6.7 Twin Turbo Setup

swinky · May 17, 2014

bigrpowr said:
Yeah and a 6.4 is like 1150.

Soo is there an advantage in tuning?

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bigrpowr · May 17, 2014

swinky said:
Soo is there an advantage in tuning?

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You don't have a Tcm.

Six_Sloww · May 17, 2014

bigrpowr said:
You don't have a Tcm.

It's obvious too, when you drive the two back to back. The 5r in the 6.4 downshifting and part throttle manners are worlds better. Only time I feel like my 5r in my 6.0 knows what to do is from a dig full throttle.

Pizza pig · May 17, 2014

Six_Sloww said:
It's obvious too, when you drive the two back to back. The 5r in the 6.4 downshifting and part throttle manners are worlds better. Only time I feel like my 5r in my 6.0 knows what to do is from a dig full throttle.

whose tuning your truck?

swinky · May 17, 2014

Six_Sloww said:
It's obvious too, when you drive the two back to back. The 5r in the 6.4 downshifting and part throttle manners are worlds better. Only time I feel like my 5r in my 6.0 knows what to do is from a dig full throttle.

Exactly! From a 50-70 roll this thing has never been right. Fine from a dig.

bigrpowr said:
You don't have a Tcm.

Gayy. I thought a used 6.4 trans would hold in my torqueless 6.0 for sure.

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Jesse_01 · May 17, 2014

How much of a difference would going from 3.31 to 3.73 be on life of tranny?

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swinky · May 17, 2014

Jesse_01 said:
How much of a difference would going from 3.31 to 3.73 be on life of tranny?

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Makes it easier on it.

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4EverBoosted1 · May 17, 2014

Mine is a 3.31

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Jesse_01 · May 17, 2014

I am finding I am driving in tow haul all the time to keep the rpms up. I am only running 325/65r18. The 37" + guys must really noticing it. On the highway I have no need for the 6th gear.

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SAK · May 18, 2014

3.55's and 38's = 1550 RPM @ 75 MPH

Dan · May 18, 2014

SAK said:
3.55's and 38's = 1550 RPM @ 75 MPH

4.30 and 38's = 1910 RPM @ 75 MPH

Dan · Jul 7, 2014

Old engine spun mains, new shortblock is being built by tadd should be ready in about 5 more weeks, I'm super anxious to get er back together!! Then when tadd has girdle and billet main caps, I'll be looking to go that route!

Craig@MFI · Jul 7, 2014

Spun the mains? That's really odd seeing as many others have not had this problem? Maybe you should look into a oil cooler delete this time to keep those temps down seeing as if the block was filled it most likely blocked the coolant supply to the oil cooler and was only getting coolant pressure and no flow to it

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Dan · Jul 7, 2014

Sign me up Craig! Haha

Oil temps were hot, and likely a contributing factor...

I'll pm you regarding that block off plate you have available!

Meniacal_Mark · Jul 8, 2014

Ahhh I wondered how long it would be before someone made a girdle.

Dan · Jul 8, 2014

Meniacal_Mark said:
Ahhh I wondered how long it would be before someone made a girdle.

Should be available towards the end of this year, I don't want to be that guy, but look at the Dmax boys... They all have girdles!

Can't build a sky scraper on a cinder block

bricewise · Jul 8, 2014

Glad your pushing the boundaries for everyone else. It makes our lives cheaper and easier. However I'd be curious what made you land on needing a girdle?

Dan · Jul 8, 2014

bricewise said:
Glad your pushing the boundaries for everyone else. It makes our lives cheaper and easier. However I'd be curious what made you land on needing a girdle?

There's other guys out there pushing the limits as well and having very good luck!!!
Crank flex, block flex... Tie up the loose ends with a girdle... Rigidity is fairly key... And yeah I know, cross drilled 6 bolt mains with that graphite iron block should help things, but put me behind the wheel 6th gear on spray with overly hot oil... It's a party for everyone!

Like I say you can't build a skyscraper on a cinder block!

4EverBoosted1 · Jul 8, 2014

Dan said:
There's other guys out there pushing the limits as well and having very good luck!!!
Crank flex, block flex... Tie up the loose ends with a girdle... Rigidity is fairly key... And yeah I know, cross drilled 6 bolt mains with that graphite iron block should help things, but put me behind the wheel 6th gear on spray with overly hot oil... It's a party for everyone!

Like I say you can't build a skyscraper on a cinder block!

Are you sticking with your turbo setup? making any changes to the performance parts at all?

Fast-6.0 · Jul 8, 2014

Craig@MFI said:
Spun the mains? That's really odd seeing as many others have not had this problem? Maybe you should look into a oil cooler delete this time to keep those temps down seeing as if the block was filled it most likely blocked the coolant supply to the oil cooler and was only getting coolant pressure and no flow to it

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When I fill a 6.7 block I don't restrict the water to the oil cooler. Especially when I know they will be running a factory oil cooler. That would just be foolish!

The oil temps may have been high, and yes I do agree that the oem oil cooler is lacking, but the main bearing furthest from the oil supply showed no signs of lack of lubrication.

I also confirmed the failure with two race shops and the consensus was crank flex.