Discussion
FSE seem the standard choice (non rising rate) just bare in mind your making an impact on the whole fueling curve and there is only so much the O2 sensors can pull out of the fuel table low down but after about 3.5k RPM its open house anyway 
many have got reasonable results doing this it all depends on your engines fueling needs
many have got reasonable results doing this it all depends on your engines fueling needs 
You really dont want to mess around with the fuel pressure unless you are trying to overcome lean running on the 5 ltr under full load as a work around , the standard is normally just fine, especially as all the info and software tools you need to remap the 14CUX are now freely available, so you can do the job properly. You dont want a rising rate regulator on the 14CUX, as it already has full throttle enrichment built into the ECU's programming, and adding a rising rate will simply add extra fuel you don't need. I assume whoever set up Daz's ECU will have taken the shifting fuel pressure into account when the (Emerald?) ECU was mapped
blitzracing said:
You really dont want to mess around with the fuel pressure unless you are trying to overcome lean running on the 5 ltr under full load as a work around , the standard is normally just fine, especially as all the info and software tools you need to remap the 14CUX are now freely available, so you can do the job properly. You dont want a rising rate regulator on the 14CUX, as it already has full throttle enrichment built into the ECU's programming, and adding a rising rate will simply add extra fuel you don't need. I assume whoever set up Daz's ECU will have taken the shifting fuel pressure into account when the (Emerald?) ECU was mapped
Its not rising rate ,works exactly the same as the OE one .Its been fitted for years when i had trouble with the 14CUX The only thing that worries me if it fails or for some reason the pressure changes ,It will knock the whole map out .
Its set at just over 2.6 bar with the vac pipe removed.
Edited by SILICONEKID345HP on Friday 13th February 18:00
Edited by SILICONEKID345HP on Friday 13th February 18:01
Bobby Shaftoe said:
Wasn't a big fan of fse/malpassi regulator, it kept drifting out of tune on mine and wouldn't give the same fuel pressure from one day to the next, i asked the same question over on the V8forum and it seems quite a few had the same problems.
I took it apart and it seemed fairly s
te quality compared to regulators from weber/aeroquip/AEM etc. The rubber diagphram was really thin and stretched which probably caused the problems. Got a weber adjustable fitted now and no problems in three odd years.
Just a thought but if you increase fuel pressure, won't the ecu start logging rich mixtures in closed loop, and then start pulling fuel with the short and long term fuel trims which will lean out your mixture again? I thought the trims on the 14cux effected the whole map, but i might be wrong.
A pal of mine got round this by using one of those ~£100 piggyback ecu's, leaving the closed loop sections of the map unaltered so it wouldn't alter the fuel trims, seemed to work well.
How good is the original fuel regualtor and if i changed it is the map sensitive a slight change in pressure .I took it apart and it seemed fairly s
te quality compared to regulators from weber/aeroquip/AEM etc. The rubber diagphram was really thin and stretched which probably caused the problems. Got a weber adjustable fitted now and no problems in three odd years.Just a thought but if you increase fuel pressure, won't the ecu start logging rich mixtures in closed loop, and then start pulling fuel with the short and long term fuel trims which will lean out your mixture again? I thought the trims on the 14cux effected the whole map, but i might be wrong.
A pal of mine got round this by using one of those ~£100 piggyback ecu's, leaving the closed loop sections of the map unaltered so it wouldn't alter the fuel trims, seemed to work well.
SILICONEKID345HP said:
How good is the original fuel regulator and if i changed it is the map sensitive a slight change in pressure .
