71mm

smokinstroker · Jun 25, 2014

I guess it really depends where you are. Altitude can be that deciding factor for sure!
Sea level always puts a bigger smile on your face!

johnp115 · Jun 25, 2014

bft blue oval boys said:
Wtf? What's wrong with it?

Sent from a Cummins plant, driving a Powerstroke, with a TDI on the side!

Siezed/melted/expanded glow plug or something. It won't allow for the deal to pop all the way down and is causing a little oil to come out the valve cover.

I'm hoping somehow I can remove it with nothing breaking off and falling down..

http://powerstrokearmy.com/forums/showthread.php?t=52657

getstroked27 · Jun 25, 2014

smokinstroker said:
I guess it really depends where you are. Altitude can be that deciding factor for sure!
Sea level always puts a bigger smile on your face!

agreed. i currently live at 120 feet or so. its so cherry. i lived in the snowy mountain range in south eastern wyoming, town was at 8200 feet.... no bueno there

Jeff@Spartan · Jun 25, 2014

smokinstroker said:
There are also very few accounts of people breaking 12.3 on stock fuel with a 71-71mm and no nitrous.

I was also basing it off elevation in Maryland which is ~3,000ft.

3,000 feet? Maybe up on the tallest peaks.

Truck weight has a lot to do with it too. It's possible to get a crew can down to 7600 lbs or so if you're willing to go that far with it. I got mine down to 7620 without messing with the interior.

johnp115 · Jun 25, 2014

Maybe west part of Maryland.. But the majority of it, like eastern shore, southern md and mid md is all surrounded by the bay and rivers and less than 140

Mike@MPD · Jun 25, 2014

Maryland is sea level. 12.1 with a single 72 on stock fuel

Sent from my SM-G900V using Tapatalk

Jeff@Spartan · Jun 25, 2014

johnp115 said:
Maybe west part of Maryland.. But the majority of it, like eastern shore, southern md and mid md is all surrounded by the bay and rivers and less than 140

Mike@MPD said:
Maryland is sea level. 12.1 with a single 72 on stock fuel

Sent from my SM-G900V using Tapatalk

Exactly.

Mike@MPD · Jun 25, 2014

Multiple low low 12s

Sent from my SM-G900V using Tapatalk

travisH3 · Jun 25, 2014

I'll try lowering tire pressure and see what it will do. i believe i was at like 55psi. I already have traction bars. the mickey thompson atzp3 are also a more aggressive all terrain so hopefully they will bite okay.

sootie · Jun 25, 2014

ya-drop your pressures waaay down. also, it may help to launch off rpm not boost. 1750 rpm seems to work well.

smokinstroker · Jun 25, 2014

Mike@MPD said:
Maryland is sea level. 12.1 with a single 72 on stock fuel

Sweet!

I didn't notice that he was south Maryland. Those are good times too!

ONEFASTSTROKER · Jun 25, 2014

I thought a 71mm lp would be faster ..thought it added around 100hp

Jeff@Spartan · Jun 25, 2014

ONEFASTSTROKER said:
I thought a 71mm lp would be faster ..thought it added around 100hp

I saw a 47 horsepower increase.

594 uncorrected to 641 uncorrected. Same dyno.

johnp115 · Jun 25, 2014

ONEFASTSTROKER said:
I thought a 71mm lp would be faster ..thought it added around 100hp

That's like saying a tune adds 300, it just doesn't correlate like that.

ONEFASTSTROKER · Jun 25, 2014

100hp is what I seen some companies clam. I think a tune would have to add around 300hp if 6.4 is rated 350 at the crank to make 570ish at the wheels with a tune.

B585Ford · Jun 25, 2014

SPARTAN said:
I saw a 47 horsepower increase.

594 uncorrected to 641 uncorrected. Same dyno.

Yours is one of the only same dyno before and after numbers I have seen, but based on a lot of peoples accounts, that seems like a pretty good average increase (maybe a few more than "normal" but your truck was a bit of freak anyways).

Jeff@Spartan · Jun 25, 2014

ONEFASTSTROKER said:
100hp is what I seen some companies clam. I think a tune would have to add around 300hp if 6.4 is rated 350 at the crank to make 570ish at the wheels with a tune.

What companies?