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Old 10-10-2007, 12:55 PM   #1
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Default Tamiya F103GT Setup & Tuning

Can anybody provide some tuning tips for the F103GT Courage chassis? I'm new to this car and need a little advice.

Johnson 540 silver can 2-slot motor (I've read thru the tuning thread).
Sorex 28R tires.
Running on ozite.

Specific Questions?

Gearing?
Ride Height?
3Racing Aluminum Knuckle 0,1,2 deg?
Front Springs? (I heard ASC 10L2 springs work well)
ASC Shock setup? (Spring? Oil?)
Body?

Thanks
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Old 10-10-2007, 01:47 PM   #2
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Monster stock 27t
3000 stick pack
geared at 72/13 (48 Pitch) (our track is really tight)
takeoff 27's
center shock has 30wt oil
Black Associated 3.2lb spring
stock front springs
thick grease under the pucks
Hpi porsche 911 turbo body

running on ozote
the car is box stock built as instrustuctions
havent had it on the track yet
this is my starting setup
i think i will have to put some .22 front springs in as the kit ones i think are 2 soft

i will let you know more after my test session sunday
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Old 10-10-2007, 04:11 PM   #3
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I am running in the GT class so I will be using the Johnson 540 and I'm not sure of the gearing. I guess I'll start with it stock. I will be using ASC #8433 front springs for a 10L2 .024" I hear they work good.

The front hubs have tons of play in them with the stock steering rods so they need to be tightened up but I'd like to use the 3racing aluminum hubs just not sure which deg to use 0, 1, or 2.
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Old 10-16-2007, 01:33 PM   #4
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I ran the car last week and had a real rear traction issue as well as a spinning out problem. I tried running Sorex 28R and Take-off CS-27 and no luck. I think my problem could be two things.

1. ride height too low and battery retainer is touching causing the spinning out.
2. Not transfering enough weight to the rear of the car.

Any ideas guys?
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Old 10-16-2007, 02:03 PM   #5
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my car rolled alot and was experiencing some spinning myself

my battery cup dragged a little

i have 5.5mm in back and 4.5 in front
i have to work in rasing the fron a bit


put a 1mm shim under the shock mount wear it attached to the pick plate that attached to the rear pod that settled my car down alot but i was still on the edge.

i also removed all the grease from the pucks and loosened the top spring way up that aslo helped a bunch give it a try

i used tq traction cpound full back 1/3 front this compound seemed to work the best

o next time im guna try some 30's infront and 27's in bask
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Old 10-22-2007, 03:25 PM   #6
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I have a question. Will a lemans body (Toyota, Audi, or the porshe) fit on a gt chassis with out the tires rubbing on the body? I want to use sedan tires with a lemans (not the courage) body.
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Old 10-22-2007, 03:39 PM   #7
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the F103GT chassis is the basis for Porsche Cup which requires the HPI #7335 911 Turbo body. I also have a TC sedan body set up for this chassis for playing around.
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Old 10-22-2007, 10:21 PM   #8
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Well traction problem solved. Not having experience with this diff I had the cone washers both going the same way instead of opposing each other. So instead of having a spring it just dragged the diff action down. It seemed tight but I didn't realize how tight until I had it the right way. Man what a difference. When the diff is set right it seems way more loose than anything I've used but it doesn't slip.

The CS-22's work great on the rear though.

Starting to get it dialed in and it does runs great! I'm surprised at how fast it is with the Johnson 540. I know it's not 19T fast but it seems as fast as my TC3 with a stock motor anyway.
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