Fuel System Issues After Supercharger Install

JeremyH said:

The wire upgrade will help with that stuff as well. It runs its own 40amp relay and 30amp fuse with larger wire for less resistance directly from the battery. So the stock wire and relay and fuse will see no current as its just run to ground to trigger the new relay and then supply power to the fpdm on the new better power wire. This is what lowers current draw of the pump, which means the motor runs cooler, improving pump control and flow, which can be seen from the lowering of pump duty cycle on a log.

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46addict said:

I noticed your sig mentions an Autolite H1. If you mean HT1 those are the wrong plugs and you need the HT0 for a boosted setup. Then close the gap to somewhere between .030 to .032.

The lambda activity sounds normal for the parts you're using. The Carquest pump will start out rich and lean out as it runs out of breath. Whereas the DW will enrich the mixture as the engine demands more fuel with more rpm. It sounds like the added current of the DW pump is straining the stock wiring system, so doing the wiring upgrade should help. Remember to mount the relay as close to the battery as possible so you can keep your power & ground wires short.

Lastly I would double check that the pump is accounted for in the tune, as Bruce mentioned.

And it's too late for this now but keeping the PPRV might have been better for you. One of the drawbacks of this mod is the starting problems you were having. If your duty cycles aren't on the edge of maxing out there's no need to delete the PPRV.

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JeremyH said:

To expand a little, you don't "need" hto's or colder plugs right off the bat on a basic setup, somehow that seems to have become the norm over the years. Compression, boost level, fuel type, iat etc will come into play when selecting the best plug heat range and gap for your setup. I have found the 3v likes some heat to make good power so dont feel like you "have" to have colder plugs or colder tsat etc, look at your setup and make a determination based on your goals. I felt like there were drawbacks of having colder or too cold plugs for what the setup needs, namely cold start drivability in cooler weather decrease in mileage etc, not a big deal if its a weekend or drag car, but if it sees regular street use might be a little annoying. In general 8-9psi 450-475hp range on a stock block with 93 or e85, the car seems to perform better with a stock heat range plug gapped appropriately. I would also take a look at the plugs after the setup is up and running and tuned to see if they are too hot or too cold for your setup. You can google or hit up youtube to see how to read a plug. If you have higher iat's with like a twin screw or procharger might want colder range just to keep things safer. I had colder hto's for a bit when I ran 93. When I started running e85 I went back to stock heat range with ht1's car feels better/smoother in the lower rpm range and runs good and makes good power. And I still run 93 with them as well. I run 12psi on 93 with them and 16psi with e85 760rwhp. Keep in mind my setup has ambient iat;s at that power level and motor is 9:1 compression. When I pulled out the ht1's after a year or so to put in a fresh set they all looked great still so stock heat range at .028 gap seems to be appropriate for my setup.

In general 10psi or less on 93 or e85 with decent iat's and stock compression I would keep stock heat range plugs and just check them out make sure every thing is good. If running more boost, more compression or have higher iat's then you can start stepping down to colder heat ranges as needed for the setup. Also the go to gap has become .032, I am a believer in only running the tightest gap you have to on the setup to run good and not get blowout. Car runs smoother with amore complete burn with the wider you can stay on the gap. So if your running 8psi 450hp try a gap in the .034-.036 range and see how she runs. And just gap down as necessary for the setup.

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JeremyH said:

And I still run 93 with them as well. I run 12psi on 93 with them and 16psi with e85 760rwhp. Keep in mind my setup has ambient iat;s at that power level and motor is 9:1 compression. When I pulled out the ht1's after a year or so to put in a fresh set they all looked great still so stock heat range at .028 gap seems to be appropriate for my setup.

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06monera96 said:

Possibly you're running out of pump...

When I was pushing 401hp/395tq I was at 89% duty cycle.. with a Walbro 400LPH pump.
What are you making for power?

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Heaten m90 said:

Stock wiring?? Im making 450whp on e85 with less duty cycle with the walbro 400

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PaxtonGT05 said:

Update:

Installed a Walbro 400, and along with the wire upgrade duty cycles are looking great, only 72% at WOT. Still running lean. I've now got Lito on the case, he seems to think it is a tuning issue. I really hope it is, pretty sick of chasing parts. Should have had Lito look at it at the beginning like a few suggested, I just thought the vendor that sold the "complete kit" with the "custom tune" included would have had it together a bit better. We will see what happens when Lito does his stuff. Fingers crossed it's a tuning issue and not some mechanical gremlin still sight unseen.

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