ok so on Friday I installed my injen cold air intake and I could defiantly feel her pull allot harder then on Sunday I installed my dc header and she felt like she lost power and then on the way home from work my check engine light came on so I got it checked out and it was PO420 (I was like cool to) but any way it said caytlest system performing below thresh-hold bank 1 so in lamest terms to low back pressure in my header (bank 1)

Any one know any ways around this cause that stupid thing was $245 I would hate to have to take it off and let it site

 

some have used an anti-fowler to space out the 2nd o2 sensor, others have used an o2 simulator. I tried both on my cousin's tC with no luck.

 

The MMW / Weapon -r CEL fix works. you can buy it seperatly insteed of buying there header. good luck

 

The MMW / Weapon -r CEL fix works. you can buy it seperatly insteed of buying there header. good luck

 

The MMW / Weapon -r CEL fix works. you can buy it seperatly insteed of buying there header. good luck

 

That was a hardcore triple post!

 

thats why im keepin stock headers.
My car is plenty loud enough, plus i need no more performance unless its exterior.

 

First, a CAI provides MAYBE 2 hp if you are lucky, you were tricked by the butt dyno, the CAI did not provide any noticeable gains.

The code does not mean there is too little backpressure, the second O2 is not reading a lower concentration than the first O2 because the header doesnt have the pre-cat. The second O2 measures this to determine when the first cat is shot. You need an antifouler to pull the second one out of the flow a bit, hence tricking it into thinking there is a cat in between doing its job. That works for many, but not for all. Niether does the MMW fix. from what I hear.

I would also expect very little gain on the header. A header and exhaust on this car should yield a little bit of a noticeable gain, but the header alone will not be what you are expecting.

 

Ok so the CEL was the 2nd O2 saying something is ____ed up in the first bank. (2nd O2 was reading too much ____ coming thru) so I need to pull out t the second one so it don’t read as much ____. ok that make sense for the CEL but why did I get a power loss (im new to the tuning up a EFI system ask me about a old school vw and ill tell you how to make a10sec car but this new ____ im still learning)

 

did someone say old school vw?

 

yup yup dont have a vw any more but still have a half built 1914 in my room

 

like my good friend lance always says, "Most performance mods need a watch and timed course to demonstrate actual improvement. Few deliver the advertised claims. Many are actually worse than stock. The best performance mods are made to the driver."

 

Buy 2 HELP! (brand) Spark Plut Non-Foulers (Model # 42002), then bore 1 out with a 1/2" bit. Unscrew your secondary O2 sensor in the S-Pipe, thread the O2 sensor into the bored out non-fouler, then thread the other spark plug non-fouler that HAS NOT been bored out over the top of that one, then thread back into S-Pipe. Viola, no CEL


Search "Anti-Fouler"

 

https://www.scionlife.com/forums/viewtopic.php?t=56520

 

ok so that will turn off my check engine light but will that fix the power loss

 

Ahhhh. A 7068 mile tC. Those were the days.

 

i also installed injen cai and dc header
used antifouler mod and no cel (drove it about 100mi so far)
props to kaeon
and for the power loss... i didnt notice it
just friggin raspy
gotta get an exhaust asap (megan maybe?)

 

So let me get this straight.......You gained maybe 4-5fwhp at the most and you say you "could definitely feel it pull harder".

You will not feel that power, that is just from the sound.

Think of it this way. Your car stock will run about 15.8, add a intake and just say for ____s and giggles you actually gain 0.1 on your ET. Thats 1/10th of a second ahead of a stock tC. Would you really notice that?

 

An exhaust is going to make it even worse. You need a resonator:


http://www.dezod.com/cat_resonators.cfm

 

yes i could feel it pull much harder you should install one and see for you self.