Thread: K&N Air Intake Horsepower

So I e-mailed K&N to ask about their intake for my 2004 Grand Prix GTP Competition Group. I'm just gonna copy the e-mails sent and you guys tell me what you think.

I'm wondering if K&N has any dyno results for the 2004/2005 Pontiac Grand Prix GTP or the upgraded "Competition Group". Both have a 3.8L V6 with a supercharger, but I believe the Competition Group is tuned differently. I've seen the results for the normally aspirated engine, but I'm wondering if you have any results for the supercharged engine.
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Thanks for contacting K&N. The K&N air intake system for the 04 Grand Prix GTP SC is part number 57-3049. The dyno testing was performed on a 2004 Grand Prix GTP with 3.8L Supercharged engine. The kit increased the horsepower by 16.78 to the wheels. Please take a look at the product information on our website for the air intake system. Here is the link, http://www.knfilters.com/search/product.aspx?Prod=57-3049.
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From what I know about the Grand Prix, the dyno testing couldn't have been done on a supercharged 3.8L. The 3.8L V6 with a supercharger puts out around 260HP. Your test shows original HP at 197.77 which would closely match the 200HP rated out of the non-supercharged 3.8L.. What I'm saying is I believe your dyno testing was on a 2004 Grand Prix either Standard Sedan or GT, which both put out a rated 200HP, where as the GTP or GTP Competition Group both put out a rated 260HP.
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After checking with our engineering dept, the dyno testing was in fact performed on the supercharged model. The engine output is measured at the wheels so it could be 20-25% less than the crank horsepower due to driveline loss.

So those are the e-mails I sent in Red and the responses from K&N in blue. I don't see how they can say the difference between rated HP and actual HP was 62.23 HP. I mean, yeah, there is gonna be a HP difference, but that means they are saying that my car that has a rated 260 HP really only has 197.77 HP, and then with the K&N Air Intake only 214.55 HP. So would that mean that the 200 HP engine really only has around 140 HP at the wheels? I find that hard to believe.

So i guess my next question is, has anyone independently got a Dyno done for a stock GTP or a lightly modded GTP with things like an Air Intake or replaced Spark Plugs & Wires.

you dont know anything about drivetrain loss, do ya?

also, the K&N is overpriced and will net you a whole 2 hp.

saying 17 hp to the wheels would be about 23 to the crank? (just a guess) s that means about 283 to the crank. after converting to wheel hp the loss is almost 85 hp? i smell lies

Originally Posted by Bio248

you dont know anything about drivetrain loss, do ya?

also, the K&N is overpriced and will net you a whole 2 hp.

No I don't know anything, hence why I'm asking. So don't crack on people that don't know so much about cars ok? How about you please try to be useful and tell me something I don't know instead of cracking jokes.

And i like my K&N sure it cost a bit of money, but it looks good and works good.

the car makes only about 80% of the crank horsepower at the wheels. with wear and tear on the motor and transmission it goes down considerably.

the intake will not net you 15+ hp. it will net you 5 if you are ungodly lucky.

ACtually there math is right. If there intake did net 17 hp to the wheels after dyno'd you would see about 200 to the wheels

Eh, only thing I know for a fact is that intake aint gettin anyone 17hp to the wheels.

Originally Posted by Bio248

the car makes only about 80% of the crank horsepower at the wheels. with wear and tear on the motor and transmission it goes down considerably.

the intake will not net you 15+ hp. it will net you 5 if you are ungodly lucky.

well bio i guess zzp's dyno read wrong when i pulled 193 whp then pulled 204whp after my k&n intake on my 03 gtp?? i think not... you can make 5whp just from gutting the stock airbox and throwing in a drop in k&n so idk where you get your facts from..its not opinions that matter around here its no.'s and you dont have a clue...NOW is the intake overpriced? sure is. are their better intakes for our cars? yes but k&n makes power..so there ya go...

LOL if you think that just a K&N drop in with a gutted airbox netted you 9 WHEEL HORSEPOWER. You probably had a really crappy clogged up filter to begin with.

As for the K&N...for the money...its junk. You can take it off and make your own and make MORE power...for more than half the price. I'd tell you a WAY better way to make power for $300 or so...its called methanol injection, a tune, and a smaller pulley...I bet you'd get 25 WHEEL Horsepower. Stick that in K&N or ZZP's pipe and smoke it.

Over on 3800pro Brian turner from dyno tune motorsports dynoed a stock gtp cant remember what year but it was 97-03 and made like 210 to the wheels i think it was (dynojet). Anyways is that rating from k&n peak hp or was that across the powerband? i do find it hard to believe it was peak hp.

Originally Posted by bluegtp91

LOL if you think that just a K&N drop in with a gutted airbox netted you 9 WHEEL HORSEPOWER. You probably had a really crappy clogged up filter to begin with.

As for the K&N...for the money...its junk. You can take it off and make your own and make MORE power...for more than half the price. I'd tell you a WAY better way to make power for $300 or so...its called methanol injection, a tune, and a smaller pulley...I bet you'd get 25 WHEEL Horsepower. Stick that in K&N or ZZP's pipe and smoke it.

where the hell did i say a gutted airbox w/ k&n netted me 9 w hp smartguy??

Look who cares. How long u been workin on ur car? Prob not nearly as long as bio OR blue. They know. That's all there is to it. Can't listen to everything u read on the internet. I don't even think doin rockers or meth injection would give u 25whp. And as far as americanslodiers claim,that's what it is. YOU claim u got these numbers. I don't believe it. U got proof? And if u do, then ur car is a freak. Stupid conversation. Why get on here to ask questions and then get pissy with the guys that actually know what their doin?

hey superv6 i can give 2 ****s on how long anyone here as worked on a 3800. ive spent over 2 years of my life in iraq getting shot at, blown up, and seeing my lil girls grow up without me..so i appoligize im never home to work on this motor and become a "guru" all i know is i dynod and made the power posted..and thats ALL the man wanted to know..how much the expensive ass intake makes powerwise..ive spent the last 4 years fighting in real life, and im not about to fight onnline so im done..i go back in 17 days annd dont have time for this

K&N > stock but too expensive end of story

I have had K&N on a few of my cars there products are decent quality and yes over priced there hp gains are a little outrageous but its a marketing ploy
I don't understand the attitude some folks have on here simple ?'s should get simple answers
And american don't let it get under your skin Gotta respect anyone willing to fight for there country

Originally Posted by AmericanSoldier

hey superv6 i can give 2 ****s on how long anyone here as worked on a 3800. ive spent over 2 years of my life in iraq getting shot at, blown up, and seeing my lil girls grow up without me..so i appoligize im never home to work on this motor and become a "guru" all i know is i dynod and made the power posted..and thats ALL the man wanted to know..how much the expensive ass intake makes powerwise..ive spent the last 4 years fighting in real life, and im not about to fight onnline so im done..i go back in 17 days annd dont have time for this

K&N > stock but too expensive end of story

don't worry about him. It's very possible that there intake can give about 14 whp.

Originally Posted by rocafella2032

don't worry about him. It's very possible that there intake can give about 14 whp.

No offense or anything but, you shouldn't talk about what you don't know.

Originally Posted by rocafella2032

don't worry about him. It's very possible that there intake can give about 14 whp.

doubtful. an intake doesnt do that much. the biggest restriction is in the corrugated tubing they use. take that out and you have a pretty free flowing intake. if someone were to mock up a "hybrid" with a nice mandrel bent pipe into the stock air box i bet it would work wonders. however, stock air box means you wont get the whine like people want.

the fact of the matter is that an intake alone does not give a generous power gain.

when you do there math it adds up...