I have a walbro 190lph pump lying around and wondering if it will:
Increase fuel volume being pumped to injectors (or will the injector resistor prevent this)
Increase the fuel pressure (or will the fuel pressure regulator prevent this)
Will it be beneficial to upgrade the cpu wihile doing this?
funny, I thought all bseries have a fuel pressure of 43.5psi…
41-48 or 48-56 is what the 92 Integra manual says for B18 or B17 (respectively) but I don’t have a 90-91 helms and made a guess for the earlier Integra based on that 1990 VTEC supplement for the Civic. I had that manual more handy than the OBD1 integra one so that is the number I threw out there. I figured since the real question was “will my car go faster if I put in this fuel pump” that it didn’t really matter.
As far as 43.5, that may be the target set value for many B18s, but the actual output from the pump (or at least the OEM acceptable limits) varies widely from 92-01 for the different chassis whose manuals I do have access to.
heres something cool to know… 90-01 integras with or without vtec and type r’s too (USDM acuras and vtec honds) all have the same ratings for the FP(fuel pump)… this is something i looked up on to at work cuz i work at an auto store… i wanted to use a type r FP cuz we hand one on stock but i also looked up the fuel pump for my GSR and the LS’ fuel pumps and they were all the same in ratings
can i ask i y do u need more fuel pressure??? are u turbo or higher compression or bigger injectors…if not theres no point in putting it in
People have done thousands and thousands of vtec swaps into non vtec cars and never had to worry about fuel pressure. I am sure if there was a need for a VTEC engine to have higher fuel pressure someone would of mentioned it by now.
Just because two cars have the same fuel pump does not mean they will have the same fuel pressure. But at the same time, just because they have different fuel pressures at the test port of the fuel filter does not mean they will have the same fuel pressure at the injectors.
VTEC engines don’t need more fuel delivery but the problem you can run with a car like a CRX is the 240cc injectors can’t deliver enough fuel with that lower pressure. This happened to a friend of mine with a 88 CRX DX with an OBD0 B16 that he put a little work into. If it had been an OBD1 B16 with a 43.5psi regulator, it would have been fine but with his fuel pressure, they effectively became 220cc injectors and it just wasn’t enough. He went to some larger injectors and the problem was solved, which is the correct way to do that by the way – with appropriate injectors and a tune, not some stupid pump and a fancy looking fuel pressure regulator.
I am planning on going turbo, I had originally bought the 225lph hp, however, after checking the
part number the guy on ebay sent me the 190 and it was way to late to return the pump. I
realize I will probably need the 255 in the future, but I was just curious how an otherwise stock
b18a will respond to a 190lph pump.