CRP stage 4 build (lower than expected power levels)

[ddubdb3]

Sorry I don’t know the whole back story here. I’m just curious how much power and torque were you shooting for? Also did you look into the v8 swap waters?


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[Guy]

I wasn’t looking to swap. My goal was 550 horsepower and 575 torque.

Can’t even get close in the torque department and that’s the most disappointing of all.

 

[Raptor 2014]

Morning,

Stage 4 CRP turbos and manifolds, AMS intake tubes kooks downpipes and AMS turbo flange. Whipple intercooler and AFE CAI. 170 stat.

Excellent install. Great shop. Dyno tuning with a tremendous effort. 37 pcm flashes. Can’t say enough good things about them.

The power is lackluster. Invested probably 12-14 grand. I don’t want to bother with the math at this point.

507 horsepower and 478 torque at the wheels. Heat soaked and 5th gear pull. It’ll make a little more peak on a cold run I assume... So basically nearly identical to MPT.

The whole thing was limited by knock on 93 octane. 4.5 of timing advance. Lambda a little rich at .77 on WOT but not way off.

Is it faster than bolt ons with a tune Yes. 447 on the same dyno. Is it noticeable? Some.

was it worth the money invested? No.

Is there a little more power in a hotter tune? Yes, but the power increases I think will be modest — and this shop tuned it for safety.

The dyno graphs from Five Star are not able to be reproduced - and no response from CRP as of yet.

At this point I can’t recommend these turbos and parts for the time and investment. If my opinion changes after some tune adjustments I’ll let you all know, but as of now this is where I stand.

I refuse to post the dyno plot as I’m just totally disappointed.

Sounds about right for a 5th her pull at a 1.5 to 1trans ratio

A pull in 4th or even 3rd would net better numbers -

 

[Guy]

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.

Sounds about right for a 5th her pull at a 1.5 to 1trans ratio

A pull in 4th or even 3rd would net better numbers -

 

[magaraptor]

I’ve done all the same mods an same results, an my turbos came from Ryan. Not worth the money

 

[Guy]

Wish I would have known! For goodness sake!

I’ve done all the same mods an same results, an my turbos came from Ryan. Not worth the money

 

[Kaz109]

This is disappointing to hear. It goes against every turbo car I have modded in the pasted

 

[WARP6]

I've been down this road in the turbo Buick world. Knee jerk thoughts are that fuel is limiting your ability to see what the hard parts can really do. I can honestly say that methanol injection was the single best mod I ever made to my car. 27psi boost on a 72mm turbo, Champion aluminum heads with their CNC port work. Matching intake, stroker bottom etc. This car is a puppy on straight pump gas as the boost has to be turned waaaaay down. With 93 octane pump gas and a dual nozzle Alky Control kit it's a friggin beast. I can only imagine your truck would act the same.

It's definitely a kick in the nuts when you invest so much time and money and get negligible gains. Props to you for sharing this information and your experience. I hope you find the limiting block in your combination

 

[Guy]

Ethanol or **** injection would help a lot but the goal was to try to get competitive with a TRX on pump gas.

not possible.

like I said I do have another guy.... seems like a great guy.... experienced tuner... he’s going to work with me to try to get what we can get... I’ll update when I do... but I have no expectations the gains will be anything more than modest over what I have now and have no unrealistic expectations.

 

[WARP6]

Ethanol or **** injection would help a lot but the goal was to try to get competitive with a TRX on pump gas.

not possible.

I don't think so either just from the physical size of that boosted engine. Methanol is relatively inexpensive to add in the grand scheme of what you've already invested. I think it could only then be able to compete with a stock TRX. Once the mods start hitting those trucks, forget about it