How effective is your aero?
10-23-2016, 06:08 AM
#6
Interesting.... twice the amount of lift on the rear axle at 100mph than the front, and a cd of .36 for the 924 but .35 for the 944 with the wider body but rear deck spoiler and only 15hp required for 55 mph !
I wonder what a 924 would be with deeper front and a rear spoiler would be .33?
I need to do a MPG check on mine as it's incredibly good, I think it must be near the 40's
I notice your rear springs DSW are 450 lbs? that's got to be HARD and unforgiving for street use? good job you have a LSD..
R
10-23-2016, 12:33 PM
#7
Race Car
Thread Starter
second ad: "...high polar of inertia that resists cross winds & increases directional control." https://en.wikipedia.org/wiki/Polar_moment_of_inertia
I'm a bit confused, can anyone explain this? The car handles better than the 80's 911 when you apply throttle?
or...
I'm a bit confused, can anyone explain this? The car handles better than the 80's 911 when you apply throttle?
or...
Trending Topics
10-23-2016, 01:30 PM
#8
Rainman
Rennlist Member
Rennlist Member
R-- iirc the 951 was 0.33 with its revised aero
Noah-- just means that it doesn't change direction arbitrarily, tends to be stable since heavy engine and heavy transmission are so far apart near the ends of the car... Think about how aerodynamically stable a dog bone is
Noah-- just means that it doesn't change direction arbitrarily, tends to be stable since heavy engine and heavy transmission are so far apart near the ends of the car... Think about how aerodynamically stable a dog bone is
10-24-2016, 02:37 AM
#9
Haha, joking aside it's actually pretty good. I wasn't all for it originally with everyone claiming the Konis were supposedly these stiff things etc but I'd definitely recommend doing what I did. Even with all of my Racer's Edge delrin & poly graphite bushings it still manages to retain a decent ride. Sure, you cant bomb speed bumps but it just keeps the car super flat and doesn't rattle your teeth out. I have OCD when it comes to my car and it never bothers me on our rougher roads. It's probably as stiff as I'd want to go in a 944 though. My compliance probably comes from my stock rubber sway bar bushings. I like a firmer ride but I've gotten compliments on it on multiple occasions frompeople who know what I've done to the car so I figure it can't just be me
The LSD is pretty awesome too, just makes the whole package work really well especially in the rain and at autocross. The car is pretty much on rails, at least on the road.
Edit: See below..
Last edited by DasSilberWedge; 10-24-2016 at 02:48 PM.
10-24-2016, 12:25 PM
#10
Rainman
Rennlist Member
Rennlist Member
because of the angle of the shock vs wheel travel as well as the pivot point on the rear suspension, the "effective" spring rate of a coilover spring on a 944 is around half the "published" rate.
so his springs are advertised/designed as 450lbs but due to the 944 suspension geometry they are functioning as ~225. it's not really a factor of 0.5, but it's close to that.
the fronts are ~0.9 of the published/design spring rate for the same reason. so his springs F/R are about a perfect match...
10-24-2016, 02:45 PM
#11
just a quick note on this...
because of the angle of the shock vs wheel travel as well as the pivot point on the rear suspension, the "effective" spring rate of a coilover spring on a 944 is around half the "published" rate.
so his springs are advertised/designed as 450lbs but due to the 944 suspension geometry they are functioning as ~225. it's not really a factor of 0.5, but it's close to that.
the fronts are ~0.9 of the published/design spring rate for the same reason. so his springs F/R are about a perfect match...
because of the angle of the shock vs wheel travel as well as the pivot point on the rear suspension, the "effective" spring rate of a coilover spring on a 944 is around half the "published" rate.
so his springs are advertised/designed as 450lbs but due to the 944 suspension geometry they are functioning as ~225. it's not really a factor of 0.5, but it's close to that.
the fronts are ~0.9 of the published/design spring rate for the same reason. so his springs F/R are about a perfect match...
10-24-2016, 06:06 PM
#12
just a quick note on this...
because of the angle of the shock vs wheel travel as well as the pivot point on the rear suspension, the "effective" spring rate of a coilover spring on a 944 is around half the "published" rate.
so his springs are advertised/designed as 450lbs but due to the 944 suspension geometry they are functioning as ~225. it's not really a factor of 0.5, but it's close to that.
the fronts are ~0.9 of the published/design spring rate for the same reason. so his springs F/R are about a perfect match...
because of the angle of the shock vs wheel travel as well as the pivot point on the rear suspension, the "effective" spring rate of a coilover spring on a 944 is around half the "published" rate.
so his springs are advertised/designed as 450lbs but due to the 944 suspension geometry they are functioning as ~225. it's not really a factor of 0.5, but it's close to that.
the fronts are ~0.9 of the published/design spring rate for the same reason. so his springs F/R are about a perfect match...
You mean the Motion Ratio ?
This works out then my car's approx. 170 Front / 110 Rear Lbs then
It's too stiff on eneven surface roads but Ok on Smooth Roads.
It'll be interesting to see how this fares then in 3 weeks on a Track session I've booked?, I'm sure it will be too soft but I'm not sure by how much? the weather may help if it's pi$$$$ing down!
R
10-25-2016, 06:27 AM
#14
Yes I have seen this Info on Clarke's Garage:
http://www.clarks-garage.com/shop-manual/susp-15.htm
My 27mm Elephant Racing Rear (Hollow) T Bars are rated 220lbs,
and my front 2.25ID Race coils 190lbs.
The car is of course 500Lb's+ less than a stock 924S.
R
10-26-2016, 12:54 AM
#15
I'd imagine it probably feels pretty good without all of that weight and the extra power you gained (pretty cool engine you built BTW).
Out of curiosity, did you ever drive the car with the stock suspension after you took out all weight?
Out of curiosity, did you ever drive the car with the stock suspension after you took out all weight?