I just did some work on the truck, and it's running pretty strong now. I took it for a test drive and heard knock for the 1st time ever in my truck. I came back home and got the laptop to see what was going on.

The o2's are saying ~.900 at WOT, up to 5600 rpms in 2nd where the MAF flatlines at 60.01 lbs/min. Progressivly, up to 6500, it gets leaner, all the way down to ~.870's.

WHat I need to know is how to get around a maxxed out MAF. I'm not against going SD, but I don't really want to invest the time into it right now and would rather wait until CarPuting catches a clue and fixes it so I can tune in the truck instead of having to pop the hood. If there's another way around it, let's hear it.

Parish, what are you doing to get around it?

I need to figure this out because I still have a couple pounds of boost to add.

 

I think you need to go to PE vs RPM add pe at the rpm maf goes flat till it gets to where you want it.

 

The only thing this won't account for is changes in weather so tune it a little rich in the hot weather if it's going to get cool out anytime soon.

 

Is there an alternative. It seems like I remember something about scaling the MAF table up by a 3rd and the IFR table by another 3rd and something else. It would 'trick' the PCM into thinking there was less air coming into the engine than it actuall was, but since all the tables are adjusted equally, then it will all compensate out and be even.

Does anyone remember any of that ?

 

i have tried several things and nothing really works well other than the pe table and like john said it does not take weather into acount.

the rule is 3% per cell. if you max the maf at 5000 rpm and your fueling is good up to that point then you need to add 3% for every rpm cell from that point up. thats 3% more for every step. let me go get a screen shot of my pe and you will see where i am at. i am working on a way around this and think i have a killer solution but it wont be super cheap or easy. it will kick *** though.

 

No way am i telling you anything! You're starting to make real power and it's scaring me!

Actually I don't know. Rick was explaining it to me once when i asked him how he got around the maxed MAF thing but I thought he said he added tables/cells or something to that effect. I'm sure he'd tell you if you PM'd him. His screen name here is Rick@Synergy.

I hate not doing my own tuning anymore because I feel so out of the loop on new stuff, but I'll be damned if I'm gonna try tuning my truck nowadays. It's to expensive to experiment with. LOL

 

i max my maf at 4000rpm sometimes so that is when i start adding fuel. 3% per cell all the way to the top.

 

So .. what your saying is add 3% at 4k, 6% at 4400, 9% at 4900 and so on?

F8L, don't be scared, I still have wussy tires. No matter how hot I get them, the ET Streets just don't hook.

 

i added 3% at 4k, then 3% more than the 4k for 4400, then 3% more than 4400 for 4800.

 

I have seen where some people get good results with PE, others with IFR. Most are saying to go SD tho. I am having same issue on my bro motor, gonna try the PE first as the IFR and SD seem to be tricky and dangerous at first.