:eek:

I'm ghetto. Have been always will be. I ordered gauges awhile back and am still waiting for their arrival. But I REALLY wanted to know how much boost my LLY was putting out. So I stole an air pressure gauge out of a CMM machine I'm rebuilding and ghetto'd it into the truck.

At 2000 rpm 1/4 throttle accelerating, 20PSI.
At 2500 rom 3/4 throttle accelerating, 40PSI.
At 2500 rpm full throttle, 45PSI and flickering (VVT?)
Readings are after intercooler.
NO overboost codes.

This was TTS Level 2 + VA level 3.

Giddy Up! :eek:

How much boost can these LLY's make??

We need MORE FUEL!!!! For those buying gauges, 35PSI ain't going to work.

How does it run with that stacked combination? Whats the Horsepower on that? My lly only pushes 30 with the NOS down the track.

PS - I might even go higher. Stay tuned.

Runs pretty smooth. No rattle, no surging. Might dyno tomorrow, and I have another module to test at the same time. Seen a similiar (Predator 100 + VA) truck dyno at 440 a couple of weeks ago.

I'm going to try and make it rattle. ;)

I would like to try that combination to see how mine will run, i just need the $$$, whats the prices on the VA and the TTS? and what are they? harness? Tuner? computer swap?

I've seen afro-engineering before..hell, I'm guilty of it quite often....But, dammit pat, mounting a gauge above the wiper blade?!?! http://www.dieselplace.com/forum/images/smilies/hihi.gif

It's VERY hard to read when it's raining. I look like one of those wobbly head dogs trying to read it.

I've seen afro-engineering before..hell, I'm guilty of it quite often....But, dammit pat, mounting a gauge above the wiper blade?!?! http://www.dieselplace.com/forum/images/smilies/hihi.gif

Actually ON the wiper blade. I was in a rush and only had 3 feet of hose.

Wish I had a pic of the DVM I had taped to the windshield when I was looking at VVT position sensor output... :) Pat, you would have been proud.

'McRat - Proud of you for that install - had the fuel pressure gauge on my racecar in a similar place.

Pat

Haven't you learned not to put things in plain sight? They tend to disappear.:eek:

Pat

Haven't you learned not to put things in plain sight? They tend to disappear.:eek:

:rolleyes:

Your FuseGrips ain't going to save you next time. I figure I won't need the bottle no more. Just need a little more fuel; got plenty of air. :D

And I think I might have found the fuel I was looking for... :muahaha:

"At 2000 rpm 1/4 throttle accelerating, 20PSI.
At 2500 rom 3/4 throttle accelerating, 40PSI.
At 2500 rpm full throttle, 45PSI and flickering (VVT?)
Readings are after intercooler.
NO overboost codes."

thats some great numbers, never in gods life would of thought the vvt would make that type of boost, so then what is the big difference in why the hp is so much lower, than the lb7
this last weekend at the dyno day i seen two lly fill the shop with smoke on a stack, and fight to make 400hp, you think if they were making the boost your talking about, they should be way higher in hp,than the lb7 i only make around 33psi and go to low 500hp on that, one guy(lly) had propane and seen no increase on the stack, i seen another 60hp on the stack, could their be a difference in the heads then(restricking air), or just ecm tunning, or emisions hold her back

Depending on Drive Pressure, Map Width and Adiabatic Efficiency, more boost does not always equal more power..... it sure would be nice to have the full specs of the Garrett Turbo on the LLY

We need more fuel for the LLY's. If the EGT's don't get crazy, at 45PSI, we should be able to hit 550rwhp if we can get enough fuel in there. Right now, 440 worth of fuel is all that is available.

Big questions though... Will the turbo live at 45PSI? Or 50PSI? How much will the head gaskets take? How high will the EGT's go with lots of fuel?

What I do know is that it does NOT smoke at 40PSI and higher. Stealth technology.

I would like to try that combination to see how mine will run, i just need the $$$, whats the prices on the VA and the TTS? and what are they? harness? Tuner? computer swap?

The TTS is a custom ECM tune by Steve Cole www.ttspowersystems.com. I'm running beta tests on it, should be available soon.

