Need turbo advice: Detroit 12.7 s60

I think the 702 will work good with the 373s. The noticeable difference is at higher RPMs.1500+. You’ll notice a difference. Original injectors are just fine. Not going racing, Lol. The manifold is expensive. Not really needed, unless pushing high HP. I guess I’ll end up getting my ECM “tuned”. Mainly for fuel economy. That’s most important. This Trucks never gotten good economy since new. Got to do something about that.

 

Some set injector calibrations at 75 on all 6. It gives better response at lower RPMs, but can cause a rough idle. I had mine set different. Took the highest calibration number, set it at 75. Then added the difference to the other 5. Seems good. Still Idles smooth. Also put flow through mufflers on. Supposed add a little hp. letting it breath better. Next is drilling out the return fuel restriction fitting on back of head. I think it’s .88mm stock. Drilling to 100-105mm, Max supposedly allows fuel to return quicker, thus lowering fuel temp in head, for better atomized fuel. What the heck, I’ll try it. Cheap and easy to do. The other cheap trick is putting a 10 ohm? resister on the turbo boost sensor. Tricks the turbo somehow. I’m not sure exactly. But I think it makes the turbo perform better at higher RPMs, and a bit less at lower RPMs. A bit of a trade off. I hear it’s even better to tap sensor into the intake, closer to the cac instead of installing a resistor. Don’t really know myself. Just ideas for you to research. All old cheap tricks for 12.7s

 

Same here, one thing at a time also. That way, if there’s a problem, you know what it is. Change 5 things at once, and if there’s a problem. Where do you start?

 

171702 will be a little laggy on a 470 id go will the 701 thats not waste gated

 

I think the 701 is waste gated, 702 isn’t. Otherwise their the same.

 

Wrong.

171702 is a 75mm compressor
171701 is a 71mm compressor

Everything else is the same. No wastegate.

 

Ah ha!! That explains a lot. Thanks. I wonder what the 2 BWs I bought in the past were. They were wastegated, supposed to cross over time original garret, on my 12.7 Both times bought off the shelf at Truckpro.