Turbo Class ? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 10-11-2009, 05:38 AM Thread Starter
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Turbo Class ?

My numbers may be off...

But, under 66mil is 2.5 class right?

66-70 is 2.6?

Anything over 71 is 2.8?

Ish?

Is there anything a guy can run, that will fit with the max potential of some 250cc with 200%'s without throwin him into the 2.8 class? What's my best bet for a 2.5-2.6 turbo?

Sorry if this is a duplicate thread, but I suck at search... I found tons of stuff about PW lol.

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post #2 of 12 (permalink) Old 10-11-2009, 09:02 AM
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Re: Turbo Class ?

a s470 or a gt4294 would fit the bill pretty nicely.

'96 f-250, auto, shackle flip, solid axle, rsk, high/crossover steering, 3.73's, true trac's front and rear, trac bars, gt4202, 7.3 ic, idm mod, ccv mod, A1000, 4-line DIY Gen3, dual ipr's, casserly 350/200's, arp studs, 910's, pushrods, elec. fan, 2-stage nitrous, fluidampr.


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post #3 of 12 (permalink) Old 10-11-2009, 12:18 PM
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Re: Turbo Class ?

2.6 class cant be over 66. so either 66mm h2e or s465.

1996 F-250 ex-cab -D60- Motor,fire hoses-Nate,Tuning,Cam-Matt R,P-rods,dummy plugs-Wipe Out,Huffer-Engineered diesel,Carson,Gen3,Idm-Swamps,Rods,studs,fire rings-WOP,Clutch-Valair
455/400's in,S475 T-6 mounted
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post #4 of 12 (permalink) Old 10-11-2009, 03:46 PM
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Re: Turbo Class ?

Depends on the rules and how they read. Generally for the 2.6 class the inducer bore needs to measure 2.600", checked by using a 2.650" plug. If the plug doesn't go in its legal. Now 2.6" equates to 66.04mm BUT many off the shelf 66mm turbos will FAIL the plug test. You need to make sure that where ever you buy your turbo from that it will tech legal for your class.

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post #5 of 12 (permalink) Old 10-12-2009, 06:31 PM Thread Starter
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Re: Turbo Class ?

Can housings be played with to get a 66mil under 2.6 tech?

What would you recommend HRT? The only 2.6 classes I'll be lookin to pull are gonna be in KY. Most of the pulls in TN here are "stock" "street" "unlimited" etc...

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post #6 of 12 (permalink) Old 10-12-2009, 06:50 PM
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Re: Turbo Class ?

Quote:
Originally Posted by chvyrkr81 View Post
Can housings be played with to get a 66mil under 2.6 tech?

What would you recommend HRT? The only 2.6 classes I'll be lookin to pull are gonna be in KY. Most of the pulls in TN here are "stock" "street" "unlimited" etc...
Most of the time you need to tell them that the turbo will be teched using a 2.650" plug - some rules say they will be teched using a 2.600" plug - so be careful.

I would want to know the EXACT rules you intend to pull with before I make a concrete recommendation - but it would be S400 based if the preference was left up to me.

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post #7 of 12 (permalink) Old 10-12-2009, 06:55 PM Thread Starter
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Re: Turbo Class ?

I'll see if I can find something then.

Thanks!

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post #8 of 12 (permalink) Old 10-12-2009, 07:07 PM Thread Starter
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Re: Turbo Class ?

The only thing I found was for the KOTTPA 2.5 class. Generally, they're the ones putting on the 2.6 classes though. Their rules for 2.5 are 2.55 plug with no reducers so...

Recon I got more homework to do...

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post #9 of 12 (permalink) Old 10-12-2009, 08:02 PM Thread Starter
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Re: Turbo Class ?

Ok, found this for one of the other pullin associations up there. So, looks like I'd be good with an actual 2.6.

Turbocharger: The vehicle is limited to a single turbocharger; the inducer bore on the
compressor housing may be no larger than 2.6 inches measured at the smallest diameter area
of the compressor wheel. The inlet will be measured using a 2.65-inch plug or internal calipers.
A stock map width enhancement (MWE) groove is allowed. No MWE groove will be allowed that
has a width greater than 1/4 inch. All provisions allowing air to the wheel other than via the bore
and the MWE groove are prohibited. Bore must be uniform in size throughout the diameter. 6.4
liter Powerstroke engines may utilize the factory twin-turbo configuration. Bushings are allowed

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post #10 of 12 (permalink) Old 10-13-2009, 01:18 PM
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Re: Turbo Class ?

Quote:
Originally Posted by chvyrkr81 View Post
Ok, found this for one of the other pullin associations up there. So, looks like I'd be good with an actual 2.6.

Turbocharger: The vehicle is limited to a single turbocharger; the inducer bore on the
compressor housing may be no larger than 2.6 inches measured at the smallest diameter area
of the compressor wheel. The inlet will be measured using a 2.65-inch plug or internal calipers.
A stock map width enhancement (MWE) groove is allowed. No MWE groove will be allowed that
has a width greater than 1/4 inch. All provisions allowing air to the wheel other than via the bore
and the MWE groove are prohibited. Bore must be uniform in size throughout the diameter. 6.4
liter Powerstroke engines may utilize the factory twin-turbo configuration. Bushings are allowed
The part in bold opens up a whole new can of worms... Depending on how much you pull and where you pull, You could get an S475 and use a bushing to make it 2.600.
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