fdl

Is the TL the first acura to have both VSA and LSD? Since they have both, is there a way we can get an LSD into our TSX and still have the VSA work?

darth62

What about the CL Type S? Didn't that have VSA and LSD?

fdl

Well...it had LSD for sure..but I dont know about VSA

provench

The CLS 5AT has VSA and the 6MT CLS has LSD, but not VSA. So yes I think the '04 TL is the first car to have both from Acura ... not sure how they work together though

fdl

OK thats what I thought. So maybe, ... just maybe, there will be a way to get the two to work together on the TSX as well. I'm sick of my inside tire spinning when I accel through turns, but I dont want to give up my VSA.

TinkySD

someone should put the lsd from the integra type-r on their car

jackspat2

Some info on this:

http://www.acura-tsx.com/forums/show...&threadid=1908

Test_Drive

Hey folks,
Phantom Grip was now updated their website to include the TSX for LSD upgrade kits.

Of course, I don't know if this would be any good -- but that $3xx price seems pretty attractive, as opposed to the $11xx that Quaife might want.

http://www.phantomgrip.com/product_lists.php?make=Acura

Test_Drive

fdl

The question is how will it work with the VSA.

Since VSA is just software , perhaps it can be reprogrammed to account for the LSD. Its more about traction control anyways. What I would ideally want is for the VSA to make yaw adjustments but to leave tire spin from accel alone completely, and let the LSD handle that.

sauceman

I think the VSA is pretty lenient in that it is not too interventionnist, so I would like to think it would be able to tolerate an LSD without too many difficulties.

fdl

Maybe. But I dont want to be the first one to try

Test_Drive

Exactly. We need a guinea pig!

Again, I'd assume that in most conditions the VSA would still work as before -- remember that LSDs typically don't give full lock, and that the brakes should be strong enough to take up any extra torque that the LSD might be sending to the wheel that VSA is applying brakes to.

Holy run-on sentence Batman.

Test_Drive

TSX007

I'll be the guinea pig...but only if it's a quaife!
No application for a TSX.......yet.

DEVO

Is VSA traction control and LSD is yaw control?

If true, aren't these system independent in what they do so they can coincide with each other nicely?

fdl

No, VSA is computer controlled yaw AND traction control. But it works by using the brakes and taking away power from both wheels. LSD is really only traction control and will transfer power from a spinning wheel to a wheel with traction, thus allowing you to be stay at optimum power through turns, etc.

DEVO

Ok. so i got them backwards but they still seem to operate independently from each other... right? I mean that's how I'm reading this.

fdl

Ya, they are independant, but having them both around may lead to some confusion if they were not designed to be there. Lets says you are turning and your inside tire starts spinning...you now have both the lsd and vsa who want to correct this problem.

Its not a big issue, just something that needs to be considered when designing a car with both. Maybe an lsd will just drop right into the TSX with no problems, or maybe there will be huge problems..who knows What I had mentioned in a previous post, is that ideally I'd like to turn off the traction control features of the VSA completely, and let the LSD handle that,. The VSA will then only come on during oversteer/understeer situation.

DEVO

but unless you exceed a certain yaw point, VSA should not kick in... in which case you want the LSD to kick in. is this not happening?

so in your example the inside wheel is just spinning but no oversteer or underster is resulting (for example) so LSD should kick in.

let's say you are getting oversteer, the VSA system will want to apply brake pressure to the outside front wheel... to correct for the oversteer and will override LSD command to apply pressure to the inside wheel. From safety point of view, you want this... take care of oversteer first then worry about traction control.

understeer should work better because VSA will apply pressure to the rear while LSD will worry about the front. again... VSA will take precedent.

I hope this is how it's designed. or something to this effect. Comments?

fdl

LSD doesnt kick in for yaw changes. In other words, it doesnt sense if the car is oversteering or understeering, just if the tires are spinning. This is why I would want to keep the VSA...for yaw control. And have the LSD for traction control.

DEVO

read again fdl... i added more.

ClutchPerformer

Don't think of the LSD as a system issuing commands. It's only a mechanical device in the differential that doesn't allow the two opposite wheels to spin at wildly different speeds. It doesn't apply brakes.

Edit: So in your above case, Devo, the LSD would stop the inside wheel from spinning (so that you can put power down) while the VSA would apply a brake to that outside front wheel (to get the car back in line).

fdl

Ya, what you are describing seems to be how you would want VSA and LSD to work together. So in the case of the TL where the car has both, the systems can probably do this. But if we just drop an LSD into the TSX, things may or may not work as nicely as in your description because our VSA was not designed to have an LSD.

DEVO

oh i see.... yeah you are probably right... but i have a feeling that they designed this things as modules so that one can override the other... but i wouldn't want to be the first.

STC

iTrader: (1)

I have never had the VSA come on in my car yet. I corner fast and everything.

i'd take LSD over VSA. VSA is useless and for people who cant drive.

fdl

I'm surprised to hear this. In rain is extremely easy to get your VSA to come on. The shitty tires on the TSX can mean wheel spin right up to 3rd gear. And as for getting it to come on when your cornering ... this is possible too, just corner harder For normal driving it wont come on , but believe me if you corner hard enough it will light up. Try it

I think VSA is more of a saftey net for snow and rain conditions. FOr performance driving a LSD will be much more useful. I just wish we could have both.

DEVO

STC... maybe you don't drive agressive enough.

STC

iTrader: (1)

I drive the TSX a lil less harder than I drive my Evo.
I better change the TSX tires soon cause they suck!!!!

and I'll say it again..........VSA is useless. I'll take LSD any day of the week!

Test_Drive

Would you be so kind as to try one out for us then?

DEVO

VSA is not meant to come on every time your drive. Maybe you haven't gotten into trouble yet. I suggest that you go to an empty parking lot and try accelarating in a circle... VSA should prevent you from spinning out.

matvey

Has anyone installed Quaife LSD? If so, have you had any problems with VSA?
Reason I'm asking is because my friend has installed one and his VSA light is always on (it's not working).

Thanks!

MBA

aaronng

Did he plug the VSS back in after reinstalling the tranny?

godfather2

why does it have to be quaife? what about cusco, or kaaz, or spoon?

matvey

VSS is the speed sensor that plugs into the tranny, right?
How would he go about testing to see whether it is working correctly?

Thanks!

MBA

JDMPLUS

What does the LSD do?

Thanks

matvey

Yes, he plugged in the speed sensor in and it's working properly (speedometer is fine).
But his VSA light is always on.
Any advice?

Thanks!

MBA

P.S. For those who don't know, LSD = Limited Slip Differential (do a search).