Causes for Understeer???

[jtmcinder]

Do you think Mitsu stayed with the 50/50 spider because they didn't want to buy or develop an unequal-split planetary -or- because they thought that a 50/50 was the better way to go?

I believe that Subaru went to a 35/65 planetary because they wanted to prevent wheelspin from happening in the first place. They have been following this logic for more than 15 years, going all the way back to the first time that they put a 45/55 in the Legacy automatic.

I also believe that Mitsu stayed with a 50/50 spider because they wanted the car to handle better at the limit. They have done the Subaru thing in some of their cars in the past, most notably the 3000GT VR4, but those cars were never meant to be tossed around like an Evo.

In summary, I believe that both companies succeeded in doing what they wanted to do. The engineers that work for these companies are not idiots. I wish that we could coax them onto this list.

- Jtoby

 

[jtmcinder]

In re-reading this thread this morning, one thing became very clear to me. Fedja is absolutely correct that using the terms "torque" and "power" interchangably is wrong. I'm sorry about doing this; I won't do it any more. It is both technically wrong and the source of great grief.

My only defense is that I was using the language of the person with whom I was arguing. But that is no excuse. When you hear a gruff voice from under a bridge, you are not supposed to climb down there and do the same.

- Jtoby

 

[Revolution]

OK so in the end I want to upgrade to a planetary type LSD with an evo like piggy back supercomputer bolted onto it ,right? This is what will make my dsm handle amazing right? After all that reading this is what I want right? Some one just tell me is theirs something outtheir like it or do we only have the quafies and the kaaz's.


Ok on a not so goofy note, couldnt we make OUR cars the dsm's react or act a certain way in the three variances of a corner by playing with the lsd's? Say a 1.5 front a 1.5 center and a 2 way in the rear ? Im not actually stating to use it in this exact order but by utilizing a different lsd's couldnt we minimize understeer or induce over steer.
Im laying this question out their in the hopes some one could give a rational answer.

I was hoping that someone could help clarify my question. Could our dsm's react a certain way according to the types of lsd's we incorporate into the drivetrain?

Say 1.5 front a 2 way center and a 1.5 rear would make the car much more neutral then say if it where to be setup with a 1.5 front 2 way center and a 2 way rear.

I'm trying to understand how a certain type of LSD would affect my 2g dsm ,and since this thread was all about lsd's then what better place to ask.

P.s sorry for my dead pan humor earlier ,I know I know I shouldn't quite my day job .

 

[jtmcinder]

Have you read these?

http://dsmtuners.com/forums/showthread.php?t=177117

http://dsmtuners.com/forums/showthread.php?t=177206

- Jtoby

 

[Revolution]

Have you read these?

http://dsmtuners.com/forums/showthread.php?t=177117

http://dsmtuners.com/forums/showthread.php?t=177206

- Jtoby

jtmcinder] You rock thanks alot ,this was exactly the type of info I was looking for.

 

[imprezaSTi]

"slow in, fast out"...the motto they pound into you in any good racing school (Jim Russell, with open-wheel formula cars, for example)...
"smooth is fast"...another one that, thanks to karting experience (Jim Hall school/race series), I cannot forget.
As others have said, refine driving technique. Learn to drive your car on a given track, learn to listen to what she's telling you, learn from what she tells you. Find braking points (most braking should be done before corner entry) and throttle pick-up points (in most cases, never later than corner apex) that work best, THEN tune the car to your driving style. Different things work for different people (personally, of the cars I've driven, I prefer a rearward weight bias...others may prefer different things)

Understeer has a lot to do with weight distribution at a given time. A more responsive car will respond more to weight transfer, requiring even smoother driver inputs. In almost any car, an LSD out front will make a huge difference, since the front tires are essentially useless if all they (one side or the other) do is spin, AWD and FWD alike, when you're on throttle.

Overall, a good driver with a light touch is most important...AFTER that, a front LSD (maybe center as well if need be), more responsive setup (don't ask me about suspension since you don't deal with suspension in karts, and you don't have to worry about setup when you use the cars provided by Jim Russell), and proper weight transfer technique will make the biggest differences.