The original is the bks i.e very reliable things like this are always most reliable factory IMO 2.5 BAR is stock I run a 3 BAR BMW (no surprise seeing as the Lucas system is a Bosch rip off) FPR and bigger inj's to allow a little more scope for my fueling inj duty cycle which will come into its own with the new motor hopefully 
Edited by Sardonicus on Friday 13th February 20:56
Sardonicus said:
he original is the bks i.e very reliable things like this are always most reliable factory IMO 2.5 BAR is stock I run a 3 BAR BMW (no surprise seeing as the Lucas system is a Bosch rip off) FPR to allow a little more scope for my fueling which will come into its own with the new motor hopefully
Mine is set at 2.6 so would the 2.5 one under fuel and the 3bar would over fuel . ? What are the advantages of having more pressure apart from maybe a better spray pattern .ks i.e very reliable things like this are always most reliable factory IMO 2.5 BAR is stock I run a 3 BAR BMW (no surprise seeing as the Lucas system is a Bosch rip off) FPR to allow a little more scope for my fueling which will come into its own with the new motor hopefully SILICONEKID345HP said:
Mine is set at 2.6 so would the 2.5 one under fuel and the 3bar would over fuel . ? What are the advantages of having more pressure apart from maybe a better spray pattern .
More scope for the fuel inj if things are getting marginal Daz 
you did it properly and just purchased bigger inj's The proof
https://www.youtube.com/watch?v=UGYWFJWee8M
And you can hear how big the cam was
https://www.youtube.com/watch?v=3nf10BnS6jU
https://www.youtube.com/watch?v=UGYWFJWee8M
And you can hear how big the cam was
https://www.youtube.com/watch?v=3nf10BnS6jU
Alexdaredevils said:
The proof
https://www.youtube.com/watch?v=UGYWFJWee8M
And you can hear how big the cam was
https://www.youtube.com/watch?v=3nf10BnS6jU
You was who I was referring too earlier, thanks for posting up that last vid Alex ...... legend.https://www.youtube.com/watch?v=UGYWFJWee8M
And you can hear how big the cam was
https://www.youtube.com/watch?v=3nf10BnS6jU
Bobby Shaftoe said:
Wasn't a big fan of fse/malpassi regulator, it kept drifting out of tune on mine and wouldn't give the same fuel pressure from one day to the next, i asked the same question over on the V8forum and it seems quite a few had the same problems.
I took it apart and it seemed fairly ste quality compared to regulators from weber/aeroquip/AEM etc. The rubber diagphram was really thin and stretched which probably caused the problems. Got a weber adjustable fitted now and no problems in three odd years.
Just a thought but if you increase fuel pressure, won't the ecu start logging rich mixtures in closed loop, and then start pulling fuel with the short and long term fuel trims which will lean out your mixture again? I thought the trims on the 14cux effected the whole map, but i might be wrong.
A pal of mine got round this by using one of those ~£100 piggyback ecu's, leaving the closed loop sections of the map unaltered so it wouldn't alter the fuel trims, seemed to work well.
Thats 90% correct- The ECU will try and pull the mixture back into line up to 3400 when it goes open loop. Changing the fuel pressure will allow you to to tweak the fuelling above 3400 rpm as you will, but the ECU will then start making bigger corrections below 3400 rpm to pull the mixture back in line. The long term trim is set at idle as a base line to try and keep the short term trim to a minimum so its really important to give the ECU time to re trim if you have changed the pressure- this is about 2.5 mins at idle on a hot engine. If however the ECU has to make big short term trim changes to compensate for changed fuel pressure you may find additional shunting. You can tweak the AFM output by various means (such as piggy back units)to try and alter the load points the ECU is using for the amount of fuel, and I did try a unit from a Canadian company that allowed digital remapping of the AFM output, and although in theory it was brilliant, it proved really unreliable as it kept corrupting its map as it simply could not cope with ignition spikes on its supply.I took it apart and it seemed fairly s
te quality compared to regulators from weber/aeroquip/AEM etc. The rubber diagphram was really thin and stretched which probably caused the problems. Got a weber adjustable fitted now and no problems in three odd years.Just a thought but if you increase fuel pressure, won't the ecu start logging rich mixtures in closed loop, and then start pulling fuel with the short and long term fuel trims which will lean out your mixture again? I thought the trims on the 14cux effected the whole map, but i might be wrong.
A pal of mine got round this by using one of those ~£100 piggyback ecu's, leaving the closed loop sections of the map unaltered so it wouldn't alter the fuel trims, seemed to work well.
http://www.14point7.com/products/ultra-air-fuel-co...
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