View Full Version : Racing-Tech AP-22 ???
Hi does anyone else on this forum have a Race Technology AP-22 Automotive Performance Meter ?
What im looking for is values for;
Mass
CdA
Roll Resistance
Tilt Factor
Roll Factor
Smoothing
No doubt this thing is sh_t hot but so far it has me a bit miffed.
Any help would be appricated ohh and by the way the values are for a Ibiza Cupra R.
Hi there crofter
just received one of those gadgets through the post the other day, but havent played around with it enough yet.
I don't have any of the figures you're looking for; mass however is quoted in SEAT brochure to be 1119kg for the Ibiza Cupra R.
1119Kg for the Cupra too, but don't forget to add your own weight to that.
Ben
Cheers Lads , does anyone else have any info on the other Figures I need ????
I im learning to do more and more with this bad boy and I would recommend it to any one looking to messure there Cars limitations.
Dormouse
15-11-2002, 13:03
Ask Bill (IbizaCupra) or Mark F (ZBoyd) or maybe Hopkinsgm (Glyn) They have all had this on test...
Although where the hell you pick up those other co-efficients from is anyones guess! anyone got a wind tunnel?
Dor.
Crofter,
Maybe you already know it, maybe you dont; there is a way to calculate CdA and Roll Resistance on your own (haven't done it myself yet).
The method is described in Race-Tech's website, the link is coastdown calculator (http://www.race-technology.com/WebPage/Utilities/Coastdown/CoastDownCalcs.html)
Of course, the results you get will be specific for your suspension height, rubber, car weight, road surface etc.
Cheers mate , however what about ;
Tilt Factor
Roll Factor
Smoothing
Any ideas ????
What im looking for is values for;
Mass
CdA
Roll Resistance
Tilt Factor
Roll Factor
Smoothing
Mass is 1119Kg + your body weight + any extras (ub etc)
CdA and Rolling Resistaance can be calculated as described in the manual.
A guide to Tilt and Roll factors is also given in the manual... I haven't got my manual here but I seem to remember it saying something like "A normal family hatchback would have a roll factor of around X whilst a sporty road car would be around Y...". Same idea for tilt.
Unfortuantely i can't remember the values off the top of my head, but as I have the PSS9 suspension kit set to about 40mm lowered and damping set to hard I chose values nearer those of the sports car than those of a standard family hatch.
Leave smoothing at default.
Unfortunately I haven't got my AP-22 here at the moment so I can't tell you the exact values I used, but unless you have the same suspension etc then your values would be a bit different anyway.
Whats the best 0-60 time you've done so far? :)
Also, did you buy the software for it?
Cheers
Ben
Well, I haven't had a decent 0-60mph yet, mainly because i pity my clutch and tyres.
I have a figure for rolling acceleration though, 80-120kph (i.e. 50-75mph) in 4th gear: took me 7,57 sec with another passenger in the car.
How does this sound for a totally standard 20VT beezer?
My car, which is the Ibiza 20VT Sport and not the Cupra, weighs 1194 kgr and not 1119...
Right cool I am just about compitant with this thing now so hands up all of those in here who has one and we can compare times and settings !!!!
So far I have seen 0.46 G in accelarion , mind you that was first lol but can pull 0.35 in second gear :)
I can get about 1g in corners (Thats what the Skyline is mean to be able to do!) and about 1.2g in braking. Best 0-60 in about 6.4 seconds but I reckon the car is good for 6.1 seconds on a nice flat grippy raod with a perfect run.
Ben
Dormouse
20-11-2002, 18:22
Be nice to see a comparison against a non-accelerometer based 0-60 to see how acurate it is...
Dor.
Hi guys,
I was experimenting a bit and found out what the Tilt Factor does.
TF can take 256 different values (probably stored in a 8-bit register), from 0.000 to 0.255; if you set it to .0256 it will automatically change to 0.000 (0.257 will change to 0.001 etc.).
Now, the acceleration value that AP/AC22 STORES at each sampling interval is the one it MEASURES, reduced by TF/255:
(accel. stored) = (accel. measured) x ( 1 - TF / 255 )
If you set the TF to 0 you have no reduction; if you set it to 255, you have no ...acceleration :)
Now, what i've just posted is pretty useless in better calibrating the TF for ones car, unless you know how much the car tilts with acceleration... just thought i'd share it though.