2004 Lancer Sportback Ralliart AT Build
#286
Never heard of silicone you could use on exhaust you sure its not jb weld? I think it would burn up... And crans im pretty sure the injectors are always squirting fuel prolly for a short period of time but I'm like 95% sure they don't stop prolly on newer vehicles to cut down emissions but I don't see the ecu cutting off fuel
#287
Thread Starter
Joined: May 2011
Posts: 1,732
Likes: 9
From: So. Jersey (San Diego native)
Never heard of silicone you could use on exhaust you sure its not jb weld? I think it would burn up... And crans im pretty sure the injectors are always squirting fuel prolly for a short period of time but I'm like 95% sure they don't stop prolly on newer vehicles to cut down emissions but I don't see the ecu cutting off fuel
the whole point behind the injector statement was to clarify the reason as to why i was installing larger injectors and MAP sensor on my NA engine, and explaining that any size injector will work on a properly programmed ECU. How they work is irrelevant. Sorry, just trying to stay on the subject .
Last edited by truthdweller; Dec 1, 2012 at 07:17 PM.
#288
Were you reving in neutral, or doing an actual pull? the reason is because the load on the engine plays a role in the fuel map, where a neutral rev, has no load, so AFR would be close to target idle AFR. the more load there is on the engine, the richer it should be...like 13.4-13.9 would be a good high rpm AFR for a 2nd or 3rd gear pull. then again the way an automatic uses engine power is much different than a manual...
It wouldn't make sense to spray less fuel, this would create a lean condition. that and it wouldn't be to reduce emissions, because not fuelling would reduce emissions, and not fuelling would save fuel, so it's a win-win system...these are computers, they deal with fuel and iginition timing in the micro-seconds...6000rpm is 100rps that's a lot of combustion cycles in one second, and fuel delivery and ignition are tiny fractions of each revolution.
Last edited by CrAnSwIcK; Dec 1, 2012 at 07:43 PM.
#289
Thread Starter
Joined: May 2011
Posts: 1,732
Likes: 9
From: So. Jersey (San Diego native)
Were you reving in neutral, or doing an actual pull? the reason is because the load on the engine plays a role in the fuel map, where a neutral rev, has no load, so AFR would be close to target idle AFR. the more load there is on the engine, the richer it should be...like 13.4-13.9 would be a good high rpm AFR for a 2nd or 3rd gear pull. then again the way an automatic uses engine power is much different than a manual...
Last edited by truthdweller; Dec 1, 2012 at 07:53 PM.
#291
Hi guys. Someone asked me to read and comment on this.
First, the manifold that I've been making suits the T3/T04B with an internal wastegate. I have one left that "someone in this thread" has dibs on. I do have a second one partially made so I could probably finish it if someone wanted to buy it off me.
Second, the size of the injectors doesn't really matter as I just program the ECU to run whatever size you have. Even if there is a tiny exhaust leak in the system it really only affects the reading at idle. 14.2 is way too lean at WOT - assuming you're driving. Normal ralliarts will run 10.6:1 at high RPMs and WOT. Possibly the MAF sensor is going bad, there is a massive intake leak or some other reason for this.
I like the idea of moving over to the larger injectors while still NA given that an unknown injector can be tweaked until it runs perfectly without the added complication of adding boost too. Different turbos flow different amounts so that's complicated too.
-Michael
First, the manifold that I've been making suits the T3/T04B with an internal wastegate. I have one left that "someone in this thread" has dibs on. I do have a second one partially made so I could probably finish it if someone wanted to buy it off me.
Second, the size of the injectors doesn't really matter as I just program the ECU to run whatever size you have. Even if there is a tiny exhaust leak in the system it really only affects the reading at idle. 14.2 is way too lean at WOT - assuming you're driving. Normal ralliarts will run 10.6:1 at high RPMs and WOT. Possibly the MAF sensor is going bad, there is a massive intake leak or some other reason for this.
