Originally Posted by Slapmaster6000

I had a little fun with 17.5 powered inline Xti this weekend at the Timezone GP. I put it P2 on the grid and was fortunate enough to grab the W. Randy was exceptional with his kit Xti at IIC, so I was easily inspired for this project. I wanted to make sure that I was using the latest springs (except fronts). This was a straight forward build with nothing funky done. The idea was to get a little more weight forward to reduce front tire slip in effort to see if I can reduce post run fade.... more so at club tracks then big events. I reversed the esc and battery location which makes the wires much shorter and efficient. I did have to use a piece of double back tape under the battery plate to keep it from sliding into the servo. On my car, I did have to sand the football a little to snuggle the esc a little closer. I wanted the shorter wheel base, so I chose the Altered Ego chassis which builds up at 197. I did use the Xti rear plate. I want to say the stock Xti chassis builds at 203. This car drove really well! I built it a week ago. I haven't raced stock since last spring but to my surprise I nailed the set up. Didn't lay a wrench to it all weekend! Now that's lazy racing.

Here's how I put it together:
Front:
.50 front springs (old black)
Kingpin .402" with 50k that I heavily neglected
5* caster block with 2.0 riser
1* camber
1f/2b caster
3.25mm r/h

Middle:
Red center spring (new)
25wt shock oil
Tall ball stud on the upper plate
20k tubes
.50 sides springs, touching
3.5mm r/h

Rear:
-1.5 droop
3.5mm r/h
17.5 KS @ 57* time, 57/72

Tires:
CRC Black fronts; 40.8, CA full sidewall, full dope w/ SXT
CRC Yellow rears; 41.5, no glue, full dope w/ SXT

Body:
Black Art R8C

Brian

Originally Posted by Adonis_mp

I recently purchased a used Xti and it came with a large selection of tires. I'm fairly new to foam tire, so can some please post the colors in order from hard to soft? I'm also going to be running on asphalt so what would be the softest tire I should be using?

Originally Posted by 1armed1

Our track is medium to high grip. 60x 90 I think, I'm at a 96.5 roll out.
I'm also running the alter ego chassis with the xti pod plate.
Set up identical except battery across the rear and 30 in the center shock.

My car is extremely easy to drive but I'm looking for more steering coming off the straight.

It is the straight into a sweeper finished with a 180.
The car really pushes in the 180.

I was recommended to try drag brake.

Thoughts?

Thanks
Dayton

Originally Posted by 1armed1

Thanks Brian,
For me it feels really "safe".
Others have driven it and said it turned to much, lol.

I'll try the .60's and 30k first then add drag brake if I need more.
Also I'm only doping just over half the front.

Power is no issue, I'll try another tooth.

Datyon

Originally Posted by martymiller

I'll be there tonight, I can help you if you want. Your competition may not be pleased if I make it faster.

Originally Posted by 1armed1

Good!
That means I have somebody to chase.

I was on a quick 65 at one point last week until the barriers started jumping out at me.

Originally Posted by TeamCarnage

Hey Dayton! You guys racing in Mishawaka?

Originally Posted by avink007

If they are CRC tires they go in order from softest to hardest:
White
Yellow
Gray-low
Pink
Magenta
Gray
Chrome
Purple
Black

Only catch is the rubber content in the tire, for example black and purple are really close to the same hardness but purple tends to get sticky toward the end of the run and will have more traction than black. Pink and yellow are like that too, about the same durometer rating but yellow has less traction than pink.

For 17.5 yellow rear / black front or graylow rear / chrome front are good starting points.

Originally Posted by poncec23

I can't seem to find a smaller spur than a 72 to gear a 21.5 up. I can fit upto a 52 as of now what mods are you all doing to get on larger pinions? I need to be in the 57-63 range. Thanks