Last Friday I went to one of our local club racers prep shop and got the alignment checked and the corner weights checked; note before the last vintage race I was way behind and knew the alignment was going to be off given all the new parts that went on the car. We also had so many other things to sort (engine miss & brakes) at the track that I just lived with it.

Castor was off 4.7 left and 6.5 right (now 4.7 both sides, still using std radius rods)
Camber 1.3 right 1.9 left and now 1.3 (I bias ply Hoosier TDs, Hoosier says no more than -1.5)
Toe out 3/16 or 4.5mm now 1/16 1.5mm toe in. This is a starting point and similar to the spec from the C-sedan manual.

The toe setting was kind of expected, the car took a set in an odd way indicative of going to far with toe out. Initial turn in was rapid but then once the weight transferred you could feel it just barely wanted to wash out the front until the rear rotation caught up with the front. I've got a test day lined up so I will be workin with that......I also won't be surprised if the toe setting ends up close to where it was......only the lap times will tell.

Weight with 2.5 gallons of fuel and 140lb driver is 1814lbs /825 Kilos. The left to right is 50/50 (892/922) but front to rear is 53/47 (966/845) the car was 55/45. At some point the motor and tranny are going to be moved back another 20mm (it's already 25mm back) and lowered 25mm.
The overall weight is a bit porky but I still have all steel panels on it.

So the never ending tuning continues as I'm determined to get in the top 3 overall (last event I was 5&6th) My buddy has also pledged more trackside support again so we should find the extra couple of seconds. I'm also going to get the car on a Dyno and see what the A15 is belting out. Anything over 100whp will be good but hoping its around the 110 range. Last visit to the Dyno found 5hp through minor jet changes.........really enjoying the car more than ever.

Tom

Is that -1.3 camber or so the bias ply tires like positive camber?

What does the more neutral toe-in do?

Whenever any racer talks about camber, it's negative camber.
And if they say "more camber", they mean "more negative camber".
Crossply tyres don't like alot of neg camber compared to R-spec radials, but still need some neg camber to work their best during hard cornering.

Reminds me of the Datsun Competition book. Can get -1.5 degrees camber without buying camber tops. neg camber

Hi Tom,
How did you get that much + caster using the standard radius rods?
Cheers
Dave

Harry yes thank you that is negative camber.

Dave G, the bias ply tires run probably half the negative camber of a radial. Most of my competitors are on the same time but I'm using the Hoosiers for a few other reasons; first and foremost is the fit under the fenders despite the wider H190 rear (the proper thing would be to add flairs or get different wheels), second at 20.6 tall the lower gearing is a plus for the tracks I run, they drop the ride height as well and finally they are much lighter than the equivalent radial to the tune of 4lbs per tire.

Dave the reason I have that much castor with the stock radius rods is becuase the lower control arms were lengthened so that the front track matched the rear (H190) The wheelbase is now 1/2 an inch longer as well. My mid corner speed in turn one at Spring Mountain Motorsports Ranch went up 4.5 mph (now 73 mph) and the wider track has a lot to do with it.

Tom