Is this Normal for a car with performance mods
Thread Starter
On The Tree
Joined: Oct 2006
Posts: 127
Likes: 0
From: 29 PALMS, CA / Dallas,Tx
Is this Normal for a car with performance mods I recently raced a buddy of mines 2001 Z28 a4 stock , we raced on a roll about 35mph and he kept up with me and we were both on overdrive and my car has lt headers , knn filter , lid, slp loudmouth, quicktime performance y pipe with dual cutouts. It feels like my car lost power with these mods and i seafoemaed 3 months ago .. i have no tune after the headers ,can bad 02 sensors rob your horsepower???? Or do i need to change my spark plugs because i havent since i bought it brand new...car has 47,000 miles on it . i have an OBD2 scanner and it doesnt throw codes for front 02's except the rear ones . can it read good for the front 02's but still be bad 02 sensors in the front?
Last edited by 02BlackMachine; Apr 25, 2008 at 08:02 PM. Reason: add on
there is alot of things to consider man. you cant just judge it by racing a car! everycar is different! but change the plugs and clena the o2's for now. and make sure u dont hav spark knock!
Thread Starter
On The Tree
Joined: Oct 2006
Posts: 127
Likes: 0
From: 29 PALMS, CA / Dallas,Tx
I think my 02 sensors are good ... as far as not throwing any codes except the rear one because i have race headers ....could this be a problem .....my car has shitty mileage
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Since you seafoamed the car 3 months ago, how many miles have you put on it??? If you've put atleast over 10k miles. You should seafoam it again, then do the following....
- Change Plugs & Wires
- New Fuel Filter
- Clean MAF & your K&N Filter (**** seem's to get dirty alot)
- Clean O2's
- Get a Tune for those Headers
Did you ever Tune Out the Rear O2 Sensors after you installed the LT's???
Im in the same process of doing most of this to my car. It's wasting gas alot more now, then it would. It doesnt seem to deliver all the power at times either. I do believe my O2's need to be cleaned though.
- Change Plugs & Wires
- New Fuel Filter
- Clean MAF & your K&N Filter (**** seem's to get dirty alot)
- Clean O2's
- Get a Tune for those Headers
Did you ever Tune Out the Rear O2 Sensors after you installed the LT's???
Im in the same process of doing most of this to my car. It's wasting gas alot more now, then it would. It doesnt seem to deliver all the power at times either. I do believe my O2's need to be cleaned though.
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Sweet jesus why do people run around with O2 codes and wonder why thier car sucks *****. Get it tuned to fix that problem and you will be fine. Alternately, you can just disconnect your O2's, front and back, and see how your car runs in open loop to get a taste of what it would be like with a decent tune.
Teching In
Joined: May 2007
Posts: 18
Likes: 0
From: Eastern Iowa
If you don't tune out the rear o2's your comp thinks the cats are not doing thier job and can cut fuel or run more fuel depending on the reading.... Someone mentioned limp mode which can also happen...... The popping you're hearing is probley unburned fuel in your exhaust igniting in the exhaust which means running rich and running rich can make a car fall flat on it's face at WOT...... Ever notice some black smoke out the back when you stomp on it ? Tune it, and watch it wake up......
