Delberts Wallet Posted November 24, 2006 Share Posted November 24, 2006 How do I go about checking my fuel pressure? I've recently gone from 1600 to 1800 (keeping the 1600 SS ECU) and fitted an adjustable FPR to up the fuel pressure. The problem is that I don;t know what pressure it is set to and even set at Max it is running lean. Also, does anyone know what the reading should be on the Lambda for a correct mixture? Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Bob Corb Posted November 24, 2006 Share Posted November 24, 2006 Normally a rover FPR is set to 3 Bar. If you increase the airflow (=> fuel flow) by a factor of 1.12 (1.8 / 1.6) then dont you need to increase the dP on the injector by 1.12² = 1.26 => 1.26 * 3 = 3.86Bar? You could try blowing the reg open with compressed air? Otherwise borrow an Innovate LM-1 and take it for a blast and check your AFR drops to about 13 full load and down to 11 near peak power? A friendly rolling road would be the best place to set it up. If you try to adjust the fuel pressure at idle you will find that the pressure wont directly affect the AFR as the ECU will constantly be trimming the pulse rate to keep at 14.5 Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 24, 2006 Author Share Posted November 24, 2006 Bob, I had it on a rolling road yesterday and it never dropped below 14.5 I'll remove the adjustable FPR and get it checked. I take it I just apply an air hose in the inlet side of the reg and monitor the pressure? Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Bob Corb Posted November 24, 2006 Share Posted November 24, 2006 Yeah, its a bit crude but its a starting point. Did the guys at the rolling road look at all concerned about running over 14.5 everywhere? They should have. You weren't giving it any load I hope? (I've just done a wee calc here at work and for a given restriction the flow is indeed proportional to dp²) Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 24, 2006 Author Share Posted November 24, 2006 Yes, the guys at the RR were very concerned about the AFR which is why we aborted. I could really do with checking the actual fuel pressure tho. Can anyone recommend a way of doing this? Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Peter T Posted November 24, 2006 Share Posted November 24, 2006 I have a kit that can do this. I am in surrey, any use? R500 Mango Madness Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 24, 2006 Author Share Posted November 24, 2006 Peter, thanks for to offer but I'm up nr Leicester. Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Peter T Posted November 24, 2006 Share Posted November 24, 2006 Ok so a bit far. You can see if you have a fuel specialist near you who could check it for a small fee? R500 Mango Madness Link to comment Share on other sites More sharing options...
k.russell Posted November 24, 2006 Share Posted November 24, 2006 Gareth, not sure what the fuel regulator is like on your car but i have a small gauge screwed into my regulator permanently to read the pressure. kevin R black-ali HPC Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 24, 2006 Author Share Posted November 24, 2006 Kev, the FPR is a weber one with top and bottom fixings and thats all. There is no place to fit a gauge Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
John Howe Posted November 24, 2006 Share Posted November 24, 2006 I visit my local friendly garage and use their gauge in situ JH Deliveries by Saffron, the yellow 230bhp Sausage delivery machine Link to comment Share on other sites More sharing options...
oilyhands Posted November 24, 2006 Share Posted November 24, 2006 I have a gauge that can be fitted in series, set the FP to 4 bar... Oily Link to comment Share on other sites More sharing options...
Bob Corb Posted November 24, 2006 Share Posted November 24, 2006 Ah ha, I wasn't far off then! Link to comment Share on other sites More sharing options...
oilyhands Posted November 24, 2006 Share Posted November 24, 2006 Pretty much spot on Bob... some of the EU2 1800SS engines used the 1600SS ECU with the FP set to 4 bar using an adjustable FPR. Oily Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 25, 2006 Author Share Posted November 25, 2006 I've had the pressure checked and it is set to 4bar. Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted November 25, 2006 Area Representative Share Posted November 25, 2006 Gareth, perhaps a daft question, but did you/have you got it connected the right way round? I did witness an adjustable pressure regulator not working because it was conected back to front, a couple of years ago! (that car has a Stack dash, and a fuel pressure sender connected to the Stack - it worked a treat, once it was connected the right way!) Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 25, 2006 Author Share Posted November 25, 2006 Yes it is connected the correct way. I think. Didn;t have any instructions with it so connected using logic, ie Big pipe=In small pipe=Out Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 25, 2006 Author Share Posted November 25, 2006 I'm starting to think that its due to the fact that I'm running a ported head and 52mm TB or the RR's equipment is out? May take it somewhere else next week and get a second opinion. Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
CageyH Posted November 25, 2006 Share Posted November 25, 2006 Where can I get a 4 bar pressure regulator, or an adjustable regulator that fits the k series fuel rail from? I reckon I may need one on my VHPD engine... Only dead fish go with the flow.... Link to comment Share on other sites More sharing options...
oilyhands Posted November 25, 2006 Share Posted November 25, 2006 Demon thieves, or you can squeeze the current one in a vice... Oily Link to comment Share on other sites More sharing options...
Peter T Posted November 25, 2006 Share Posted November 25, 2006 I have a new adjustable FPR. JIc fittings made bt TWR. £50. R500 Mango Madness Link to comment Share on other sites More sharing options...
CageyH Posted November 26, 2006 Share Posted November 26, 2006 Peter, Is it a straight swap? Only dead fish go with the flow.... Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 26, 2006 Author Share Posted November 26, 2006 Any ideas as to what could be causing it to run lean? Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
Mr Locust Posted November 26, 2006 Share Posted November 26, 2006 Air leaks. Have you got all the breather pipe on properly etc.? Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
Delberts Wallet Posted November 26, 2006 Author Share Posted November 26, 2006 Good point Ian but would that not cause Idle issue's too? I'll take a look tomorrow. Gareth Blue and Carbon 6 Speed Supersport with new wheels Link to comment Share on other sites More sharing options...
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