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i have an hx coupe and the only reason why i bought it was for the v-tec.man was i stupid.i have intake,exhaust,pulleys,and all the good stuff too but i saw the article:"concerns w/the x leanburn system". so is there a way to correct the fuel problem? ecu reprogramming?,injectors and fuelrail?,or apex safc or vafc sounds like a good idea.help me guys.and yes my gas milage was slightly hurt by the mods.i also have nitrous.i cant get over 60 mph when its on. could it be this bulls*it hx leanburn system?

 
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hmmm... never heard of that one... be more specific...

 
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[IMG]i/expressions/face-icon-small-confused.gif[/IMG] DID I MISS A THREAD ON HX?? someone plese fill me in!!

 
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what brand nitrous and what installation do you have on there?

 
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well,i am running holley NOS. i changed the sparkplugs(2 steps colder) everything works right but when i get to 60 mph while nitrius is activated,my intake manifold sounds flooded and im not gettin any juice.i would be slowing down and the rpms are getting higher. i think its this whole leanburn thing.correct me if im wrong and help me solve this problem so i can use my nitrous again

 
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??? you are slowing down but your engine speed (rpm) climbs??? if so this is can be serious

 
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<< ....i saw the article:"concerns w/the x leanburn system".... >>



Where is this article? Do you have a link? I'd like to check it out.
Thanks!

EDIT: Oops, my bad. I just did a search for it. When you called it an article instead of a thread I thought it was something you saw on another website.

 
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Dude let me know what you find. I have an HX too and was eventually planning for some N02. It sounds like it may be your clutch slipping-

 
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I have an hx also. What intake and exhaust fits it most parts dont list if they work for the hx. Will parts for an Ex work for it?

 
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most parts do.but i dont think headers from an ex will fit

 
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Here is what I would try. Go to a wrecking yard and find a civic EX that matches your HX ie. Year, Transmission type (5-spd or Auto), major accessories such as Air conditioning. Remove the ECU, replace your HX ECU with the EX ECU, do this with the battery disconected because sparks = bad! Then follow the procedure for resetting the ECU (in DIY thread) take the car for a test drive, this should fix your fuel problem and get rid of the lean burn logic.

 
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<< Here is what I would try. Go to a wrecking yard and find a civic EX that matches your HX ie. Year, Transmission type (5-spd or Auto), major accessories such as Air conditioning. Remove the ECU, replace your HX ECU with the EX ECU, do this with the battery disconected because sparks = bad! Then follow the procedure for resetting the ECU (in DIY thread) take the car for a test drive, this should fix your fuel problem and get rid of the lean burn logic. >>



[IMG]i/expressions/laugh2.gif[/IMG] yah that ex ecu is going to mate right into that hx motor

 
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<< Here is what I would try. Go to a wrecking yard and find a civic EX that matches your HX ie. Year, Transmission type (5-spd or Auto), major accessories such as Air conditioning. Remove the ECU, replace your HX ECU with the EX ECU, do this with the battery disconected because sparks = bad! Then follow the procedure for resetting the ECU (in DIY thread) take the car for a test drive, this should fix your fuel problem and get rid of the lean burn logic. >>

That's not going to work, the VTEC-E is a different version. The switch-over point is about 2500rpm and that is when the secoundary intake valve follows the primary. Other wise under the 2500rpm the secoundary follows a almost round lobe that only bumps the valve open slightly to prevent fuel pooling.

 
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Think about it, do YOU honestly believe Honda would design and build 2 completely diffrent cars? NO! The ECU will plug in, yes oil pressure does enguage the VTEC but a Solenoid is used to control the points at which the oil moves the pin into position the enguages the VETC. This solenoid is controled by the ECU, that is why you can control when VTEC starts by wiring in a external control box otherwise known as A-VFC. The engine is the same only the software is diffrent. Honda modified the fuel curve and ignition timing to create a more efficent car and changed the final drive ratio to increase fuel mileage.

 
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<< Think about it, do YOU honestly believe Honda would design and build 2 completely diffrent cars? NO! The ECU will plug in, yes oil pressure does enguage the VTEC but a Solenoid is used to control the points at which the oil moves the pin into position the enguages the VETC. This solenoid is controled by the ECU, that is why you can control when VTEC starts by wiring in a external control box otherwise known as A-VFC. The engine is the same only the software is diffrent. Honda modified the fuel curve and ignition timing to create a more efficent car and changed the final drive ratio to increase fuel mileage. >>

Blaw Blaw Blaw, yeah whatever dude. Go buy a Helms manual and look for your self, the camshaft might give you a clue?

 
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Dunno if swapping ECUs work in Hondas is the same, but on a Ford, for example, you can take out the civilian ECU in a Crown Vic and put a police ECU from a wrecked Police Interceptor. The result was a civi Vic that acted like a PI...with a different differential ratio & single exhaust.

 
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<< Go buy a Helms manual and look for your self, the camshaft might give you a clue? >>



So, is the only engine difference between an EX and HX the cam?

 
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<<

<< Go buy a Helms manual and look for your self, the camshaft might give you a clue? >>



So, is the only engine difference between an EX and HX the cam? >>



No the whole head is a different casting. The EX is it's own casting. So if you want to think about getting a HX to EX conversion, you were better off spending the extra $4000 for an EX. You are going to have to replace the intake/exhaust manifolds,the entire head assembly,ECU,transaxle- to match the better gear ratios, so unless you can find a recked EX for cheap $. Don't even bother, you are only looking at 10hp and 3ft/lbs of torque more anyway, plus a little less lag in the gearing.