Matt Harwood Posted July 17, 2007 Share Posted July 17, 2007 Im one step ahead of you. Actually he pm'd me to offer advise. I wouldnt even know where to buy a relay! Jon, the high idle issue is just an AEM quirk. After the AEM has lost power, for the first time it's started, it will idle high. Turn it off once, and it'll return to normal. Regarding the fuel pumps, ideally, it should have two power wires going in, and two earth wires coming out, (or commoned to a suitable point). It sounds like Michel is pointing you in the right direction with the use of a relay. Quote Link to comment Share on other sites More sharing options...
Pig Posted July 17, 2007 Author Share Posted July 17, 2007 Jon, the high idle issue is just an AEM quirk. After the AEM has lost power, for the first time it's started, it will idle high. Turn it off once, and it'll return to normal. Ok...... well that means the AEM has lost power. Would that mean my map could have been lost? Or just that the battery has been disconnected? Quote Link to comment Share on other sites More sharing options...
wkdtime Posted July 17, 2007 Share Posted July 17, 2007 Ok...... well that means the AEM has lost power. Would that mean my map could have been lost? Or just that the battery has been disconnected? Map will not have been lost, may be a bad connection somewhere and power was lost for a split second or so. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted July 17, 2007 Share Posted July 17, 2007 Usually disconnection of battery or flat battery will cause it. Bad connections are a possibility.. Quote Link to comment Share on other sites More sharing options...
michel lane Posted July 17, 2007 Share Posted July 17, 2007 Do you know (and can you say) who did the previous work Michel? YOU GOT 1 GUESS ........The clients will be posting some feedbacks later. Quote Link to comment Share on other sites More sharing options...
Alex Posted July 17, 2007 Share Posted July 17, 2007 Jon, I'd expect TDI disconnected the battery when they were inspecting it...to make sure they didn't blow anything up Quote Link to comment Share on other sites More sharing options...
dandan Posted July 17, 2007 Share Posted July 17, 2007 YOU GOT 1 GUESS ........The clients will be posting some feedbacks later. Say no more. It's a damn shame that quite a few members' cars seem to have been completely fcuked up by these guys. I don't know both sides of any of the stories but what's flying around on the forums right now makes for very unpleasant reading. Quote Link to comment Share on other sites More sharing options...
suprafan72 Posted July 17, 2007 Share Posted July 17, 2007 Are twin pumps the answer?? This surely add's to the complicaton of things? Why not just fit one big pump to cope with it all? Quote Link to comment Share on other sites More sharing options...
dandan Posted July 17, 2007 Share Posted July 17, 2007 One Walbro 341 or 342 arguably has enough flow (at up to 1.4bar of boost - something like 60psi of fuel pressure) for about 600bhp at the flywheel. This is with uprated lines filter and rail (not necessarily the case with the kind of back pressures that may be generated by the stock lines/rail to get 60psi and the required flow for that power level). Quote Link to comment Share on other sites More sharing options...
suprafan72 Posted July 17, 2007 Share Posted July 17, 2007 One Walbro 341 or 342 arguably has enough flow (at up to 1.4bar of boost - something like 60psi of fuel pressure) for about 600bhp at the flywheel. This is with uprated lines filter and rail (not necessarily the case with the kind of back pressures that may be generated by the stock lines/rail to get 60psi and the required flow for that power level). Agreed, I just think that in this case for the big power buys that surely investing in a bigger pump that can handle high pressure/flow rates would be allot less complicated than going with twins... Quote Link to comment Share on other sites More sharing options...
TLicense Posted July 17, 2007 Share Posted July 17, 2007 It's finding a single larger pump that will fit inside the tank that's a problem. Quote Link to comment Share on other sites More sharing options...
Alex Posted July 17, 2007 Share Posted July 17, 2007 It's finding a single larger pump that will fit inside the tank that's a problem. Walbro's react well to increased voltage...if you can find a way to boost the voltage it receives you'll increase your head room. The Bosch 044 is about the only bigger pump I can think of, don't think many people have tried mounting them in tank - as they are so bloody big Quote Link to comment Share on other sites More sharing options...
suprafan72 Posted July 17, 2007 Share Posted July 17, 2007 Walbro's react well to increased voltage...if you can find a way to boost the voltage it receives you'll increase your head room. The Bosch 044 is about the only bigger pump I can think of, don't think many people have tried mounting them in tank - as they are so bloody big Isn't it lucky i have an aftermarket fuel tank.. Thats the particular pump i have in mine. :-) Quote Link to comment Share on other sites More sharing options...