The VA is a Van Aaken harness box. I got mine from Mark Craig.

mcrat:

just running over the videos from the dyno day, on the powerpup/dynodominator stack that ct was running(lly), i sat inside with him and watched the outlook monitor, it shows the first run making it to 28psi and the second run getting getting up to 30.6 psi, this was done in forth, but never seen above that, that seams to be like only half throttle on yours, is it the stack difference, are could your numbers be off, not accusing, just asking

i will say he was running a stock trany tho, maybe prevented a bit of load reducing boost

mcrat:

just running over the videos from the dyno day, on the powerpup/dynodominator stack that ct was running(lly), i sat inside with him and watched the outlook monitor, it shows the first run making it to 28psi and the second run getting getting up to 30.6 psi, this was done in forth, but never seen above that, that seams to be like only half throttle on yours, is it the stack difference, are could your numbers be off, not accusing, just asking

I did the test during lunch, now I'm going to "unstack" to go pick up the kids, and when I get home I'll put the stock ECM back in and do it again.

Yes, my gauge could be off. I had a hard time believing the numbers. It is a standard air pressure gauge for compressed air, but it worked on the CMM correctly.

I have also heard of another guy (he can pipe up if he wants) who has stacked an LLY to >40PSI with more conventional gauges.

It is interesting that when I had the Edge/Attitude stacked with the TTS Tow, it buried the Attitude pretty easy as well at 30.

Oh, and if the Outlook Monitor reads the MAP sensor from the motor, I've been told it only goes to 30.x PSI anyways.

no problem, just asking, keep us informed, good info

The va box brings the vvt to life....I can absolutely bury a 30 psi gauge when stacked with the predator.....i wouldn't doubt 40 psi at all.....I need a gauge to go to 50psi to be sure though.

One thing I have noticed. An undampened needle style mechanical pressure gauge is not the best device for the LLY. Needs dampening or electronics.

My lly with the edge will show 30.4 psi @ 2600 on the attiude pulling the loaded trailer.

That's probably as high as the Attitude will read. You might have been actually been higher.

i don't know what the lly will make but i have seen enough boost on the lb7 to inflate a tire i won't say how high or who but it was up there and the head seemed to be fine.

All I know is the EGT's weren not to high 1300 ish and there was plenty of go on tap yet and the GCW was 27400k so that makes me Happy. Now... what trans and what stack, and what amy I going to have do in trade for the wife to make nice, HMMM.

i don't know what the lly will make but i have seen enough boost on the lb7 to inflate a tire i won't say how high or who but it was up there and the head seemed to be fine.

Chamber pressure is what forces the headgasket to blow. You can run 100PSI without hurting anything if you aren't making any power. That's only 1800PSI.

It's when you combine fuel with boost when bad things happen to good headgaskets. ;)

I've seen between 29.4 and 29.6 with the Edge/Attitude and also running the Predator by itself. Has anyone seen higher with the Attitude.

I'm starting to get used to these level 3 setting :)

The Duramax has a 3 bar map sensor. Anyone care to guess how many psi it's limit is?

Hint: 1 bar = 14.7 psi at sea level

I wonder what the allowable mfr'g tolerance is? If it was 5%, it would explain peak readings from 29.x to 30.x.

I don't mean to say that McRat's boost #'s are wrong, but the 6.0 uses the same VVT charger, and I have never heard of anyone claiming over 35+ boost. Although they may not have as much fuel.

The duramax has more displacement, which also leads me to believe that Dmax boost will be lower compared to the 6.0. In general an engine with more displacement will take less boost to make equal power as a smaller engine.

all that rigg'n and fancy guages............. and only 3 ft of hose? .......Pat, what were you thinking? :shake: tis, tis ,tis









Actually, it's funny as hell.:smashfrea :funnypost

McRat I will be bringing you a present home. If I ever get out of here

Top one is from a dead stop on flat ground.
Bottom one is on the freeway and punching it on a grade.<!-- / message --><!-- attachments -->
http://dieselplace.com/forum/attachment.php?attachmentid=2041&stc=1

http://dieselplace.com/forum/attachment.php?attachmentid=2042&stc=1

Pics no worky.

