So jason from treadstone said that the 5857 was ment for a v 6 in the fact that the cfm is greater but the turbo would not make good power after 25psi because the air would get hot......

but ive seen so many people on here with the 5857 and with the 5557 whats your opinion.

im going with a bullet proof build on the motor and the only thing that keeps me from 450whp imo is a built tranny that i wont be able to afford in this build.

im wanting to run high boost and im setting the rev around 7600 to 8000 and im wanting to spool by 4k

 

Well what does he think about a 6262, haha.
Turbo will be fine.

 

At 25psi on my 5857 im at 424whp spool around 4400

 

So are you at full spool or just startin to build boost at 4400?

 

That has to be full spool. I see 10psi at 3K on a 6262.

 

Awesome so is 450whp easily attainable with a 5857

 

Full spool

 

55 trim compressor wheel will spool quicker slightly quicker than a 58

 

5857 with a .63 ar will be fine in dual ball bearing i brought Cmillers turbo and he ran 10's with it, its a beats of a turbo and honestly if your build changes or power goals changes u have the potential plus percision offers upgrades, im considering the compressor upgrade to make my 5857 a 5862, you will def enjoy the turbo FF ace is running it and can give u 1st hand experience with it, Cmiller ran it and can give u experience as well, and from their reviws and what i researched i jumped on it when it became avail. you will be fine.

**** plus i think he made over 520whp on 30psi if im not mistaking so i dont see how ur not goin to make power over 25psi...i read srt4's running 32psi putting down crazy power, theres also a s2000 built motor and heavy modded making 560whp on 32psi.

 

Yea I also thought the 5857 will put down awesome power with high boost. I was also told 30psi would be a little much for a stock block but that's ok cuz from the looks of it I won't need 30psi to clear 440-460whp

 

Didn't they kill the 5857? Grab a 5858. For your HP goals and rev range I'd say 58 wheel. Even if it had a tad slower spool u will still have a good 4k rpms of beast mode

 

think so either way the 5858 is not gonna be that much worst then a 5857, he'll def enjoy it.

 

Yea I think I'll go with the 5857. I'm stoked to get this build started. Don't get paid my over time for almost another month but it will be like 3200 bucks and then I'm gettin 1200 from the totaled car then a 900 x mas bonus and on top of that I have a k04 (brand new for sell) and a td04 (4k miles) for sale and im saving 370 every paycheck I.e. every two weeks. So just this thru November will add up to 6840 total. I'm going all out with the build. Only thing is I'm stayin with a stock block but I don't need any thing else for the boost and power it will be making. It's a bullet proof build.


There's a lot of work to be done!

 

careful bout the going all out part numbers rank up fast my kit $1,500 my turbo $1,000 wastegate $230 lines n fitting $120, piping $325(got hooked up) you will need a maf relocate pipe n maf extension harness blow off valve $230+, going to need a tune maybe 3bar map sensors , i think some may still be running the stock ones maybe a cam upgrade and list goes on n on im up to 6k and i didnt get my block yet, oh also goin to need a clutch and new tires lol...and put money aside incase that tranny goes.

 

Agreed. I'd opt for the smaller trim 5557 and a larger turbine arrangement.

 

why not try one of the GTX turbos?

 

you dont pick turbos for the psi you are going to run you pick them for the engine size, power you want to make, and how. both could probably make the power you are wanting and would probably do it at a lower psi than you are thinking if you built the motor right instead of just throwing boost at it and hoping for the best . tell them what power you want to make and the main application and they should be able to tell you what turbo to use, not the other way around.

 

55 and 58 are not the trims. Those are the inducer diameters of the compressor wheel. Although in this case, the 5557 does coincidentally have a lower trim than the 5857 because the back sides of the wheels are close to each other in size.

 

I wouldn't go that route on the LNF. They don't respond the same as typical motors.

 

Sub'd

 

I am aware how PTE turbos read. We are a PTE MWD as well and have been for many of years.

I know this is a comp inducer diameter. I was using the word "trim" loosely in context.

55mm comp wheel inducer regardless of exducer bore will be smaller in size than a 57mm comp wheel inducer. The turbine arrangement on both of the turbochargers have the same turbine arrangement therefore the 5557 will have better throttle response. I stand behind my statement.

 

I quoted Treadstone in that statement, not you.

As far as the wheels, yes you can improve throttle response a little with the smaller compressor, but the LNF would respond better to a smaller turbine wheel. We also have variable valve timing, so we can avoid the otherwise increased chance of surge that can come into play by going in this direction on other motors.

 

Why do you say this? Smaller turbine wheels tend to choke off power and have the instant throttle response. If that's what's desired then I suppose that you can select that, but expect to feel the power drop off after say HARD after say 4K on a 6K redline.

I have done TONS of testing on turbine A/R selection on various apps, and my testing has always lead me to opt for the larger turbine.

 

And that is why I am pointing out that the LNF acts differently than what most people are used to. I am not disagreeing with your overall knowledge of turbo selection. I am just pointing out that the LNF leans more towards the smaller turbine wheel performing better overall more often than most other motors.

 

Do you have any results or data to share and compare?