wow thats a lot of boost early!!!

 

This is what I found for specs on the HE351. I think the problem is the HE341 is 60mm inducer and everybody is assuming its the same hot side specs and only compressore size changes which is not true. The HE341 was a interim crossbreed HY35 where the 351 is the fully reenginered next generation at the time.

4" compressor inlet 2.75" outlet.

Standard T3 turbine inlet flange

4" Vband Exhaust outlet

Compressor Wheel:
Inducer: 60mm/2.36"
Exducer: 84.5mm/3.33"

Turbine Wheel:
Inducer: 65mm/2.56"
Exducer: 58mm/2.28"

Turbine Housing:
Single Scroll 9cm (~.65A/R)

 

I am gonna have to try TM4 and watch boost\rpm closely. I know on the TM3 and and SW5 I can spike 35 real fast. Never really watched the other relationships yet.

 

Interesting, I may have to do some more research. I have also always read the HE341 is a 54/58/9.. But you say 60?

 

where did this info come from?

 

IIRC from what was posted, its been a couple years and lots of numbers, HE341 is 58mm inducer 82mm exducer on the comp wheel, 60mm inducer 56mm exducer on the turbine wheel.

I **THINK** the discrepency is coming from comparing the comp inducer to the turbine exducer as the detemrination of sizes. Thats not correct as you need to compare comp inducer (small side) to turbine inducer (large side) to get an idea what the turbo is rated for.

Given the performance difference between the 2 turbo's there has to be a difference. Granted the numbers I have are from another source, albeit one will grant some authority to, unless we have a representative on the 2 turbos on the bench and the claipr out there will always be a question.

I do know this much, the HE351VE has these measurements which makes me think what I am on the right track for the 351 and 341:

Comp - 60mm inducer

Turbine - 70mm inducer, 60mm exducer

Housing size - 3cm^2 to 33cm^2

 

Great post

 

So how would a switzer s300 from htt compare, one that's 62/65-12?

 

A lot of the HTT and II turbos are built on the S300 frame. The SPS 62 from II is a 62mm comp, 71/65mm turbine. That seems to be the choice of a better turbo than the HE351 to negate the high DP and flow a little better to get over 500 HP.

 

so your saying the he351 is a 60/65-9?

 

60mm comp Inducer - 65mm turbine inducer, thats my understanding from what I have been told and can find for specs. It depends on how the measurements are listed and what is the primary concern.

My understanding is on the turbine side, the inducer gives the spool characteristics and low pressure flow while the exducer gives the high pressure capabilities. Then you have to add the extended tip technology that allows larger diameter wheels for better flow and top end without sacrificing spool and low pressure, both on the exducer and inducer.

Lots of numbers and math in turbo technology.

 

MY primary concern is comparing the specs stock HE 351 to what is commonly run by folks on this board...such as a 62/71-14, or a 66-71-14 so on and so on

When I shopped for my turbo..The shop I bought mine from as well as the Manufacturer (High Tech Turbo) both stated my stock HE 351 was a 60/60-9 and my HTT 62/65-12 would be a nice upgrade because of the larger exhaust turbine wheel and larger housing?

you have thrown me for a loop!

 

Just got off the phone with Cummins/Holset

HE351CW

Compressor Wheel
Inducer: 60mm
Exducer: 82mm

Turbine Wheel
Inducer: 68mm
Exducer: 60mm

Turbine Housing 9cm2

So 60/60/9 is correct.

They are going to call me back with the pressure ratio.

 

Awesome info....I dont feel as crazy now....

 

He did say that the 9cm2 flows a lot more air than one thinks for a 9cm2.. Equivalent to a little bit older 12cm2.