66 super phat shaft anything better

[angermanagement06]

I need to get a turbo quick I was looking and found someting on here but was woundering is there something better out there than the 66super phat shaft (400 to 700 hp) because I would hate to do this twice! I want to get as much hp out of my truck some time in the future and if you can tell me who has the best prices? :--)

 

[CRiggan]

The phat shaft 66 super is the best single out there for the Cummins. Very responsive at low end and produces lots of air volume.

 

[BRayls]

The phat shaft 66 super is the best single out there for the Cummins. Very responsive at low end and produces lots of air volume.

what about the sled puller 66 from HTT? what size is the exhaust housing on the sps66? HTT has both 12 and 14 so there is choices. is that so with the sps 66?

 

[mattymac]

I think the porting between the two are what seperates them, The SPS 66 will outflow the SP66. Both are great turbos but there is a diffrence on the inside.

 

[daytripper63]

Are you planning on driving , towing or sled pulling?

My vote is for twins=Do it once do it right

no lag smooth power roll on, I dont think anyone can dispute the benefits of twins

 

[Patriot_RAM]

When I researeched before buying my SPS66, I found that the SPS66 has a larger shaft than the SP66. Phatter shaft == less chance of breaking also.

 

[jwilliams3]

It has a phatter shaft because of the larger turbine wheel.

 

[angermanagement06]

I am planning on sled pulling and racing and drive it every day but twins put me in a whole diff. class when it comes to the pulls...

so the super phat shaft 66 is the way to go then it can handle more horse power ?

who's got the best price ? :-{}

 

[jwilliams3]

Yeah the SPS is good up to around 650hp for Diesel only power maybe more.



I sled pull with mine. I am sure it would do fine draggin.

 

[Diesel Power]

yes the silver bullet will provide more air, you also have a pm Oo.

 

[woof]

whats a pm?

 

[Highfinance97]

A PM?? maybe he meant a BM :-laf no j/k PM=private message





brian maybe you should have stuck with your fords, All you broke were driveline parts with them:-laf :-laf



Michael

 

[angermanagement06]

A PM?? maybe he meant a BM :-laf no j/k PM=private message





brian maybe you should have stuck with your fords, All you broke were driveline parts with them:-laf :-laf



Michael

i hear you mikey but it might take awhile but I'll (GET ER DONE!)

 

[AK RAM]

Don’t shoot me , because I don’t own either one, but some of this info doesn’t seem right. Dare I say it sounds like……telling everyone you meet that "Banks makes more power than any other company" because that is what their flyer said. With any brand loyalties aside (for you folks that actually own one), why would this not hold true with these two turbos when it does with all the others?



The SPS66 and the Sled Puller 66 are essentially the same turbos. Both start life as a S300, both have the same size compressor housing, same compressor wheel, same turbine housing (assuming you chose 14cm for the SledPuller), both have enlarged scrolls (porting), both have enlarged wastegate volutes, and both have a wastegate cover spacer to allow the arm more travel. Keep in mind some of these may be considered "options" and may not come standard on every single turbo. The only difference between the two is the SPS has a fatter shaft and larger turbine wheel.



Those two differences between same turbos have very distinct results. The SPS will run lower drive pressure once up to speed. The Sled Puller will run at a higher shaft speed with less rotating mass. This means the Sled Puller 66 will spool faster (smaller turbine wheel is lighter & grabs more air quicker), be tougher (less rotating mass), and will flow more air (higher shaft RPMs…it is spinning the compressor wheel faster).



I don’t understand what makes the differences not have the correct effects on just these two particular turbos? If I was a newbee and just took a quick look at these two turbos, I believe the Sled Puller 66 is the one I would choose.

 

[jwilliams3]

I'll take my larger turbine wheel any day!

 

[zstroken]

The larger turbine areas have more surface area for the exhaust gas to push it around. Assuming you have enough force pushing on the exhaust turbine to keep the the compressor wheel spinning at the desired RPM you are in good shape. The problem arises when the compressors resistance to spin faster do to frictions and back pressure from compressor side exceeds the force that the exhaust side can generate, this is what give you surging. Also the larger turbines help on topend to get the gas out and still provide enough push for the compressor. Think of it as sticking a 2x4 out of your car window at 50MPH and then sticking a 4x8 sheet of plywood out at 50MPH. This all depends on how tight the exhaust housing is on the exhaust turbine too. This is something that almost needs to be explained in person so I can use my hands to help explain. Just a general theory on fluids. There are alot of items left out, such as laminar/turbulent flow, friction being a factor of velocity ^2, etc, etc.