Hi, I bought a Injen Cai for my SS/SC cobalt and after installed my CAI, I remarked that my boost is higher than before I had my CAI. With the car stock my boost was 85Kpa on my canadian gauge and now is 100Kpa. What is the problem? Anybody get the same problem?
Is it dangerous to run with this extra boost ? Maybe my gauge is broken?


Sorry for my english, I'm still a french canadian guy .



Thank you

 

thats normal, every thing should be ok. more boost means more power man

 

more power = more good

 

mine boosted .5 psi more and got there faster once the intake was on

 

Wow. That's about a 2 psi increase. I know giving the intake air an easier pathway will allow more air to be fed into the S/C rotors, but that is quite the jump.

 

It's why I ask the question, 2 psi with a intake it's a lot. The stock boost on a canadian gauge in Kpa is what? I hope that my gauge is not broken.

Is it dangerous to be too lean? Because in the stage 2 you've have bigger injector to accept the higher boost.


Thank you

 

85 KPA = 12.33 PSI. = roughly stock
100 KPA = 14.5 PSI = helluva jump for an intake.

Yes it is dangerous to be lean.

 

It's what I think. Is it a way to take my supercharger pressure without the gauge. I want to know if my gauge is broken.



Because I don't think I get 2psi jump with just my intake.

It's very weird....

 

That is SO not true man. More efficient boost means more power. If the amount of boost you add only gets added with more heat, you generally are better off where you were. And putting an intake on wouldn't neccessarily make more boost. If anything you should see less unless what you are seeing in the blower breaking in from more mileage. When you open up the airflow and thus the veloctiy you will generally see less pressure. More pressure doesn't need as much velocity. Simple dynamics. Like water in a pipe or charge in a wire.

 

intake = more psi generated

exhaust = less psi generated

 

Not the same concept. Freeing up the area before the Eaton should increase boost.

To the original poster, it is a good idea to get a custom dyno tune once you change the stock air intake out. You don't want to be too lean.

 

I'm the only one who have this thing happen. Is it possible to tune without a Dyno, because I'm in north of a Quebec and the nearest dyno is in Quebec City at 5hours.

 

If you get HP Tuners, you can get some advice from Rob (Fast06SS) and do it yourself going by your 02's. So yes, it is possible, but you'll need HP Tuners.

 

yes, u just do wide open throatle runs on the street

 

everyone who has added an itack increased there boost. it's completely normal.
the larger intake is able to draw more air with less effort, hence that effort is transfered into compressing that extra air. therefor more air is forced into the intake manifold = more boost.

your OK, but a tune is always a good option. but I'd say hold off until you have more mods so that you can justify the cost of a custom tune

 

I wouldn't worry about it too much. Keep an eye on it and ears open for strange noises.
If the cars runs well and goes good when you put your foot into the carpet then don't worry till there's something to worry about.

 

The car goes really well, a lot of power and no hesitation. I wait for the winter ( yes in quebec, especially in the north we have a lot of snow) and after I will buy the stage 2.

Thank you for your answers.

 

so now we dont need smaller pulleys, we can just get an intake for more lbs of boost

 

Haha. No man, you still need a smaller pulley.

 

If you want an accurate boost/vac reading buy a mechanical boost/vac guage. I did and now I can see some of the odd stuff the computer does that it doesn't show through the stock gauge.

 

Like what?

 

It's really hard to make any conclusion without more info. Like your AFR, maf readings, SCIP.

 

How can I have this information?

 

The last ~500 RPM before redline the boost starts to rapidly jump from ~8-10 psi.

 

Bingo. I agree.

But I will say I don't know how harmful the boost increase is per heat.