I have a problem. If any experienced AEM tuners have a few minutes to take a look I would appreciate it.

Personal Background - No experience in FI.

Car Background - Basic Comptech kit without aftercooler installed in 2003 (Novi 1000, +/- 6 lb pulley, comptech fuel pump, full Comptech exhaust, spaceship FPR). I bought it last month with 25,000 miles. Dyno'ed at 271 before changes.

Changes done at shop (just got car back) - Added aftercooler, upgraded heat exchanger, Bosch Cobra water pump, 9 lb SOS pulley, upgraded 1000 injectors, AEM v2, stock FPR. Final tune delivered 345 / 203 on 10.2 lbs boost on the dynojet. All looked good.

I picked it up Friday, traffic was horrible but even in stop and go low speed something didn't feel right. It would buck slightly under load and certain conditions such as 35 mph in 4th gear under light throttle - not normal, just not right.

Later Friday I was able to get on it. Ran to redline in 1st (pulled strong all the way), dropped to 2nd and violent bucking. At this point I started looking for obvious mechanical issues - checked all vacuum lines, belts, injector connections, and changed the plugs (which were fine). Took it back out and it ran VERY STRONG. Pulled hard to reline through 1st, 2nd and 3rd. Pushed it again and it got weaker, pushed it the 3rd time (fully warmed up at this point) and same severe bucking going to second gear.

Next I ran rpms steadily higher while in 2nd gear. No problems until +/- 6,000 rpms, severe bucking, rpms erratically jumping from 6 to 6,500. In neutral, no problem holding rpms at any level all the way up. WOT, no problems. The issues are under load and when fully warmed up.

Last night I downloaded the AEM software and got my calibration - see link. I understand nothing... I tried to setup a conditional data log but couldn't get my settings to take. It was late and I was tired though.

I plan on getting back with my shop, but he works a pretty light schedule. I don't want to wait a week if it's a simple tune tweak. Any help would be much appreciated.

AEM Tune: https://docs.google.com/file/d/0B-OL...it?usp=sharing

 

Whats with the massive dip in the graph at what I am assuming is your area where the rpm problem is ?

Did you just call and talk to your tuner ?

Your first incident with the driving in traffic you described is more partial throttle/ off throttle tuning. My car will do it slightly if I am not "heavy" enough on the gas because its speed density now (evo not S2k).

I can't open your file because im on my phone. But I can look later. I am no tuner by any means but I am a bit familiar with the topic

 

I emailed him, but won't be able to talk to him until tomorrow unless he calls me. I see the dip too. It was bad on the initial pull but better on the final - but still there. The 2nd gear shift should have me above the dip, but you're probably right that the problem is in that range.

 

That map does not look tuned at all. Every value for positive pressure is the same.

I opened the "ap1 supercharged" basemap from AEM's calibrations, and it looks the same. Perhaps maybe you have a different cal?


I personally would avoid higher loads on the motor if that is indeed your cal.

Are you still on the stock map sensor?


Here is my last cal with my oem map sensor, its for a 2.2L with a 6262 / id1000 / oem map.....so I don't know how much it will help. At the least you could compare them a little.


Save file as
http://exhaust-driven.com/s2000/6262...mmap.01V24.cal

 

The work is done, stock map sensor.

Now, I guess it's possible what I posted is not actually on the car, but I don't understand how that could be. Especially if you're seeing something that matches the ap1 basemap.

I installed the AEM software on the laptop, plugged it into the unit, turned on the key, it connected and values populated. I saved the calibration to a new folder created on the desktop - the file I posted. No way I got it mixed up with the files AEM provides.

I did not upload, change any values, nothing, other than in the Logging Setup. Just clicked on the different tabs and looked around. In the Log Setup, I would change a value, click on a different field and the change would revert back - I did not load, save or reset in this window, just closed out of it.

Is it possible my tuner replaced his tune with the basemap by mistake?

 

Its possible but very unlikely. I would not drive on it hard either until everything is figured out.

I see the dyno also has the a/f can you post the bottom part of the graph? . Its definitely running rich. what octane gas are you on ? Do you have a wideband gauge yourself ?

Whats your full setup parts list ?

 

This is because boost fuel trim is being used.

 

Ahh....I haven't used that yet.

Does that work well providing you have a good base for reference? I guess it would be easier / quicker.

I should have done that, lol.


I guess it still follows AEM's map. It just seems too erratic to me.

 

It allows for better fuel map resolution.

 

Yea, I'm not going to drive it. Bottom part of the chart is posted below - AFR seems fine. I have an Innovate wideband installed. All other mods are in this thread.

I done a bunch of reading today and looked at a few other tunes. The attached tune is definitely what the tuner did and not the basemap. But, he did not touch the basemap's VTEC settings, which could be at least part of the problem. Definitely could explain the dip in the hp graph - maybe the little cam did all it could do.