95RedEX

I've had this happen a few times it seems:

If I lean out some of the upper rows in UberData too much, my car won't start. I've tried to stay away from 1000RPM and lower in both Low & Hi tables. Wondered if anyone else can confirm which cells affect startup?

Thanks!

projekteg

i believe start up is based off the fuel modifiers, i could be wrong though, but i'm pretty sure it's not based off of your actual lo cam map.

95RedEX

Well, I have my modifiers set to 60, 100 & 60. Suggested value is 53.

With a basemap from scratch, starts fine. Take out 10% to start from all vacuum tables except the 0.35. Starts fine. Pulled another 5% from the first 3 columns, 3% from the next 3 and tapered down my "leaning" for the remainder of the columns, still leaving 0.35 untouched... Starts fine.

But if I pull any more fuel from the upper left hand corner, doesn't start.

Maybe I need to find out wtf the fuel modifier values do



EDIT: I need to confirm that I have the Fuel Modifiers box checked. The bin is on my laptop at home :P

projekteg

why are you pulling fuel from the upper left hand corner, just curious? that's your 'idle' area and really only needs to be touched to tune your idle.

projekteg

(i suck at teh screen shotz :P )
red = idle
green = lo vacuum, usually only go here upon decel while still in gear (downshifting)
black = part to medium throttle cruising/acceleration

[img width=600]http://www.draglab.com/hmt/projektegdizzle/turbo2/lomap.jpeg[/img]

95RedEX

I don't know.... For some reason I really didn't think idle would be that rich.

Chris Harris

What size injectors are you using?

I had issues with a car with larger injectors...I had to enrich the idle area to get it to crank over correctly. Leaning out the idle area made it so it wouldnt start cold

95RedEX

They're DSM 450s. Problem is that it happens when I'm out tuning/datalogging. If I pull some fuel out of those cells, it won't start, even if everything is at operating temperature--not cold. That's happened a couple of times now. I'm just avoiding anything and everything 1000 RPM and lower till I get the rest figured out. I'm used to a shitty idle anyway...

I was out again last night, backtracked a few bins and now I'm getting a bog at 3,000 to 4,500 . At a roll, if I give it 3/4 throttle (not full on) the boost gauge goes to 0 and bogs till my turbo catches up. Usually it spools at around 3,500/4,000. I'm not boosting (not trying to) and looking at the 2D map, that area is just flat as a pancake. I might have to go back a burn or two and see what the deal is. From searching the UDF, I've come up with fouled plugs or a timing issue... Try, try again. I'm sure something will eventually work.

projekteg

try using 1.7. i've experienced the same problem on a couple cars (the bog right before boost like it's missing) with 1.8 :P

95RedEX

Usually the boost gauge will show it building pressure right up to 3,500.

It doesn't bog right before boost though (sort of). Instead, you give it gas and the boost gauge goes straight to 0 and whenever the RPMs get to 3,000, it'll start really bogging bad. When it gets to 3,500, it'll start trying to produce boost. When it gets to 4,500, it'll break out of that funk and go back to normal. The bin I was running before that was pretty good, so I might've just leaned out that range a little too much, too soon, giving it a flat spot.

So tonight I'm gonna go back a bin and give it a good run to see if I can detect any other bad spots. If I do, I'll try 1.7. Otherwise, I probably just pulled too much fuel from that range. I really should get some new plugs sometime too.

Thanx for the posts...