First off this is what I am running with: Vortech SC, vortech FMU, stock injectors, stock pulley, walbro 255HP pump, emanage blue with PnP injector and ignition harness. Vtec was set to 4100.

I took my car to the tuner yesterday and we ran into a problem that stumped us. Look at my dyno plot. At 8K I get a drastic dip in power and torque. While dynoing the engine sounds like it is choking at that one spot but sounds great the rest of the pull. We ran at least 10 pulls around the same HP numbers, changing the fuel and timing and still could not make the dip go away. It does run better lean (13ish) but it does not eliminate the dip, and its not safe. These dynos are from pulls with 11ish.

Some of our theories:
1. Bad spark, although I just had the spark plugs changed with OEM plugs while the SC was installed. And it is curious that it only has the problem at 8K. I may just get some new plugs and set the gap to 32 and see what happens. I am not sure what the gap is right now because we did not pull the plugs.
2. The fact that emanage only has a table to 8K. We set the parameters for 9K, but the map only went to 8K, so we can only change timing and fuel to there. But then it climbs nicely after the dip??


Has anybody run into this problem, or can help diagnose it?

 

Are you running the Vortech supplied MAP clamp and blackbox?

 

No, just emanage. I am not using any vortech electronics.

I asked the tech at the dealer about the plugs and he said the gap should be fine. So I am ruling that out.

 

I had horrible luck with the e-manage timing control on a stock boost vortech. I ended up running both the Vortech timing box and the e-manage injector harness.

Even with the the ignition map zeroed the car would misfire at 8-9K.

Take the ignition harness out and give it a try.

 

I never had any problems with e-manage and revving to 9K.

Did you experience this from day one?

Should I expect any problems? but I mean I've been running e-manage for a long while now and I redline my car from time to time w/ no problem.

 

I had the high RPM misfire with the e-manage from day 1. I may have been running different firmware than you though. My Laptop died with all my GSC files on it, so I can't tell you what firmware I was using with any certainty.

 

So I guess all it takes is a genious tuner to figure out how to use emanage effectively with a S2000. Mitch McKee at Vivid Racing (vividracing.com) dyno tuned my car today and now there are no more misfires. It turns out that the previous tuner was misreading my AFRs, and kept adding fuel to an already rich mixture. So I was choking on fuel up top (8.9:1 at 8K). Mitch was able to use emanage and get a very smooth pull from 2500 to 9000, without any dips. You cant even really tell when vtec kicks in under full throttle. Both HP and torque climb smoothly. The car feels awesome driving. I am going to bed now, but tomorrow I will scan the dyno and also I will see if I can post the fuel and timing maps for reference. I hope this will help as a starting point for people with the same setup as me.

 

here is a badly scanned dyno. I will try to get a better one up. I am also waiting for the tuner to send me the fuel and timing maps to post. I do not have the support tool, and he burned them on a disk but I cant read them without the software.