the Official "NA Tuning" thread
Joined: May 2004
Posts: 3,403
Likes: 6
From: DFW, TX
Its actually a Full Race Intake manifold...not ultimate racing, no specs yet. I haven't recieved a call from them yet but I may possibly be doing testing on it on sunday. Not for sure yet, and after we have results I'm sure they will want me to let you guys know about it...here is a thread about it
https://www.s2ki.com/forums/index.ph...pic=336104&hl=
https://www.s2ki.com/forums/index.ph...pic=336104&hl=
Joined: Sep 2004
Posts: 8,106
Likes: 2
From: PNW
Ahhh that piece looks fantastic. What are they doing for ya? Can't wait for results.
Hmm, high compression/cams/I,H,E.... That's right down our alley? If it provides at least a MAX peak hp gain of 8, I'm there. Or 15whp gain anywhere above 6k rpm.
Hmm, high compression/cams/I,H,E.... That's right down our alley? If it provides at least a MAX peak hp gain of 8, I'm there. Or 15whp gain anywhere above 6k rpm.
Member
Joined: Apr 2004
Posts: 33,838
Likes: 23
From: Sunshine Coast - England UK
Quick question,
Im very interested in the J's setup (ECU / Intake / Header etc)
On the ECU part, if you went for a wideband lambda and then tuned the fuelling using a VAFC, would the stock ECU have the capacity to adjust the timing, combined with the above mods? I imagine it would.
Suppose the benefit of the J's ECU is the fuelling and more advanced timing.
Second question, am I right in saying the primary O2 becomes passive on VTEC (open loop) and the MAP sensor totally governs the fuelling, along with fixed fuel maps in the ECU?
I appreciate that on part throttle the ECU uses the lambda etc to give the most efficient means of fuelling.
MB
Im very interested in the J's setup (ECU / Intake / Header etc)
On the ECU part, if you went for a wideband lambda and then tuned the fuelling using a VAFC, would the stock ECU have the capacity to adjust the timing, combined with the above mods? I imagine it would.
Suppose the benefit of the J's ECU is the fuelling and more advanced timing.
Second question, am I right in saying the primary O2 becomes passive on VTEC (open loop) and the MAP sensor totally governs the fuelling, along with fixed fuel maps in the ECU?
I appreciate that on part throttle the ECU uses the lambda etc to give the most efficient means of fuelling.
MB
Joined: May 2004
Posts: 3,403
Likes: 6
From: DFW, TX
I don't think that either a J's or Stock ECU has the capacity to adjust timing. They are loaded with set maps which they run off of. However, I would assume that the J's ECU timing map is more aggressive then stock as well as the fuel tuning.
as per your second question I didn't answer cause I really don't know for sure. I assume you are correct, the map sensor and TPS are probably the primary sensors governing the fuel and timing maps as the WOT maps are set and can't be changed. However, I would also assume that the O2 sensor is also used simply based on changes in ambient air pressure/temperature etc can cause richer/leaner mixtures so it is probably used to some extent to help keep everything in check. But again, I honestly couldn't give you a straight answer for this.
as per your second question I didn't answer cause I really don't know for sure. I assume you are correct, the map sensor and TPS are probably the primary sensors governing the fuel and timing maps as the WOT maps are set and can't be changed. However, I would also assume that the O2 sensor is also used simply based on changes in ambient air pressure/temperature etc can cause richer/leaner mixtures so it is probably used to some extent to help keep everything in check. But again, I honestly couldn't give you a straight answer for this.
Member
Joined: Apr 2004
Posts: 33,838
Likes: 23
From: Sunshine Coast - England UK
Thanks, glad someones listening!
They will both adjust timing based on knock, but I guess they have limited scope to advance timing. If you add more air, and get the exhaust gas flowing out quicker, the ECU is constantly trying to optimise knock levels - but dont know enough about this really.
So my plan of tuning a stock ECU with a VAFC and a wideband would probably not be as good as a J's ECU. Although the mixture could be leaned slightly, the timing may not change so the only gain would be from running a bit leaner. If you add some breathing mods to that too, the J's ECU would be even more suited I guess. Cost would be about the same too.
I know on my Impreza's the lambda isnt used at all on WOT but not sure on Honda's....
MB
They will both adjust timing based on knock, but I guess they have limited scope to advance timing. If you add more air, and get the exhaust gas flowing out quicker, the ECU is constantly trying to optimise knock levels - but dont know enough about this really.
So my plan of tuning a stock ECU with a VAFC and a wideband would probably not be as good as a J's ECU. Although the mixture could be leaned slightly, the timing may not change so the only gain would be from running a bit leaner. If you add some breathing mods to that too, the J's ECU would be even more suited I guess. Cost would be about the same too.
I know on my Impreza's the lambda isnt used at all on WOT but not sure on Honda's....
MB
Joined: May 2004
Posts: 3,403
Likes: 6
From: DFW, TX
Personally, my opinion is that for the cost of the J's you might as well go AEM EMS where you will be able to adjust timing and fuel, and optimize it for all your mods. The VAFC is good enough in most cases for most people that aren't looking to go all out, and it is easily possible to make 230n/a whp with a VAFC and supporting mods. Just look at version JDM. He is almost there.
And you are correct that the ECU will adjust timing due to knock. I was thinking more along the lines of advancing timing rather than retarding time. As one gains you power and the other looses power. Because the engine shouldn't be knocking, you should not be seeing changes in timing from the set map
And you are correct that the ECU will adjust timing due to knock. I was thinking more along the lines of advancing timing rather than retarding time. As one gains you power and the other looses power. Because the engine shouldn't be knocking, you should not be seeing changes in timing from the set map
Thread Starter
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Joined: Jul 2005
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From: formerly versionJDM
Originally Posted by Silver9k,Jan 16 2006, 04:39 PM
Personally, my opinion is that for the cost of the J's you might as well go AEM EMS where you will be able to adjust timing and fuel, and optimize it for all your mods. The VAFC is good enough in most cases for most people that aren't looking to go all out, and it is easily possible to make 230n/a whp with a VAFC and supporting mods. Just look at version JDM. He is almost there.
And you are correct that the ECU will adjust timing due to knock. I was thinking more along the lines of advancing timing rather than retarding time. As one gains you power and the other looses power. Because the engine shouldn't be knocking, you should not be seeing changes in timing from the set map
And you are correct that the ECU will adjust timing due to knock. I was thinking more along the lines of advancing timing rather than retarding time. As one gains you power and the other looses power. Because the engine shouldn't be knocking, you should not be seeing changes in timing from the set map