I like the idea of moving over to the larger injectors while still NA given that an unknown injector can be tweaked until it runs perfectly without the added complication of adding boost too. Different turbos flow different amounts so that's complicated too.
-Michael
#293
#294
thought wrong...650° silicone for making gaskets...
the whole point behind the injector statement was to clarify the reason as to why i was installing larger injectors and MAP sensor on my NA engine, and explaining that any size injector will work on a properly programmed ECU. How they work is irrelevant. Sorry, just trying to stay on the subject .
the whole point behind the injector statement was to clarify the reason as to why i was installing larger injectors and MAP sensor on my NA engine, and explaining that any size injector will work on a properly programmed ECU. How they work is irrelevant. Sorry, just trying to stay on the subject .
#295
not sure on the reset, there may be a pin-hole logic reset button or something on the back, i don't remember. I don't have the manual for mine, i borrowed the manual from my buddy, for installation, and gave it back.
there's stuff you can buy, it's like a high temp epoxy specifically for patching exhaust leaks, that RTV might still burn off, i used it on all my laser cut steel turbo gaskets, and it stinks when it burns, lol. The reason i asked was just that your WOT reading seems leaner than a good tune, unless you have fuel delivery issues, and the ECU is pulling timing so i'll clarify:
Were you reving in neutral, or doing an actual pull? the reason is because the load on the engine plays a role in the fuel map, where a neutral rev, has no load, so AFR would be close to target idle AFR. the more load there is on the engine, the richer it should be...like 13.4-13.9 would be a good high rpm AFR for a 2nd or 3rd gear pull. then again the way an automatic uses engine power is much different than a manual...
The ECU absolutely cuts fuel when you let off...i know this partly because most, if not all modern fuel injected cars do this, and my wideband shows me that it's happening...below a certain speed, it will resume fuelling.
It wouldn't make sense to spray less fuel, this would create a lean condition. that and it wouldn't be to reduce emissions, because not fuelling would reduce emissions, and not fuelling would save fuel, so it's a win-win system...these are computers, they deal with fuel and iginition timing in the micro-seconds...6000rpm is 100rps that's a lot of combustion cycles in one second, and fuel delivery and ignition are tiny fractions of each revolution.
there's stuff you can buy, it's like a high temp epoxy specifically for patching exhaust leaks, that RTV might still burn off, i used it on all my laser cut steel turbo gaskets, and it stinks when it burns, lol. The reason i asked was just that your WOT reading seems leaner than a good tune, unless you have fuel delivery issues, and the ECU is pulling timing so i'll clarify:
Were you reving in neutral, or doing an actual pull? the reason is because the load on the engine plays a role in the fuel map, where a neutral rev, has no load, so AFR would be close to target idle AFR. the more load there is on the engine, the richer it should be...like 13.4-13.9 would be a good high rpm AFR for a 2nd or 3rd gear pull. then again the way an automatic uses engine power is much different than a manual...
The ECU absolutely cuts fuel when you let off...i know this partly because most, if not all modern fuel injected cars do this, and my wideband shows me that it's happening...below a certain speed, it will resume fuelling.
It wouldn't make sense to spray less fuel, this would create a lean condition. that and it wouldn't be to reduce emissions, because not fuelling would reduce emissions, and not fuelling would save fuel, so it's a win-win system...these are computers, they deal with fuel and iginition timing in the micro-seconds...6000rpm is 100rps that's a lot of combustion cycles in one second, and fuel delivery and ignition are tiny fractions of each revolution.
#297
oh sorry, you said "they don't stop prolly on newer vehicles"...i thought you meant the injectors don't stop spraying to reduce emissions, which didn't make sense to me...my point is that when you let off, the ECU does in fact cut fuel
#298
Thread Starter
Joined: May 2011
Posts: 1,732
Likes: 9
From: So. Jersey (San Diego native)
I used what the muffler shop recommended. It's not melting off, and I'm not turbo. When I go turbo the down pipe and flex pipe will be changed, and this sealant will obviously not be considered with temps approaching/exceeding 900°F.