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| EDXR8 |
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Well you have to work out why it is pinging and my guess wouldn't be because it is leaning due to the fuel injectors being too small. Even though he is close to the limit at 168rwkw, the AFRs normally don't start leaning up enough to cause issues until 180rwkw or so.
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| XR9UTE |
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Your fuel pump is likely the culprit. At 88 L/Hr it is good for f**k!
Even at 100% duty your 19's need 95L/hr so it's not even enough for them! Pete. |
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| gunit18 |
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so if i was say pushing up around 170-180rwkw, could i just get away with a larger fuel pump for now, if it was leaning out up high? until i save up for injectors/maf?
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| One Drone |
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Or get a fuel pump, fuel reg and hope the pressure is enough.. Plenty do it in the states.
_________________ There are 10 types of people in this world. |
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| EBXR8380 |
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{USERNAME} wrote: Or get a fuel pump, fuel reg and hope the pressure is enough.. Plenty do it in the states.
24 and 30 Lb are cheap as over there..They are going away from FMU's now and tuneing properly....
_________________ As in ZOOM 126 edition |
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| XR9UTE |
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Yes a larger pump could keep you safe but don't immediately get a great bloody big 200 odd L/hr pump unless you are going to use it. All that does is needlessly circulate fuel up to the engine and back which makes it hot. When the fuel is hot you will get excess tank vapours which will saturate your charcoal canister and have you sniffing the fumes. Plus you will wear out your pump and injectors faster.
If you are only going to go the next step and use 24's you want a 110L/hr pump to operate them at a safe 90% max duty cycle. Cheers, Pete. |
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| xr8boy |
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Yeah i think its my fuel pump aswell, getting an engine cut out when cornering hard and at full throttle acceleration
Wat is the part # for the bolt in 255 walbro pump
_________________ New project 5.4l 331ci S380R, 8.2 4.125 Man o war, Billet LAE crank, Jon Kaase Heads, Pauter Rods, JE pistons |
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| mickoxhxr8 |
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[quote="XR9UTE"]Yes a larger pump could keep you safe but don't immediately get a great bloody big 200 odd L/hr pump unless you are going to use it. All that does is needlessly circulate fuel up to the engine and back which makes it hot. When the fuel is hot you will get excess tank vapours which will saturate your charcoal canister and have you sniffing the fumes. Plus you will wear out your pump and injectors faster.
If you are only going to go the next step and use 24's you want a 110L/hr pump to operate them at a safe 90% max duty cycle. Is it possible to remove/ Block the return line when upgrading pump & reg? |
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| mickoxhxr8 |
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[quote="XR9UTE"]Yes a larger pump could keep you safe but don't immediately get a great bloody big 200 odd L/hr pump unless you are going to use it. All that does is needlessly circulate fuel up to the engine and back which makes it hot. When the fuel is hot you will get excess tank vapours which will saturate your charcoal canister and have you sniffing the fumes. Plus you will wear out your pump and injectors faster.
If you are only going to go the next step and use 24's you want a 110L/hr pump to operate them at a safe 90% max duty cycle. Is it possible to remove/ Block the return line when upgrading pump & reg? |
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| xr8ute |
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{USERNAME} wrote: Is it possible to remove/ Block the return line when upgrading pump & reg?
You could possibly convert it to a "returnless" fuel system? Not sure how feasible this would be though....and no real benefit that i can think of. Why would you want to block the return line? |
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| EDXR8 |
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Yeah not really a good idea to block the return line, the conversion would be pretty complicated and as far as I am aware, returnless systems have a number of draw backs and require specific fuel pumps. Over-circulating fuel due to a bigger fuel pump is an issue but isn't worth worrying about if you already ahve the pump. If you still need to buy one, then look at a 155l/hr or 190l/hr one, but if you have the 255l/r one of think you may need it in the future I wounldn't really worry too much.
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| mickoxhxr8 |
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[quote="xr8ute"][quote="mickoxhxr8"]Is it possible to remove/ Block the return line when upgrading pump & reg?[/quote]
You could possibly convert it to a "returnless" fuel system? Not sure how feasible this would be though....and no real benefit that i can think of. Why would you want to block the return line?[/quote] To remove recirculation problems as mentioned. |
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| GTENVY |
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{USERNAME} wrote: I got 193rwkw with 19lb injectors.
Upgraded to the 30's, and with no other mods (other than a retune) got 205.7rwkw You got that stroker built yet XR8Chic ???????
_________________ My wheel nuts require more torqure than your toyota makes. |
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| XR9UTE |
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{USERNAME} wrote: {USERNAME} wrote: {USERNAME} wrote: Is it possible to remove/ Block the return line when upgrading pump & reg? You could possibly convert it to a "returnless" fuel system? Not sure how feasible this would be though....and no real benefit that i can think of. Why would you want to block the return line? To remove recirculation problems as mentioned. This would dead head the fuel pump and pressure would go through the roof...not good for both pump life and the calibration would be out the window. You could go to a returnless system but you'd have to switch to a U.S. EECV with this capability because it is a complex system to implement. Pete. |
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