C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Nov 9, 2006 | 10:22 PM
  #1  
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Default Free 15+ HP

Clean your K&N Filter
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(This PSA brought to you by the dumbass that didnt do it for 2+ years and was wondering why it was running like chit. Thought everyone could use a reminder)
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Old Nov 10, 2006 | 09:19 AM
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Also, clean your MAF. Sometimes K&N oil cooks all over the wire. Do not overoil your filter. I posted this in another thread, but thought it was interesting enough to repeat. Sorry if you read it already.

I tried the new CRC MAF cleaner and cleaned my volvo and vettte mafs. The vette's is only 4 yrs old and wasn't too bad, but the volvo's was terrible (130,000 miles). It looked clean so I didn't think it would help, but when I sprayed it off over a clean rag much black came off. I don't know if it helped, but I'm sure it must have. I have been getting better mileage lately, so maybe that is why. Maybe it is from not driving around at full boost (turbo) all the time too. It says on the can that cleaning your maf adds horspower and mileage if it is dirty.

Dave
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Old Nov 10, 2006 | 09:45 AM
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For those that don't know the K&N filter does not add any HP over paper, I subscribe to vette mag. and they dyno tested I think a 92 with and without an K&N and was no difference in numbers. They sugested to just replace your paper filter more offten instead of letting the K&N get dirty and cleaning it. Of corse this issue came out right after I bought an K&N filter but you'll have that. but yes anyway if your filter is dirty it help a lot to clean it to get some air in.
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Old Nov 10, 2006 | 09:55 AM
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My car came with a K&N and im keeping it.
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Old Nov 10, 2006 | 11:26 AM
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Originally Posted by black85
Also, clean your MAF. Sometimes K&N oil cooks all over the wire. Do not overoil your filter. I posted this in another thread, but thought it was interesting enough to repeat. Sorry if you read it already.

I tried the new CRC MAF cleaner and cleaned my volvo and vettte mafs. The vette's is only 4 yrs old and wasn't too bad, but the volvo's was terrible (130,000 miles). It looked clean so I didn't think it would help, but when I sprayed it off over a clean rag much black came off. I don't know if it helped, but I'm sure it must have. I have been getting better mileage lately, so maybe that is why. Maybe it is from not driving around at full boost (turbo) all the time too. It says on the can that cleaning your maf adds horspower and mileage if it is dirty.

Dave
Never cleaned the MAF, gonna look into cleaning it
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Old Nov 10, 2006 | 11:32 AM
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Im one to always pick labor over money, so I'll stick with my K&N and clean it rather than buy a new paper filter.
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Old Nov 10, 2006 | 11:47 AM
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Like a dumbazz, I recently did a dyno run with a dirty air filter. I Realized it after the fact and did a rerun after replacing it. I picked up 11 RWHP.
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Old Nov 10, 2006 | 01:33 PM
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Did mine last weekend. Wasn't really dirty, but it was dirty enough to make me glad I cleaned it.
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Old Nov 10, 2006 | 02:12 PM
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Originally Posted by GR879SHARK
For those that don't know the K&N filter does not add any HP over paper, I subscribe to vette mag. and they dyno tested I think a 92 with and without an K&N and was no difference in numbers. They sugested to just replace your paper filter more offten instead of letting the K&N get dirty and cleaning it. Of corse this issue came out right after I bought an K&N filter but you'll have that. but yes anyway if your filter is dirty it help a lot to clean it to get some air in.

theres a million other mags than a vette mag. Formula 1 and every form of racing uses a low restriction filter. A K&N does work. The surface area of a stock c4 filter may be large enough for a low revving L98, but there is restriction on a Lt1/4/5 and LSx + motors.
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Old Nov 10, 2006 | 02:14 PM
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Originally Posted by DieL
theres a million other mags than a vette mag. Formula 1 and every form of racing uses a low restriction filter. A K&N does work. The surface area of a stock c4 filter may be large enough for a low revving L98, but there is restriction on a Lt1/4/5 and LSx + motors.


Especially modified engines. More mods = need more air
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Old Nov 10, 2006 | 04:29 PM
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For all you KN guys - there was a big test of several air filter aftermarket systems - KN came in at or near the bottom! - Sorry guys - it doesn't add what they claim - no where near it! It was discussed here a few years ago - including a link to the test and result numbersd - don't know if it can still be found by tyhe search function!

So how can they claim the increased HP?

Heres their little secret! KN builds a very hot motor - tuned for their specific airfilter - they get their dyno numbers - then put on a stock filter - and of course that chokes the motor - So they can claim the difference as increased HP. But unless you haver several thousands in your motor - it will not get the advertised gains!

I guess I'll go put on my nomex to deal with all the guys here who have bought into the KN marketing hype!

