[condoraircraft]

Greetings!
I've got a BW 366/74/.80 waste gated turbo on my RAM. I would like to know the opinion of you guys about my Turbine housing:
I am thinking of replacing it for a non-wastegated .84 divided, or .91. Do you think I will get quicker spools? Lower or higher EGTs?

 

[lvramcummins]

I'd go with the .91

You've got a lot of fuel. Enough to max out that 66. What's the 14mm pump rated to flow? I didn't know Shane would stroke one out that much...

 

[condoraircraft]

Thanks lvramcummins!
Yep, did mine in 2012 or early 2013 can't remember. Was going to go with a twin CP3 but rather use one stroked. He usually does 11mm but will go all the way up to 14. I've got the flow test papers at home and will let you know the exact flow.
As for the Turbo, I've sure got loads of fuel for the turbo I've got.
I keep my tuning to a street level so I don't hurt my EGT's (on Drag/Race it will pass 1600F fast!). For now I will go with a non WG .91 or something like it to lower my EGTs, but planning on running a 60 or 62 over a 488.

 

[lvramcummins]

Yeah I'd like to know what it flows. I know my 10.6 will flow 284LPH and that's enough to scratch 1000HP if you have enough air. A 14mm will flow 350ish if I had to guess.

Are you sure about a 60 or 62 over an 88? You're going to to have a pretty big e-gate to make that work. most setups with a primary that big usually use a 66 or bigger secondary.

 

[condoraircraft]

I remember it being something in the 300LPH area. I opted for bosch motorsports/exergy 150's (instead of the 200HPs mu CP3 is capable of handling), as I had plans to keep on the 800HP range after a bigger turbo.
I have put my truck on a dyno once, as no one here will let me use their little dynos and put my 2500 RAM on top of it, plus the guys that have dynos are H&S and Bully dog Dealers and wouldn't like to see a real HP/Torquey truck dismantle their 550HP advertising! Hahaha!
I've hit 900ish on my Drag/Race peak HP, but have done 850something with a lot more flat torque curve with a little milder on fuel tuning though due to lack of air.
I have to find those papers and get the flow to you... I believe it is worth without messing with twin CP3's, plus never had an issue with it and it is my daily driver.

Talking about daily driver, you are right on the turbos. Looking at the factory flow charts at turbodriven.com, there is going to be a big gap looking at the 488's airflow graphic.
I would rather have something with stock down low torque and a good flat curve all the way to the top, so I might just go with a 60 or 62mm/68 with either a 475 or my 366 with a 1.01 turbine housing or something like that.

What do you think?

Thanks!

 

[matt197]

you made 900hp with a 66mm?

 

[Black Diesel]

You have a lot of pump for those small injectors. I think it'd be cool to run a pump like yours with my injectors :stirpot:

Anyway you could swap to the .91 housing but you'd probably benefit more with more low end with something like a 63/480 setup. Just a suggestion. I ran the exact turbo you have (66/74/.91) on stock fuel on my 06 before the rebuild and it was fun.

I'm assuming this is a 6.7 pump stroked out. If you wouldn't mind PM'ing me the flow specs and maybe what you paid for that pump?

 

[cummins04.5handshaker]

A 60 or 62 secondary can hit a lot higher then most people think. It doesn't take a large secondary to hit that.. It does help with the exhaust side to be a T4 and a large .91 and using an e-gate and it really doesn't have to be a huge e-gate. 38mm-42mm e-gate would work.

Blacksmokinwilly's truck put down just over 1000hp with his triples and the secondary on that setup is based off an S200 57-58mm with 2~66mm primaries. He also did it on Shanes 10mm stroker and 130% overs. Just gonna throw that out there..

 

[Black Diesel]

A 60 or 62 secondary can hit a lot higher then most people think. It doesn't take a large secondary to hit that.. It does help with the exhaust side to be a T4 and a large .91 and using an e-gate and it really doesn't have to be a huge e-gate. 38mm-42mm e-gate would work.

Blacksmokinwilly's truck put down just over 1000hp with his triples and the secondary on that setup is based off an S200 57-58mm with 2~66mm primaries. He also did it on Shanes 10mm stroker and 130% overs. Just gonna throw that out there..

