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After driving it to work today, I went to go start it up this evening, and got NOTHING. Crank, crank, crank. I ran high speed logger, and I get no data in my file. Seems like a dead cam or crank sensor from what little I know about the high speed logger. I think I grabbed a spare of each sensor when I bought parts for my build, so with a little luck, this will just be a hiccup...
Yup. Dead cam sensor. Swapped it out & it fired right up. Damn, that would have really messed me up if it was already dead when I was trying to get first start...
Car just utterly assploded. Sounded like a chirp from the wastegate at 3k. Then dead. The guy behind me said I shot a fireball, then something like a cigarette came out the tailpipe.
I heard nothing metallic when it happened. Just a chirp like the bov giving a puff, which it shouldn't have because I was at maybe 3500 rpm at a low map pressure. My wastegate is disconnected and wired open. Afrs were reasonable when it happened. Then the engine just lost all power. It didn't die, but it ran more & more rich and made zero power. I turned the ignition off. And now it won't start. I'm waiting for a tow.
I guess it could be the cat core? That would block the exhaust if part of the core was jammed in the exhaust. I'll try pulling the mid pipe when I get home.
I walked up the sketch stretch of road where it died, and look what I found!
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Well that sort of looks like the insides of the cat. First customer to have an issue with it. They are magnaflow hi-flow cats, so I was not expecting them to have problems. I would drop the mid-pipe, then take a look with a flash light inside.
I am not sure why blowing out a cat would cause the car to not start afterwards though.
OK, so what I thought might be a blowed up motor this morning turned out to be just a blowed up cat. This is definitely a case of shitty n00b tuning skills. I drove the car to work yesterday for the first time and did some VE auto tune. I kept fighting & fighting my AFR's. I could never really get it to play nice. I was running lean everywhere- like VE of 100 in cruising to get to target AFR. So, I cheated! I bumped the req_fuel value up by an additional 50% from 4.9 to 7.4. This helped, but something was still jacked up.
Then last night, I discovered that I had the MAP calibration wrong. The MS3Pro has an internal 4 bar MAP sensor. I wasn't calibrated for a 4 bar, and was reading 69 kpa in 101 kpa weather. I realized I've got in the habit of just looking at the boost gauge to eyeball MAP, and covering up the TS MAP gauge when real estate is short. So, I recalibrated the MAP last night, and started driving in to work this morning without setting the req_fuel back to 4.9 where it belongs. It was running mad crazy rich (10-12 AFR), and I was VE tuning to pull fuel out. I was in morning traffic going about 3500 RPM in 3rd when I heard what sounded like a BOV valve fart. Then power just took a dive, AFR's got super rich, and I had to turn off the motor.
The guy behind me was a standup guy. He blocked traffic with his car & helped me push it ~100 ft to a safe spot. He was all wide eyed & said: "Dude, that was nuts! You shot a fireball, then something shot out of your tailpipe!" I asked him what it looked like, and he said: "Uh, like a cigarette, but big and round on the end." Of course, my mind went immediately to horrible places (turbo, engine internals). But I had Lars put a cat on the exhaust, so the cat is pretty much the only thing that could escape the tailpipe.
Next lesson: Never assume your car is healthy enough to remove all tow hooks. I removed all baby teeth years ago, and didn't put any back on after this build. I had to walk home 2 miles to get baby teeth so the tow guy could hook up to the car.
Also, a metal core cat is really damn hard to get out even after it's been burnt to ****. I guess I'll just run fakey cat unless the stank drives me nuts.
Next lesson: Never assume your car is healthy enough to remove all tow hooks. I removed all baby teeth years ago, and didn't put any back on after this build. I had to walk home 2 miles to get baby teeth so the tow guy could hook up to the car.
You had a shitty tow truck driver. Baby teeth are not required to tie it down on a flat bed, nor on the dolly types of tow trucks.
No, he was good. I got the baby teeth before he showed up. We tied it down via the tires, but we used the baby teeth to attach the winch & pull it up on the bed. With the front lip being so low, I don't think he could have grabbed anything to winch without tearing up the lip.
All right! With MAP settings correct, req_fuel where it's supposed to be, this thing tunes right up! Funny how that works...
I wasn't logging, but it looks like VE auto tuned a couple cells in the row above 100kpa. Luckily, it's pulling a little fuel. I'll have to run a log to see how much boost I'm generating with the wastegate wired open.
All right! With MAP settings correct, req_fuel where it's supposed to be, this thing tunes right up! Funny how that works...
I wasn't logging, but it looks like VE auto tuned a couple cells in the row above 100kpa. Luckily, it's pulling a little fuel. I'll have to run a log to see how much boost I'm generating with the wastegate wired open.
I found that it was somewhere in the neighbor hood of 4-5 psi with the wg wired open when I had my IWG set up still on the car
After a nice road tuning session yesterday evening, The car wouldn't start this morning. I tried checking the composite log, but couldn't get anything. So today I bought a new cam sensor. I'm getting cam and crank signal just fine. Maybe I just didn't crank long enough this morning.
I still can't get it to start. I tried reverting to a previous log, and that didn't help. I can hear the fuel pump prime, and the exhaust smells gassy. I've attached a log & tune of my crank attempt. Can anyone spot what's going wrong?
05-09-2017, 12:26 AM
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