hi: I HAVE A 2006 SS/SC MY CAR IS ALMOST STOCK I ONLY HAVE ON IT A INTAKE, AND THE CAR WAS WORKING FINE. THE OTHER DAY I DECIDE TO PURCHASE THE DOWN PIPE, SO I DECIDE TO DO AND I PURCHASE ONE '3" WITHOUT CAT FROM ZZP. WHEN I INSTALLED THE PIPE MY SUPERCHARGER IS NOT BOOSTING. SOMETIMES THE NEEDLE OF THE GAUCE GIVES A LITTLE JUMP. I THOUGHT THAT I BROKE SOMETHING IN THE INSTALATION, THEN I PUT BACK MY STOCKPIPE WITH CAT AND I HAVE MY 12 PSI OF BOOST BACK. ALSO IM PLANNIG ON PUTING AN O2 SIMULATOR IF GET THE CHECK ENGINE FOR THE 2 O2 IF NOT WILL NOT PUT THE SIMULATOR. ANY SUGGESTION. THANKS IN ADAVANCE

 

Now that just doesn't make any sense to me. Are you SURE you didn't touch anything else when doing the install? And you can't use o2 sims for our cars.

 

how does a downpipe cause a motor not to produce boost. when it is a load sensative belt driven deal that is not, or cares not about exhaust?
im lost.

 

WHY I CANT USE A SIMULATOR IF IS FOR THE SECOND SENSOR IT WILL SAY THAT THE CAT IS ON. THANKS IN ADVANCE.

 

Same question i ask myself. My flex pipe on my DP is split so now im boosting 6 psi. I think it is because of the O2 sensor that is going crazy hence the lost of boost....??

 

I HAVE ONE QUESTION MAYBE WITH THE NEW DOWNPIPE ITS MAKING THE ENGINE THIRSTY OF AIR, MAYBE THE ENGINE AND CHARGER ARE NOT PRODUCIONG ENOUGH AIR FOR THE DOWNPIPE JUST GUESSING. THANKS.

 

maybe it needs a tuned

 

um, please stop typing in caps.

granted it is going to lower boost levels, which is not a bad thing. it should not. and will not kill all the boost. unless you threw the car into limp mode.

you can not run an 02 simulator on anything newer then 04

 

You mean the o2 is making the ecu to reduce boost

 

if the ecm is put into limp mode. yes.

 

how do i know that if its limp mode cause, the car does not says engine power reduce.

 

I would imagine that the o2 sensor Hz is so high that the ecm thinks that it is running lean, therefore disabling boost to prevent an even leaner condition.

 

hi have an o2 simulator with the heater resistance in another 2007 scion and no problem.
why i cant use it, in a 2004 up still obd 2

 

The second O2 cannot cause a reduced power mode, its strictly for emissions. It just throws a cat performance code, nothing more. The car only watches for lean/rich on the first O2, it looks at the second to make sure that its seeing a leaner mix than O2 #1, which means the cat is working. I drove my car for 3 days without the cat before using HPT on it to disable the CEL, and it took 2 days for the car to even realize that the cat was gone, and it did not affect the performance in any way when the light did turn on.

 

Then my rpoble is the downpipe can this downpipe without cat be used on a car with no modification to the supercharger, no more boost than stock.

 

The problem I'm understanding with the o2 sim on these cars is that these pcm's are smarter then earlier ones and when you use something like a sim which gives a static non changing # (resistors to reduce the voltage signal to the "right" voltage) it realizes it and sets off the code. The downpipe can't free up the exhaust that much to drop all boost. I just don't see it happening that way. It's also true that the 2nd o2 sensor is just there for the cat and nothing to do with afr. Maybe your car saw something like it's running too lean like suggested and cutting back boost. I would think that if you left the o2 disconnected it would actually read infinite resistance. Since the higher the voltage (less resistance) the richer then with infinite it could possibly set it into limp mode and cut all boost. I'm going to suggest you do the boost bypass mod BUT ONLY AS A DIAGNOSTIC TOOL. Never keep the car like that, just do it and see if the boost goes back up. If it does than you have to figure out why your car wants to open it. It's a step in the right direction. Good luck!

 

how do i the boost bypass mod?

thanks ill search for it.