Help with the truck that no one can tune

[bluessmax]

Thanks for the reply Tony... your a stand up fella. Im curious for my own sake the voltages during this condition...and the time it takes. In this manner, we could at least have accurate data on how and when the fault is occurring. Diagnosing this will be necessary with a techII I'm afraid as well to run the necessary pids simutaniously. If we could find what is causing the issue from a voltage standpoint, we could possibly build a module to "fool" the signal such as done with lockup controllers to keep from certain codes happening (Ben, that is your dept brotha!)....

I'm only stating this can be fixed one way or the other. I'm quite confident it can not be done with Tuning via Efilive with given tables...I say this because I have no doubt in Tony and Robs abilities.

Good luck again guys, this could turn out to be a very interesting thread.

 

[GMC_2002_Dmax]

I have a backlog of ecm's and tune files to get done........someone else can take the reigns on this one for a while, maybe a fresh look by another tuner will get somewhere.

If I owned the truck and had it to play with for a while it might get fixed, but when you have to fill anywhere from 20-30 tune/ecm orders a week as well as trying to accommodate retuning for existing customer during pulling/race season (tuning is a hobby business) and I also own/run another company which takes a lot of my time, it leaves me little time to spend with my wife/kids as it is.

IMHO, it will require more than just VVT voltage logs, the 60% sticks and the second charger all contribute to the lag, if you don't fuel it hard enough you won't make boost, fuel it properly for boost under normal conditions and it will not lag bad but this truck lags and blows smoke because the charger is slow to lite due to whatever ?

I have tuned a bunch of fixed vane LB7/big twins and many guys on here have them and without bragging if you asked them how they spool it's pretty dam good.

I have no problems at all with fixed vane LB7/LLY twinned trucks, they are easy to tune, LBZ's also are no problem.........although I don't tune many fixed vane/twinned LBZ's.

Just need to take a step back, the last month hasn't been fun with the two trucks.

 

[Dan@PPE]

MPLV,

Give me a call in the am, I have a few idea's.:thumb:

 

[Hot COCOAL]

Is it possible the heads got over ported, or the cam is too big too early on the lsa? Do you have stock heads you could make work to see what it does with some back pressure in the equation? What kinds of drive pressures do you have right now?

 

[GMC_2002_Dmax]

Thanks for the reply Tony... your a stand up fella. Im curious for my own sake the voltages during this condition...and the time it takes. In this manner, we could at least have accurate data on how and when the fault is occurring. Diagnosing this will be necessary with a techII I'm afraid as well to run the necessary pids simutaniously. If we could find what is causing the issue from a voltage standpoint, we could possibly build a module to "fool" the signal such as done with lockup controllers to keep from certain codes happening (Ben, that is your dept brotha!)....

I'm only stating this can be fixed one way or the other. I'm quite confident it can not be done with Tuning via Efilive with given tables...I say this because I have no doubt in Tony and Robs abilities.

Good luck again guys, this could turn out to be a very interesting thread.

In the LB7/LLY stock tune files there is tables C0801,802,803,804,805,806

To my knowledge the LMM's tables do not give you the window that boost can differ either higher or lower in these OS's, if there were such a similar table then under boost might be eliminated.

MPLV,

Give me a call in the am, I have a few idea's.:thumb:

Hope you have lots of free time and aspirin.......:roflmao:

Is it possible the heads got over ported, or the cam is too big too early on the lsa? Do you have stock heads you could make work to see what it does with some back pressure in the equation? What kinds of drive pressures do you have right now?

Anything is possible.......I am not going to second guess the parts selection for the build.......

 

[Hot COCOAL]

No, second guessing parts is counter productive fer sure, but how much can you do before a physical change needs to made? Adding a turbo, or going even bigger on the big charger, or setting a set of stock(as possible) heads on the block and see what happens...seems to be where this is heading...the way beyond reason realm.

 

[GMC_2002_Dmax]

No, second guessing parts is counter productive fer sure, but how much can you do before a physical change needs to made? Adding a turbo, or going even bigger on the big charger, or setting a set of stock(as possible) heads on the block and see what happens...seems to be where this is heading...the way beyond reason realm.

All I can say is in 1985 I owned/drove a 1969/L78/SS396 Chevelle with the rectangular port 375HP motor and it had solid lifters, big factory cam and Holly on it all factory.

