CRP stage 4 build (lower than expected power levels)

[Muchmore]

First thought is something is missing. Something doesn't seem right but you guys are right there and would know best. With the factory strategy I have heard these motors are tuned to hit the 500tq number and just remain there over the entire rpm range. We've always heard that there is torque left on the table for the sake of having a flat torque curve.

This is a very, very general question but is whatever limits that factory tq number affecting your install? Maybe that is all done in the tuning and you have already eliminated that aspect.

 

[Guy]

Answered this via PM.

short answer... it isn’t a limiter issue at this time. It’s a knock issue and can’t push the timing further.

First thought is something is missing. Something doesn't seem right but you guys are right there and would know best. With the factory strategy I have heard these motors are tuned to hit the 500tq number and just remain there over the entire rpm range. We've always heard that there is torque left on the table for the sake of having a flat torque curve.

This is a very, very general question but is whatever limits that factory tq number affecting your install? Maybe that is all done in the tuning and you have already eliminated that aspect.

 

[xrocket21]

**** injection systems are pretty cheap. I had good luck with a coolingmist progressive setup on my STI, and I ran 80/20 VP methanol/Distilled water.

Its an on demand system so daily driving you dont use any, but when you tromp on it, the system kicks in.

 

[Raptor 2014]

no.

1:1 is a 7th gear pull. Going to 4th or 3rd skews it even further.

7th gear is hard with the speed limiter and pulls tend to be done in 5th.

A 7th gear pull will yield a small amount more in the way of torque. Instead of 488... maybe around 500... I’d expect 570 on a 5th gear pull with close to 600 in 7th. Not even close.

it has nothing to do with unrealistic expectations. I was promised something by the company that makes the turbos and it’s totally false, much like the dyno graphs floated out there.

people can decide for themselves. If folks think 12-14 grand is worth it for 50 horsepower with no real increase in low end torque... it’s their money and they can spend it. I don’t think it is. It’s done now. When I swap it out for the next great thing maybe the next guy will
appreciate it.

I didn’t list the shop or the tuner for a reason. They’re awesome and they tried their best. Quite frankly I don’t think they will want anything to do with this build ever again on another truck because it’s a ton of time and money for small gains. They probably don’t want to be associated with that sort of thing and I don’t blame them. They’re an amazing shop and I was privileged to have them do the work. They aren’t going to tune it any hotter than it is, and I can respect that because they made what they feel is a safe daily driver. I am going to try Some different tunes by someone who has experience specifically with these turbos to see what more I can squeeze out. Whatever it is.... it’ll never be close to what was promised...

Pump gas is the limiting factor. Many, many people post / advertise unrealistic RWHP numbers. They they show a graph. The only problem is that no other variables are shown. Dyno numbers are very easily manipulatd. Overall Gear ratio is the most common variable between RWHP numbers. Our tires are the limiting factor for a true 1 to 1 trans ratio measurement. Differential ratio plays a factor also 4:11 or 5+ whatever. You can not perform a proper pull because of your tire's limiting factor. Not safe because of the loading on the dyno and rotational speed. Your numbers are about right for your engine combo, overall gear ratio and drivertrain loss. A turbo is only as eficient as to how much it heats the air charge for your application.

 

[Muchmore]

Answered this via PM.
short answer... it isn’t a limiter issue at this time. It’s a knock issue and can’t push the timing further.

Got it and of course read your response. Just hard t believe I mean not making as much as advertised is one thing but this is a big discrepancy. Sorry man keep trying.

 

[dillard09]

Well Guy and I have been talking alot. We both have the same setup except I have a forged RMB stage 2 motor, ported heads, and XDI HPFP. I need another 800 miles to make 1000 miles before I go to get my dyno tune. I will report back what I come up with. Not expecting much more that what Guy got to be honest but who nows.

 

[Guy]

Just was hoping for more.


QUOTE="Raptor 2014, post: 1580466, member: 12350"]Pump gas is the limiting factor. Many, many people post / advertise unrealistic RWHP numbers. They they show a graph. The only problem is that no other variables are shown. Dyno numbers are very easily manipulatd. Overall Gear ratio is the most common variable between RWHP numbers. Our tires are the limiting factor for a true 1 to 1 trans ratio measurement. Differential ratio plays a factor also 4:11 or 5+ whatever. You can not perform a proper pull because of your tire's limiting factor. Not safe because of the loading on the dyno and rotational speed. Your numbers are about right for your engine combo, overall gear ratio and drivertrain loss. A turbo is only as eficient as to how much it heats the air charge for your application.[/QUOTE]

 

[dillard09]

As some have stated **** injection would def help but its more things to have to worry about. Keeping another tank full. I was hoping for some decent numbers on 93 just like Guy was.

 

[Guy]

your FMIC and ported heads should help. Maybe you still get to 550

Well Guy and I have been talking alot. We both have the same setup except I have a forged RMB stage 2 motor, ported heads, and XDI HPFP. I need another 800 miles to make 1000 miles before I go to get my dyno tune. I will report back what I come up with. Not expecting much more that what Guy got to be honest but who nows.

 

[dillard09]

your FMIC and ported heads should help. Maybe you still get to 550

Oh thats right and my FMIC is bigger. Well if I reach 550hp I wonder what my torque will be at?