**CHALLENGE** - TURBO LAG TEST using a log

[MarkBroviak]

Is that with this new moddified 4094 based turbo that your still testing?

Yes it is!

Muff-Trying to figure out how to fix the turbo tuning issues for the LMM/LML trucks since it appears it won't happen with software. I decided to see if I could do it mechanically with the turbo itself since I figured out why the computer wigs out and throws the reduced power light bs. So far so good!:thumb:

 

[minerigger]

Well hot damn Mark! That thing is a monster.

Any idea what the price would be on one of these? Possible release date?

 

[andy-stevenson]

Can you do the same modifications to a 72mm if it's a 4094 base?

 

[thunder550]

3.025 sec on my S475 over stock setup, only holding 22k rail.

 

[MarkBroviak]

Can you do the same modifications to a 72mm if it's a 4094 base?

That's the hope and plan. With out testing I don't know how that's going to react, but we will see very soon. I plan to swap my 68mm wheel and cover for a 72mm to see what happens on stock fueling. I got Kyle Harbin installing these parts in his 72mm to see if it is going to be a good thing or not.:thumb:

 

[minerigger]

What converter would you recommend guys run for this moddified 4094/or the 3794? Also earlier someone asked about spool up on the 3794...how much difference is there between the 65 and the 68 wheel on that one? Seriously debating going back to vvt turbo

 

[MarkBroviak]

I personally like tight convertors like the 1056 so your not wasting energy and putting the power on the ground. On the 3794 it will spool alittle faster with the BMW 65mm wheel and is a better choice for stock fueling and stock motors for best all around performance. The 68mm version is capable of more topend power and flow specially in a twin setup on a built motor.

 

[andy-stevenson]

That's the hope and plan. With out testing I don't know how that's going to react, but we will see very soon. I plan to swap my 68mm wheel and cover for a 72mm to see what happens on stock fueling. I got Kyle Harbin installing these parts in his 72mm to see if it is going to be a good thing or not.:thumb:

Have you got anybody throwing more fuel at this modded 4094 to see what it's max potential as a single is?

 

[minerigger]

I personally like tight convertors like the 1056 so your not wasting energy and putting the power on the ground. On the 3794 it will spool alittle faster with the BMW 65mm wheel and is a better choice for stock fueling and stock motors for best all around performance. The 68mm version is capable of more topend power and flow specially in a twin setup on a built motor.

Is this due to the fact that they spool/light so quickly? I ask because I've currently got a 1058 and don't want to create another issue for myself

 

[MarkBroviak]

Have you got anybody throwing more fuel at this modded 4094 to see what it's max potential as a single is?

Not yet, I'm still in that process of testing.

 

[MarkBroviak]

Is this due to the fact that they spool/light so quickly? I ask because I've currently got a 1058 and don't want to create another issue for myself

Yes, because it makes so much more hp at a lower rpm(tons of torque because of it) and that's what gets the job done. It's all about where your combo makes its power and how you want to use it.

 

[minerigger]

Good to know. Thank you for the input Mark.

 

[Chevy1925]

Bumping this back up.

Russ, did you ever get some logs of the 64.5 before you sold the truck? its got me curious about putting one on my truck . im going to get a log of the truck on the way home with the 480 on there since it seems i never did it.

 

[DMAXchris]

As soon as i read this i thought of this thread. Lol

http://jalopnik.com/dear-automakers-please-stop-making-turbos-suck-1688464610

 

[Chevy1925]

lol he clearly likes big turbos with lag

 

[chevyburnout1]

Well hell I have a whole new setup since my last post in here! Looks like I need to get another log!

 

[coker6303]

Did the lag test with my LML finally. Best out of 3 on each

0-20psi from idle is 1.98sec
1500rpm 5th gear cruise +20psi 2.575sec

From an idle, even with traction control off its like it hesitates a sec before actually fueling and making power. Lights fast, just takes a sec to respond it seams.

Max effort tune (daily driven)

How's this rank to other LML's?

 

[malibu795]

need to get this done on my lmm with 4088

 

[coker6303]

I need to get the list caught back up. Never enough time but I'll get on it soon

 

[malibu795]

Here is a link to the excel file from the current results. Feel free to update your results or post them and I will update them to the file.

https://drive.google.com/file/d/0B_5kLqaBtIOdcmRVWXhXQVE3a1U/edit?usp=sharing

Once we get a few more logs I can throw them onto a graph and it might help view the variations a little better.

screen shot

LMM finger pistons .040 over
inj stock
cp3 stock
trans stock
tune 1700uS @21* @ 26,000psi
GT4088R .85 T3
tires 225/70/19.5(steel rims)
ambient temp 70*F
elevation 1000'
0-20psi avg 3.18..
1500 roll not happening in 5th gear.. I barely hit 15# pulling a grade at 2000-2100rpm and full throttle @ 30,000lbs light haze for exhaust

boost sweep is slower than stock charger. though truck is more responsive at part throttle applications with the 4088 vs stock VVT