Tuning With CJM Fuel & Vortech...Pres Drop
10-02-2007 | 07:17 AM
#21
Originally Posted by phunk
if a new assembly helped the situation, that is a sign of a clogged internal filter. that is the only thing in the pump assembly that could cause a problem, unless your regulator plug o-ring is not sealing, that would allow pressure to internally leak back into the canister.
supercharger cars will max out the fuel system quite a bit sooner, but i would think that 450rwhp would most likely be no problem for the setup... hard to say, but turbo guys can get mid 500s out of the stage 1.
its only blower guys having this fuel system capacity problem from what i have seen, which makes me tend to believe that its close to maxing out the fuel system if its being picky about fresh filters etc. There is no where to go wrong in the hoses/rails/etc for the setup. The aeromotive regulator is very simple and reliable and i have never had anyone need me to replace one yet.
sounds like the pump itself is close to maxing out, and right about the point where a single walbro is maxed out, i think the stock 5/16 hardline used in stage 1 kits is going to become a setback, and also the stock canisters internal plumbing as well, as its not very open in there, i have taken them apart.
if you need anything from me, feel free to contact me via PM or email and I will do whatever I can.
supercharger cars will max out the fuel system quite a bit sooner, but i would think that 450rwhp would most likely be no problem for the setup... hard to say, but turbo guys can get mid 500s out of the stage 1.
its only blower guys having this fuel system capacity problem from what i have seen, which makes me tend to believe that its close to maxing out the fuel system if its being picky about fresh filters etc. There is no where to go wrong in the hoses/rails/etc for the setup. The aeromotive regulator is very simple and reliable and i have never had anyone need me to replace one yet.
sounds like the pump itself is close to maxing out, and right about the point where a single walbro is maxed out, i think the stock 5/16 hardline used in stage 1 kits is going to become a setback, and also the stock canisters internal plumbing as well, as its not very open in there, i have taken them apart.
if you need anything from me, feel free to contact me via PM or email and I will do whatever I can.
10-02-2007 | 08:46 AM
#22
Originally Posted by booger
This does go along with the thread I had about a SCed car needing 20 to 25% more fuel than a turbo car . The artical stated if you needed fuel for 400whp , you need to supply fuel for 500-525whp due to parasitic lose . When I ever get around to getting mine finished , we'll see if I start maxing it out also .
10-02-2007 | 08:57 AM
#23
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Sentry, what year fuel assembly did you replace yours with? I think I replaced mine with a 04. Do the 06, 07 Zs use the same fuel assmebly or a compatible one. Id buy one and try it if you think its worth a shot.
10-02-2007 | 09:09 AM
#24
Originally Posted by Barzten1
Sentry, what year fuel assembly did you replace yours with? I think I replaced mine with a 04. Do the 06, 07 Zs use the same fuel assmebly or a compatible one. Id buy one and try it if you think its worth a shot.
i have never seen any variances that would explain the issues we are seeing..but anyone have anything to add?
10-02-2007 | 09:36 AM
#25
I'm really not sure what year my pump assembly is for. GTM picked one up at the nissan dealership when I was there. I'm not even sure if there is anything different about it from year to year. There might not be any difference at all. It's just a weird coincedence that both of us have aug 02 build dates and have the same sorta problem so it's a little suspicious
10-02-2007 | 03:56 PM
#26
Originally Posted by sentry65
doesn't explain why me and Barzten1 start maxing out and dropping pressure while others with the CJM system and vortech haven't
10-02-2007 | 05:48 PM
#29
Originally Posted by sentry65
I'm running 750's which didn't make any difference from when I switched from 550's
wouldn't the fuel pressure be high if I was maxing out the injectors anyway?
wouldn't the fuel pressure be high if I was maxing out the injectors anyway?
Fuel presure shouldnt rise because a fuel injector is maxed out...I wouldnt think anyway
10-03-2007 | 09:05 AM
#32
The injectors would have nothing to do with rising pressure because the pump just supplies a given volume of fuel and the restriction in the return line (FPR) is the only thing that will raise the pressure. What ever given volume won't flow through the injectors when you max them out will simply go out through the FPR and return to tank.
A pressure drop is most likely from not enough fuel being flowed by the pump. or a restriction in the supply line.
I'm hoping that I don't run into to issues with this on my supercharger setup.
A pressure drop is most likely from not enough fuel being flowed by the pump. or a restriction in the supply line.
I'm hoping that I don't run into to issues with this on my supercharger setup.
10-03-2007 | 09:08 AM
#33
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No, my fuel pressure takes a dive but my a/f is still in the low to mid 11's. I've always wondered about giving up on Vortech and going with turbos. This is really plenty of usable power for me. Im very happy with it. If you guys have a good tuner and a vortech kit, slap on the 2.87 pulley. Huge difference.
10-03-2007 | 09:47 AM
#34
yeah each pulley step up is a big deal change because it not only increases the overall power, but also makes it come on about 500 rpms sooner than before. After the 2.87 you can get the 34 tooth rear cog pulley and take it up even another step, but belt slip and fuel are going to be the issues to work out
I laugh every time I read about guys running a stock vortech with the 3.33 pulley then say it's just not powerful enough and switch to turbos. They didn't even give the kit a chance to show what it can do.
I laugh every time I read about guys running a stock vortech with the 3.33 pulley then say it's just not powerful enough and switch to turbos. They didn't even give the kit a chance to show what it can do.
10-03-2007 | 09:54 AM
#35
yeah each pulley step up is a big deal change because it not only increases the overall power, but also makes it come on about 500 rpms sooner than before. After the 2.87 you can get the 34 tooth rear cog pulley and take it up even another step, but belt slip and fuel are going to be the issues to work out
I laugh every time I read about guys running a stock vortech with the 3.33 pulley then say it's just not powerful enough and switch to turbos. They didn't even give the kit a chance to show what it can do.
I laugh every time I read about guys running a stock vortech with the 3.33 pulley then say it's just not powerful enough and switch to turbos. They didn't even give the kit a chance to show what it can do.
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