 7800 rpm or so. My goal is around 400 horsepower on 93 octane and 20-23 psi of boost. PTE sets their scm-61's up by default with their T350 wheel. I will be running 93 octane 99% of the time with a few track visits per year. I ask this because I dont think I really need the T-350 wheel for my goals, but I like the characteristics of the 60-1 compressor. Give me some ideas/opinions/or experiences.

--Dave

SCM61 isn't a 60-1 wheel, FYI.
 
NOSLO2PT0 said:
SCM61 isn't a 60-1 wheel, FYI.

Yes, if you want a 60-1, that would be the scm 5252 for the t350 wheel and a scm 6031 for the t31 wheel. You should be able to reach your goals with the 6031 without a problem. I have the 5252 and spools to 22psi around 44-4500 rpm. I beleive you can spool the 6031 around 41-4300 rpm.
 
Thanks alot guys for clearing that up for me. I thought a 61mm compressor wheel meant 60-1, how would you define a "60-1"?


92awddsm - Do you believe 200-300 rpm wait in spool between the 6031e and the 5252e would be worth it? Right now I am going towards the 5252e, only because when the time comes that I get a SMIM I can take more advantage the top end.


--Thanks,
Dave
 
I would use the T350 turbine side. The Stg3 i was told by several people isnt large enough to move the air out fast enough...
 
I am still in debate about the T31 or t350 wheel. Does anyone have any direct experience with them compared to each other?
 
icedearth15 said:
Thanks alot guys for clearing that up for me. I thought a 61mm compressor wheel meant 60-1, how would you define a "60-1"?


92awddsm - Do you believe 200-300 rpm wait in spool between the 6031e and the 5252e would be worth it? Right now I am going towards the 5252e, only because when the time comes that I get a SMIM I can take more advantage the top end.


--Thanks,
Dave

I think the larger turbine is worth the slower spool. I went with the t350 more for the fact that I will be building a 2.4 this summer and want all the exhaust flow I can get. I did have a t04b vtrim before this with the t31 wheel but cant give you any accurate comparison since the compressor flows so much more. I can tell you that my exhaust tone has more of a rumble and is louder at wot but that doesnt have anything to do with performance.

I did dyno with it and put down 320 whp at 20 psi and 363 whp at 25psi on a mustang chassis dyno with a pig rich a/f of 10.2/1. I didnt do much tuning because time became a factor and I had an line burst going to my oil pressure gauge. Im sure I could have tuned for over 400 hp at the wheels but by that time, I was pretty frustrated(had a few other issues that were dyno related) Also, keep in mind that a mustang dyno also reads about 15-18% lower than most other dynos so dont base your decision on my low dyno readings.
 
Thanks 92awddsm -- I am going with the t350 wheel, if I have to wait just 300 rpm to get a substantial amount more air flowing than I will.
 
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