senna_T Forged Member Lifetime Members 15,818 Member For: 17y 11m 15d Gender: Male Location: SW Sydney Posted 20/04/08 04:05 AM Share Posted 20/04/08 04:05 AM I hope I don't explain this wrong, but anyway...Detonation is also reffered to as "pinging" this sounds like shaking a tin can full of marbles - not a pleasant sound and means the piston is trying to find the quickest way out of the block! This is an extreme case of your fuel system being under-done. Another way of telling if your fuel pump is maxed is if you feel the car surge - kind of like lifting off the gas slightly when under WOT. This is when the injectors are using up the fuel in the fuel rail and the pump can't supply it quick enough.I would think that standard injectors wouldn't be able to flow enough to out run the stock fuel pump anyway, but if you get bigger injects, definately get a bigger fuel pump. Link to comment Share on other sites More sharing options...
XR6 Turbo Developments Member 100 Member For: 16y 11m 5d Gender: Male Location: Dandenong Posted 20/04/08 10:22 AM Share Posted 20/04/08 10:22 AM All the standard pumps will flow around the same amount. We have found that pumps dont really run out of fuel flow its the fuel pressure that becomes an issue. You will find that the standard fuel pumps have a presure relief valve. When the inlet plenum presurises and the injectors open the pressure of the fuel system combined with the pressure in the inlet raises the pressure of the fuel system which opens the pumps relief valve. Results is a loss of fuel pressure and not fuel flow.GSS342 is the pump you want. Link to comment Share on other sites More sharing options...
jetute Donating Members 4,553 Member For: 20y 11m 21d Gender: Male Location: brisbane Posted 20/04/08 11:09 AM Share Posted 20/04/08 11:09 AM ok, so next question how would you tell when a fuel pump has reached its limits.senna_t you say it is an easy way to get detonation, could you explain what detonation is and how to tell if your engine is doing it?imagine a dwarf sitting under your bonnet throwing handfulls of gravel up at your bonnet... that's detonation!! 1 Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 3m 30d Gender: Male Location: Perth Posted 20/04/08 11:15 AM Share Posted 20/04/08 11:15 AM All the standard pumps will flow around the same amount. We have found that pumps dont really run out of fuel flow its the fuel pressure that becomes an issue. You will find that the standard fuel pumps have a presure relief valve. When the inlet plenum presurises and the injectors open the pressure of the fuel system combined with the pressure in the inlet raises the pressure of the fuel system which opens the pumps relief valve. Results is a loss of fuel pressure and not fuel flow.GSS342 is the pump you want.Am i reading you post wrong or are you saying the relief on the pump cracks open because of the increased fuel rail pressure cause by the injectors squirting in to the pressurised intake manifold/plenum? Link to comment Share on other sites More sharing options...
XR6 Turbo Developments Member 100 Member For: 16y 11m 5d Gender: Male Location: Dandenong Posted 20/04/08 12:03 PM Share Posted 20/04/08 12:03 PM Am I reading you post wrong or are you saying the relief on the pump cracks open because of the increased fuel rail pressure cause by the injectors squirting in to the pressurised intake manifold/plenum?The increase in boost increases the fuel pressure which is controlled by the fuel presure regulator. Turn down the boost and the problem dissapears. Put a screw in the pressure relieve valve and turn the boost back and the issue goes.. that's not the correct fix but how we figured it out. Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 3m 30d Gender: Male Location: Perth Posted 20/04/08 12:12 PM Share Posted 20/04/08 12:12 PM Yes i understand that. you didnt mention the fuel pressure regulator in the previous post and it read like the pressure in the plenum creates additional pressure for the injectors to spray against. Link to comment Share on other sites More sharing options...
XR6 Turbo Developments Member 100 Member For: 16y 11m 5d Gender: Male Location: Dandenong Posted 20/04/08 12:25 PM Share Posted 20/04/08 12:25 PM Yes I understand that. you didnt mention the fuel pressure regulator in the previous post and it read like the pressure in the plenum creates additional pressure for the injectors to spray against.Realised that after I read my post LOL! Link to comment Share on other sites More sharing options...
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