Little rant, some info from logging...

GeneralTJI

Turbo Todd
Jun 1, 2010
1,272
0
36
Colorado
Ok.... so I am an HP Tuners guy because I've had it for years tuning LS based stuff etc. Naturally I stuck with it for my truck because for $100 I was up and running. Tuning wise it works fine, outside of not having a dsp switch, it's basically the same as EFI. Logging wise.... terrible.

Last night was the FIRST time I have ever been able to log my truck. I have posted on the forum before about getting it working.. nothing. Posted again and some guy had created his own custom scanner config file that allowd me to log all of 3 things. He was kind enough to send it to me. RPM, MAF and mph :mad: Nothing else works... and that's where he gave up.

Thankfully rpm and maf was what I was looking for because I am trying to do some real fine tuning of vane positions and squeak as much flow out of my turbo as I can without unnecessary drive pressure.

What I found was interesting...with my current vane posi and tune I am actually seeing peak MAF numbers at 3500rpms... and it's only dropping slightly up to 3800. I had my truck shifting at 3350, but I'm going to bump it up which should be slightly easier on the trans, and in theory I should get a touch more hp with the higher flow assuming my timing is dialed in correct etc.

I have tried a lot of things with vane positioning to get more boost out of my truck and it just won't do it in the higher rpms. I closed them down pretty tight and it made slightly more boost but felt slower, my guess is that drive pressure was through the roof and the motor was choked up so bad power actually went down. Boost being just a measure of resistance tells me I actually created more by inhibiting flow through the exhaust... if my worthless ass scanner would have been working at that time I'm confident my MAF would have agree that overall flow had gone down. Tried them opened way up, boost drops a little and smoke gets pretty bad :( 7000ft altitude can really suck at times.

Anyway, It's obvious EFI has the market and HP knows this. People post about new feature such as support for the LML.. HP's answer is: "not for a long time if ever, it's going to be kinda hard and actually require work to crack the computer" .... how about a dsp switch type setup? "uhhh... thats not possible right now and won't ever be most likely" .. why? because they don't have enough diesel customers to make it worth their time. Those of us who did buy their product are just SOL.

My truck runs good considering I tuned it blind folded :mad: .. just think about what other fine tuning could be done if I was able to log anything else :rolleyes:

|Done complaining|
 

GeneralTJI

Turbo Todd
Jun 1, 2010
1,272
0
36
Colorado
I'd love too, but I can't see spending the money now. I'd just like to have all the features they claim- to actually work :rolleyes:

I am kinda excited to be seeing max flow numbers at a pretty high rpm though :thumb: I wish it would hold more boost up top (not cleaning up), but obviously it's moving enough air to maintain power.
 

TrentNell

Finally underway !!!!!
Jul 7, 2008
7,543
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slc tuah
I never had any issue's logging with HP , in fact I loved how I could log the engine and trans at the same time. EFI has better over all logging but i found HP to be sufficient. If I had my old HP stuff I would post up one of the ones I used to use.
 

x MadMAX DIESEL

<<<< No Horsepower
Dec 30, 2008
7,535
2
38
34
Lexington, Ky
I never had any issue's logging with HP , in fact I loved how I could log the engine and trans at the same time. EFI has better over all logging but i found HP to be sufficient. If I had my old HP stuff I would post up one of the ones I used to use.

BBL can log ECM and TCM
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,748
821
113
Texas!!!
What you really need to look at is air per cylinder. I can divide lbs/min by revolutions/min to get lbs/revolution. I can then divide that by 4 (since there are 4 intake strokes per revolution) to get lbs of air per cylinder. Here is an example I took from one of my own logs:

At 2802 RPM, I am flowing 62.44 lbs/min. I divide it out to get .00557 lbs/cylinder.

At 3214 RPM, I am flowing 68.08 lbs/min. I divide that out to get .00530 lbs/cylinder.

So even though the total airflow is more, there are more intake strokes to eat that air, making it less air per intake stroke.
 

GeneralTJI

Turbo Todd
Jun 1, 2010
1,272
0
36
Colorado
Trent the issue only exists on the LBZ and I *think* LMM's.... the older trucks seem to log ok but some other LBZ guys are having trouble too.

Wouldnt overall higher airflow mean more power potential (in theory)? Assuming proper timing, fuelung etc.?

I see what your saying about the air per cylinder going down and thats why the torque curve would be going down as well.. but hp should still be maintaining or climbing depending on overall flow correct?
 
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GeneralTJI

Turbo Todd
Jun 1, 2010
1,272
0
36
Colorado
Ok.. I would still love to discuss the overall flow, hp capability stuff we started talking about... but as far as logging.. case closed!

I complained again on the board.. this time they gave me the super secret link to the latest beta. The beta I was running was from 6 months ago, they released a newer beta about 2 months back that fixed some of these issues (but they don't make this real well known).

Anyway, open mouth insert foot :eek: :rofl:

I now have access to lots of paremeters!! :thumb: :)
 

turbhoe

researching lbz swap
Jan 8, 2011
141
0
0
jacksonville florida
for a while there, if you were on the beta list you would get the latest beta every time it came out. but here lately you have to ask for the latest. one beta came out and you couldn't load any tunes at all. that was frustrating. but i just went to a older beta and was fine until the fix came out.

i'm going to start messing around with some tune and log stuff for duramax. if you have any log configs you wouldn't mind sharing it would be great.