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SVTPerformance's Chain of Restaurants
The Distillery
E54: Facts compared to E85?
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<blockquote data-quote="JeremyH" data-source="post: 15803124" data-attributes="member: 160292"><p>I will list the basic steps for upgrading the gt500 fuel system while maintaining it return-less this is from years of testing and doing fuel stuff on dozens of gt500 setups. I will list these in order that makes the most sense benefit as well as money wise and they also compound or support each other.</p><p></p><p>-First thing to do is upgrade the oem 12awg power wire to the relay with a 8awg wire. This mod costs about $20-25 will lower duty cycle and extend your fuel system 10-12%. Its one of the most often overlooked things when beefing up a fuel system since pumps loose flow the more current they pull and the hotter they run. Its also key if/when you add a bap or bigger pumps later since they both will pull more current.</p><p></p><p> </p><p></p><p>-Next step is to upgrade to 8an feed line and filter from hat to rails. This mod alone will drop duty cycle 25% on stock pumps at the 600hp level. And make it so any future pump flow upgrades can make it to rails better and are more effective. Again this is often overlooked. This mod gets you similar range if not better as a pump upgrade or bap would. To run the Fore stuff 8an line/fittings and their filter plus the specialty efi adaptor fittings runs about $250-275.</p><p></p><p> </p><p></p><p>-From there your looking at a bap or bigger pumps, which one you go with is a matter of preference for you. A standard 16-18volt bap will get you about 20% more range or about 100hp. Do not run more voltage than that if your car sees regular street use, even the aftermarket pumps are only rated to 18volts. You can run a expensive dual bap which is simply two 20amp baps in single case. Or run a single 40amp bap which is cheaper. The bap should be wired post relay and pre fpdm's so the pcm can still control the extra voltage properly to the pumps via the fpdms (ie. the pumps only see the extra voltage when needed.) To wire the single bap you just split the bap output so it feeds into the input of each fpdm. Again if you hadnt't done so already you want 8awg wire from power source to relay and from relay into the bap. Out of the bap 10 or 12awg is adequate. Depending on which bap you go with you could spend $200-400 here.</p><p></p><p> </p><p>-The largest pumps the pcm/fpdm can effectively handle through the boost power range and are proven as of today are 320-340lph pumps. Your best options is the dw300m pumps as they are direct fit on the g500 hat plug and play. Other versions of these pumps require work and modification to the hat to fit. I modified a few gt500 hats with walbro 400 and 465 pumps for testing and had issues with pressure spikes as the flow rates and on ramp of fuel was too great for the feedback loop to handle which led to pressure and afr control issues at higher boost levels. I do not recommend trying this and your tuner will hate you. I have not tested the new dw400 pumps but since its a flow thing and the system is constantly adjusting pulse width to maintain pressure I surmise they will have similar issues when two are run together as you push them, just too much flow to properly handle and ramp up and down. A single 400 or 465 does work properly on a GT setup. Its not to say you cant get the setup tuned to work, things just get squirelly in the datalogs at those higher boost levels. So you effectively cant even push those pumps up to what they are supposed to flow properly, hence why a 320-340lph pump is a much better bet in a dual configuration. The two dw300m pumps run around $325.</p><p></p><p> </p><p></p><p>-And the full boogie return-less upgrade would be all of this wire, line/filter, bap, pumps upgrades. Anymore than this and returnless starts to have issues and you knocking on the edge of needing a return system anyway.</p></blockquote><p></p>
[QUOTE="JeremyH, post: 15803124, member: 160292"] I will list the basic steps for upgrading the gt500 fuel system while maintaining it return-less this is from years of testing and doing fuel stuff on dozens of gt500 setups. I will list these in order that makes the most sense benefit as well as money wise and they also compound or support each other. -First thing to do is upgrade the oem 12awg power wire to the relay with a 8awg wire. This mod costs about $20-25 will lower duty cycle and extend your fuel system 10-12%. Its one of the most often overlooked things when beefing up a fuel system since pumps loose flow the more current they pull and the hotter they run. Its also key if/when you add a bap or bigger pumps later since they both will pull more current. -Next step is to upgrade to 8an feed line and filter from hat to rails. This mod alone will drop duty cycle 25% on stock pumps at the 600hp level. And make it so any future pump flow upgrades can make it to rails better and are more effective. Again this is often overlooked. This mod gets you similar range if not better as a pump upgrade or bap would. To run the Fore stuff 8an line/fittings and their filter plus the specialty efi adaptor fittings runs about $250-275. -From there your looking at a bap or bigger pumps, which one you go with is a matter of preference for you. A standard 16-18volt bap will get you about 20% more range or about 100hp. Do not run more voltage than that if your car sees regular street use, even the aftermarket pumps are only rated to 18volts. You can run a expensive dual bap which is simply two 20amp baps in single case. Or run a single 40amp bap which is cheaper. The bap should be wired post relay and pre fpdm's so the pcm can still control the extra voltage properly to the pumps via the fpdms (ie. the pumps only see the extra voltage when needed.) To wire the single bap you just split the bap output so it feeds into the input of each fpdm. Again if you hadnt't done so already you want 8awg wire from power source to relay and from relay into the bap. Out of the bap 10 or 12awg is adequate. Depending on which bap you go with you could spend $200-400 here. -The largest pumps the pcm/fpdm can effectively handle through the boost power range and are proven as of today are 320-340lph pumps. Your best options is the dw300m pumps as they are direct fit on the g500 hat plug and play. Other versions of these pumps require work and modification to the hat to fit. I modified a few gt500 hats with walbro 400 and 465 pumps for testing and had issues with pressure spikes as the flow rates and on ramp of fuel was too great for the feedback loop to handle which led to pressure and afr control issues at higher boost levels. I do not recommend trying this and your tuner will hate you. I have not tested the new dw400 pumps but since its a flow thing and the system is constantly adjusting pulse width to maintain pressure I surmise they will have similar issues when two are run together as you push them, just too much flow to properly handle and ramp up and down. A single 400 or 465 does work properly on a GT setup. Its not to say you cant get the setup tuned to work, things just get squirelly in the datalogs at those higher boost levels. So you effectively cant even push those pumps up to what they are supposed to flow properly, hence why a 320-340lph pump is a much better bet in a dual configuration. The two dw300m pumps run around $325. -And the full boogie return-less upgrade would be all of this wire, line/filter, bap, pumps upgrades. Anymore than this and returnless starts to have issues and you knocking on the edge of needing a return system anyway. [/QUOTE]
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E54: Facts compared to E85?
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