5.7stroker

iTrader: (36)

Ya the reason why I’m mentioning the poor gas mileage is because it’s something like 8 mpg. I only drive the car for a few hours on the weekend when it’s nice, but figured at only 8 mpg something is wrong.

ChopperDoc

Yes that is extremely low for a heads/cam car. I would be looking into that tune. What do the plugs look like? That is something else I'd take a look at to confirm. Sounds like it's pig rich everywhere on the VE table, that or your PE mode is active at like 10% throttle and 1500 RPM or something. Could be a mechanical issue too. Hard to say, but most likely the tune.

ChopperDoc

With mileage that bad you're making ME feel better about my 427 stroker LS3 with 14 MPG. I thought THAT was bad lol.

LQ4-E39

iTrader: (7)

Thanks a ton for putting this together. Much appreciated!

Corey Hunt

Thanks for making these videos. I've never tuned anything before and using these videos I've been able to get my car driveable!

cam

iTrader: (9)

Solid and certainly handy for many. Thanks for sharing

AndyTA

Just referred to this post again to help me with my tune. (Bump) - Surprised this isn't sticky'd yet....

Lsxford

iTrader: (6)

This is sweet man, you have a new sub! You explain things so well.

Also thank you for your service

ddnspider

iTrader: (26)

Thanks for the reference. I too believe what I've done is taking much of what I learned from others and adding my own spin. Greg's info has been invaluable. Marcin had some excellent stuff. Also shout out to joecar whose was also instrumental in helping me understand various topics. Keep up the good work ChopperDoc!

baSICK5.0

iTrader: (3)

These are massively helpful to someone like me who is just starting out with tuning. Thank you SO much.




I am building a 4.8 Cutlass with a Turbo so I will need all the help I can get. My plan is to start with a stock 4.8 tune from the repository, I already downloaded several. Add injector data, add 15% and go from there. I plan to just run SD so shouldnt I just copy the High Octane table to the low octane table and just add it there? I'm such a newb but I know I can get it with time.

ChopperDoc

For timing, I believe the OS upgrades grant access to both of the tables, however with boost you have to be careful how much timing you are using. A rule I use for boost area is the 28 rule, as widely accepted among members here and seems to be pretty successful. The rule is start with the number 28, subtract the boost at that spot and that is your spark value. So if you have 10 PSI, use 18 degrees as a value. It's ballpark, but shouldn't get you into too much trouble under boost.

If you don't run the OS upgrades, then yes the HO and LO tables need to match. As a general rule, pulling about 5 degrees out across the board isn't going to hurt you either, just as a general starting point.

For fueling, 15% is for standard tunes involving cam or other airflow changes where you have made significant gains over stock, not counting boost. Boost starts at about 105 kPa on a normal day, as in you are beginning to exceed atmospheric pressure which is typically 102, but changes day to day obviously. Above that is "boost" since you now have more air in there than possible with just atmosphere (NA).

So yes, add the 15% across the board, and if possible, tune without boost hooked up to get the NA numbers on point. Then go ahead and take the last row from the "NA" area (105 row) and copy it to the LAST row in your table. If you are using a 2 bar, multiply this last row by 150%, then select the entire area from 105 to 210 and select "interpolate between vertical bounds." If you are using a 3 bar, then the last row will be 315, and you should use 200%, and do the same thing.

It will probably run pig rich at first, but that's fine. You won't blow it up by getting rich under boost, it will just lose some power, and get **** mileage. Then simply tune it with the same method shown in the video using error % as a correction from commanded. Commanded is up to you, but under boost you should shoot for somewhere around 11.5 AFR under boost. You can make it a little leaner for more power, but this is something that should be done on a dyno, and should not be pushed too lean for safety purposes.

ChopperDoc

New video posted: Idle tuning.

mOtOrHeAd MiKe

iTrader: (8)

Good on ya! I am behind anything open source. Too much cryptic minimalist jumbled info offered out there on these subjects.

mcdonald77

iTrader: (21)

Ive been working on idle tuning using your vids. You have been the most helpful so far. I have books and DVD's but I am a simple, visual learner. My car is driving and idling well!

ChopperDoc

This is really awesome to hear. This is why I started doing these in the first place, to help people out. I intend to continue as time and work permit. I recognized a lack of good tuning videos out there, and I know it's tough to watch a few of the other guys out there ramble on for 40 minutes and not cover everything you might need to know. I had trouble learning too trying to find decent videos and other walkthroughs that made sense for a beginner.

Years later, here I am passing on experience and tons of research and forums I know most just haven't invested into enough time into to learn. Now I can spot where many guides are lacking, and I try and cover everything I can think of that would be helpful to know from a beginner standpoint. So far so good I'd say. I really appreciate the feedback and it keeps me motivated to make more. And yeah, they take tons of time to put together because I tend to do a lot of takes until I'm satisfied with the result.

I'll probably do a MAF tuning video next and show some tricks there to get it dialed in faster. Other things I'll probably do in the near future are things like transmission tuning, scanner tricks, useful custom PID's, spark tuning, and so on. I don't want to make too many promises, but those ideas are floating around in my head lol. I might even do some Ford stuff... I know... Blasphemy here on this forum, but hey, it'll probably help someone lol.

ddnspider

iTrader: (26)

feel free to use or reference either my maf scaling or keeping the 4l60e alive under higher hp stickies.

cam

iTrader: (9)

Indeed Chopper Doc well done!

For guys like me who tune a handful of times per year its been hard to even grasp the software updates and the differences from vehicle to vehicle with acronyms and tables. Your contributions are very helpful

SE-R Spec

iTrader: (2)

Sub’d On the tubes

Mystery Bird

iTrader: (7)

I've been reading till my eyes bleed for years and have figured out quite a bit, but the way you teach is by far the easiest to learn for me. I feel pretty confident in tuning but have still learned some from your videos. Thanks for the videos. Yes I subscribed.

AndyTA

EDIT:

IGNORE. Literally just saw that on the video... LOL.

Hey ChopperDoc,

Would you say that tuning the IAC would come before Idle tuning, or vis versa?

Thanks,
Andy