Landracing Forum

El Mirage => El Mirage General Chat => Topic started by: McRat on October 27, 2008, 10:33:13 AM

Title: Need some adjustments perhaps?
Post by: McRat on October 27, 2008, 10:33:13 AM

We ran "Casper" our white GMC diesel pickup at El Mirage yesterday for the first time running a WWW.LANDRACING.COM sticker.  I mounted it the left rear of the tailgate, about two feet AGL.  Our speed dropped from 163mph to 155??? :?

Apparently the sticker placement was to blame, as I did not get chance to dyno test it at various locations.  I was told it was worth at least 25rwhp or 3 mph, but didn't see it. :x

Seriously, we finally got the truck tech approved to go up to 200mph and tested the chute, and the handling and traction was great.  But the engine kept shutting down at WOT over 3800rpm for unknown reasons.  Powertrain and tuning were identical to the last El Mirage event.  Time to spend some quality time with a dynometer to troubleshoot.

We only got one pass, and missed running again by 2 cars.

But it was still a blast.  Nothing like a Sunday drive at 150+ on a beautiful autumn day in the desert.

Thanks out to all the SCTA workers for another EXCELLENT event.  And thanks out to my "pit crew" of diesel lunatics":  Ralph, Johnny, Chris, Chris, Jason, Greg, Jeremy, Kat, and I probably forgot some.  Wish I could run faster, but got caught by surprise.  Truck has NEVER done that in 3+ years of racing.  And thanks out to my fellow Roadrunners!

While we were not going to run the last event in November, we are trying to find a way to make it anyhow.   It means our truck will not be at SEMA as we had intended, but it's more important to us to get the "B" for next season's attempt to go over 200.

Title: Re: Need some adjustments perhaps?
Post by: Tom Slick on October 27, 2008, 10:41:30 AM

Hey McRat,

We saw your pass yesterday and we're very impressed. Looked and sounded great :-D

Title: Re: Need some adjustments perhaps?
Post by: McRat on October 27, 2008, 10:49:26 AM

It ran sweet from 700 to 3800rpm, then shut off like a rev-limiter.  Normally we run the engine up to 4500 drag racing, and it pulls VERY strong up top.  GPS said it went peak speed of 180 at Bonneville and 175 at El Mirage, and we had more pedal left.

My job now is to  find the gremlin and put it to the floor in November.

Title: Re: Need some adjustments perhaps?
Post by: Kat on October 27, 2008, 12:35:19 PM

Here is the video of Casper's run Greg posted on youtube:-D   We will figure out a way to get to the November meet  8-)

http://www.youtube.com/watch?v=g33Y31gslbw

Title: Re: Need some adjustments perhaps?
Post by: DiveEZ on October 27, 2008, 04:20:08 PM

McRat

Here's an image taken yesterday of your truck

[img width= height=]http://www.diveez.net/post/081026225.jpg[/img]

Title: Re: Need some adjustments perhaps?
Post by: McRat on October 27, 2008, 04:25:04 PM

Quote from: DiveEZ on October 27, 2008, 04:20:08 PM

McRat

Here's an image taken yesterday of your truck

[img width= height=]http://www.diveez.net/post/081026225.jpg[/img]

Very cool!  At what distance from the start line was that?  Looks like the front is still lifting, and I need to know whether is was from torque or wind.

Title: Re: Need some adjustments perhaps?
Post by: DiveEZ on October 27, 2008, 04:32:27 PM

That's from about 75-100 yards out from the start line.

Title: Re: Need some adjustments perhaps?
Post by: Richard Thomason on October 27, 2008, 04:56:10 PM

If it has EFI instead of mechanical injection, check your battery voltage and all the grounds. I'm not that familiar with the new desiel rigs but that sounds an awfully lot like a typical voltage or ground loop problem.

Title: Re: Need some adjustments perhaps?
Post by: Kat on October 27, 2008, 05:52:07 PM

Here is the in cab video. 

http://mcratracing.com/k/155elmirage102608.wmv (http://mcratracing.com/k/155elmirage102608.wmv)