First of all Thanks Spanish for your advice . Since my vette is an LT1 it has heated sensors: two on each pipe before the cats and one after the right cat (or where it used to be) I have all three same way but now in the long headers.SPANISHVETTS said:I just saw this thread. I can’t believe more folks have not jumped in!!!
1st. You need 3 wire, (heated), O2 sensors. With out Cats you will never get the O2´s hot enough to work. No voltage out of the O2 = NO closed loop = Bad gas mileage.
The temperature advice is good. With a 160º T-stat and the stock chip I doubt that you will see much closed loop time.
After you install the heated O2 sensors the stock prom might pull the mixture back into tolerance. If it was my car I would hold off on the new prom until you have finished all of the mods you plan on. Most of the prom burners will re-burn the chip a time or 2 for free but it is still down time while you send the chip away to be re-programmed.
SPANISHVETTS said:Do a search for ¨field service mode¨ I remember reading about jumping 2 pins on the ALDL to check the open / closed loop mode but I do not remember where it was posted.
tazdevl35 said:Hello George,
Let me see if i can clear up some of this confusion....first , the cats are gone correct? You will need to put the O2 sensor eliminators in place of the O2 sensors so the computer will see the correct values...that is to say the ones it would normaly see if the cats were in place.
Taz :t :t
Second... you have headers on the car now and have eliminated the stock manifolds with the AIR tubes that go to the AIR pump ....this is fine as long as the pump solenoid is disconnected the pump wont dump air out of the tubes that went to the manifolds...however, I would remove the pump as well and use a shorter belt..the pump is drag on you accessories and if its taking 2-4 horsepower to run it ,
As far as mileage goes the O2 eliminators will help with this but keep in mind without "live sensors" in place the mileage will never be as good as it could be because the computer cant fine tune the mixture.But it will be better with the eliminators in place.
As far as the ASR system....asr retards timing and backs the throttle off for slip regulation....you could have removed or bypassed something necessary to the proper operation of the ASR system. With out actually seeing what you have there i cant offer any help in that area. Once you have done all these things, clear any codes and start over. You will need to reprogram you computer with someting besides hypercrap. I have used their products and they didnt "blow my skirt up" so I would have a custom program designed and flashed into your PCM. This is the best and only way to get the best performance out of the mods you are doing.I always recommend to everyone to do mods that are emissions legal, high flow cats, emissions friendly cams,etc. This makes life so much easier...or better yet install a better exhaust and a supercharger kit....you still get reliability, mileage and a kick a$$ power increase. I know its more expensive but I prefer the tried and true methods that work with the on board systems.
Tony,oldace84 said:What will happen to your smog checks, and our air?
Just a simple question.
HP is easy to find.