Upgraded to 75 atmo, same mph at track. Thoughts?

forcefed6.4ford · Sep 7, 2015

Just throwing a bigger atmo on doesn't mean you automatically going to make more power. You need more fuel to get the most out of that turbo.

Rmartin-97 · Sep 7, 2015

Powerstroke Man 6.4 said:
Stock fuel? maybe you are not pushing the 75 hard enough?

What he said.

Rubenk · Sep 7, 2015

forcefed6.4ford said:
Just throwing a bigger atmo on doesn't mean you automatically going to make more power. You need more fuel to get the most out of that turbo.

Rmartin-97 said:
What he said.

Yea I get that bigger turbo doesnt mean instant power. But every review and discussion on the big drop-in show gains with them over the 71-73s.

Guys with 71/72's have gone faster than me with less mods. No doubt 75/76 will benefit from more fuel, but it just seems like i'm not even making the power I should yet.

forcefed6.4ford · Sep 7, 2015

Don't forget you are trying to shove much more air through a stock vgt inlet. Coupled with a larger exhaust housing on the atmo there isn't quiet as much bite for the turbine. It all works together

sootie · Sep 7, 2015

forcefed6.4ford said:
Don't forget you are trying to shove much more air through a stock vgt inlet. Coupled with a larger exhaust housing on the atmo there isn't quiet as much bite for the turbine. It all works together

fact is that robbie martin and jeff dodd have gone faster with less turbo

Rubenk · Sep 7, 2015

sootie said:
fact is that robbie martin and jeff dodd have gone faster with less turbo

Also true, I have friends running the same 8th as me with tune/deretes in 8000lb crew cabs.

forcefed6.4ford · Sep 7, 2015

Why don't you buy my old one and throw it on. You need more fuel to make that 75 sing. The exhaust housing is larger on the 75 then a 71 or 72 so with the smaller drop in you get more work with less flow.

Mine pulled like a freight train but I had larger injectors. Fuel dude.

Rubenk · Sep 7, 2015

forcefed6.4ford said:
Why don't you buy my old one and throw it on. You need more fuel to make that 75 sing. The exhaust housing is larger on the 75 then a 71 or 72 so with the smaller drop in you get more work with less flow.

Mine pulled like a freight train but I had larger injectors. Fuel dude.

Old one what?

6.4 Stroker · Sep 7, 2015

How high of backpressure are you seeing?

webb06 · Sep 7, 2015

sootie said:
fact is that robbie martin and jeff dodd have gone faster with less turbo

I agree with this. The turbo can't be the issue. There's something else

Sent from my iPhone using Tapatalk

jcain · Sep 7, 2015

Rubenk said:
Had a chance to run against Jcain's 6.7. He dynoed 661hp at Scheids. He is on 37s(I'm 32s) and is about 1000lbs heavier. We were dead even until very top end I'd barely start pulling away.

Really doesn't seem like I'm making the right power.

I'm only in 35s on 20" wheels(2.5" lift too)
It was very even from a 40mph roll til the needle stopped and then Ruben started inching away on me.

bigrpowr · Sep 7, 2015

i would watch back pressure. it's prolly very high .

Rubenk · Sep 7, 2015

That last truck pull vid I posted is good data to look at. It only sees 67 psi EBP. I'm gonna get my wastegate on and see how messing with VGT affects things.

My bad JCain, thought it was 37s.

jcain · Sep 7, 2015

Dual fueler, quit playin...

Rubenk · Sep 7, 2015

jcain said:
Dual fueler, quit playin...

Lpfp, duals and 100% seems like a reasonable next step. Hah.

jcain · Sep 7, 2015

I concur... as long as it's still "work stock"

bigrpowr · Sep 8, 2015

Rubenk said:
Lpfp, duals and 100% seems like a reasonable next step. Hah.

NOT 100's ... LOL

Rubenk · Sep 8, 2015

bigrpowr said:
NOT 100's ... LOL

ALL THE NITROUS!

Rubenk · Sep 14, 2015

Running a new tune with a little more timing and it feels a little stronger. It was 55 degrees Saturday night and peak boost was 52psi. Hope to get new track times this Friday and see how the timing helped.

We tried more PW too, but rail pressure drops to 23k and PW on the minaxx says 2298us at WOT even though tune commands 2400.