Werd...

 

That is my reading and experience in several days of on-and-off tuning. The car ran better before I installed the wideband (e.g. smart fuel map zero'ed out) than it does with the map enabled. The wideband shows a leaner result in the RPM range that is giving me problems with the smart fuel map on.

The document suggests adjusting the base fuel map, but I believe that all you are doing is centering the operating point within the authority range for a given RPM as defined by the smart fuel map. To actually adjust the operating point one has to slide the smart map up or down as needed.

Shiv please help us in our understanding of this before we (I) do something stupid.

 

Just start messing with it yourself. I redid the smart map to better fit my liking and control any deviations better on my particular car. I did not like how lean it ran in the midrange, nor the extra fuel up top, so I took care of it myself (I also didn't like the timing pull, so I disabled that part as well and just tuned the car until the knock buffer logs were free of any spikes). Now the car runs the AFRs I want, pulls no timing through SMART (yet still adds it) and feels the strongest it has yet

 

Since my map is already pushing the boost solenoid at 100%, what is necessary to get the system up to 23-24 PSI when i'm running race gas? i've seen the passive emulator thingy on vishnu's site, but didnt get one with my kit. i have also seen 'bleeders' mentioned before. So what do i need and where do i get it?

Also, there are a few places around here i can get 100 octane unleaded at the pump. is this considered 'race gas'? what boost/afr levels are safe for 100 octane unleaded?

 

I'm still trying to get an answer from Vishnu on the SMART fuel map (either one) running up to 11.8x AFR in the 4000-5000 RPM range. For example get into 3rd gear with the RPMs below this range and go to WOT. The result is significant knock events with SMART timing stepping in, thus massive variations in engine output.

I know that the base fuel map will generate 10.9-11.1 AFR in this range with SMART fuel off. I'm no expert but this AFR seems to be more in line with what I would expect.

Perhaps I wasn't clear in my prior postings. What is the proper means of correcting this problem?

I have been trying to get someone at Vishnu on the phone now for two days. Hint hint.

 

My thoughts would be to shift the "happy region" to the left, in effect richening the target mixture at lower RPMs.

- Steve

 

You aren't going to be able to tune the condition "lagging motor in 3rd gear".

That is why Mitsu made it pig rich from the factory.....to protect against laggy drivers.

You need to rock the EVO in the correct gear .....don't go doing a pull at 2k in third gear when its tuned to be at 4k in second.

 

I don't think you understant what he's saying. From my interpretation, if he goes WOT at less than 4k RPMs, say 3250, once the motor hits the 4000-5000 range it's lean and he gets knock. When he adds fuel to the base map in this range, he's fighting the SMART map and it leans it back out. The solution would then be to shift the SMART map to be richer in this RPM range to eliminate the lean induced knock condition.

- Steve

 

Dude, that's just plain silly. One of the main reasons to get a XEDE with SMART is to have equal-to if not better-than stock driveability at greater than stock power levels. This is especially true at partial throttle or lower rpms (aka daily driving on the street).

V2 used to have a similar problem for me: when I would try to go WOT between 2500 and 3000 rpm, the engine would stumble badly. Hopefully freedom's issue can be resolved by adjusting some of the SMART parameters.

l8r)

 

We have been saying that since day one.....make your custom adjustments to the smart map.

Smart is reactive....it isn't going to prevent knock from happening....it will react to it.

You may get some more timing and depending on how you modify the smart table you may be able to lean out the AFR some but it isnt gonna be night and day difference. Going much leaner than 11:1 will create knock.....you can only do soo much. As for timing....unless you are using alchy, meth, or race gas, SMART isnt' gonna be able to do much with that either.

 

On that note, I'm stepping out of this one...

 

Shiv,

I just installed Launch Control in V3.2_0_2

I noticed SMART Boost only has the first load row zeroed out. Should I zero out the second row also?

My Fuel tables all show negative numbers except for the 109 Fuel table which reads positive numbers in just load row 20: XMCO 17 1 -0.2 -0.2 -0.2 -0.2 -0.7 -0.9 -0.9 -1.4 -0.7 0.0 1.4 1.4 1.4 1.9 1.9 -3.3 -3.5 . Is this ok?

Launch control; Is there anyway to adjust the sensitivity of the clutch switch or using the secondary switch?

When I shift 1-2 I'm usually resting my foot on the clutch so I get an early redline with the Launch control threshold. I guess this is what Dustin was telling me about . The car flies out of the hole a lot faster with less drama now. What a blast!

My SMART fuel map had been turned off so I think this may have helped too. The car feels really strong. I'll post up my thoughts once I have more seat time.

BTW Dustin, thanks for answering my incessant phone calls - even in the middle of your move! Your suggestion to read through the templates and Walk Through helped out. Hitting the F10 key (from the troubleshooting walk through section) brought up the maps for editing. Too bad I did all of that mindnumbing data transfer. On the bright side, I suppose it helped familiarize me with the software and I'll be ready when there are revisions.

Thanks for inventing these goodies!

 

Exactly!

I didn't have time to read this until now. Busy day.

Basically the default SMART fuel map (91 or 93) is setup for up to 11.8x in the 4000-5000 RPM range. What is good is that the system hits this AFR thus showing that everthing is working correctly. But and a big but, is that that is too lean for the cited conditions.

So I change the SMART fuel map to create a 11:1 AFR in this range and guess what. The car runs better.

Edit: Most likely because of the fixed load points I can't get what I would consider a smooth result given transition mapping between regions. I'm used to very smooth power delivery in all possible conditions with the baseline maps. I haven't found the template, nor my attempts to fix them to be close with respect to smoothness.

Notable is that if you run up through the gears and shift at red line the next gear starts at 5000 RPM. On the other hand if you are normally driving the car and need max power in the mid-RPM range the SMART fuel map creates a too lean condition.

 

A point that I tried to make in prior posts is that while SMART will correct, the normal operating point shouldn't be in a knock prone zone. If so the result is poor power delivery and poor drivability.

We were talking today at work and I was asked if the maps without SMART on yield a good tune, then what is the point of SMART? I'm guessing right now it is to correct for non-optimal conditions that could be weather related, etc.

What impressed us with the logging that I now have is how good the off the shelf maps are.

 

I agree the off the shelf baseline XEDE maps are very good......at least for my tune it runs a solid knockless 11.2:1 across the entire power band.

This being said I dont have many mods and the ones I have are fairly standard so I assume this helps my tune. Once you get into cams, cam gears, intakes, intake pipes, IC piping, ect ..... that might change some.

I used the SMART to tune my baseline maps....basically I was able to pull some fuel from up top and add in a little timing here and there. Seriously though, the majority of the improvment is coming from fuel map. Making a tenth of a degree of timing change isn't really doing anything compared to yanking some fuel out.

Basically....most tuners....set the boost at a comfortable level then start pulling fuel out until they see knock....then add a bit in and call it good. When on race gas they typically up the boost a few psi and add in one or two degrees of timing. Anything more can lead to problems even if you dont see knock.