Turbo Questions

[EWingertsahn]

On my truck i have an HE351 turbo. i believe its a 60/60/9 no i am not quite sure what this means. can some one please explain?



Also with a turbo if say you increase you wheel from a 54 mm to a 60 mm does this mean you will increase you turbo lag or just air pressure?



What is the difference between a 6 blade compressor wheel and an 8 blade compressor wheel?



Is the HE351 a ball bering turbo or does it contain bushings?

 

[timelessconstructionllc]

I have no answers for you but I can already tell you've done more research than me with regard to turbos. Good questions, I'm anxious to learn thw answers myself.

 

[EWingertsahn]

Ok I found the answer for the 54 mm to 60 mm turbo question. Yes you do create a little more lag but it probably will not be noticeable. Also it will pull more air into you turbo. I am still doing more research on the 6 blade vs. 8 blade.

 

[rscurtis]

Your 351 uses a bushing, not ball bearings. BD makes the perfect turbo for your truck, their "Killer B". It is supposed to be a direct replacement, and not require the adapter on my Super B. I would ditch the K&N if I were you.

 

[AH64ID]

HE351 is a journal bearing turbo.

60/60/9 represent the smaller side of the compressor/turbine and the housing size. The small side is just one number, you can have a 60x80 comp wheel and a 60x85 comp wheel, they are both called 60's but the 60x85 will flow more.

Generally speaking a larger wheel is slower to spool and flows more air.

6 vs 7 vs 8 is just how much bite the comp wheel has, it's like 6cyl vs 8cyl. 6 big jugs or 8 smaller ones?

I talk a little about the Garrett Stage 2 vs the HE351 in my turbo thread, https://www.turbodieselregister.com...-powermax-stage-2-gt3782r-install-review.html

Here is a stock HE351 wheel. 7 blades, but you can see the secondary blades don't come all the way up like the 6 blades on the Garrett.

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[EWingertsahn]

Ok thank you for all of the information. I am still learning about turbos and what makes one better than the other.



So your saying that 6,7,or 8 blades change the "bite". your saying wether 6 or 8 it wont change any volume or spool quicker or even slower?





@rscurtis--Why would you suggest i get rid of the K&N filter?

 

[AH64ID]

No the number of blades can improve the flow for the same size compressor. . but its really hard to compare. CFM or lb/min is what should be used to compare.

The HE351 comp wheel and the comp wheel in my Garrett are very close in size but the Garrett outflows the HE351 and spools faster due to the ball bearing center.

 

[EWingertsahn]

ok but comparing the cost of the two?



Wouldn't the cost of a stock turbo upgrade be cheaper than a new turbo?

 

[rscurtis]

The K&N is not an absolute filter. Look at it carefully, you can actually see through it. It may or may not flow a little better than the stocker, but with the new deep element, the stock filter is good for 500HP, is an absolute filter, and requires no maintenance.



If the K&N was that great of a filter, it would be used by many OEM's.

 

[AH64ID]

ok but comparing the cost of the two?



Wouldn't the cost of a stock turbo upgrade be cheaper than a new turbo?

Correct, but your 75% of the way to a much better turbo with a stock upgrade.



Regarding the K&N they filter poorly, and let oily dust thru which in turn destroys your turbo.



They are a marginal filter on a naturally aspirated rig that never leaves the fwy, otherwise they are all hype.

 

[EWingertsahn]

What type of filter would you suggest?

 

[AH64ID]

Stock 4" pleated filter, nothing beats it in filtration vs flow. It's the only OEM filter on my truck, if that says anything.