How 'bout this combo? Advice please..

Reply Subscribe

Thread Tools

Search this Thread

Jul 9, 2004 | 07:41 AM

#16

Push Rod

Registered User

Joined: Mar 2002

Posts: 1,062

Likes: 0

From: Drive till ya hit a Polar Bear, then go back 50 miles

Quote:

Originally posted by HOHN
Rod, my guesstimate of 450hp is based on the DD dyno graph for their DD2s and UFM. I guessed the 1.5s to be better than the DD2s. It does seem to be a bit of a reach for dd2s and a comp to give more than 420 or so....

Is the DD graph a little....optimistic?

http://www.dieseldynamics.com/popup/upm.htm

justin.

Well, I would be curious what the correction factor was on that graph (I've been told, but not verified myself, that DD uses 11%). I don't believe I've ever seen an uncorrected dyno run with 80HP injectors, Comp (or UFM) and a stock turbo hit 400 HP.

Rod

Jul 9, 2004 | 08:03 AM

#17

RustyJC

Registered User

Joined: Apr 2002

Posts: 1,749

Likes: 4

From: Cypress, TX

Quote:

Originally posted by Push Rod
While towing, the stock turbo is only good for around 330 - 350 usuable HP, depending on terrain, temperature, and weight being towed.

Yep, I'm at 1250 degF towing our 13,500 lb 5th wheel with my mods (see signature) and running 347BHP/762 lb-ft. Of course, this truck would hit 1300 degF pre-turbo stock when towing the 5ver.

Rusty

Jul 9, 2004 | 08:14 AM

#18

HOHN

Registered User

Joined: Apr 2003

Posts: 6,564

Likes: 6

From: Cummins Technical Center, IN

Yeah, my truck with the same combo as Rusty dynoed a suspicious 390hp/918lb-ft. I think they WAY overcorrected for the 6K' elevation.

I can hit 1400° on the way through 3000rpm, and then I have to shift. I feel this is about this ragged edge of the stock turbo with the 12 housing. The 16 might give me 100° drop whil killing spoolup.

justin