What turbos have the 2.5 Inducer for pulling? I want to run this class but Im havin' a hard time findong this info on Turbos. I guess I really need to know what the best 2.5 Turbo is and what everyone else is running?

Thanks,
Josh

 

I would say the best 2.5 turbo would be Industrial Injection's silver 64. If ITPA or DHRA come out with that class instead of a 2.6 that is the one I am going to use.

 

I finally found an old post with some of this info but the turbos are most likely outdated. Anyway heres the brekdown from what I can tell...

62=2.44in
64=2.52in

So I guess we can run anything with a 64mm or smaller inducer!

 

An out of the box 64mm turbo will not meet the 2.5 rule most of the time becuase the 64 of a turbo is the inducer wheel size not the size of the actual compressor inducer which is what is measured at the pulls.

 

Figure 25.4 mm per inch would be 63.5 mm.

 

What Turbos meet these specs? You guys should know, you're running them! Im new to pulling and trying to find a set-up to start with and work from there!

 

S465 with a .9 a/r T-4 exhaust housing

 

JIT you may want to build a truck and keep a stock turbo for a while until you start winning the stock turbo class. There is a lot to do in set up and driving that should come first. Pull next year in the stock class, then step up to the next class. Just my opinon though.

 

I think you're right Mike... it seems there is a lot to learn!

Josh


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a 62-14 would be a good charger to run. Most 64mm chargers have a larger inducer on the housing and will get you thrown out.

PM me if ya have any more questions. ive got a lil experience with the 2.5 class.

Wes

 

thats rite!
Brandon

 

dumb question but I haven't been into pulling. What's the reason for having these classes ? I know you can go from stock to pro but, are they expecting you to only have so much power by the size turbo you're running ? In other words, by having a 2.5mm does tell who ever is checking your hp will be between X and X ?

 

The classes help even the field out, so the guy with a stock turbo isn't competing with the guy with a SPS66.

 

Thanks... I figured that. It seems to me though that if you say, run in the 2.5 class.... there could be a big variance in the hp all the trucks in that class have.

I just didn't understand how fields are evened out just on the size of the compressor. Lots of other things could be helping to create the hp.

 

they use the turbo like a restritor plate it dosent matter what other modifications you have it will only flow x ammount of air. to burn x ammount of fuel any more than that is a waste. but you can still change cams, port heads, etc to get an advantage.