can someone point me in the right direction here? I've been working with some innovate motorsports data-logging stuff (i can log afr/map reading/rpm - real time and logging to a file), and my fuel map is within the ballpark. it's hard to get dead on since it's basically just me driving it. I'll log, park it, analyze the log, make changes, and repeat. it's taking forever.

but now i seem to have about 2/3 of the fuel map within reasonable range. The higher rpm/wot sort of stuff is kind of hard to get to (continue reading)

But the one thing the car is suffering on ridiculously is any throttle response whatsoever driving it. if i pull out from a dead stop and give it 1/4 throttle, no problem...seems ok. I pull out and give it 1/2, 3/4, or full throttle, it pulls no better than 1/4 throttle does. It takes forever to spool up rpms, etc. after a few seconds, it sometimes seems to play catch up a little, and i get a nice surge of power, but it's on the opposite pole of existence from instant.

It's only under load too. in neutral, it revs up fine.

I'm a newbie to the dfi 6 stuff, can anyone give me suggestions on what to try? I'd be glad to post data logs, dfi table contents, etc.

my goal for the holiday weekend is to get this tune the rest of the way.

thanks in advance,
Alex

 

Acceleration Enrichment -- Add fuel versus change in TPS position and/or change in MAP. Raise the numbers to add more fuel, lower them to lean it out. The farther right you go in each graph equates to larger instantaneous changes in TPS or MAP values.

Watch your A:F ratio when nailing it to see what needs to be done to the fueling.

 

What's the purpose of the AE fuel limit map setting on the DFI6 (global config screen)?

From the EMIC manual, it reads: This value will be the limit of invoking the MAP acceleration fueling. In simpler terms, this is the point, when surpassed, that there will no longer be any MAP acceleration enrichment. It is analogous to the point at which the power valve in the carburetor will no longer give any additional enrichment.

 

Mainly stability @ WOT. You don't want the transient fueling strategy to randomly cause injections when the engine is wide open and MAP may be bouncing around due to the physics of the air intake system. It would make it difficult for fueling values to be repeatable from run to run unless MAP varied the same way each and every time.

 

wow, old post revival.

as a quick rundown of where i went from this post, i did actually get a little more driveability out of it. the car got to the drivable point. there still was some (light) hesitation, but it ran and drove well enough to the point where i decided to bump up to a 2 bar map and throw my blower back on. And I had to start fresh with the fuel map consequently. I got the idle and no load tuning back pretty close quickly, but under throttle i was running PIG rich. To the point where it would foul out the plugs in 2 or 3 5-10 minute trips around the neighborhood. i ran out of summer, patience, and clean plugs around halloween and parted it.

in the meantime, a friend was asking me about my project, and he wants to switch a carbed car to efi, and what is the best way to go, blah blah. And I said that if I had it all to do again, I would have just bought the stealth ram and commander 950 combo all at once since it's a windows app, has a lot more flexibility, a lot more support/people using it online, and most importantly, wideband integration. Then doing some research online on prices for that friend, I realized how cheap the commander 950 kit designed for a tpi car actually is, and I couldn't resist. It was just delivered on thursday, and installing it will be my weekend project.

if anyone is interested in a DFI6 setup, I'm going to have mine for sale soon. Beyond the dfi 6, it will come with calmap and a crappy older laptop for tuning, as well as a bunch of people's config files i downloaded, and it will come with a lot of the sensors, since the holley kit came with pretty much all of them as well. My DFI setup had the knock sensor add on, and I have the harness for torque converter lockup control, even though it wasn't installed since my car is stick. I also bought from accel the adapter harness to run a small cap divorced coil distributor.