Best 2.5" turbo?
- Thread starter 2005LLY
- Start date
We've been as high as 740rwhp on a cast 68 cheetah. Having said that, the new 63mm billet cheetah rolls 735.
Give us a call, email or hit me up on fb and we can discuss it more.
Hey Mark,
http://www.duramaxdiesels.com/forum/showpost.php?p=667256&postcount=6
Brayden doesn't clip wheels?
This one doesn't have the smooth edge like in the model he showed.
I guess I am still confused over all this
A bead blasted billet wheel to make it look casted is against the rules. But plenty of shops offer that! That's no grey area! Everyone's gonna be accused of cheating, just gotta do your own research and not believe only what you find out on the Internet!
Hey Mark,
http://www.duramaxdiesels.com/forum/showpost.php?p=667256&postcount=6
Brayden doesn't clip wheels?
This one doesn't have the smooth edge like in the model he showed.
I guess I am still confused over all this
That's a 2.6 Charger..... not a 2.5
Hey Mark,
http://www.duramaxdiesels.com/forum/showpost.php?p=667256&postcount=6
Brayden doesn't clip wheels?
This one doesn't have the smooth edge like in the model he showed.
I guess I am still confused over all this
Well what you have there is a old 2.6" Clipped Protrusion turbo. Common in most National 2.6" organizations. That one actually built by ED. This is a thread concerning 2.5" turbo rules, that clearly states NO CLIPPED WHEELS.
The Definition of "Clipping" a wheel is taking a wheel out of a box from a manufacturer and either putting it on a lathe and cutting, or grinding the inducer down to a smaller demension. This method is used to either make a perpendicular step like you have there in order to meet 2.6" or 3.0" Protrusion rules. Or "Clipping" could be used to make a drastic change to the profile of a wheel in order to make a big wheel fit into little wheel rules.
Now nowhere is there a stated Exducer limit, mainly because it would be hard to tech. So changing the profile of a wheel that meets the set inducer limit, and adding a larger exducer is not illegal. Its taking advantage of what you have.
For all reading to understand, the Exploited Grey area in this conversation is defining whether or not the wheel has been "Clipped" or is just made that way. Its a matter of interpretation which is why it has been so heated, and hard to discern. In order for it to be legal in 2.5" it obviously cannot be a perpendicular step like 2.6". But does that mean adding a drastic or exaggerated downward "taper" is legal, as long as it has 1/8" protrusion of a 63mm inducer? This is the question (not an accusation), and where those that be need to come together and address the rules so it can be better defined and clarified.
FPE's Comp 2.5" Compressor is derived from a Holset based profile, which is a pyramid type wheel, that naturally never protrudes square into the bore, unlike a Borg which does. This is the case from Holset HX35's to HX60's and beyond. FPE took extra steps in order to make it legal for the 1/8" Protrusion rule for BOB & ITPA, in which case it actually has almost 3/8" of protrusion square into the bore. The wheel comes out of a box from the MFG and onto turbos. No other modifications are made. Its used because it is FPE's proprietary design developed over the past two years, first with the Holset HE351 Cheetah, and now used in the entire line of Billet Cheetah Turbos. It has helped us further advance the capabilities of the entire line, and can only be bought from Fleece Performance.
Caleb
If a wheel is blueprinted and manufactured the a super back verus being modified, what is the difference of the end result? Danville wasn't the first to cut one, probably the last. E.D. And another company have both done it. Or had serious plans of it before. Ill be in the market for a new charger because I am playing catch up with trucks already equipped with them.
Also can somebody please explain to me what a step down cover is? Is that to fit that compressor in the link posted?
No, not a single truck had the charger teched at the two bob hooks I've been to this year. There are 2.6 truck(s) that have not been teched once this entire year other than hitch height and weight.
A stepped down cover is a result when you clip a wheel. If you were to take a cover off a turbo, and run your finger from the inducer bore to the exducer without lifting it, it should be a nice smooth transition from start to finish. With a stepped cover you would feel two distinct bumps as your finger fell into the "step" and came back out.
Typically the step is done in conjunction with the MWE groove, so that the "Clipped" section of the wheel can pull air thru the MWE groove.
All that said, when we modify OE style turbos, and machine the covers for the larger wheels, the MWE groove changes due to the casting and the material being removed in a way that could also resemble a step. So common sense has to be used if you were looking for one.
Caleb
Okay so that's just the correct term to use for the cover on a clipped wheel? I always got confused before they say both no clipped wheel or stepped cover. I originally thought a step cover was a bushing welded in with no wheel protruding into the bushed bore. I was wrong.
Btw an Ohio truck running the street class lastnight got teched after putting it in the sand.
Btw an Ohio truck running the street class lastnight got teched after putting it in the sand.
