171702 with 1.15 ar

Has anyone tried s475 with 1.15ar ? How was the spool and egt? I am building another truck that will only run mountains. Looking for quicker spool and better Jake's down the mountain while still be able to make 600hp.

 

Your not gona make 600 hp with turbo if by some miracle you can there will be no longevity of that turbo

 

How high of an altitude are you running in? If you are up high 3500ft or above 24/7 I would say go for it to see if you like it. EGT's are going to be an issue when warm or at lower altitude. You will find that because of the restriction more RPM on a climb will not equate to lower EGT because of back pressure at lower altitudes. Yes on faster spool. For most use cases the 1.32 is really the go to.

 

Will be hanging around CO running over Loveland,vail,wolf creek,monarch etc anywhere from 5k ft to 12k altitude. If Jake's and spool are greatly improved I don't mind lowering power to keep egt in check.

 

Lol maybe I don't think making hp would be a problem as much as egt and possibly overspending to much pressure on the shaft risk of breaking it?I don't mind lowering power if it means better Jake's and better spool. Not sure another option I was thinking was adding a 5 inch exhaust brake in hope of building more back pressure raising boost during Jake? anyone tried this?

 

When you did your motor work, did you put a rebuild kit in the engine brakes? Jake maintenance tends to get forgotten about. Springs get weak, solenoids, accumulators, seals all wear.

A non variable vane geometry turbo older truck will never build boost and hold back like a VGT turbo truck.

As for overspeed. If it is an actual borg warner turbo, and you do not drive like a crazy person, again at your altitude I do not think you will have a problem. If you have the fuel to push that thing up past 50psi .... maybe. If you let off abruptly on every shift and stall the compressor to make the cool noise, definitely. But if you roll on and off the throttle driving a non stock truck responsibly ... it "should" last.

 

Yes Jakes have been rebuilt and new solenoids unfortunately going to bigger exducer losses that back pressure that 1.15 could build. Where 1.15 used to build 20+ psi 1.32 does 8-10 psi.

No need for 50 psi since I'm not driving it I would keep it 35 and under. Spool and Jake's are pretty important reason I was thinking going s475 with smaller exducer was in hope of making decent power while keeping that quicker spool and Jake.

If 1.15 doesn't work I was thinking of adding exhaust brake to see if I can add more boost while Jake is on to provide more stopping power? Trying 1.15 was a cheaper option since I can get the housing for 250$ vs 1200$ for a complete 5 inch exhaust brake.

 

What your worried about over speeding that turbo would be my biggest concern like it was mentioned the EGTs are also something I would have my concerns with I am not a fan of that turbo and would even be less of a fan of it in mountain driving
I’ve never ran a exhaust brake myself but have heard they work well

 

EGTs will be higher the higher you go in elevation. Less oxygen/fuel equals higher temps.

 

I guess I missed it…what engine is this going on?