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Davemk1

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About Davemk1

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    Senior Member

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  • Location
    Bozeman MT
  • Se7en
    Westfield Mega S2000

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  1. The max allowable weight for a Seven to feel like a Seven is an interesting question. Before I built my Westfield (1220 lbs) I owned a supercharged Lotus Elise (1900 lbs) and while compared to most anything else on the road the Elise felt light it feels heavy compared to my Seven....which of course it is. Both are seriously quick and fun but they are different. What I wonder about is how light could an electric Seven be made. My Westfield has an S2000 engine and trans and they are not light and heavier than most 4 cylinder cars would have. On the other hand an electric motor would
  2. A sincere question.....how much do you think a Seven could weigh before it loses it's agility? dave
  3. The 13" tire will give a nice ride on the rough stuff due to the taller sidewall. If you pick tire size correctly the OD of a 15" tire and a 13" tire will be nearly the same. dave
  4. I'd like to try some slicks at an auto cross.  What brands might you recommend?

    1. Davemk1

      Davemk1

      Hello - I think you'll find that a true bias ply road race slick (not a DOT street legal radial tire) will give the best grip for a light car like a Seven. Some like to use a Hooiser A7 but I find them to be way too heavy and stiff for the weight of the car. The Hoosier A7 is a street legal tire and has steel belts and it so stiff that it's hard to lower the air pressure enough to work well. They were designed to work with a car at least twice as heavy as a typical Seven.

      So I would look for a bias ply slick....much lighter and more supple and huge grip. Hoosier makes some good road race slicks but they don't last very long and dry out and get hard. I have found that Avon makes the best tire but they are spendy. I found them to be worth the cost because they last a long time and grip well through their life where the Hoosiers fall off a lot over time.

      I get my Avons from Roger Kraus racing - he's the Avon dealer in the USA.

       

      You can experiment with different tires buying used. It can be hard to know how much tire life is left but they are much cheaper. John Berget is the guy for used race slicks.

      I hope that helps.

       

      dave

    2. johncg1

      johncg1

      Thanks Dave.  Had a nice call already with Roger Kraus.  

    3. Davemk1

      Davemk1

      very good.

       

  5. My Westfield has a Honda S2000 engine that revs to 9000 rpms and it sounds awesome. I love the feeling of the power building as the rpm's climb and everything gets frantic and fuzzy. It's awesome. It weighs 1220 lbs and makes 230+ hp at the wheels and very few cars will provide such fun and pace. And I'd give it up in a minute for an electric version if the weight can be kept reasonable. Being able to pull out of the driveway at 6:00 without waking the neighbors and launching at the local autocross and not pegging the dB meter and pissing off the people that live nearby would be ve
  6. These have been sitting around too long and I have no use for them so they need to go. The are Diamond Racing wheels lightweight steel wheels that I autocrossed on for 2 seasons with my Westfield. Never used on the street and no damage. They have a green stripe that is just pinstripe tape so if it's not to your liking it can be easily removed. The specs - 13" x 10" 4 x 4 1/4" bolt circle 4 1/2" backspace These wheels with some 10" slicks will make your Seven feel like it's getting swung around the corner on a rope. Great autocross wheel.
  7. Are you asking if I added vents? No....I didn't cut in any additional vents. I wondered about the airflow after it passed through the radiator so I did some string tests so i could see the way the air was moving. I suspect that much of the air that came in through the rad (as well as the openings inboard of the front wheels) went out the bottom of the engine compartment. This would of course raise the air pressure under the car and help create both lift and drag. When I closed off the underside of the car it changed the way the air flowed through the engine compartment. I now have a
  8. I did this on my Westfield a number of years ago....a splitter at the front, filled in around the sump in the engine bay, stock flat floor pan, and then a diffuser out the rear. Many will say that it's a waste of time given that a Seven is shaped like a brick and I completely disagree. To me it means that there's some big low hanging fruit and the flat bottom was easiest to pick. I get MUCH less lift at speed, it's quieter, and it doesn't feel like you've hit the brakes when you drop the throttle at speed. It works. Why wouldn't it? It's worth the time - go for it. dave
  9. I have a 2015 VW Golf wagon TDi. One of the nicest cars I've owned. More than quick enough, has the firm suspension of the handling package and I've averaged 43 mpg over the past 35,000 miles. Quiet and composed and the seats fit me very well (I'm 6'4"). It's awesome for road trips or running around town. The other 'daily' is a 2006 Honda Ridgeline truck that is used to two my Westie around. Many will poo poo it for not being a 'real truck' and I get it. But I don't need a real truck and this truck-lite is awesome for my needs. Default FWD (slips into 4 wheel of the fronts loose traction)
  10. Merry Christmas from Montana! dave
  11. That's interesting and I guess not all that surprising. I was looking at the Federals some time back after a friend said he liked them for autocross and noticed that in most sizes the treadware rating is 260....but for some odd reason 13" tires have a treadware rating of 460. They might not have much grip at 460 but I'll bet that they will last an annoyingly long time. dave
  12. Cool - I wouldn't worry about maintaining a small amount of toe-in....there's no tipping point that happens when you cross from toe-in to toe-out. In fact when the car moves up and down with weight shift the toe changes anyway. And unless you have solid suspension bushings they deflect when you hit the brakes to change the toe. So toe is kind of all over the place and there's nothing sacred about it. I have rivnuts that are mounted in the nose to support my front splitter and i just take these out and the string box bolts into those inserts. In the rear the bar affixes to the top of my re
  13. Right you are - I must have been thinking of the other guy with the understeer. Sorry about that. You are right on - weight shift is everything. Good on you for getting the feel for that! The attached photo show how much grip one can get with weight shift....the weight has shifted to the rear allowing it to hang on tight. Just look at the sidewall flex on that rear tire. It's working very hard. I've not found tramlining to be a real issue on the road when using lots of camber. Toe out can make it feel funny but camber has never been an issue for me. Unfortunately it seems very u
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