A stock 396/350HP oval port head motor would kill it off the line........but not once those bigger heads and cam started working.........:woott:

Sound familiar ???? See any similarities ????

I don't know what cam and what lift/duration was selected, I do know I have tuned a lot of trucks with larger cams and Socal Stage 2 heads and never had a problem, I know the builder well and he is meticulous and quadruple checked everything including boost leaks.

If you saw the truck its not a half ass throw together POS, no expense was spared to make it right.

 

[mplv]

The truck ran like it had a bolt of lightning stuffed up its ass without the built motor, heads, cam, cheeta, and billet wheel in the 88, so putting the stock charger back up top is a no brainer to me at this point. It would have been a no brainer to me 6 weeks ago if the situation had been discussed in depth but I think information was still being gathered until 2 weeks or so ago.

Rob wants to send me some tunes when he gets back from vacation next week but I spoke with someone who tried several of them and still has the issues. He didnt sound as excited about me shipping the truck to idaho as I was but I am still willing.

If something revolutionary happens from a tuning standpoint the cheeta will be sitting at my office and maybe it will get put back on, but to think its worth swapping the heads off or whatever other nonsense is absurd because the cheeta is the issue. Will it fit an LML? I have 3 of them, how about 03-05 4500s?

 

[mplv]

pics

 

[duratothemax]

when you have to fill anywhere from 20-30 tune/ecm orders a week as well as trying to accommodate retuning for existing customer during pulling/race season (tuning is a hobby business) and I also own/run another company which takes a lot of my time, it leaves me little time to spend with my wife/kids as it is..

Jeez 20-30 ECM orders per week (doing the rough math on what $ that equates to), I wouldnt even bother with/need to have a second job!

 

[duratothemax]

if someone can get me a lot more details about the problem, when it occurs, voltages, etc, I will look into making something.

But its going to be difficult without the truck in front of me.

Has anyone tried temporarily disconnecting the vane position sensor and then go do a WOT run then? Im talking about the SENSOR, (plug under the radiator water neck), not the solenoid/actuator.

 

[GMC_2002_Dmax]

Jeez 20-30 ECM orders per week (doing the rough math on what $ that equates to), I wouldnt even bother with/need to have a second job!

Ben you have to remember I have been at this longer than almost any other tuner including Rob.

I have a large network of shops a lot of repeat business and a lot of referrals that's why I don't have to advertise on other sites and have my cheerleaders post in every thread when someone asks about EFI live tuning.

My other business is run the same way all referrals

 

[Chevy1925]

has swapping ECMs been tried or thought of? or would it not matter?

 

[duratothemax]

Ben you have to remember I have been at this longer than almost any other tuner including Rob.

we were all efilive beta testers tony, we all started at the same time.

You, me, bobo, kennedy, and rob....I forget who else.

My efilive V1 register date is december 2nd, 2005.

 

[GMC_2002_Dmax]

has swapping ECMs been tried or thought of? or would it not matter?

Yes

 

[Chevy1925]

Yes

k :angel:

 

[mplv]

PPE wants to sell me a boost controller and a tuner box that are non returnable items on the thought that it "should" work based on what they heard and think, The reference they provided me point blank said it was no better than the mess I have with robs tuning. Then they said the truck "should" be able to be flashed with their software and then tuned with EFI on top of the PPE tune.

I would gladly buy them if they were returnable but they arent so in my eyes they arent confident in the product.

 

[mplv]

What about swapping ECM and BCM out of a junkyard truck with the same hard options as my truck but a different OS?

no sunroof
no rear slider
no back up sensors
no stabilitrak
no reverse camera
no nav

 

[SSchmi5519]

It does this on the stock tune then too im assuming?

 

[JustinD]

PPE wants to sell me a boost controller and a tuner box that are non returnable items on the thought that it "should" work based on what they heard and think, The reference they provided me point blank said it was no better than the mess I have with robs tuning. Then they said the truck "should" be able to be flashed with their software and then tuned with EFI on top of the PPE tune.

I would gladly buy them if they were returnable but they arent so in my eyes they arent confident in the product.

:roflmao: Try these.....but if they don't help we don't want them back.....yeah no thanks.