Question, in a triple turbo setup, isn't the combined primary side usually consist of two turbos smaller than the secondary? (Example: primaries are 2 63mm turbos and secondary is say a 66?) doesn't make sense to me to run 2 66's (that combined can flow what a large s500 can flow) into a small 57mm turbo?

 

[cummins04.5handshaker]

Question, in a triple turbo setup, isn't the combined primary side usually consist of two turbos smaller than the secondary? (Example: primaries are 2 63mm turbos and secondary is say a 66?) doesn't make sense to me to run 2 66's (that combined can flow what a large s500 can flow) into a small 57mm turbo?

Not usually. Most of the setups are a typical small fast spooling secondary with 2 rather larger primaries. In a drag racing setup it's the other way around mainly b/c the small secondary isn't going to hold together with nitrous and fast spooling secondary isn't needed drag racing. That's why most guys run big singles. They can sit and spool it up however long it takes haha

 

[D2'd]

Going with a large(ish) secondary defeats the purpose of compounds or triples as far as daily driving is concerned. You need that 1500 rpm range to come alive as fast as possible and that small secondary is perfect for that. If it"s race only, everything changes.

 

[condoraircraft]

you made 900hp with a 66mm?

Yep... peak... huge EGT's and terrible torque line though... at a lower fuel setting, still peaking near 1.600F EGT did 850 something or 60something... with a lot better torque curve. Got a lot of fuel available, but not much air, that's why upgrading to a twin setup and asking for help on my choice. Keeping it in the 800's/1.600Lb/Ft would be perfect with down low torque for city daily driving.

 

[condoraircraft]

Going with a large(ish) secondary defeats the purpose of compounds or triples as far as daily driving is concerned. You need that 1500 rpm range to come alive as fast as possible and that small secondary is perfect for that. If it"s race only, everything changes.

That's exactly what I need D2'd... low end torque to keep its OEM manners down low (of course with the mods I have it will be absurd down low) but also a little bigger primary than my 366 (475?)... or even keeping my 366 modifying it with a larger, non-wastegated exaust housing to keep my EGT's lower.

Any comments appreciated!

Thanks guys!

 

[3brorce]

Those egts really are not terrible at all, 1600*. I thought it would have been hotter to be honest.

 

[condoraircraft]

Those egts really are not terrible at all, 1600*. I thought it would have been hotter to be honest.

Phil... with the Drag/Race it sure went higher... but all my Autometer Phantom and Edge peaks at 1.600F... of course it went higher... on Hot Street it hit 1600F as well...
I've got fuel for a lot of potential to get high and flat torque curve with the right turbo setup... what do you guys suggest? By the way... the last tunes are great!

 

[3brorce]

Non gated compounds. Put the .91 on the 66 and throw a 480-488mm with it.

 

[condoraircraft]

Non gated compounds. Put the .91 on the 66 and throw a 480-488mm with it.

With my current mods (there is also a colt camshaft, 200lb springs not mentioned in my truck's description), do you think I will get good torque down at 1.500RPMs? Today I feel it coming in at 1.900RPM's then booom... it lights up like crazy...

 

[3brorce]

Really depends on what your power goal is in what you should do for air. I would swap out that gated housing on the 66 first and see what you think. Go from there.

 

[condoraircraft]

Really depends on what your power goal is in what you should do for air. I would swap out that gated housing on the 66 first and see what you think. Go from there.

Phil... I want to stay in the 750-850 range... We will probably have to make some adjustments on my tuning right?

 

[Black Diesel]

Going with a large(ish) secondary defeats the purpose of compounds or triples as far as daily driving is concerned. You need that 1500 rpm range to come alive as fast as possible and that small secondary is perfect for that. If it"s race only, everything changes.

Well I won't ever run triples so I personally do not care. I only asked because that is the smallest secondary I've heard of on a set of triples on these trucks. IIRC the triples on The Stig's mega was 2 63's and a 66. The argument is moot as like I said I do not care, just thought it was odd to have such a small, baby turbo being fed by 2 turbos that can out flow an s500 frame charger. Carry on.