Recent content by Dimman

Titanium is sensitive to notch damage (small nick in it will become a stress riser and rapidly fatigue), and has poor stiffness to weight.

Are you sure they are banned? Rays still makes forged magnesium wheels for racing (F1, ALMS, Super GT) applications. I was under the impression that cost played a bigger role than fire since they are basically 'disposable' in a racing environment due to fatigue and corrosion giving them a rather...

^ I don't think it had anything to do with fire. I think they have difficult to detect corrosion and can spontaneously fracture. (Of course if you then have a high speed magnesium hub spinning and grinding on the road, maybe the fire hazard becomes an issue too? Shudder...). There was a...

^ There was likely some gap between 'allowed' and 'possible'.

How much downforce did that Supra have, since that's the usual explanation of crazy rates in racing. Looking at the frequency conversions (with some guesswork on things like unsprung weight and mounting angles) makes the Supra's rates look much more reasonable. Ranging from ~1.25Hz f/r stock...

For me a lot of it has to do with understanding the 'why', not just copying the 'what'. A spring (coil) rate tells you basically nothing without knowing a lot more information. You want properly matched shocks, and just give your coil rate to a shock valver/builder guy nothing productive...

I'll be do some frequency calculations/estimates with the stock rates and some of the available combinations once I dig up some reasonable unsprung weights (wheels and tires are the easy part). Then maybe some weight transfer stuff (without bars for now...). This will be for a fair-weather...

Awesome! Thanks! I'll be picking up a new for me Mk 3 in a week or two, so nothing to measure yet. For the rear, it doesn't matter that it doesn't share the same pivots as the lower links? So the only thing to pay attention to is the change in angle of the spring/shock as it travels?

I'm thinking about getting back into Supras, have been doing some suspension research and would like to know if anyone knows the front and rear motion ratios on these cars. I currently have no car to measure off of. Search brought me this...

For anyone that thinks Toyota uses Rotas on OEM vehicles outside of the Phillipines, do a quick search of CAPTIN. This is a single Toyota plant in Canada which has an annual production of 3 times Rota's maximum capacity. Rota likes to mislead people with their OEM claims to imply that they are...

Why would an electric water pump be any less reliable than an electric fuel pump? You trust an electric pump to keep your engine from leaning out under load, what would be different for a water pump? From what I understand for the efficiency is that the impellers are usually better designed...

I thought you just want turbulence, and swirl was how 2 valve heads generate turbulence (air/fuel swirling in a circle as seen from looking down at the top of the piston), and tumble was how 4 valve heads generate turbulence (air/fuel tumbling in a circle as seen from the side)?

They are actually QA1 circle track dampers. http://qa1.thomasnet.com/viewitems/otorsports-circle-track-aluminum-shocks-large-body/aluminum-threaded-body-shocks?&plpver=1001 Any standard 2.5" spring will fit their coil-over kit. They also have small-body aluminum shocks that take 1.875"...

It's for a performance street setup. According to the sticky stock pre-89 is 461lbs front and 180lbs rear. So the rates are more than the stock rates, what I was thinking is if he said the fronts are too soft (implying the rears are ok), then the balance was off. So reducing the rears...

Are the shock curves and spring rates related? The reason I'm asking this is that the springs that this company sells max out at 650lbs. If the fronts are too soft is that going to cause oversteer issues then? So could I reduce the rears, if it's a balance issue? If the shocks are ok...