Wrong....we have had several members on the forum solve lean-out issues at high boost and HP by swapping the stockers for the walbros.baadal said:dual stockers is the best, especially if running two power aders
I don't really see how that says too much unless that was a brand new stock one that went out on you. Comparing a 40k mile+ stock supra pump to a brand new Walboro with 0 miles on it isn't really a good comparison as far as durability under high hp applications....unless you have run very high hp for 40k+miles on your walboros...then I guess it would be a pretty good comparison.SupraGator said:My stock pump died causing me to run lean on high boost. I now have two new walbros.
chevyeater-on-sf said:Various fuel pumps tested against the mk4 and mk3 Supra stock pump (mk3 is the "stock pump")* :
It is easy to see the Walbro is clearly the highest flowing unless you run close to 100 psi fuel pressure.
Doesn't the mk4 use the same type of fuel pump resistor setup as the mk3 (sorry I'm a mk3 guy)? A fixed resistor that the fuel pump power is routed thru under cruise? If it is a fixed resistor it isn't going to deliver the same voltage to the Walbro as it would to the stocker. Also, most manufacturers besides Toyota run their fuel pumps at unregulated B+ I'd think Walbro designed thier pump for "most" cars and not Toyotas specifically. It may not pump well at low voltage at all. :scratch:
*Credit for the chart and more info can be found on www.supras.nl
Ken,KenHenderson said:Its not ready for prime time yet, but one of our members on [email protected], whose also an EE and worked with Russ Collins of RC Engineering, tested the stockers against Walbros and found exactly the opposite. According to the tests, the stockers outflowed the Walbros and it wasn't that close.
Its been proven, IMO, that you'll be fine anyway you go. There have been far too many big-power Supras with the stockers that haven't leaned out for me to believe that those who had lean problems were the norm and not an aberration (s).
Yup. 6 or 8 gauge wire from the battery back to the pumps, controlled by a relay.chevyeater-on-sf said:Yeah, from that link Lagtime put up it looks like the stock mk4 pump really responds to voltage. The chart I put up is all at 12v. Seems like more reason to try to minimize voltage drop on the way back to the pump.