bolarbag Posted December 4, 2007 Share Posted December 4, 2007 What is the difference between the Aeromotive Fuel Pressure Regulators? There is a Red/Silver one and a Black/Red One....anybody explain? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 4, 2007 Share Posted December 4, 2007 IMO they are both junk, but the colour is different Just get a Bosch one if you just MUST interfere with the stock one The Bosch Motorsport ones do exactly what they should do, perfectly. But so do the stock ones... Quote Link to comment Share on other sites More sharing options...
magictorch Posted December 5, 2007 Share Posted December 5, 2007 I thought the Aeromotive FPR was of a good quality? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 5, 2007 Share Posted December 5, 2007 Some people like them, I think they are junk, to be honest. OE makes are far more reliable than the aftermarket stuff. Why not just use the stock one? Quote Link to comment Share on other sites More sharing options...
bolarbag Posted December 5, 2007 Author Share Posted December 5, 2007 On Dual Walbro's and 720CC injectors? Is the stock one even adjustable? What size are the lines that lead to it?(I've been too lazy to look) Quote Link to comment Share on other sites More sharing options...
TLicense Posted December 5, 2007 Share Posted December 5, 2007 That's exactly the reason you can't use the stock one.... It's not adjustable, and the lines are too small. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 5, 2007 Share Posted December 5, 2007 Why would it need to be adjustable? Just map to the stock FPR pressure. The return line need not be bigger than stock unless you are flowing a massive amount of fuel from a huge pump? Quote Link to comment Share on other sites More sharing options...
TLicense Posted December 5, 2007 Share Posted December 5, 2007 The problem is that there is no standard for the base pressure that injectors are flow tested at. So unless you're lucky enough to have yours flow tested at the same range as the stock set-up then you're taking a flyer on whether or not the injectors you've got are going to be man enough at the top end. OK not the end of the world, as you would potentially just need to buy a different set of injectors, and get the car re-mapped if it were a problem. But if it's possible to get a decent adjustable FPR, then you can set the base pressure to the same the injectors were set to when they were cleaned and tested, and potentially save a load of cash and hassle. Besides, the stock ones aren't actually that great. The tolerance for them is 7 psi. Probably fine when you're only running 7-10 psi of boost with an ECU that will richen the mixture up as required when off boost, but with a rudimentary aftermarket ECU and double the boost, I'm not so sure it's accurate enough. When I tested the Aeromotive after I took the P.O.S. FSE off my car, it was repeatable to well within 1 psi. The only concern I do have over them is how they react with higher temps, which I'm still investigating in relationship to a (more likely) injector control problem. Quote Link to comment Share on other sites More sharing options...
dandan Posted December 6, 2007 Share Posted December 6, 2007 7psi tolerance on a stock fpr!!!!!!!! That sounds terrible - on 3bar differential fuel pressure that equates to +/-8% on your fuelling.........kaboom! Was this on a new regulator Tony or a "suspect" one? Was this variance temp related or just random fluctuations over a period of time? Also when I have had injector tested in the past I have always set the test pressure Quote Link to comment Share on other sites More sharing options...
TLicense Posted December 6, 2007 Share Posted December 6, 2007 The 7 psi is the tolerance that Toyota deem acceptable. The temperature thing is more with the Aeromotives, and as of yet is still just a theory. I wouldn't like to say it's definitely a problem without some imperical evidence to back it up.... Quote Link to comment Share on other sites More sharing options...
dandan Posted December 6, 2007 Share Posted December 6, 2007 OK that's a different story Tony. If a batch of let's say 1000 regulators carry 7psi tolerance between them then no problem (for the aftermarket mapper). If the tolerance during service on one individual regulator is 7psi then that is bad news. Quote Link to comment Share on other sites More sharing options...
b_have Posted December 6, 2007 Share Posted December 6, 2007 The 7 psi is the tolerance that Toyota deem acceptable. The temperature thing is more with the Aeromotives, and as of yet is still just a theory. I wouldn't like to say it's definitely a problem without some imperical evidence to back it up.... Thats why I have always mounted my Aeromotive away from the engine (attatched to the bulkhead) to escape the huge heatsoak and vibration. Quote Link to comment Share on other sites More sharing options...
TLicense Posted December 6, 2007 Share Posted December 6, 2007 OK that's a different story Tony. If a batch of let's say 1000 regulators carry 7psi tolerance between them then no problem (for the aftermarket mapper). If the tolerance during service on one individual regulator is 7psi then that is bad news. What I mean is that when Toyota test the base pressure, they have a tolerance band of 7 psi. So the regulator only has to be repeatable to within 7 psi, and it's ticked off as being fine. I see what you mean about batch tolerance, but the problem is there isn't any differential between the 2 for Toyota to see them as being fine. Quote Link to comment Share on other sites More sharing options...
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