Opinions on a Detroit series 60 turbo

K31 IMO

 

I got k31 on one truck and 702 on another. Both trucks are identical except turbos.
702 is a waste below 550hp, the turbo lag is very annoying, especially with 10 speed.

K31 is a good all around turbo, be it 470hp or 550. If your customer is staying stock, that's a better choice for him, good power and mpg.

 

I tried maybe 5 different turbos on my older engine over 2 months. The K31 was an easily noticeable improvement over the three non wastegated ones I tried.

Factory on that engine was the S400, and it was gutless. The K31 stayed.

I'm headed home for a minute. If I get to swing by the shop I'll let you know the #'s.

FYI, all 4 engines responded best with the K31

92 DDEC II 11.1
97 DDEC III 11.1
97 DDEC III 12.7 500
98 DDEC IV 12.7 500

 

The K31 is definitely the best option for a stock 470

 

Hands down the K31 will come out on top for 470 the 701 aint bad at all but it will just lag abit more the K31 is good up to 550-575hp where it kinda runs outa steam then

 

i didn't like the k31 was limited to 30psi boost so i did the right thing and tightened. the waste gate up 5 turns right at 40 psi now.

 

Untill it says see yah thats too much lol they seem to like to stay 35 or under for the most part from what ive seen
How long have you had yours at 40 PSI

 

couple weeks was a turd stock motor is set at 550