LBZ race tune

[sweetdiesel]

Josh I drove in Dales truck today....I liked the tune,Shifted good to me and cleans up nicely

It is a lil hot but thats what race tunes with stock turbos are all about

 

[JD4440]

table GM.boost2_dma was 14.8/18.7/48.1 respectively. desired boost was max 340 kpa, not sure what that converts to. That's kind of what I was thinking adjust the parameters. Seems like when I ran PPE that boost was this high and never had this code?? Do I not need the boost to keep things cool?

 

[sweetdiesel]

table GM.boost2_dma was 14.8/18.7/48.1 respectively. desired boost was max 340 kpa, not sure what that converts to. That's kind of what I was thinking adjust the parameters. Seems like when I ran PPE that boost was this high and never had this code?? Do I not need the boost to keep things cool?

340kpa / 6.895 ( or 7 is close enough ) 48 psi
take 48 psi and subract baro = actual boost

In your tune there is a convert tab that you can use to convert all sorts of stuff

Josh or anyone for that matter can change your tune so it wont code from high boost or drop the boost....2 options for you

 

[JoshH]

You can actually raise the voltage and/or time parameters for that code so MAP pressure can go higher without coding, or the code can be shut off completely, or the boost can be lowered. It's really up to you what option you choose. The boost is a little on the high side for the stock turbo, but the way I came up with those boost tables was to go to the high altitude boost tables and use a multiplier so the numbers in the upper left corner corner were 12 and 14.5 for the medium and low altitude boost tables respectively. The reason I did this was because since turbos work off pressure ratios rather than overall boost numbers, I figured it would be safe to use the pressure ratios that GM uses. The high altitude boost tables have very high pressure ratios compared to the stock boost tables for medium and low altitude. You can find out what the pressure ratio is by dividing total boost, which is the numbers in the boost tables, by the pressure in front of the turbo, which for all practical purposes is barometric pressure and is found in the upper left corner of the boost tables for the table you are checking.

I hope that what I wrote was somewhat understandable. Let me know what you want to do about that code, and I'll either fix it or tell you how to so you can fix it.

 

[JD4440]

Whatever you thing is best overall. Like said I've ran that high before w/ no code. I think mid 30's like 32-33 is about the end of efficiency for my stock charger. Guess we could lower max boost to 33 and if it still coded maybe shut the light off if that's not a totally terrible idea. it's only a temporary condition so I don't see the harm in it.

 

[JoshH]

Done. Max PW I saw was 2900. Max boost was about 29psi. It shifts pretty good for a shitty transmission. The tune itself runs good but smokes blue at idle. If it was a little less hot and I had a better trans I would consider it for a DD. Definetly not a tow tune though!!

Those logs are great, Dale. Thanks. Looks like the tune is running pretty good on your truck. Running an average pulse of almost 3000 in 4th gear with an average rail pressure of almost 26k and an average boost pressure of about 30 PSI and vane position at 25% once they get settled. The shifts look like they're happening in a decent amount of time without too much defuel. If you want, I can add a little timing to try to keep the EGTs down. Since I had originally written this tune for twins, the timing is pretty conservative. I could raise it some without getting too crazy with it. Let me know.

Whatever you thing is best overall. Like said I've ran that high before w/ no code. I think mid 30's like 32-33 is about the end of efficiency for my stock charger. Guess we could lower max boost to 33 and if it still coded maybe shut the light off if that's not a totally terrible idea. it's only a temporary condition so I don't see the harm in it.

I have attached a new version of the tune. I set it so the max commanded boost should never go over 32 PSI. I'm not sure at what boost pressure the P0108 code is set, but I raised the time limit to 120 seconds which would still allow it to code if you have a wiring or sensor problem but not during a WOT run unless you hold it there for 2 minutes straight. Hopefully that fixes it for you.

 

[sweetdiesel]

Those logs are great, Dale. Thanks. Looks like the tune is running pretty good on your truck. Running an average pulse of almost 3000 in 4th gear with an average rail pressure of almost 26k and an average boost pressure of about 30 PSI and vane position at 25% once they get settled. The shifts look like they're happening in a decent amount of time without too much defuel. If you want, I can add a little timing to try to keep the EGTs down. Since I had originally written this tune for twins, the timing is pretty conservative. I could raise it some without getting too crazy with it. Let me know.


.

I say raise it after 2600rpm:happy2:

 

[LBZ]

I raised it .5* from 2100rpm on in the 90mm3 and up cells. Gonna go a another .5.

 

[JD4440]

Thank You Josh.

 

[JoshH]

I raised it .5* from 2100rpm on in the 90mm3 and up cells. Gonna go a another .5.

You can really raise it alot more than that. I made some changes to the timing and attached it to this post.

Thank You Josh.

You're welcome.

 

[LBZ]

I got a code Josh. When I walk on it in 4th or 5th without it downshifting, it gives a P0108 MAP Sensor Circuit High.

 

[JoshH]

What kind of boost were you seeing? Were you running the tune from the post above yours?

 

[LBZ]

Nope the previous one. I never noticed pressure but I would say under 30psi for sure. I could could probably go and make it do it again and log it.



Give me 20 min.

 

[JoshH]

I'm not sure what causes that code, but either version 0002 or 0003 should fix that code. 0003 has added timing that should help keep your EGTs in check a little better. Also, your previous logs show boost in 5th gear to be above 30 the whole time and as high as 34.

 

[LBZ]

Well it did it the first try and according to the log it supposedly hit 46psi!! I doubt it though as the highest I saw was 32psi on my Labonte controller and the mech boost gauge. I couldn't get it to happen again after, but here is the log anyhow.

 

[JoshH]

Well it did it the first try and according to the log it supposedly hit 46psi!! I doubt it though as the highest I saw was 32psi on my Labonte controller and the mech boost gauge. I couldn't get it to happen again after, but here is the log anyhow.

46.8 psi total minus 13.8 barometric pressure is 33 psi. Looks like the log was right in line with what your gauge and w/m controller were seeing. If you get the code again, try one of the other two tunes and that should fix it.

edit: I don't know why I missed where you said it did code the first time, but anyway, either of the other two versions should fix the code problem.

 

[LBZ]

Right baro. God I'm dumb sometimes. Need more booze-brain hurting.....

 

[JoshH]

I have those moments from time to time

 

[JD4440]

I'm running version 2 . Havent had it on the interstate yet but all is good so far Josh.

 

[LBZ]

It's not a bad all around tune. I daily drive it right now!! Little smokey though till it spools, but that's what a race tune does right!