Hey John, greetings from the ATL.
Phil Panas has got the dual Walbro set-up and when I rode with him I could barely hear the pumps running. Not that I was paying attention to the pumps and how loud they were, but had it been a "whining" external pump I'm sure that would have gotten my attention. Also Mark Shaw (if you remember him) has gone single and is also running the same set-up. I think with the engine running, the sound of a tuned exhaust and the music playing it'll be hard to hear the pumps. Also I believe these pumps do flow a little better than stock at higher pressures.
Congrats John. I've been following your single turbo project. I ordered the same fuel kit, and just waiting for it to arrive!! I only went 7200cc though. Good luck. Let me know how everything goes.
Congrats John. I've been following your single turbo project. I ordered the same fuel kit, and just waiting for it to arrive!! I only went 7200cc though. Good luck. Let me know how everything goes.
I will be posting pictures of johns new setup on www.utahracing.com, as soon as we get all the that parts back from polishing, coating and I finish the install. Its going to be a beast… John and I also got the new 4000 stall Torque Converter from Precision Industries.
I think the OEM pumps are a proven solution and you know you won't get any noise. I have never asked what HP they are good to b/c I only planned on 720's, but I assume it would last well up into the 900's.
I've got dual Walbros and although Dusty @ MVP said they were not noisy at idle they are very clearly audible. It's just like a serious alternator whine. My trunk is completely empty and I think some sound dampening material would help.
On the other hand someone also told me that two stock pumps at 12V also are not entirely inaudible.
I will be posting pictures of johns new setup on www.utahracing.com, as soon as we get all the that parts back from polishing, coating and I finish the install. Its going to be a beast… John and I also got the new 4000 stall Torque Converter from Precision Industries.
I have 2 stock pumps with no fuel pressure drop even while running 31psi on a T78 with 720CC injectors maintaining a 12.8:1 A/F ratio.
I didn't see any hint of a pressure drop so I would guess it can do even richer A/F ratios with 720s, or support larger injectors and even NOS with a large single turbo.
I think the OEM pumps are a proven solution and you know you won't get any noise. I have never asked what HP they are good to b/c I only planned on 720's, but I assume it would last well up into the 900's.
Dual Walbros aren't much noisier (10% I'd guess), and they flow far more than the oem pumps, especially at high pressures. Lastly (and possibly most importantly) they fit perfectly side-by-side in the bottom of the fuel tank's center resevoir. Dual oem pumps have to be mounted with one slightly higher and in front of the other, which means that at a very low fuel condition, one pump could suck air, when the other was sucking fuel.
Dual Walbros aren't much noisier (10% I'd guess), and they flow far more than the oem pumps, especially at high pressures. Lastly (and possibly most importantly) they fit perfectly side-by-side in the bottom of the fuel tank's center resevoir. Dual oem pumps have to be mounted with one slightly higher and in front of the other, which means that at a very low fuel condition, one pump could suck air, when the other was sucking fuel.
Phil, I believe that test was flawed somehow. Maybe the OEM pump drew too much current and there was a voltage drop, or maybe the pump was worn out (if thats possible). I've seen numerous tests (and actual first hand experience) on the internet that claim that the stock pump flows more than the Walbros, especailly at higher fuel pressures.
Maybe if they upped the pressure more the Walbro would catch up.
That being said, I ordered 2 Walbros because they draw much less current (Can use the stock wiring, which is a 30 amp fuse), probably do work better at high fuel pressures (counting backpressure in the lines, mine will likely see more than 73 psi), and for the fitment reason you mentioned. Plus, both of them w/ socks and everything are only a little more than another stock pump.
Are you guys using a sensor ground for your bcc or chassis ground? I don't want to cut my harness so came up with this rough contraption. Something so simple yet 14-15 lbs boosts cuts every time. I started at 4.30v, kept turning it down after pulls to see if that was the case and nope still...
Will be installing 272 BC cams, springs, retainers, keepers and of course those pesky oem seals.
Still a bit confused on when I need to put motor at TDC since I am doing the "rope trick" does this matter?
So would you do shimless buckets like this?
Please correct if wrong.
1.Remove the...
So my odometer stopped working and i have resoldered it 2 times and everytime, it starts counting for about 5km and then stopps again. I have done the splice mod on the connector on the back also have tried putting it back to original and also tried removing my speedo converter but it didnt...
I came across asking myself today, do you need a igniter when you go to a aftermarket ECU and Harness? I noticed my friend is running a MOTEC and does not have one for his car.
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