Hi,

If i get a known tuners chip that's designed to be sold as a kit with Sport cats etc, am I likely to notice much difference using just the standard cats?

 

From what I understand, if you plan on harnessing upwards of 550hp, then it will help. If you do go beyond 500hp, you have other more serious changes to account for, ie, connecting rods and bolts.

Jaime

 

No, only around 440 with an RS tuning ecu. Money's tight, times are hard, can'd afford a faster car,

 

If money is tight, do not go sport cats....there are better places to spend your hard earned money. I'm sure others will chime in as to a viable "program" for you. Here's some info that may be helpful for you. You can then ask specific questions and you'll get alot of feedback from the guys here.
http://www.993tt.com/mods/mods.htm

Good luck, Jaime

 

If an ecu is designed to run w/sport cats...then use them. Otherwise, you're good w/oems.

 

It is designed to use them.

 

then get them...

 

RS tuned the program for sport cats, the engine should have them. You can run the stock units till you save your pennies.. However, you will take a HP hit and your acceleration will be a little sluggish vs running 100 cells..

 

Welcome to the slippery slope.....

 

Other advantages of sports CATs include better throttle feel, faster turbo spool up, and better turbo heat dissipation. I am doing mine just for the turbo-preservation alone.

CP

 

why not just get the bypasses they are half the price of the sport cats ?? Kevin what's your take on the bypasses ? thanks

 

A lot of opinions here. Has anyone run them on a dyno? I have, 7hp with an Andial 550 kit on a 3.6. Not exactaly a great bang for the buck mod. They are lighter than stock cats.

 

JJ, I agree. However, If you bought into a custom ecu which was programed using 100cell cats, then you can either make a choice not to use the 100cell cats and be less than optimum, or stay "true" to the ecu's program and use the 100 cell cats. If I were in a pinch for cash (and who isn't), I'd place my cash on more bang for the buck-assuming I had stock ecu.

Jaime

 

You have to tune for less backpressure, and like I said earlier, the 100 cell units free up the turbine side of your turbochargers.. The throttle response is greatly improved. Taking a stock engine and stock ECU and putting on 100 cell cats won't net you the HP worth raiding your bank account. However, tuning with the 100 cell units pay dividend. One thing that most of you guys are missing is that our 10 year old cats are getting plugged.. Some have had previous owners that have tracked there cars with 5bar FPR not adjusted and at idle the fuel trim was to high, thus burning up many units.. Don't just go and buy 100 cell cats, make sure that your tuning has been optimized for them.

I do not like running cat bypasses. I have seen to many issues with CEL, and idle/fuel issues.. However, if you purchase a ECU that is written for Cat bypasses run them..

 

OK thanks. So who makes 100 cell cats that bolt in. FVD and cargraphic right. 3000 bucks for them i bet.

I have seen only weld in cats that you need to cut in and wel to the factory pipes.

Great.