Slapped around by a powerstroke

bigbird

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I’ve had a couple fairly quick Dmax’s over the years. Currently have an LBZ and a 2017 F350 platinum. No Duramax without a built trans will keep up to a deleted and tuned powerstroke. My truck is deleted, tuned and a lift pump and supposedly is around 600-630 hp. It is dead even with my wife’s SRT 8 Cherokee from a roll.
 

Bdsankey

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How can ford get 630 out of a cp4 while gm can only get 500?
Different turbos, different pumps, different head flow, much more efficient intercooler design (water-to-air has a much better heat transfer rate than air to air), different cam profiles, ford has an electronic supply pump whereas GM does not etc.



All those little things add up, its not just the difference between the pumps.
 

Josh154

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Just prevents it from draining the rails on a higher pulse width tune. Keeps positive fuel pressure at the cp4 so it doesn’t have to work as hard drawing fuel from the tank
 

bigbird

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How can ford get 630 out of a cp4 while gm can only get 500?
Before I put the lift pump in, if I got on it with the big tune it would throw 0087. Now it’s no longer an issue. I have no clue why the Ford’s stock can make more power. Not positive, but didn’t stock turbo twin guys make 600-650 on stock CP4 If so, it’s not the CP4
 
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Josh154

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Yes. I swapped to a sportsman cp3. Cp4 runs out of fuel around 500whp. Sportsman should do 650 easy. Stock lbz cp3s doing 650-675. Lml injectors are more efficient and return less fuel as well. Cp4 is your first bottle neck then turbo. I should be 580 but that’s pushing the stock turbo pretty dam hard
 

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