A few weeks ago I got a mail-in Dynoflash for my 04 Evo RS (mods are in signature). I used my portable wideband to datalog the AFR with the baseline tune (ignore the little dip in the mid RPMs -- it's a blip in the tach signal, not detectable inside the car). All pulls were in 3rd gear from 2000 to 7000 RPM (purple line is AFR and black line is RPM):



In the Dynoflash forum, Al confirmed that this looked good for a baseline tune and informed me that it was important to allow sufficient cooldown time between street pulls to stay out of the coolant temp correction maps (good advice as it would be easy to tune too lean for cool coolant conditions if you tuned off the AFR results including the offset for elevated coolant temp). So, I only considered runs after a few minutes of cooldown. The above AFR on the baseline is with the car warmed up but well after any WOT pulls.

This morning I did a bunch more 3rd gear pulls to dial in the AFR with my SAFC and settled on the following results after about 6 retunes:



Finally, using my Blitz Powermeter (which estimates HP using inputs from the speed sensor together with info. about the weight of the car, etc.) I compared the results in power output under comparable conditions by taking measurements with the revised map and then toggling back to the original baseline zero correction file on the SAFC and doing a series of runs on the same stretch of pavement (slight inclines and changes in temp make a very noticeable difference on the readings from the PowerMeter). The results for each configuration were consistent +/- 2 HP, so they seem to be reliable.

While I can't compare the HP curves throughout the rev range, I can see that peak HP has climbed a consistent 12-14 HP on the PowerMeter after the SAFC fine tuning of the base flash. So, I would say that Al was very very close in his through the mail flash. Considering how sensitive the car was to even 1% corrections on the SAFC, I'm impressed with his "best guess" on the through-the-mail flash. The corrections that I made were from 4000 rpm up and ranged from 2-6%. I let off at ~7000 rpm and didn't attempt to tune higher than that (stock cams).

Just wanted to share.

 

Good work, I usually find about 10 - 12 whp extra when I do the custom tunes over the through the mail base maps. I purposely leave the through the mail flashes slightly rich to account for car to car variance and fuel inconsistancys. Our great reliabilityrecord over the past year with the through the mail flashes with over 1000 units out there and no tuning related engine failures shows that a conservative approach is wise when doing remote tuning. Running the car 10 - 12 who lower than its possible peak is prudent when most end users do not have testing equipment. Of course with an accurate wide band it is very safe to lean it out slightly with the SAFC to dial in the a/f for the individual car.

I rellay like that FJO a/f softwear

 

It's actually the Innovate Motorsport LM-1 set-up. Whole thing cost me only $400 inlcuding the attachments for datalogging.

 

Good post. Was this with a SAFCII?

 

Yes

 

I finally got my SAFCII I'm staying in the -1/-2 range til I can afford a nice wideband.

I'm having a hard time reading the RPM part of your graphs... It looks like the numbers on the right side for the RPM might be cut off your picture?

Great info btw... This is going to be a great help in the very near future.

 

Shouldn't that line be pretty linear at around 11.5:1 ish? My flamesuit is on, because I don't want to state something stupid. I am having a hard time reading that graph as well. It looks to be cut-off on the right side.

 

There isn't anything more of interest on the right side of the graph. I just clipped it so that it would fit better on the page here. The software that I was using (which isn't the latest version from Innovate anymore) allows you to show RPM on the y axis or the AFR on the y-axis but not both simultaneously. The new software may permit this, but I haven't bothered to download it yet. The pulls are from 2000-7000. As far as getting the AFR more level, this actually is a very level AFR except for the top end where I intentionally let it go rich for safety. The SAFC doesn't allow you to adjust as finely as some software. There are about a dozen set points spread over the RPM range, so you end up with 300-500 RPM spreads between adjustment points and it interpolates from there. I don't think the end result was bad here at all. Usually when you see an AFR plot the scale is not broken up into such small units. If I had put the X axis in a less granular scale, the line would look smoother. And I was aiming for more around 11.2-11.3:1, not 11.5:1.

 

Nice work! I am thinking of getting a Innovate Motorsport LM-1 to help dial in my Water/Alcohol Injection set up when I finish my installation.

 

10.4 to 13 is good, I think that's where you want to stay mostly at 13 and 14.

 

Not sure what you are talking about. 13:1 or 14:1 is fine for part throttle cruising and the car will take care of that itself through closed loop adjustments based on the factory O2 readings, provided that things aren't too far off in the base flash. But when you are in WOT conditions and setting those open loop fuel tables (or adjusting your AFC for high throttle) you are risking knock on pump gas around 12:1 (especially if the timing has been raised) and 13:1 is definitely too lean for pump gas at WOT.

 

I know see how this chart is layed out, and, as a self tuner myself, can agree that it is a very nice A:F!

 

I am in complete agreememt with your post! I think that many are reading the black line for AFR as I was. The purple line represents the AFR.