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Old 04-28-2014, 12:47 AM   #346
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Quote:
Originally Posted by Martin Crisp View Post
From what I have seen from simply watching the VTA cars, I think given the very low power the key difference will be running very very little rear toe and and fairly low rear roll center to free up the car so that it carries more momemtum in the corners.
Those plus optimum gear ratio and usually how you sauce the tires can be critical. Usually FDR is in the 3s mostly.
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Old 04-28-2014, 05:00 AM   #347
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Thanks for the VTA tips. Will try it out at the next race.
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Old 04-28-2014, 12:35 PM   #348
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Questions??

hum!

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Old 04-28-2014, 04:50 PM   #349
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5.5 on 3s on a parking lot-
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Old 04-29-2014, 03:47 PM   #350
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How could I calm my car down a bit? I had my local fast guy drive my sedan yesterday and he told me the setup felt very aggressive and a bit hard to drive. Running an xray t4 w/ RSD chassis upgrade on medium grip carpet.

350 oil 4 hole 1.1 pistons all around
2.3 springs
5mm RH all around
About 2mm droop ORH all around
Suspension blocks shimmed up 1mm, about equal to medium roll centers stock xray mounts
1mm shims on front camber links, both inner and outer
1mm shim inner rear, 4mm outer rear

Edit: I'm also running pretty narrow and a pretty short wheelbase, all around. Also got a bit of front sweep.

Love this thread, and thanks for the help!
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Last edited by hyujmn; 04-30-2014 at 12:04 AM.
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Old 04-30-2014, 12:09 AM   #351
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Originally Posted by hyujmn View Post
How could I calm my car down a bit? I had my local fast guy drive my sedan yesterday and he told me the setup felt very aggressive and a bit hard to drive. Running an xray t4 w/ RSD chassis upgrade on medium grip carpet.

350 oil 4 hole 1.1 pistons all around
2.3 springs
5mm RH all around
About 2mm droop ORH all around
Suspension blocks shimmed up 1mm, about equal to medium roll centers stock xray mounts
1mm shims on front camber links, both inner and outer
1mm shim inner rear, 4mm outer rear

Love this thread, and thanks for the help!
I ran the RSD chassis and found it was easier to drive with the top deck shimmed up 1mm. It also helps with the tweak using that chassis combined with the top deck. The holes were drilled incorrectly by a fraction of a mm and can cause the car to be tweaked. I had to shave my top deck slightly on each end to get it to fit properly.

Also try laying your shocks in one hole front and/or rear and lengthening your camber links to the middle hole front and rear. I had success with droop settings of 3.0 ORH in rear and 2.5 ORH in the front.

You could also try a little arm sweep in the front to slow the cars initial reaction slightly.

Lastly, the hinge pins included with the RSD chassis are softer than the stock xray hinge pins ... They bend easily. Check both the front and rear to make sure they aren't bent causing binding.

The car should feel a lot better if you make these adjustments.
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Old 04-30-2014, 12:12 AM   #352
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Also, make sure you are using the Mazda speed6 body with that chassis... Most of the other bodies are too aggressive to drive it consistently on carpet!
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Old 04-30-2014, 12:22 AM   #353
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Forgot to say that I'm running the v1 chassis so it doesn't have the newly designed top deck. I've got .5mm front sweep in the front, so already doing that.

Haven't tried shimming the deck up, though. I'll try that next time I get to the tracks. I'm already running medium camber lengths all around.

More droop is something I'll also play with and I'll also be playing around with a gear diff with 2.5m up front.
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Old 04-30-2014, 12:38 AM   #354
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6 deg caster blocks are a must if you run the gear diff. Good luck!
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Old 04-30-2014, 02:45 AM   #355
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I'd start with these few simple tweaks, seeing that the only issue you have is the car is too aggressive....

Lay down front shocks
Less front droop
Softer front springs
Lower front roll center
Longer front camber links
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Old 05-01-2014, 09:44 AM   #356
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Quote:
Originally Posted by hyujmn View Post
How could I calm my car down a bit? I had my local fast guy drive my sedan yesterday and he told me the setup felt very aggressive and a bit hard to drive. Running an xray t4 w/ RSD chassis upgrade on medium grip carpet.

350 oil 4 hole 1.1 pistons all around
2.3 springs
5mm RH all around
About 2mm droop ORH all around
Suspension blocks shimmed up 1mm, about equal to medium roll centers stock xray mounts
1mm shims on front camber links, both inner and outer
1mm shim inner rear, 4mm outer rear

Edit: I'm also running pretty narrow and a pretty short wheelbase, all around. Also got a bit of front sweep.

Love this thread, and thanks for the help!
Glad you like the thread...sorry I have been away from it for a few days.

Here are some suggestions for you to try.

1) increase the shock oils to 550 front and 450 rear. This will help slow down the transitions and take away some agressiveness.
2) Increase your spring rate from 2.3 to 2.4 or 2.6 all around. This will help reduce the amount of roll and make the car a little easier to drive consistently. You might find the car may start to traction roll with the 2.6, but try it anyway.
3) I would also make your wheelbase longer. This will also slow down the rotation of the car going in and out of the corner, again making if feel less agressive.
4) get rid of the sweep up front as well.
5) start with the track width as wide as possible within the rules.



Quote:
Originally Posted by gocoogs View Post
6 deg caster blocks are a must if you run the gear diff. Good luck!
If you run the 6 deg caster this will make the car have more steering in the middle, and feel a little smoother on initial turning. This might make the car feel less twitchy but in my experience this creates too much mid corner steering. If you run the 6 deg caster, you might want to ad some anti dive in the front so that you are running about 5 degrees caster. This will take away some steering in the middle

Good Luck.
Martin
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Old 05-04-2014, 12:45 PM   #357
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Hey Matin, when your back from racing your MX5 ;-)

Something I can't get my head arround.
My car feels good, is consistand and has good fast times.
With Sorex (32/36) Tires I have no issue's. But with the Ride REX34 tires I have a "groove of death" at all the four corners of my car.... I just don't understand.
Does it have to do with the airgap? With the additive, with my set-up? I check the glue every run, so that's no option.

My set-up can be found at:
http://www.petitrc.com/reglages/schu...er20140427.pdf

Hope you can give me some directions or ideas.

Thanks in advance.

Robert
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Old 05-05-2014, 12:50 PM   #358
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Can you please explain why you recommend more damping in the rear to give more steering off and neutral power. Thanks
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Old 05-05-2014, 04:00 PM   #359
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I am curious what the advantages/disadvantages of running a front gear diff with the 1-2.5 million weight oil versus a spool are and when would you use this? Also why change the pistons in the shock as opposed to just changing to a thicker or thinner oil? Thanks!
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Old 05-05-2014, 04:30 PM   #360
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Default Puzzled....

It has been brought to my attention that spur gear diameter has an effect on handling. Never thought about this before. I just figured we were shooting for a certain FDR and we were good. So, what can one expect to feel by switching to a larger spur gear versus a smaller one?
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