Alex Posted July 17, 2007 Share Posted July 17, 2007 Isn't it lucky i have an aftermarket fuel tank.. Thats the particular pump i have in mine. :-) Yours seems particularly well put together, and it even made the sort of horse power it should...which is pleasantly surprising as 99% of Dan's maps have under performed in the HP dept. Quote Link to comment Share on other sites More sharing options...
suprafan72 Posted July 17, 2007 Share Posted July 17, 2007 Yours seems particularly well put together, and it even made the sort of horse power it should...which is pleasantly surprising as 99% of Dan's maps have under performed in the HP dept. Well i'm hoping it is.... And was originally put together by a tuning company in Japan with all the "Right" Mods.... with huge potential.... I'll be at JAE on Sunday so hope to see u arround then. Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 17, 2007 Share Posted July 17, 2007 The company in question's workmanship is ridiculous, are they still traders on here? Why do people still use them...do they charge peanuts? Quote Link to comment Share on other sites More sharing options...
Kranz Posted July 17, 2007 Share Posted July 17, 2007 If I understand this right, Jon's problem may be the twin pumps wired into the original single pump power supply. At low power (up to low boost) when the pump(s) are running at low voltage the fuel supplied is sufficient, but when the ECU switches the pumps up to full voltage there isn't enough power available through the small guage wiring to power both the pumps so the engine suffers fuel starvation? The answer is to fit a relay powered by the original power supply and run a big fat power wire from the battery to the relay, then to the pumps. Is this about right? Quote Link to comment Share on other sites More sharing options...
tooquicktostop Posted July 17, 2007 Share Posted July 17, 2007 If I understand this right, Jon's problem may be the twin pumps wired into the original single pump power supply. At low power (up to low boost) when the pump(s) are running at low voltage the fuel supplied is sufficient, but when the ECU switches the pumps up to full voltage there isn't enough power available through the small guage wiring to power both the pumps so the engine suffers fuel starvation? The answer is to fit a relay powered by the original power supply and run a big fat power wire from the battery to the relay, then to the pumps. Is this about right? If this is the case then my new twin pumps may have been fitted in the same way as it was the same garage and this perhaps led to the DET in the engine failure ? Quote Link to comment Share on other sites More sharing options...
Pig Posted July 17, 2007 Author Share Posted July 17, 2007 If this is the case then my new twin pumps may have been fitted in the same way as it was the same garage and this perhaps led to the DET in the engine failure ? Wouldnt suprise me. The det is VERY sudden and was fine untill last use when it was sat around for a while. Could it be something that comes about completly randomly? Quote Link to comment Share on other sites More sharing options...
redtwinturbo Posted July 17, 2007 Share Posted July 17, 2007 If I understand this right, Jon's problem may be the twin pumps wired into the original single pump power supply. At low power (up to low boost) when the pump(s) are running at low voltage the fuel supplied is sufficient, but when the ECU switches the pumps up to full voltage there isn't enough power available through the small guage wiring to power both the pumps so the engine suffers fuel starvation? The answer is to fit a relay powered by the original power supply and run a big fat power wire from the battery to the relay, then to the pumps. Is this about right? This does seem like it would make sense but wasn't it running ok before this problem suddenly started? If this is the problem I would have thought the symptoms would have been experienced since the pumps installation Quote Link to comment Share on other sites More sharing options...
michel lane Posted July 17, 2007 Share Posted July 17, 2007 If this is the case then my new twin pumps may have been fitted in the same way as it was the same garage and this perhaps led to the DET in the engine failure ? i suggest you have a careful think about your fuel system before tuning the next engine. Quote Link to comment Share on other sites More sharing options...
Sharpie Posted July 17, 2007 Share Posted July 17, 2007 These are sad times indeed Quote Link to comment Share on other sites More sharing options...
Alex Posted July 17, 2007 Share Posted July 17, 2007 Dean, It may have done but the Dan should have been monitoring the fuel pressure and listening for det...but yes the fuel pumps being rigged up incorrectly could lead to 2 claims Quote Link to comment Share on other sites More sharing options...
bromy Posted July 17, 2007 Share Posted July 17, 2007 Could something be rigged up to prevent this i.e a inline pressure switch on the entry to the rail and connected somehow to the ignition to cut the spark or am I way off? Quote Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted July 17, 2007 Share Posted July 17, 2007 I think the idea is the 2 fuel pumps have seperate power feeds so if one fails the other keeps going. ...well thats my none technical view. Quote Link to comment Share on other sites More sharing options...
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