The Silver Buick's well Silver Buick!

[Beagle]

I had tractor weights in the back of my C10, it helped a lot. 250 # iirc. Two at 75 each behind the rear wheels, one 100# that slid around and dented things before I put a bed mat in it. I bet that Centurion doesn't care, it flattens the ice into steam with huge weight on thin tires! Probably smoke coming from them when you're driving. hehe. My dad's Mark IV was like that... 27 gallon gas tank and 5500 pounds does a lot for traction.

Lead shot bags put a lot of weight in a containable space. Might be worth a try with a couple hundred pounds behind the axle.

Meh - just drive the truck.

I may have asked before - will the Vega or mid 70's Camaro aluminum bumpers work on your car? Moot point after getting them rechromed I guess.

[TheSilverBuick]

I don't think any other car's bumpers will quite work on this car =P



I'll only drive it in the snow now if I'm headed out of town and think the snow will turn to rain within 50 miles of Ely.

[TheSilverBuick]

On YouTube I found my quickest run on Drag Week. Looking at the datalogs in that air my fuel pump capped out at 4,000rpm. I was right up to 15.0:1 AFR's at the top end Not good.

http://www.youtube.com/watch?v=3mfFQrQdpxk&feature=youtu.be&t=13m35s

[Scott Liggett]

Saw white smoke from your tail lights in both videos. I think black is what you want. Fat and happy. Not lean and scary.

[TheSilverBuick]

I know. I kept adding fuel to each run and the AFR's were not changing but the duty cycle was increasing so it was getting the command for more fuel, but the fuel pump was coming up short.

Here are scatter plots of the data from one of the runs that day. BTW, scatter plots are awesome. (but apparently the screen captures of them are not.. squint for the blue.)

This plot is RPM (x-axis), Manifold Air Pressure (y-axis) and the color is AFR.


This plot has Duty Cycle (x-axis), PulseWidth (y-axis) and the color is AFR. As the duty cycle is going up the AFR's are dropping, which is a sign of losing fuel pressure.


It shows very clearly about 4,000 rpm it starts losing control of the AFR as it leans out it goes to green from blue. Fuel pump can't keep up.

[Scott Liggett]

I know. I kept adding fuel to each run and the AFR's were not changing but the duty cycle was increasing so it was getting the command for more fuel, but the fuel pump was coming up short.

Here are scatter plots of the data from one of the runs that day. BTW, scatter plots are awesome. (but apparently the screen captures of them are not.. squint for the blue.)

This plot is RPM (x-axis), Manifold Air Pressure (y-axis) and the color is AFR.
[ATTACH=CONFIG]16125[/ATTACH]

This plot has Duty Cycle (x-axis), PulseWidth (y-axis) and the color is AFR. As the duty cycle is going up the AFR's are dropping, which is a sign of losing fuel pressure.
[ATTACH=CONFIG]16124[/ATTACH]

It shows very clearly about 4,000 rpm it starts losing control of the AFR as it leans out it goes to green from blue. Fuel pump can't keep up.

^^^^^ Chinese scribbles to me.

[TheSilverBuick]

The light blue to green blobs at the top right of both plots are bad.

[dieselgeek]

When CDMBill sees scatter plots in his log viewer, it's gonna be all over. LOL.


I'm learning to use them, but that's the kind of stuff Randal is comfortable looking at all day long.

[greenXpress]

I thought it was a radar view of the snow in Nevada........

[Beagle]

I thought it was a radar view of the snow in Nevada........

What, the HRM footage? I have to agree with the guys commenting the videos - use something besides an iPhone to take the videos. Does anyone know what they were using? That will save me a purchase. Yikes - that sucks.

Oh - you mean the solar flare picture up there?

[TheSilverBuick]

When CDMBill sees scatter plots in his log viewer, it's gonna be all over. LOL.


I'm learning to use them, but that's the kind of stuff Randal is comfortable looking at all day long.

We used them a lot in my physics labs in college. They are awesome for plotting three variable data. I like them for Tunerstudio because it gives you a great idea of where on the VE table your AFR's are going AWOL.

I don't think they are used well at WOT because throttle position (MAP) is pretty much a fixed value, but for driving around, awesome. Or how I used them to show the relationship between PW, DC and AFR.

[Beagle]

If I am reading it right and you're spending that much time above 80% duty cycle, pressure is definitely your friend. Maybe I'm not reading it right, but I would start thinking about a bigger injector personally. ?

[greenXpress]

We used them a lot in my physics labs in college. They are awesome for plotting three variable data. I like them for Tunerstudio because it gives you a great idea of where on the VE table your AFR's are going AWOL.

I don't think they are used well at WOT because throttle position (MAP) is pretty much a fixed value, but for driving around, awesome. Or how I used them to show the relationship between PW, DC and AFR.

when I was in physics lab, we were still playing with lathes and lead cell batteries.......not to mention the dreaded punch cards.

[TheSilverBuick]

If I am reading it right and you're spending that much time above 80% duty cycle, pressure is definitely your friend. Maybe I'm not reading it right, but I would start thinking about a bigger injector personally. ?

You are reading it right, BUT you are mis-interpreting what is happening. Pressure is my friend and what is happening is I'm losing pressure and trying to compensate by opening the injectors longer, which only exacerbates the pressure issue. If the pressure was maintained the AFR's would hold steady or go lower with the increased duty cycle, but they aren't. So it's showing my engine demands exceeded the output of my fuel pump. A bigger fuel pump will drop the duty cycle numbers a fair amount and the AFR's will be where they need to be. And if the duty cycle numbers are sub 85% then I'm good on injectors.

What's a punch card?!?!?!? Joking!

[Scott Liggett]

Are you going to use Aeromotive's pump controller as well? Yannick installed one on a customer's car, the Fox Mustang with the sbc 434 with Hilborn efi. It slows the pump down at lower rpms to prevent the fuel from getting hot.