Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

Camshaft problem?

Old 06-Sep-2007, 12:36 PM
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Camshaft problem?

Hey what's up! I recently installed a Delta 272 camshaft in my B7 sohc. I have the basic I/H/E, Z6 IM, 0.40" milled off the head, kept the stock rev limit. Anyway's I have not had it tuned yet, but recently everytime I try to punch it all I can smell is gas?
Do I need a FPR and gauge, or is my A/F messed up? If I have to ajust my A/F ratio how do I this? Any help would be appreciated. Thank's.
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Old 06-Sep-2007, 01:12 PM
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The only way you can adjust the air/fuel ratio is by adjusting an adjustable fuel pressure regulator (raising or lowering the fuel pressure). I wouldn't really say thats the best way of adjusting the fuel though, its a very general way that will pull/add fuel over the whole rev band. Whereas with crome/hondata/greddy emanage/AEM EMS/etc etc you have complete control over the entire fuel map and you can add an overall fuel trim (sort of like when changing the fuel pressure). So if your car needs more fuel from 2500-3500rpms and a little less between 4000-5500rpms and a butt load more from 5500rpms up you can adjust each RPM/vacuum point independantly. While when you just raise the fuel pressure b/c the car needs more up top, you are also adding fuel at idle/partial throttle b/c you are making the injectors squirt more fuel each time they open by increasing the fuel pressure. But the advantage of a real engine management system is the control over the ignition timing as well as fuel and separately from each other (and a whole whack of other stuff, like vtec, rev limit, 2 step, boost control, yadda yadda).
A vafc is a crappy way IMO of controlling fuel, b/c it doesn't have separate fuel and ignition control, as you adjust the fuel, the ecu is changing the timing b/c the vafc just tricks the ecu into thinking its running under different conditions.
I'd get it tuned, b/c whenever you change the camshaft(s) you are changing how and how much the air is entering/exiting the engine so you NEED to adjust how much fuel is being delivered as well (tuning).
But i'd maybe check for a fuel leak if you smell gas really bad, check to see if there is any wetness on the gas tank (sides, top, bottom), check to see if you can see it leaking anywhere (fuel lines, injectors, fuel rail, fuel filter).
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