different extreme alignment.
#1
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not quite conventional wisdom.
After getting back from Laguna. I had just put on an NB front Subframe and V8 roadsters Arms the week before the event. I was out of time and had the car aligned at a local Less Schwab. I went for conventional wisdom and asked for 3 degree front camber and 2.5 in the rear.
One of the front camber bolts moved day 1 steering wheel went crooked and it became toed out. I moved it back with the aid of Kieth's Flyin Miata hub stands set it back to where the toe was right and camber was the same on both sides withot touching the tie rods. steering wheel was centered again. Kieths gage was reading a little over 4 degrees though. I assumed It wasnt really that much and the toe zeroed out perfectly as soon as I had the camber on both sides the same.
Now Im cheacking it again with my home gages and Im still getting just over 4 degrees in the front but when I check the back its only 1.5 degrees.
Here is the thing. The car was awsome. super well balanced and responsive and put down 350 hp amazingly well without getting twitchy at all. It was a rocket coming off corners. Front tires seemed to wear a little more on the inside edge but the rears wore even. I was running about 2.4 seconds under my previous best times. This may have me re-thinking conventional wisdome if what Im measuring is right.
4.0 degrees camber front. 1.5 rear for high hp car.
After getting back from Laguna. I had just put on an NB front Subframe and V8 roadsters Arms the week before the event. I was out of time and had the car aligned at a local Less Schwab. I went for conventional wisdom and asked for 3 degree front camber and 2.5 in the rear.
One of the front camber bolts moved day 1 steering wheel went crooked and it became toed out. I moved it back with the aid of Kieth's Flyin Miata hub stands set it back to where the toe was right and camber was the same on both sides withot touching the tie rods. steering wheel was centered again. Kieths gage was reading a little over 4 degrees though. I assumed It wasnt really that much and the toe zeroed out perfectly as soon as I had the camber on both sides the same.
Now Im cheacking it again with my home gages and Im still getting just over 4 degrees in the front but when I check the back its only 1.5 degrees.
Here is the thing. The car was awsome. super well balanced and responsive and put down 350 hp amazingly well without getting twitchy at all. It was a rocket coming off corners. Front tires seemed to wear a little more on the inside edge but the rears wore even. I was running about 2.4 seconds under my previous best times. This may have me re-thinking conventional wisdome if what Im measuring is right.
4.0 degrees camber front. 1.5 rear for high hp car.
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I run a spec miata as well, compleatly different animal. It is never straight line traction limited.
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I did not take pyrometer data.
My personal experiance Is I never saw laptime gains going much past 2 in the rear. I never reached any limit of gains in the front however as I always ran it max the adjusters would allow which was something like 2.8 to 3.
I knew I wanted to be able to quickly adjust rear camber because of running ProSolo in SSM. In ProSolo about half the difference you can make in your run occurs in the first 60 feet under full straight line traction limitations. The fast cars in that class run very little rear camber. 2.5 results in about half of a 275/35/15 working real well in a straight line acceleration. You usually never get out of second gear if you can get the gearing tall enough for the full run and my car is straight line traction limited between ~4000 -7000 rpm in second even with 275 A6 Hoosiers.
The spec miata is a completely different story it seems to like more camber period. That car is never straight line traction limited however.
My personal experiance Is I never saw laptime gains going much past 2 in the rear. I never reached any limit of gains in the front however as I always ran it max the adjusters would allow which was something like 2.8 to 3.
I knew I wanted to be able to quickly adjust rear camber because of running ProSolo in SSM. In ProSolo about half the difference you can make in your run occurs in the first 60 feet under full straight line traction limitations. The fast cars in that class run very little rear camber. 2.5 results in about half of a 275/35/15 working real well in a straight line acceleration. You usually never get out of second gear if you can get the gearing tall enough for the full run and my car is straight line traction limited between ~4000 -7000 rpm in second even with 275 A6 Hoosiers.
The spec miata is a completely different story it seems to like more camber period. That car is never straight line traction limited however.
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One thing I dont undrstand is why what I am measuring is so different than the printout from Les Schwab 1 degree less in the rear and 1 degree more in the front. Im pretty sure the rear did not move.
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Running 949 XIDA double adjustable shocks. 900/500 lb springs. ISC racing sway bars. 1-1/4" 1/4" wall front. 5/8" rear. Swaybars are a bit softer than they might seem because the arm lengths are longer than other bars. OS-Giken rear diff with slightly different internals than the standard miata setup for softer progression of lockup under high torque. Its 949's High horse power version. I tried 3 different setups with the diff before liking the feel of this one the best. unfortunatly measurments on the diff tune were seat of the pants as well.
Last edited by bbundy; 05-07-2013 at 11:57 AM.
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I normally get my car aligned at a race shop and corner balance it. I was out of time and just had it done at a local tire shop. They had the good hunter laser equipment. Guy seemed competent. I do not know about how well calibrated it was. I am checking it with DIY equipment so I might be skeptical of my ability to measure it accurately myself.
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Running 949 XIDA double adjustable shocks. 900/500 lb springs. ISC racing sway bars. 1-1/4" 1/4" wall front. 5/8" rear. Swaybars are a bit softer than they might seem because the arm lengths are longer than other bars. OS-Giken rear diff with slightly different internals than the standard miata setup for softer progression of lockup under high torque. Its 949's High horse power version. I tried 3 different setups with the diff before liking the feel of this one the best. unfortunatly measurments on the diff tune were seat of the pants as well.
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fyi - v8 supercars were live rear axle (solid diff) until this year when the Car of the future was rolled out. So not entirely independant suspension....I would think most info would be historical, pre this year at this point.
Two questions - Can you achieve that higher camber on stock NB arms? and what power level constitutes a high power car where less camber starts becoming a setup factor?
Crusher has been running 3.5 ~ 4.0 front for a while. Yup, less rear camber for high power cars.
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I also measured camber again after just rolling the car in. It is not so extreme now. More like 3.75/2.25. when I was measuring it before I had the fronts on FM hub stands and the rears not. I don’t think the rear suspension was not settled when I was measuring because I lifted thecar to get the hub stands on the front. I think I’m finding I need the hub stands for all four corners to do anything accurately.