McPappy Racing

340512 Views 1727 Replies 205 Participants Last post by HitmanIII, Jul 6, 2016

James35

Discussion Starter · Dec 15, 2010 (Edited)

First, I'd like to thank everyone for participating in the original McPappy Racing (2008) thread. I'm starting a new thread without a date in the title (this forum doesn't let me change the original title). The old 2008 thread still has a lot of valuable information. As of the time of this posting, it has 1614 replies and 142,924 views.

In our continual efforts to provide excellent products, I'm happy to announce the release of the McPappy Racing Dart 2.5!
McPappy on Facebook

New changes for the Dart 2.5 Kit
Last year, across the country, many oval pan car racers have been struggling with too much weight transfer to the right front, picking up the left wheels, or even traction rolling. This happened when the rules changed from 41 oz to 36 oz to accommodate the lightweight single cell LiPo battery. We went from the heavy NiMH 4-cell packs and 2-cell LiPos down to a single cell LiPo. No longer having the heavy packs keeping the left side of the car down, racers discovered these handling problems with most pan cars. When running a mere 36 oz, we lost a considerable amount of left side (and forward) weight percentage. This new Dart 2.5 was designed specifically to address these problems. This new 2.5 car will run flatter and turn harder. It provides more left side grip than ever before.

The Dart 2.5 offers an offset T-plate and now a super offset T-plate position. We removed the centerline T-plate position. This also moves some weight to the left even more (all 3 shocks, center shock mount, T-plate, float bridge, supporting hardware, etc.)
We shortened the wheelbase a lot with the Dart 2.5!. You can slide the wheelbase anywhere from 9.75" - 10.06" (as opposed to 10.03" -10.32" with the 2.0). A short wheelbase allows the car to turn hard. (Imagine how poorly a dragster would turn on an oval track.) Traditionally, a short wheelbase can make a car too squirrelly, but we were able to get away with this for a couple of reasons. First, we took advantage of the Dart's notoriously excellent rear grip. The Dart's ultra low rear roll produces more rear grip than other pan cars as it keeps more weight on the left rear in the corners. (On the scales pan cars can look similar, but if you could weigh the LR in the corner, you'd see there is more weight due to the physics of a low rear roll center.) Secondly, the front locator track width adjustments lets you fine tune how much weight gets transferred making handling changes easy. When the car is handling right, you can get away with a short wheelbase and take advantage of it's turning capabilities.
We shortened the "neck" of the chassis so that the carbon fiber flex braces are now the same size (2.55") as the clamp links (CRC or Associated) giving you lots of possibilities.
We added new rubber o-rings designed to work with the carbon fiber flex braces which eliminates all tweaking.
Both motor pod plates were lightened some more.
The left motor pod plate was designed to get easier access to the T-plate nut.
The LiPo strap brace was moved to the rear of the battery allowing the battery to move toward the LF wheel. This increased front weight percentage.
The left side of the chassis was moved out .100" to increase the left weight percentage and also taking advantage of the newest Protoform D-HD nationwide body.
We added new standoffs to flatten the angle of the side shocks. In our testing, this has proven to be better.
We added an extra front hole in front of the battery and filled in the carbon fiber near that area giving you lot's of options to use small carbon fiber braces (shown in more detail below)