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"Thats called a wire tap. Its for logging my fuel pressure. works perfect."
I am fully aware of what it is and what happens when it's used. We see that kind of stuff on a daily basis.
That, and 6 different gauge/color wires complete with multiple butt splices in a 6' run.
Nope. 10 gauge from the alternator to the relay, 10 gauge from the relay to the pump. 10 gauge ground.
Confirmed by checking voltage at the pump at idle at WOT. 13.7V at WOT without the BAP.
"Thats called a wire tap. Its for logging my fuel pressure. works perfect."
I am fully aware of what it is and what happens when it's used. We see that kind of stuff on a daily basis.
That, and 6 different gauge/color wires complete with multiple butt splices in a 6' run.
Your right, I'll change the color of the wiring. That'll fix my fp issue.
I'll make a bet with you, I'll change whatever you like with my wiring and I bet $100 it wont make a difference. I'll PayPal you 100 cash if the issue goes away.
Im a little curious why the twin 255's had the same issue if the 525 is weak....but I did suggest installing the BAP in the other thread .
Yes you did suggest that
The 255s, initially had about 10psi more pressure than the 535, but pressure on both setups dropped by the end of the pull.
From the people I talk to and what I read, Both setups are supposed to be good for 700 on e85.
The BAP tells me the regulator, stock Corvette rails, fuel lines, fuel filter are working.
The wiring has been redone, checked with a meter and checked out good. That tells me I'm outta pump. Either the pump is weak or I'm making alot more power than I thought I was. I had it on the dyno so I know what its putting down.
I didn't think the 535 was good to 700 without the BAP.? How far will the BAP go, you think ?
Chris Johnson is who I bought the pump from He claims 700-725rwhp by itself.
I'm not sure how far a BAP will take it but through out this process, I've been talking to a guy that runs a 525 pump with a BAP and hes at 820/800. That's on e85 with bosch 1000cc injectors. Stock z06 rails 8an feed, 6an return.
Another guy I was talking to has the 535 pump and 80lb injectors and says hes at 750.
"Your right, I'll change the color of the wiring. That'll fix my fp issue."
No suggestion that your wire colors are an issue. I made reference as to what we find in our shop.
As for the Scotchlok....
I made a suggestion for a test to confirm the rails were not the issue. Do with that whatever, I could care less.
Yes - the BAP did not solve the issue like I originally thought. Yesterday, I did a wot pull to 6000 and fuel pressure dropped to 53psi and I was at 13psi of boost.
Last edited by 30th t/a; Jun 10, 2023 at 11:44 AM.
Are you just checking the voltage or doing a voltage drop test? I ask because there is a big difference between the two and most people don't even know what the second one is.
Are you just checking the voltage or doing a voltage drop test? I ask because there is a big difference between the two and most people don't even know what the second one is.
I checked voltage at WOT and voltage drop at idle. Checking voltage,I just attach the negative lead to the negative on the battery and the the positive on the power wire, in the back of the connector that goes into the bulkhead. Voltage stayed at 13.7.
Voltage drop power readings were .50-.56, Voltage drop negative readings were .29-.32
Putting 20psi of compressed air to the regulator, I Found this today. After I wrapped the screw with teflon tap, I took it for a 4th gear wot pull, 5900 rpm seeing 12.9psi of boost, fuel pressure was at 60.34psi.
Compared to the other day, 4th wot pull, 5900 rpm boost was 13.1 and fuel pressure was 52.86psi.
Last edited by 30th t/a; Jun 11, 2023 at 08:26 PM.
That hose clamp is way too big for that vac line. The clamp, when screwed down that far, will distort and not apply even pressure all around the hose. Maybe try the soapy water there, too.
That hose clamp is way too big for that vac line. The clamp, when screwed down that far, will distort and not apply even pressure all around the hose. Maybe try the soapy water there, too.
Agreed. Im doing that next.
The vacuum line fits perfectly on the intake manifold port but not the hose fitting supplied with the regulator. That fitting that came with the regulator is very thin.
That hose clamp is way too big for that vac line. The clamp, when screwed down that far, will distort and not apply even pressure all around the hose. Maybe try the soapy water there, too.
Agreed. Im doing that next.
The vacuum line fits perfectly on the intake manifold port but not the hose fitting supplied with the regulator. That fitting that came with the regulator is very thin.
In the "FWIW" dept, I work on turbo Buicks, and we use the small black zip ties on all vac hoses.
We use a small flush edge wire cutter to snip the excess tail on the zip tie. That cuts it flush with the slip end of the tie, so you don't get the famous "aw ****" cuts that zip ties are known for.
These work well...
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