Guest Atomaton Posted September 6, 2004 Share Posted September 6, 2004 Hi guys, Anyone know if the 12V fuel pump mod is a mandatory requirement or advisable when running de-cat with a restrictor ring? Recently installed a walbro... Was reading 0.7 bar before de-cat and now peaking at 1 bar. Car seems to be running great apart from loss of traction!! cheers Quote Link to comment Share on other sites More sharing options...
dandan Posted September 6, 2004 Share Posted September 6, 2004 I wouldn't bother personally. Switch to 12v occurs as soon as positive boost is produced (on a J spec) so no real need. Walbro draws less current so no need to replace factory wiring with dedicated feed for that reason, and it'll help preserve pump life (slightly) and reduce noise at idle too. Quote Link to comment Share on other sites More sharing options...
merckx Posted September 6, 2004 Share Posted September 6, 2004 I did an extensive search the other day, you have already done the right thing by fitting the Walbro. The pump on the Uk car pumps more fuel than the J spec car, so only worth ugrading on the J spec. The 12v mod doesn't apppear to be that popular or necessary. Quote Link to comment Share on other sites More sharing options...
Guest Atomaton Posted September 6, 2004 Share Posted September 6, 2004 ta m8, I did notice it was slightly louder than the stock item.. Quote Link to comment Share on other sites More sharing options...
dude Posted September 6, 2004 Share Posted September 6, 2004 The walboro pumps significantly more fuel as voltage increases , as for pump life it may well only last 15 years instead of 20 !!! Dude:flame Dev Quote Link to comment Share on other sites More sharing options...
carl0s Posted September 7, 2004 Share Posted September 7, 2004 From the "Technical Bods" sticky thread at the top of this forum, by Ian C: Name: 12v fuel pump mod Also known as: The fuel pump mod What is it? The stock fuel system of the Supra has a switched power fuel pump. Anything off-boost and it runs the pump at 9v. Anything on-boost and the ECU switches to running the pump at 12v. This is probably for pump longevity and maybe some NVH reasons. The 12v mod is where you wire the pump to always run at 12v in the belief this will improve your fuelling at high boost high revs. Pros A warm fuzzy feeling that you've improved your fuelling at high revs high boost for £0 Cons It doesn't affect your fuelling one jot. At best, running the pump at a higher voltage when off boost merely shortens it's life a bit. It could also affect fuelling and drivability off-boost due to overpressurising the fuel system. As the pump switches to 12v as soon as you get on boost, this mod isn't going to change the behaviour of the fuel system when positive boost is occuring in the slightest. Quote Link to comment Share on other sites More sharing options...
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