You sure? I see them fine. Anyone else not see them?

No worky for me either. :D

uuumph......me see pictor....

no see for me either:nopics:

sorry for my ignorance... i couldn't help myself:muahaha:

I can see them... 30 and 29.6 psi. Someone said that the attitude can't read more than 30 psi?

It's not the Attitude that causes it, it's the fact that it relies on the factory MAP sensor which bottoms out at 2 atmosheres positive pressure, or about 30PSI.

This is REALLY bizarre. My wife can see it on a XP computer on the cable modem.
I'm running XP on the SAME cable modem and I can't. Both computers are 4 ft apart, one a Compaq, the other an HP.

I have hit 30.4 psi a few times, but it is kinda hard to have the camera ready for when that happens. LOL

I can see it now at home on my computer. Hmmm...that is weird.

some one just has to tap into the boost line with their air compressor and slowly add some pressure, then we know for sure, why would edge only allow it to thirthy

It's not Edge limiting it to thirty. It's the map sensor in the truck which Edge reads. GM has it limited to ~30 with the sensor. I assume this is just because they don't expect it to go higher in "stock" form.

can we replace like some of the GM cars are doing?

i thought i read steve says it is good for 3 atmospheres, 45psi, that is the sstock map sensor

i have seen the attitude monitor read a lot higher than 30.. i have seen it 7X area ... i don't know what you all are talking about.

The Edge Attitude is limited to the sensor from my understanding since it gets that reading from the ECM. I've also read 3 bar for the sensor which is above 30 psi so I don't understand the 30psi limit on the Edge, if it exists. If it is limited to 30psi than either Edge has limited it (which I don't think would be the case) or the sensor is not 3 bar. It would seem correct that it's 2 bar. I don't know as I'm just going by what I've read.

and your kidding who?

It would seem correct that it's 2 bar. I don't know as I'm just going by what I've read.
You need to remember these are Absolute sensors not Gauge sensors! The Absolute pressure at sea level is 14.7 psi, the absolute pressure in outer space is 0. A three bar sensor has a range of 44.1 and if your at sea level it will read 14.7 with the engine off

44.1- 14.7 = 29.4 so the max reading at sea level is 29.4 and there is nothing anyone can do to change it unless of coarse you changed to a 4 bar sensor and recalibrated the entire system.

Got it. I knew I had read 3 bar several times but couldn't for the life of me figure out where the other "1 bar" went. Makes perfect sense and I knew there was a simple answer.

So this would stand to reason that you wouldn't see 7x psi with the Attitude provided it gets it's reading from the ECM, which is must since there is no boost installation with the Attitude. Plug it in and you've got a boost reading which means it's getting it from the truck (ECM in this case).

now would that reading be possible on an X monitor cause i know i have seen that number 7x on a digital monitor

It would be possible on any gauge that had a boost sensor which required you to install it, and the gauge read that high. I'm not familiar with the X monitor so I can't comment on it. The only reason the Edge is limited is because it doesn't have it's own sensor. It reads information from the ECM which is limited by the 3 bar sensor.

so the edge has a downfall, make it hard to have one with a few mods done

All this talk about "bars" is making me thirsty! :D

All this talk about "bars" is making me thirsty! :D
:idea: Come on over Guy!:beerchug: :drinking: :ThrowUp:

I have hit 30.4 psi a few times, but it is kinda hard to have the camera ready for when that happens. LOL
I hit 30.8 psi today.

not that it matters too much but i was doing 70 and rolled on hard with a predator edge stack and my edge went quickly to 28.4 psi around 80 and stopped like it hit a brick wall but im pretty sure the boost kept climbing (but to what????), i really need to get my mechanical gauge hooked up

McRat,

Do you have your EGR blocked?

Matt

Im running a Banks big hoss kit, no cat, apr stage 2 intake, fingers, and have pillar mounted Autometer Nexus gauges, all installed onto a 2005 Duramax 6.6 cc/sb with a 11 inch lift and 38 inch mud tires. The boost gauge reads as high as 30, but the needle can continue past that to what I estimate to be 33-34. It is not unusual for me to peg out the gauge when I run it WFO at level six on the tuner, from both a dead stop or from a running start.