carl0s Posted June 9, 2004 Share Posted June 9, 2004 I'm aware of the 12v Pump mod, and the idea. I've noticed that my car uses quite a lot of juice when on boost, but seems pretty good off boost. Turbo 1 starts to spool just after 1800rpm for me, which in my auto equates to about 55mph. 70mph is about 2150rpm. Does anybody know if the switch from 9v to 12v happens as soon as boost occurs, or is it for example only when a certain amount of boost is present? If it is the former, I'd be interested in trying to keep the pump down at 9v until say 3500rpm and see if this has any effect on fuel economy. thoughts anybody? Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted June 9, 2004 Share Posted June 9, 2004 i wouldnt try and keep it down. Toyota designed it best for the car, you dont want to start running lean!! might cause engine problems and big bills for a little save in fuel! Link to comment Share on other sites More sharing options...
carl0s Posted June 9, 2004 Author Share Posted June 9, 2004 I suppose what I really need to know is if the engine runs rich at very low boost. Link to comment Share on other sites More sharing options...
lovatt Posted June 9, 2004 Share Posted June 9, 2004 i have the 12v mod and as far as i know it keeps the pump running at 12v all the time (when the engine is running) Link to comment Share on other sites More sharing options...
carl0s Posted June 9, 2004 Author Share Posted June 9, 2004 Originally posted by lovatt i have the 12v mod and i as far as i know it keeps the pump running at 12v all the time (when the engine is running) and does this not cause the engine to run rich when it's off boost (when it should run the pump at 9v)? I suppose maybe it's all controlled by the injectors? Link to comment Share on other sites More sharing options...
lovatt Posted June 9, 2004 Share Posted June 9, 2004 im out of my depth here, somebody will know though, ask me one on bodywork Link to comment Share on other sites More sharing options...
carl0s Posted June 9, 2004 Author Share Posted June 9, 2004 Originally posted by lovatt im out of my depth here, somebody will know though, ask me one on bodywork I've been offered both a Silver and a Black J-spec bumper to replace my uk spec one (got rid of headlamp washers). What I want to know is, does the bumper *have* to be painted on the car, or can I have it done while it's off? Storm Blue paint BTW. There ya go Link to comment Share on other sites More sharing options...
lovatt Posted June 9, 2004 Share Posted June 9, 2004 pm'd Link to comment Share on other sites More sharing options...
Dragonball Posted June 9, 2004 Share Posted June 9, 2004 Originally posted by carl0s Does anybody know if the switch from 9v to 12v happens as soon as boost occurs, or is it for example only when a certain amount of boost is present? This switches at positive boost or WOT to give the pump more oomph! You probably dont need it with a stock set up - however if upgrading there is still some debate The question has been whether the upgraded Walbro pump (which losses 20% effeciency for every one Volt drop from 12V) works better with or without the 12V mod being undertaken This has never been proved - but I for one have hedged my bets and done the mod - and added a relay to ensure the fuel pump only works when engine is running (so will stop in case of accident etc etc) You should have this relay - and I have some of Emins prepared and here! If trying to improve fuel figures - use the right foot - just take it up by 5% when on the accelerator - presto 30MPG (mind you - you will be holding up tractors!0 Link to comment Share on other sites More sharing options...
Paul Laing Posted June 9, 2004 Share Posted June 9, 2004 Is this 12v mod any good on a UK spec? Link to comment Share on other sites More sharing options...
carl0s Posted June 9, 2004 Author Share Posted June 9, 2004 see Ian C's post about it here: http://www.mkivsupra.net/vbb/showthread.php?s=&threadid=21930&perpage=15&pagenumber=1 Link to comment Share on other sites More sharing options...
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