so the intake I ordered came today, and got installed. and... I'm fairly impressed with it. I can definitely notice a better throttle response, and I love the sound it makes at the high rpms. I feel like a kid on Christmas. haha.


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When you get PE delay turned off it's a huge difference in throttle response.

 

What's the pe delay and how will you get it removed I'm guessing by tune right

 

wondering the same. never heard of PE delay before


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I would like to know what it is so I can remove mine lol

 

power enrichment delay. stock it delays until a certain rpm i believe

 

oh boo. sounds stupid. -.-


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So you have to get a tune to remove it

 

PE Delay really has nothing to do with throttle response in the 2.2L. It's the throttle opening rate. Stock opening rate is 1-8% ramp rate. I've got my opening rate 100% and PE Delay still on and I can spin the tires in place with no brake. Impossible with the stock opening rate.

 

oh ok, still need a tune to change it I'm assuming


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Yep, but hopefully your tuner when you eventually get one will already know about all that.

 

What is the PE delay RPM and enrichment rate stock? Some of the GM trucks had a 4800 RPM PE delay which caused huge power losses at WOT below 4800.

 

 

that seems a bit high, I don't even reach 8k.. well its not like I could even if I wanted too.


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Interesting, I had always understood PE Delay as being a time thing, ex: .XX sec after WOT, the car actually pulls the TB open to WOT. I know my 2.2 felt laggy as hell before tune, after with PE delay gone and a few other adjustments the pedal felt like it was actually attached to the butterfly.

 

PE is simply adding more fuel to the engine, nothing to do with the throttle body. That's where the opening rate comes in. Stock, it only opens at a rate of 8%. That's not the max it can open, but rather the rate at which it opens. I have my PE Delay set to 5000rpm, but I'm getting KR at 80mph WOT at 4200-4800rpm. I'm tempted to lower it to 3000-3500rpm. Did you do your own tune or did someone else do it? If you have HPT it'd be worth taking a gander at the opening rate table.

 

No, this was on my 06 2.2, Vince at Trifecta did mine at a buddy's garage nearby.

 

Fair enough, HP can't tune those haha. But chances are high that he modded those tables and that's why it got better throttle response.

 

That would make it seem that the car never enters PE unless you reach 8000 RPMs. Strange.

 

I have two valuable, interesting bits of info to post here. First is a vid I found in another thread and section of this forum. It's a vid of a Trailblazer throttle body with and without a tune for the throttle opening rate. The opening rate is even higher on the Trailblazer than the Cobalt 2.2/2.4 by a good bit, if the info from the vid is correct.


My other bit of info is this: I set my PE delay to 3000rpm and noticed something interesting. While datalogging before messing with the PE, I noticed a considerable KR at .46-.54G/Sec and 3600-4800RPM at various speeds. Around 80mph WOT in 3rd gear, I noticed 4* of knock for several seconds. After setting the PE delay to 3000rpm, I experience no KR whatsoever on a 0-110mph run at WOT, except for maybe .5* KR when shifting into third.

 

ill be honest, I have no idea what you guys mean by KR..


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Knock Retard.

 

ahh. ok.


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wrong my buddy can burn out in his g5 like nobodys buisness WITH NO BRAKE