Dyno Tuning: How to, tips, or tricks? semi-experienced

[christianreid22]

So after being on the dyno… I was able to get my ‘20 6.4 charger to gain 30 whp and wtq on e85. Commanding 23-27* of spark during wot. I initially had extreme trouble dialing in the fueling playing with Neural Network. So at the moment.. my power enrichment table looks god aweful. Some cells have PE at .0050 and the very next cell is .0120.. I took it off the dyno still a little rich.

What is the safe Max power Lambda value for PE on e85? That is what I struggled with the most. Going back in 01/28/23 just to dial in fuel.

So I do have some follow up questions:

What is max power stoich for E85 that is safe?

Should I start commanding 27* spark during WOT earlier? Or is a ramp up from 22* that phases out to 27* more ideal?

[rays04gtx]

I'm not a Fan of any E-85 for a NA application, too many variables in the Quality and % of E85 nation wide, anything as high as 53% to 83% qualifies as E85. what works at sea level will be dam a$$ fat at5000 elevation.....what's Goldie loch in Denver will burn up a good running stock SBE hemi here at sea level.

but that's not your question......depending on who you talk to .70-72 Lambda is Max rich for E85 and .84-86 is max Lean Lambda for E-85.

So in Dodge PE table .71(7 to 1 E85AFR) =.140-.145 . .86(8.48 to 1) is .115-.117

again same deal add fuel till it doesn't like it, take fuel away till the knock sensors scream ......

what you can do is make the Knock sensors 10% more sensitive pull fuel till they "flicker" add back 1-5% and log your daily drive ,
Remember depending on where you are in this great big country what the vehicle likes in December/January , is not going to play well in June-August.

As for Commanding WOT, I'll get back to this.....Grandkids are here and chasing the dog around the house.


Turn NN off till you can get a good grasp of how it works.

Contact user White1 he plays with E85 .

[christianreid22]

You are not the first to tell me to turn off NN on e85… if I’m being honest… I’m scared to lose some driveability disabling NN. But, I am extremely familiar with VE tuning on these cars.

If I disable NN.. do I need to play with a spark tables? Or is NN simply the AI that controls strictly fueling based on variety of data points?? I know to disable NN and tune VE once the cam is changed… but how would that favor is staying with stock cam??

On 1/28/22 I am taking it back to the dyno to square some things away… maybe I should use this time to tune VE on the streets everyday to and from work???

[mbray01]

One point to make on these hemi's is that they have incredibly narrow tuning windows. Meaning, the dyno may tell you it wants 25*, however at the track it may only want 22*. And you will also find the difference in load has caused the engine to actually be detonating at the dyno number. If you are using a load bearing dyno make sure you are utilizing it, and watch what the load does to what the engine wants. I have personally seen scat packs want 24* on the dyno unlocked, then want 16* all in under load. Properly utilizing the dyno is 90% of the process. Just being strapped down will only go so far

[christianreid22]

Thank you all for your input.

I was able to pick up 30whp and 30wtq above stock baseline utilizing all your suggestions here. @Wot commanding 22* around 3200 rpm and phasing out to 27* at 6400 rpm is what made the best power.


I’ll update this thread as I make changes or need help further on the dyno.

[LilSick]

When I raise my timing to those numbers ^^^ for E how do I get that extra timing (lets just say on the dyno it liked it when I added 10 deg in each of the 2 or 3 bottom cells from 3200 to 6700) how do I get that extra 10 deg BACK OUT for WOT shifts?????

*I know it will make more power with E and approximately 25 deg but how is it going to shift and how long will my oem clutch packs last??? $5600 for a billet E drum red clutches with a added fiber here n there is not on the table right now. Is there a way in TM to pull it back far enough and ramp it right back after each shift is complete???