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Johnny's GoatBuilt JHF buggy build

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Discussion starter · #842 · (Edited)
I had picked up this TYT TH-8600 a bit ago, and finally got around to installing it. I wanted the antenna tucked away from destructive objects, and since I don't need max transmission I put it in a dead space.

I wasn't sure if I'd like the radio location, so I made a mount that I could hose clamp to the cage. My sense is that it will stay there forever, but whatever. Apparently now I need a mag mount for the handset to be one of the cool kids.

Not sure I care, but it's not supported by Chirp. The app they sent with it worked fine for copying the frequency list that I have from my handheld.

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#846 ·
You do need to have the IAC calibrated. The computer expects a certain orifice size in its flow calculations for "steps" so if it's not in the right spot it will have a difficult time "hunting".

You can take some timing out under 1200rpm and that should solve the "throttle granularity" issue. Often people struggle with the dexterity at low speeds because timing is picking up and right after that the torque converter clutch locks up.
 
#848 ·
wrath said:
You do need to have the IAC calibrated. The computer expects a certain orifice size in its flow calculations for "steps" so if it's not in the right spot it will have a difficult time "hunting".

You can take some timing out under 1200rpm and that should solve the "throttle granularity" issue. Often people struggle with the dexterity at low speeds because timing is picking up and right after that the torque converter clutch locks up.
Click to expand...
Another thing to add is what does the RPM/MAP resolution look like? If you have the RPM bins on your VE, AFR, and timing tables set far apart, the resolution is horrible and will not change fast. I always set mine close together from idle to cruise.
 
Discussion starter · #852 ·
Hooked up the craptop tonight and grabbed some data. I did the IAC tune procedure. I'll be interested to see how it idles and plays off idle.

I pulled the stock spark table. I haven't messed with this at all. The fuel learn map is below that. I have never "transfer learning to base" so I would expect that this what it has corrected for since getting it running a year ago.

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I'm shocked it learned above 6000rpm. I know I've tapped the rev limiter a few times. I looked up the stock limiter and they claim it's 6000rpm, so I dropped the limiter back to that since the engine is all stock internals.
 
#855 ·
Here are my fuel and timing tables. I run megasquirt so I do not have as big of a table as Holley offers :( I have my RPM break points below idle, around idle, and off idle. This allows for great control with timing and fuel. Really I could start it at 900 and be ok. I then have the RPM points close for where I spend most of the time in steady state cruising.

I can run 87 octane and be detonation free. I'm sure I could add timing in areas, which I may play with in time to get more power....but what I have works.

I still need to go through the VE table and smooth the cells so they are gradually increasing. Not rise and fall and rise again. I dial back my O2 correction % and make changes.
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#856 · (Edited)
You have definitely been in "holley take the wheel" mode haha. It's a great system honestly. What is the engine combo exactly? Do the IAC learn/calibrate or whatever it's called. Call it a hunch but I'm willing to bet 12 deg at idle is not high enough. You should get the engine up to temp, then move idle timing up 1 degree at a time. You'll be able to see the Map value shrink, then grow again. You want your idle timing set where the map value is the lowest(pulling the most vacuum). Then you want to know what map/rpm area you move to when coming off idle in the situation you mentioned. Make sure you don't have a big timing jump between idle and that specific area. When you get more into it you can look at using your inputs to create a custom table that subracts timing from the table above idle and you can flip that switch in that instance, cutting power down, keeping you from getting too much momentum out west. The system is very flexible with the user inputs so there are alot of things you can to for situational things.

Stock idle on a 6.0 is 16, my 6.0 is set to idle at 20 for reference. My chevelle is at 23 I believe.
 
#860 ·
I so...want to turbo my jeep. I have all the parts....its so hard to restrain myself! alksdjf;lashdf;khas;kdjfhal;ksdhfash;DFJ;ASDFAS;DF

I use to aim for 14.7....then realized with todays fuels that is far to lean. Dropped it down to 14.1 and it made a huge difference with drivability. Something to look at.

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Amazing what you can do with these computer systems. Either keep it easy or go full retard and have it control everything.
 
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JohnnyJ
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