A global place for general discussion (Volvo, V3M or non-Volvo related topics).
Please introduce yourself here, your Volvo 300 hobby... NO technical support, parts requests or car advertisements here
My final assignment...ever!!! Having to do a vehicle case study, bit of a stupid assignment as we're meant to find out all sorts of data from books and the internet but no-one seems to give this kind of info so I decided to go for the 300 series!
I've managed to get most of the data I need but can't find roll centre or roll stiffness, also be useful if anyone knows about the manufacturing....
I'm using open wlan from building across a street, disconnects a lot, but can use a bit at least.
I have never seen roll center dokumented so I believe you need to take measurements and calculate it. If I have time in next month I try to do that too.
BTW, has anyone measured how many G's 360 pulls at skidpad yet?
I can't explain in english. The rollcentre is measured by the way the suspension(arms) is engineerd. Try to find books about engineering the arms etc. (Vehicle dynamics?)
My mate bloody sold his G-tech so can't measure it now I don't think they want that much detail in the assignment but the lecturer is totally useless and isn't contactable now until after my assignment is due! Spoke to other people on the course and they can't find any info about their cars so think i'll just leave it without
Frits is right, you'd need to calculate rollcentre from the angles of the suspension arms.. I used to know a BMW site that had an easy explanation of the subject, but I cant seem to find it anymore.
Would be usefull for you to know, since your car is probably lowered far enough to introduce some serious roll-centre issues.
I believe what happens is that your roll centre is moved further away from the cars centre of gravity.. the bigger the distance between those 2, the bigger the roll couple becomes (causing more roll, which you then combat with stiffer springs, which are bad for the ride qualities etc).
Most toyota AE86 guys fit roll centre adjusters to their cars when lowering them more than a couple of cm's (I have a pair myself).
IvanAE86 wrote:Frits is right, you'd need to calculate rollcentre from the angles of the suspension arms.. I used to know a BMW site that had an easy explanation of the subject, but I cant seem to find it anymore.
Would be usefull for you to know, since your car is probably lowered far enough to introduce some serious roll-centre issues.
I believe what happens is that your roll centre is moved further away from the cars centre of gravity.. the bigger the distance between those 2, the bigger the roll couple becomes (causing more roll, which you then combat with stiffer springs, which are bad for the ride qualities etc).
Most toyota AE86 guys fit roll centre adjusters to their cars when lowering them more than a couple of cm's (I have a pair myself).
Yes, thanks for the further explanation. If you change the position of the suspension arms, you can make the roll situation better. Then you also need to change the position of the steerhouse, to avoid bumpsteer.
I want to make a 3D model in an engineering program, but haven't enough time for it right now.. Also want to finish the engine of my 343 first. Then I'll start body/suspension engineering for drifting..
Afraid the assignment is due in by 2pm tomorrow If you have any information about the number made per year or the production techniques that'd be great but don't worry too much, its not really an important part of the assignment, thanks anyway though
I've just finished my last proper assignment, just a couple of little bits and two exams to go...
I don't think they want that much detail in the assignment but the lecturer is totally useless and isn't contactable now until after my assignment is due! Spoke to other people on the course and they can't find any info about their cars so think i'll just leave it without 
Might need to tweak the code a bit for it, but I'll get shot if I do that before a certain knock DSP... 
If you have any information about the number made per year or the production techniques that'd be great but don't worry too much, its not really an important part of the assignment, thanks anyway though 
