methanol + wide band= wtf

[missin' 2]

So here is my issue. I have ISAC for controlling boost and alky. I have been tuning my car on a home made alky kit. Non progressive. Denatured alky and water mix. That worked awesome last year.

So this year i have decided to upgrade to the isac so i could control boost and meth in one. I got a pump and sprayer from julio and insaelled the system. After working out some software issues with Bob i finally got the boost control to work.

Here is what has taken place. I only have 91 octane by my house so that's what i started tuning on. My chip is for 92. I was just tuning the car on only motor for 10.8 and as high as i could get the boost before i got kr. That worked all great. My wideband worked fine on the denatured and water mix and on any octane gasoline. (Its an lc1wb) so now i wanted to go more boost more timing ect.. Start throwing meth at it and the wb goes goof balls. High low all offer the place. Then peggs 7.5 and the led flashes code 8. Gets to hot to fast i think. Not sure. I have moved timing up and down and started with just a small amount of meth.

Any ideas....

 

[RmvBfrFlght]

> Denatured alky and water mix. That worked awesome last year.

If this was a 50/50 mix it is only a coolant as it won't burn.

Straight methanol is going to burn, so you are also adding fuel to the engine. Likely it is too much fuel and the engine is miss-firing. That will cause a WB to bounce off the upper & lower values.

RemoveBeforeFlight

 

[missin' 2]

Ok so how much fuel do i remove?

 

[RmvBfrFlght]

Ok so how much fuel do i remove?

Remove a few percent at a time until the burn is correct. May want to pull some spark advance out first, to be on the safe side. Someone with more experience may be able to add to this.

But, unless with the car, it is taking a chance. Tuning: start off safe and go slow.

RemoveBeforeFlight

 

[Razor]

Sounds like the wide band sensor is taking a dump

They don't last forever especially the cheaper ones

 

[missin' 2]

I just replaced the sensor a month ago. Only run 91-93 octane through it. Are lc1's prone to this?

 

[missin' 2]

I had it working great last night. It was right on 10.9 or so. I got it to stop bouncing and run fairly smooth now but the damn thing still cut out and went straight to 7.55. Then came right back to normal as soon a i let off. Wtf is going on here....

 

[87chrisss]

I had it working great last night. It was right on 10.9 or so. I got it to stop bouncing and run fairly smooth now but the damn thing still cut out and went straight to 7.55. Then came right back to normal as soon a i let off. Wtf is going on here....

Did you properly calibrate the sensor before putting in?

 

[TurboBob]

where is the sensor mounted?

I always had good luck with the LC1, but some guys have wierd issues. They seem to be sensitive to heat.

You might consider programming it so that it reads lean when it errors out, that way anything tracking the AFR will swing rich. (its a safer failure mode.)

Bob

 

[87chrisss]

i have never had a problem with the o2 sensor but i always calibrate it as its stated on the manual. It clearly states if not properly calibrated it will cause it to fail prematurely. i have even ran a 1/2 tank of leaded fuel of 110 octane and ive sprayed the crap out of my motor with my home made meth kit i made.

 

[missin' 2]

Did you properly calibrate the sensor before putting in?

Yes, i do it probably every two weeks.

 

[missin' 2]

where is the sensor mounted?

I always had good luck with the LC1, but some guys have wierd issues. They seem to be sensitive to heat.

You might consider programming it so that it reads lean when it errors out, that way anything tracking the AFR will swing rich. (its a safer failure mode.)

Bob

The sensor is about 2 feet down from the turbo.



How do i program that. Through the lc1?

 

[missin' 2]

What sample rate do you use on the lc1. I think im at 1/3 sec. That gives me a better average i think. Anything wrong with this?

 

[missin' 2]

Well this problem was solved. I have this motor in a 1970 GS, so all my 12v power comes from a feed off the battery to a fuse block inside the car to power all my gadgets inside the car. And likewise with the switched 12v from the ignition on, but i used a pin on the fuse block on the origional gs harness for the power.

So when the isac commanded the alky pump to go there was a noise coming back to the switched fuseblock. That is where i had both the isac and lc1 suppply coming from. That noise was causing the lc1 to cutout and lose its feed.

So i added another relay and fed the lc1 from the constant 12v fuse block and got an ign trigger for the relay from the sterting column.

Problem solved. Now i need to figure out why i can't run my powerlogger software and isac software at the same time on the same comp.