Carl "Ran laps in a go cart - tied to Jerry Nadeau today!" Johansson
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Old Nov 10, 2006 | 04:30 PM
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and everyone here has a non-hot motor right ?
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Old Nov 10, 2006 | 04:33 PM
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Originally Posted by Carl Johansson
For all you KN guys - there was a big test of several air filter aftermarket systems - KN came in at or near the bottom! - Sorry guys - it doesn't add what they claim - no where near it! It was discussed here a few years ago - including a link to the test and result numbersd - don't know if it can still be found by tyhe search function!

So how can they claim the increased HP?

Heres their little secret! KN builds a very hot motor - tuned for their specific airfilter - they get their dyno numbers - then put on a stock filter - and of course that chokes the motor - So they can claim the difference as increased HP. But unless you haver several thousands in your motor - it will not get the advertised gains!

I guess I'll go put on my nomex to deal with all the guys here who have bought into the KN marketing hype!

Carl "Ran laps in a go cart - tied to Jerry Nadeau today!" Johansson

I didnt start this thread to have a K&N Pissing match. All I wanted to do is remind people to clean their filters if they haven't- thats all

And yes, I have several thousand in my motor and have gotten very good gains from a K&N.

And as stated in my thread title, my filter was so dirty it probably cost me 15+HP (the whole engine was choking). How's that hype???

Last edited by Darkgh0st; Nov 10, 2006 at 04:37 PM.
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Old Nov 10, 2006 | 05:08 PM
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Originally Posted by Darkgh0st
my filter was so dirty it probably cost me 15+HP (the whole engine was choking). How's that hype???
How IS the hype???
You're now saying that this "15hp" was nothing more than a number you picked out of the air?

Sounds a lot like the ads for K&N......

Originally Posted by Carl Johansson
So how can they claim the increased HP?

Heres their little secret! KN builds a very hot motor - tuned for their specific airfilter - they get their dyno numbers - then put on a stock filter - and of course that chokes the motor - So they can claim the difference as increased HP. But unless you haver several thousands in your motor - it will not get the advertised gains!
I'll tell you how they can legally claim what they claim: they take a car with a stock, paper air filter that has 100,000 miles on it, has 1/2" of dust buildup on it, and flows about 5cfh at most. They dyno the engine. Then they replace the clogged stock filter with a fresh K&N and re-test. Bingo! Instant hp!...."Up to 20 additional horsepower!!!" (they never tell you what this 20 hp is more than)
They would get the same results using a fresh, stock paper element.
Read K&N's ads carefully and tell me I'm wrong.


Larry
code5coupe

Last edited by rocco16; Nov 10, 2006 at 05:14 PM.
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Old Nov 10, 2006 | 05:10 PM
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Originally Posted by DieL
and everyone here has a non-hot motor right ?
I wouyld susect that KN with engineers and essentially an unlimitted budget are building motors that are very hot. Their whole advertising claim depends on it!!

I would love to know all the stuff they put in their motors - don't know how to get that info - but I'm guessing it's a few steps up from what most members are building - think 20 - 50 K for a motor! and they don't care if they blow up - they only have to run for 3 minutes 2 times right?

Carl Johansson
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Old Nov 10, 2006 | 05:16 PM
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Originally Posted by Darkgh0st
I didnt start this thread to have a K&N Pissing match. All I wanted to do is remind people to clean their filters if they haven't- thats all

And yes, I have several thousand in my motor and have gotten very good gains from a K&N.

And as stated in my thread title, my filter was so dirty it probably cost me 15+HP (the whole engine was choking). How's that hype???
I wasn't questioning your claim of added HP by cleaning - that much is well known - and a good reminder. I was simply informing those who are interested that KN is not the only system available - and many other brands are demonstratedly better at helping engines perform better.

KN has put themselves in to an enviable market position where anyone looking for more performance immediately thinks KN. I was just making sure that everyone here understands how KN run their tests to maximize their claims - nothing wrong with that - as long as you understand where and how those numbers came about!

Carl " see- I told you I was gunna get flamed by a bunch of KN apologists!" Johansson
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Old Nov 10, 2006 | 05:26 PM
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I for one don't care if it doesn't add HP. I use one, and clean it, because it saves cash.
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Old Nov 10, 2006 | 05:32 PM
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Originally Posted by Carl Johansson
KN has put themselves in to an enviable market position where anyone looking for more performance immediately thinks KN. I was just making sure that everyone here understands how KN run their tests to maximize their claims - nothing wrong with that - as long as you understand where and how those numbers came about!
I agree 100% but you're in the wrong thread. Go start a thread debating K&N Performance tests
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Old Nov 10, 2006 | 05:59 PM
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Originally Posted by Aardwolf
I for one don't care if it doesn't add HP. I use one, and clean it, because it saves cash.
Exactly!

I work in a steel mill, so dust is an everyday hazard of driving to work for me, whether it be in my pickup truck, my Vette, or my SUV...for that reason alone, it's worth it to me that all have cleanable K&N's.
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Old Nov 10, 2006 | 08:37 PM
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How are you suppost to clean these things? I have the open lid one. I have the oil spray but never actually cleaned it. I look at it. it looks O.K , I leave it alone. Its been two yrs now and 10,000 miles.
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