K&N drop in filter HP increase?
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Joined: Nov 2002
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From: Oklahoma City
QUOTE]Originally posted by Moroccan_Mole
i gained a little over 7hp to the wheels with a k&n filter.[/QUOTE]
w/ a Z??? Could you give us more details.
i gained a little over 7hp to the wheels with a k&n filter.[/QUOTE]
w/ a Z??? Could you give us more details.
Last edited by zogan; Jan 19, 2003 at 03:21 PM.
yes with a z.
not much to tell really.
first run on the dyno was bone stock. after the first run, i swapped in howard's (apexi350z) k&n filter.
the bottom graph is air/fuel mixture.
both runs were done with the vdc on, i forgot to tell the tech to turn it off
that might have made a difference on the numbers ... im not really sure though.
not much to tell really.
first run on the dyno was bone stock. after the first run, i swapped in howard's (apexi350z) k&n filter.
the bottom graph is air/fuel mixture.
both runs were done with the vdc on, i forgot to tell the tech to turn it off
that might have made a difference on the numbers ... im not really sure though.
seems funky, K&N shouldnt gain hp, its not a performance filter, its a replacment filter that can be cleaned. gains are minimal, to be honest, K&N doesnt have any incredable knowledge in their filter that everyone else doesnt know about.
Id have to assume there was some other factor playing a part in that graph.
Id have to assume there was some other factor playing a part in that graph.
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From: Frisco, TX
Originally posted by ares
seems funky, K&N shouldnt gain hp, its not a performance filter, its a replacment filter that can be cleaned. gains are minimal, to be honest, K&N doesnt have any incredable knowledge in their filter that everyone else doesnt know about.
seems funky, K&N shouldnt gain hp, its not a performance filter, its a replacment filter that can be cleaned. gains are minimal, to be honest, K&N doesnt have any incredable knowledge in their filter that everyone else doesnt know about.
Michael.
cause they arent THAT much better, maybe 1hp, but still. never 7hp better. if it is, then its a first, no other cars have I seen that gained more than 4hp. and the 4hp was on a dodge ram with a 5.9liter engine, THAT needed all the air it could get.
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From: Long Island, NY
I wouldn't use a K&N filter because the gains are negligible and there is a potential risk that the oil from the filter could contaminate the mass air meter wire.
Nismo has released a higher flow paper filter available at:
http://www.prospec-ms.co.uk/merchandise/nismo_350z.html
Nismo has released a higher flow paper filter available at:
http://www.prospec-ms.co.uk/merchandise/nismo_350z.html
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From: Oklahoma City
Originally posted by Moroccan_Mole
shrug, runs were done back to back.
no other changes.
shrug, runs were done back to back.
no other changes.
I was there when Moroccan_Mole dyno'd his car and can vouch for what he said. My car, with no mods except the grounding kit, dynoed at 235hp (attached to this message) on the same dyno on the same day.
The only thing I can't figure out is we keep hearing that you have to let the ECU learn the new mod by driving aroung for a while, which was not done here. I know little about dyno's and fuel mapping, but I expected the fuel mapping graph to change with the second run since the ECU did not have time to adjust.
I think we could of come to a better conclusion if apexi350z could of dynoed his car that day also since he has had the filter on for quiet some time. The reason apexi350z did not dyno is this was a pre-register dyno day and apexi350z had not signed up for it.
The only thing I can't figure out is we keep hearing that you have to let the ECU learn the new mod by driving aroung for a while, which was not done here. I know little about dyno's and fuel mapping, but I expected the fuel mapping graph to change with the second run since the ECU did not have time to adjust.
I think we could of come to a better conclusion if apexi350z could of dynoed his car that day also since he has had the filter on for quiet some time. The reason apexi350z did not dyno is this was a pre-register dyno day and apexi350z had not signed up for it.
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From: Oklahoma City
Originally posted by sands
The only thing I can't figure out is we keep hearing that you have to let the ECU learn the new mod by driving aroung for a while, which was not done here. I know little about dyno's and fuel mapping, but I expected the fuel mapping graph to change with the second run since the ECU did not have time to adjust.
The only thing I can't figure out is we keep hearing that you have to let the ECU learn the new mod by driving aroung for a while, which was not done here. I know little about dyno's and fuel mapping, but I expected the fuel mapping graph to change with the second run since the ECU did not have time to adjust.
Originally posted by zogan
Question: Do you think if the ECU was reseted, it would result in under a 7HP gain?? If yes, why would it be a lower gain, once the ECU adapted?? I am asking b/c I don't know, not b/c I don't beleive you.
Question: Do you think if the ECU was reseted, it would result in under a 7HP gain?? If yes, why would it be a lower gain, once the ECU adapted?? I am asking b/c I don't know, not b/c I don't beleive you.
When I dynoed my car, there was a similar difference between the first and subsequent runs with NO mods between runs. The mech, who works a lot with Nissans, said that the VQ is very sensitive to coolent temperature variations. It likes warm coolent and will adjust setting based on coolent temp. This could easily account for the HP increase.
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From: KC MO
Originally posted by Alang
When I dynoed my car, there was a similar difference between the first and subsequent runs with NO mods between runs. The mech, who works a lot with Nissans, said that the VQ is very sensitive to coolent temperature variations. It likes warm coolent and will adjust setting based on coolent temp. This could easily account for the HP increase.
When I dynoed my car, there was a similar difference between the first and subsequent runs with NO mods between runs. The mech, who works a lot with Nissans, said that the VQ is very sensitive to coolent temperature variations. It likes warm coolent and will adjust setting based on coolent temp. This could easily account for the HP increase.
Dan
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From: Oklahoma City
Originally posted by McDan
I was gonna say the same thing. My car dyno'd 229 on the first run, then 236 on the second run after it sat a while, no modifications on either run. ONE RUN PER MOD IS NOT A GOOD ENOUGH WAY TO SHOW A GAIN! You need to do 3 runs one way, then 3 runs with the mod with nothing else changed. I could say I picked up 7 rwhp by turning the radio off on the second run, but would that be accurate?
Dan
I was gonna say the same thing. My car dyno'd 229 on the first run, then 236 on the second run after it sat a while, no modifications on either run. ONE RUN PER MOD IS NOT A GOOD ENOUGH WAY TO SHOW A GAIN! You need to do 3 runs one way, then 3 runs with the mod with nothing else changed. I could say I picked up 7 rwhp by turning the radio off on the second run, but would that be accurate?
Dan
