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I didn't know the 7thegn EX where based on the VTEC-E... That's to bad So then I could take an HX ECM, put in my car and get 50+ MPG. BUt there was VTEC lean on the 92-95 civics too (or actually 94-95), just a not in passing
but doesn't a hx have no ac
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so normal running conditions (pre vtech) both exhaust valves open all the way and 1 intake valve opens all the way and 1 intake valve opens part way. When vtech kicks in under the preset conditions both exhaust valves open the same as before (becase no vtech on the exhaust side) and both intake valves open (fully) in the hotter cam profile .
so normal running conditions (pre vtech) both exhaust valves open all the way and 1 intake valve opens all the way and 1 intake valve opens part way. When vtech kicks in under the preset conditions both exhaust valves open the same as before (becase no vtech on the exhaust side) and both intake valves open (fully) in the hotter cam profile .
Yes? No?
VTEC dose nothing to exhaust on a SOHC motor. and the intake part is correct.
VTEC dose nothing to exhaust on a SOHC motor. and the intake part is correct.
OKay so our newer (D17) motor has VTEC on the intake, but it simply uses to cam lobes instead on three like the D16's. Does the VTEC-E affect the exhuast then or not? IF not, how come they get such good gas milage? You can not possibly say they get 50+ MPG when I am getting around 32 with the same motor. I've played with plenty of ignition curves, fuel curves and such and you won't get much better than what the factory gives you (maybe 5 MPG better), but that was on a '94 D16. So there must be somehting much more than the ECU to get that kind of MPG.
OKay so our newer (D17) motor has VTEC on the intake, but it simply uses to cam lobes instead on three like the D16's. Does the VTEC-E affect the exhuast then or not? IF not, how come they get such good gas milage? You can not possibly say they get 50+ MPG when I am getting around 32 with the same motor. I've played with plenty of ignition curves, fuel curves and such and you won't get much better than what the factory gives you (maybe 5 MPG better), but that was on a '94 D16. So there must be somehting much more than the ECU to get that kind of MPG.
NO SOHC VTEC Effects exhuast, ever. I am not just saying they are the same motor i know they are, just read the tech book pages I listed. If you took a HX and put a EX ECU in you would have a EX (almost the HX has one valve that dosent open as much but very very close)
I'm getting 20mpg max now does that mean my vtec is broken
No your ECU will always follow the same fuel map (unless you are changing it with piggy back) thats why its bad to lower your VTEC without adding more fuel.
I get about 25mpg but thats because i run rc 550cc injectors with a buch of boost.
Okay maybe you might know this. How exactly does our ecu work? I've heard things like if you reset it, all the fuel maps get erased and the manual just says do it for idle learn. I've reset it whenever adding or removing mods, and most of the time the idle is already fine. Is it true that the fuel maps have to be relearned, or are they a permanent part of the ecu. I'm also using a vafcII to add a little fuel under wide hi vtec maybe 1-2% correction due to it running lean in lower rpms.
No the ECU know the fuel and igniton maps permanently. Thats why swaping out ECU's within B motors is so popular. And if you put a D17A2 ECU on a D17A6 you would see some small gains. because the EX ECU is set with a better igniton and fuel map
So then I could take an HX ECM, put in my car and get 50+ MPG. BUt there was VTEC lean on the 92-95 civics too (or actually 94-95), just a not in passing 
