Turbo upgrade for x15
08-01-2020, (Subject: Turbo upgrade for x15 ) 
Post: #1
Turbo upgrade for x15
What turbo would be best to upgrade to running between 7-800 hp and would a larger turbo bolt right up ?
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08-01-2020, (Subject: Turbo upgrade for x15 ) 
Post: #2
RE: Turbo upgrade for x15
2350's won't survive long at that power level no matter what turbo you use. The compression ratio is way to high to up the boost any over stock. I'm going to assume X15 is the same as the upped the C.R. Again.
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08-01-2020, (Subject: Turbo upgrade for x15 ) 
Post: #3
RE: Turbo upgrade for x15
A 500 series holset VG can handle that just fine. Bolting it up may need extensions + CM871 manifold though.

Like others have said though... not a good idea to crank your engine up into the redicolous engine life-shortening zones unless you got $40,000 laying around for when the inevitable happens.

You'de be far better off with a set of decent rears IF U NEED IT TO "GET UP AND GO" better, rather than torturing the most expensive component in the drive-line (the engine).

If you continue to push the subject, you will get kicked off here. I don't promote, not allow the promotion of people doing things that significantly shorten the life of and tearing up their equipment on here. Take that way of thinking back to social medai where it belongs!


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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08-01-2020, (Subject: Turbo upgrade for x15 ) 
Post: #4
RE: Turbo upgrade for x15
Thank you for the response Rawze. I don’t feel I pushed any subject, rather simply asked a question. Thank you
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 Thanks given by: Rawze
08-08-2020, (Subject: Turbo upgrade for x15 ) 
Post: #5
RE: Turbo upgrade for x15
After some consideration I’m changing out the 3:36 rears to 3:70 next week. Hopefully that will help accomplish some of my expectations.
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08-08-2020, (Subject: Turbo upgrade for x15 ) 
Post: #6
RE: Turbo upgrade for x15
(08-08-2020 )03maxpower Wrote:  After some consideration I’m changing out the 3:36 rears to 3:70 next week. Hopefully that will help accomplish some of my expectations.

I run 3:42 gears with an 18 speed. You will see a night and day difference with those 3:70 gears. I have that low end split, so I can compensate if I haul something heavy, which is rare.


User's Signature: 2008 ProStar, OEM 600hp CM-871, 18spd, 3:42, in framed in Rawze's driveway. Every day is a fresh new episode of, "The Twilight Zone"... Rod Serling lives rent free in my head. I can smell the Chesterfields.
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 Thanks given by: Nostalgic , 03maxpower
08-08-2020, (Subject: Turbo upgrade for x15 ) 
Post: #7
RE: Turbo upgrade for x15
(08-08-2020 )Waterloo Wrote:  
(08-08-2020 )03maxpower Wrote:  After some consideration I’m changing out the 3:36 rears to 3:70 next week. Hopefully that will help accomplish some of my expectations.

I run 3:42 gears with an 18 speed. You will see a night and day difference with those 3:70 gears. I have that low end split, so I can compensate if I haul something heavy, which is rare.

I also have an 18 speed but I run heavy all the time mostly on the east coast. The 3:36 just labors the motor to much in my opinion.
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 Thanks given by: Waterloo , Volvo8873 , Mattman
08-08-2020, (Subject: Turbo upgrade for x15 ) 
Post: #8
RE: Turbo upgrade for x15
I am at 3:42’s with my 13 speed and I never use use 13th. I am going to be switching to 3:90’s hopefully this fall/winter. With that being done it would be very nice then to split the top hole for driving instead of down shifting. You wont regret going with those 3:70’s even 3.90’s.


User's Signature: Born and raised in Vyskonsin on milk, cheese, bread, and beer!
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 Thanks given by: 03maxpower
08-08-2020, (Subject: Turbo upgrade for x15 ) 
Post: #9
RE: Turbo upgrade for x15
What's ball park price for changing the gears?
I to have 336 with 13 speed, I don't like them. Gets the job done, but could be better.


User's Signature: 2015 Kenworth T660
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