For all of you guys that are running OTTP's 3" raw intake on a stock throttle body and stock supercharger. I was just wondering if it is possible to do this safely? I'm planing on doing the stg.3 with TVS, but would like to get some of the parts right now... Will it blow codes?, will I run lean(er)? I am currently on GM stg.2

- Also can I order the intake with the meth bung and just plug it until I get a meth kit?
Thanks

 

You might throw a lean code (P0171), but drive around for a while and it will go away once your fuel trims learn it out. You'll definitely want to get a tune, but if you're going TVS soon you'll be fine in the mean time.

Yes you can just plug the meth bung.

 

Their intake is not from raw,they make it themselves.

 

^^ what he said

 

Okay cool! I figured that it would run a little bit lean(er) but I am stage 2 right now, so it isn't going to hurt my car being it is running 10:1... hopefully? right? Do you guys that have it say it is worth it? I have Injen right now! let me know?

 

Anything leaner than 10:1 is a good thing. lol

I dont have one but I've installed one. Super easy compared to the RAW and you dont have to bend any brake lines. I'm sure you'll be happy with it.

 

RAW intake fits terrible.. Just sayin

 

The raw that I had fit really well...didnt need to bend brake lines or anything...on and 07 at that.

 

Mine rubs the ECM.. and the radiator support.. and the inner fender..lol

 

I agree with you. When I had the RAW intake it fit so tight that it didnt even move. It rubbed the PCM, front radiator support, and worst of all I had to bend the brake lines (07').

 

same issues with mine, but i got it for a $100 from a member

 

So any problems with fitting OTTP's 3"? Do you need to bend the brake lines or does it bulge the fender?

 

The OTTP fits like a freakin glove. Seriously. I support them as a vendor and all but it really does fit very well.

 

Alrighty! sounds good! So just to double check I can run this without any problems on a stg.2 tune?

 

Yes I think theres a ~60% chance you'll throw a lean code, but simply driving around enough will make it go away. Go for it, you'll be fine.

 

Cool dude! That is what I want to hear! One more question... How long would I be able to run with the 3" without a tune?

 

As long as you want once the fuel trims learn themselves. It just wont be optimized without a tune, and the lean code could come back every now and then as weather changes.

 

OKay well that isn't bad at all! So you figure the fuel trims will work themselves out? how does that happen?

 

Your fuel trims are a representation of your cars oxygen sensors constantly monitoring how much air and fuel flows through your engine. If too much fuel is detected in the mix, the computer will adjust so that less fuel is added. If too much air is detected, more fuel will be added.

This adding and subtracting of fuel is generally known as your fuel trim. You have two types of fuel trims, both work hand in hand. They are your long term fuel trims (LTFT), and short term fuel trims (STFT).

Long term fuel trims adjust very slowly. They are essentially an average of your short term fuel trims over time, which adjust very quickly and are a good representation of what is going on "right now". If your short term fuel trims are persistently positive, your long term fuel trims will slowly climb into the positive, same for negative. Your short term trims should ideally swing from just a little rich to just a little lean, averaging out your long term trims to zero. This means your engine is perfectly mixing the air and fuel flowing through the engine. This is also known as running stoich.

If your car detects that it is compensating more than 20% in either direction, it will turn on the malfunction indicator lamp (CEL) and throw either a rich (p0172) or lean (p0171) code.

In the case of this intake, you'd throw a lean code because more air than the computer is calibrated for will be flowing through the engine, due to the larger diameter intake. More air than fuel = lean.

After a while though, the initial "shock" of ultra-positive short term fuel trims will wear off and your long term trims will settle back down. They will likely hover just below the point of throwing a CEL.

The way to compensate for this is to have your tuner adjust your MAF and VE (most tuners only adjust your MAF) so that your engine knows exactly how much air to expect based on the higher flow your intake offers.

Hope that answers your question. :P

 

Haha thank you! That make perfect sense and makes me feel a lot better about getting a 3" intake! By the sounds of it you know a thing or two about tuning? A lean code isn't going to put my car into limp mode or restrict power will it?

 

Nah, you wont pass emissions, but it'll run fine.

 

Pft. we don't have emission in Alberta

 

Didn't throw any codes when i installed mine.

Worked like a charm and fit beautifully!

 

777 I read through you long post one more time and was wondering... does it throw a code when the short term deviates +/- 20% from the long term fuel trim? is that how it works?

 

Nope there is no code for the short term, only the long term, and the code sets relative to zero (not LTFT + STFT).

So if the LTFT is +2% and STFT is +18%, LTFT will only ever climb up to 18% (at that point STFT would be 0%).

Good to know Cyborg! The guy I installed one on got a code right away, so I guess mileage varies. He was a bone stock '07 btw.