6.7 daily/dyno contest what turbo

CHDiesel

CHDiesel

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I've already spent days searching forums and articles with no direct answer or solid argument.

I'm putting together parts to 2nd gen swap my 6.7, hoping for fastest spool streetable 650hp with a tune for 800hp smoke free for local dyno contests. Plan on doing fuel shortly after. I drive 70mi a day for work, and occasionally tow about 20k

I can't decide between s465, s467.7, or s472. They all come with 74.3mm turbine exducer with 83mm OD.

The major differences are the compressor inducer and exducer. How much of a difference is there spooling with all having the same exhaust side? At what hp does that turbine with .90 AR become restrictive or inefficient? 1.0 AR? Is there a rule or formula about compressor to exhaust size for my application?
 
467.7/87/.90 or 1.0 Smoke will depend more on your tune, injectors size, and air flow improvements.

If you really want more info I would call someone who builds turbos. For the fastest spool, least smoke, and most streetable power I would recommend compounds.
 
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SPEEDSHIFT said:
467.7/87/.90 or 1.0 Smoke will depend more on your tune, injectors size, and air flow improvements.

If you really want more info I would call someone who builds turbos. For the fastest spool, least smoke, and most streetable power I would recommend compounds.
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I plan on doing big injectors with conservative tuning to keep smoke down.

I just want to have enough turbo to keep smoke to a haze on my dyno contest tune. I'm not experienced in efficiency maps, but want daily 650ish hp close to center without 800hp being too far out.

Compounds are kind of pushing my budget, and I want to keep efficiency up and drive pressure low. Plus I've heard these 6.7s can push a lot of turbo.
 
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Never driven either so cant give you a comparison. I would think the 87mm .90 would spool faster and give you more top end than the 83mm 1.0.
 
467.7 / 87 .90 with a big gate. It will street drive really well and you can spray enough nitrous to go 4 digits if you have a big enough injector.


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khaoskustoms said:
467.7 / 87 .90 with a big gate. It will street drive really well and you can spray enough nitrous to go 4 digits if you have a big enough injector.
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Spray might be in my future, but I want to be around 800hp fuel only. Is the gate necessary for 800hp on that turbo, or is that what I will need for 4 digits down the road without going to a bigger turbo?

I was looking into the steed competition mani with the wastegate port for easy future upgrades.
 
_stvnmllr said:
This is old but pretty much what your asking about and it's a 5.9

Dyno tuned my 06 at fleece - Competition Diesel.Com - Bringing The BEST Together
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Seems exactly like what I'm looking for. I'm worried about towing 20k+. I rarely ever do it, but I don't want to hurt anything.

Also curious is a 650hp daily tune would be too small and snuff the turbos out or be too hard to tune with that big of a charger.

Wonder if there is anyone around NW Montana, N Idaho, E Washington areas that could take me for a spin in a similar setup.
 
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I'm sure there is. 467.7 has been done so many times. Check out greg a on YouTube. He has a 2008 with a 2nd gen swap and 467.7 stock fuel and it was his tow rig until recent

Carlholcomb said:
Seems exactly like what I'm looking for. I'm worried about towing 20k+. I rarely ever do it, but I don't want to hurt anything.

Also curious is a 650hp daily tune would be too small and snuff the turbos out or be too hard to tune with that big of a charger.

Wonder if there is anyone around NW Montana, N Idaho, E Washington areas that could take me for a spin in a similar setup.
Click to expand...
 
Yeah I think we are veering into the realm of what everyone else is doing. I'm sure I can dig up tons of info on 467.7 swaps.

Another thing I've looked into but can't find much info on is the Stainless 5 blade Mafia wheels.
Would they give me a more streetable curve with less lightswitch tendency?

You would think with fewer full blades it would make less boost right away and move a little more air up top, making it more gradual. All the other posts on them I've seen are hearsay or seat of the pants guesses, with very little useful information or sample sizes.
 
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Justappumped24v said:
So far I’ve towed 14k on a 476/87/1.0 T4 in a 05 3500 with a 6.7 engine. Not awful but took some skill on leaving a light
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That's with a G56 right? How do you think a 68rfe would react? Maybe with a new cam and 100% overs, but a tighter than usual torque converter?
 
Carlholcomb said:
Yeah I think we are veering into the realm of what everyone else is doing. I'm sure I can dig up tons of info on 467.7 swaps.

Another thing I've looked into but can't find much info on is the Stainless 5 blade Mafia wheels.
Would they give me a more streetable curve with less lightswitch tendency?

You would think with fewer full blades it would make less boost right away and move a little more air up top, making it more gradual. All the other posts on them I've seen are hearsay or seat of the pants guesses, with very little useful information or sample sizes.
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5 blades result in better low end and less top end.

Race cover 466/83/1.0 would be perfect for you.
 
blackmega3500 said:
5 blades result in better low end and less top end.

Race cover 466/83/1.0 would be perfect for you.
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Ive always heard the opposite about 5 blade, but I'm not turbo guru.

I always figured that more blades would be able to grab more air and push it harder at lower speeds, but when it spools up there would be a slight vacuum behind each blade where air isnt fast enough to move in, and the more blades the more vacuum. Also more blades would put them closer together so they would basically be drafting off eachother the with less space or time for air the higher the blade count.

Not a physicist either, so I could be wrong, but thats what I got from other threads.
 
I'm running a 467.7/83/1.10 fmw as a secondary in compounds. I started with a .90 and moved to the 1.10 because of drive pressure and it seems to spool about the same or better with the bigger housing, but on a ragged 12v anyway.
 
Carlholcomb said:
Ive always heard the opposite about 5 blade, but I'm not turbo guru.

I always figured that more blades would be able to grab more air and push it harder at lower speeds, but when it spools up there would be a slight vacuum behind each blade where air isnt fast enough to move in, and the more blades the more vacuum. Also more blades would put them closer together so they would basically be drafting off eachother the with less space or time for air the higher the blade count.

Not a physicist either, so I could be wrong, but thats what I got from other threads.
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They make boost faster due to more available volume, but loose top end efficiency. Theres a reason other builders don't use a 5 blade, and even went back to the 7 blade design from the 6 blades.

Do you think you'll make
 
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