Buick and Ecotec V6 Performance Upgrades

[Shaundy]

I have seen CAIs advertised as offering improved fuel economy and have read mixed reviews on this. What do your sources say on the matter?

 

[radarak47]

not sure on fuel economy unless it has something to do with the ECU being able to adjust the timing etc a bit better with the cooler denser air intake. the cooler air intake is the real advantage for more power (if only a slight improvement).

 

[randomhero365]

This might sound stupid, but how do I tell if my car is LSD or IRS??
I want to buy a catback but I need to know if my car is LSD or IRS..

 

[Cobez]

Your car can have both. LSD is a Limited Slip Differential (your diff), IRS is Independant Rear Suspension.

Your car could POSSIBLY have IRS, but i doubt it would have an LSD if it's a VP.

 

[randomhero365]

okay..
So if I put in a limited slip diff later on I would still have IRS??

 

[Cobez]

Huh? Of course you would (that's if your car even has IRS). Why would putting a diff in make you lose your suspension? They have sweet F/A to do with each other.....

They are 2 totally seperate items on your car.

 

[randomhero365]

lol, okay. thanks.
I was just making sure, I dont really know that much about all the mechanical stuff.

 

[randomhero365]

would it be more than likely my car has IRS?

 

[savage1987]

You're asking the wrong question. For a cat back you need to know which suspension setup you have, IRS (Independent Rear Suspension) or live axle. What model is your VP? If it's a Calais or SS it will have IRS, otherwise probably not. Take a photo under the car of the diff area and post it up, we'll be able to tell you which setup you have.


LSD stands for Limited Slip Differential, and this can be applied to either suspension setup without changing anything in the suspension itself. Whether your car has an LSD has NO BEARING on which exhaust system you need.

Sam

 

[randomhero365]

You're asking the wrong question. For a cat back you need to know which suspension setup you have, IRS (Independent Rear Suspension) or live axle. What model is your VP? If it's a Calais or SS it will have IRS, otherwise probably not. Take a photo under the car of the diff area and post it up, we'll be able to tell you which setup you have.


LSD stands for Limited Slip Differential, and this can be applied to either suspension setup without changing anything in the suspension itself. Whether your car has an LSD has NO BEARING on which exhaust system you need.

Sam

thanks.
that makes a ton more sense.
I have a Berlina VP '91, I'll take a snap in a few minutes.