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Discussion in 'A3/S3 Forum (8L Chassis)' started by gez, Aug 6, 2010.
Hi, is a 4 bar fuel pressure regulator needed on stage 2 setup on the S3???
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revo 2 needs one. it make sense to run more fuel to gain more power!
Revo used to specify having a 4 bar FPR but don't anymore... its not required for a std K04...
Revo stage 2 (or any stage 2 for that matter) doesn't give much more than a stage 1... will feel a bit better though as it will make better use of the stage 2 prerequisits but a 4 bar is really not needed and will tax the standard (old) fuel pumps into early retirement making the engine run lean...
Ok i didnt think i needed it. Going to amd next sat for stage 2map and was reading on other threads that its needed. You would surly only need it with an upgraded pump and hybrid or the like.
I agree with you tuffy, I've also heard the pump story before from badger5, but when I wanted to get the stage 2 done, AMD essex told me I would not see any increase in BHP or torque unless I had one of those, so I had to go with the flow.
hmmmm AMD Essex
answer is dependant on the code provider.
is it required? technically no
some write code which is aimed at 4bar being used however... but in tuning terms its not required no, and i fear for the pumps ability to provide sufficient flow when squeazed down to 4bar pressure is risking lean conditions as its flow sags under the pressure, more so on older cars like s3's are
check with your chosen mapper.. is my advise
i dont use them
A 4 bar reg will kill a old pump. in my case a 9 year old one...
Ive got a new one in there now but if the car is mapped again or i take things any further i will change the injectors rather than continue to run 4 bar reg
im running 4 bar reg on an AMD map, i was massivly dissapointed with the way the car was mapped by them so much so i hate the map, but in reality the map is very good once its settled and not running silly wow factor boost!!!!!!!!!! for me my stage2 is a huge improvment over stage1 however i have carried out all neccasary mods to get the most from my stage2
i do get about -10 to -15% on my long term fuel trims ever since the mapp i no i have absolotly no boost or vac leaks could this be a sign the pump is struggling???
negative values are the ECU taking fuel out as its getting too much...
oh ok cool cheers, so just poor mapping then??
Could well be... does doing a fuel trim reset make the car feel faster of slower?
I had this on mine while Bill and I were dynoing it the other weekend...
Fuel trim reset??
All getting a bit technical now
yeah, resets ECU adaptions to 0% again forcing the ECU to 're-adapt'... Bill did this to mine on the dyno the other week with interesting results...
The red graph lines are before the reset and the orange lines are after the reset.... I gained more torque and got smoother delivery... this suggests my map needs fuelling adjustments but then we knew that anyway as its not a final one as yet...
i reset it via vagcom by clearing fault codes (there arn't any but still seems to reset which puts all values to 0%???) it used to make a difference with better performance and higher boost but now since recently fixing my long issue i have had with boost pressure it seems to stay at the same boost settings and no difference in performance etc with vagcom reset.. can you reset the ecu properly with vagcom?
Not sure if there is a specific way to do it but doing a fault code reset on the engine block will typically reset the adaption values...
Interestingly, I'm getting similar issues, for an unknown reason. My long term trims climb towards -10 for no apparent reason. Also, resetting trims makes no obvious difference in power or drive ability....
your using revo software arn't you?? so maybe its not software related? prehaps if you find a fault you could point me in the right direction
Will do - I've not looked into it at any length yet as the adaptions aren't getting high enough to make me want to remove my arse from the sofa. I should do though.
Question - have you de-meshed your MAF?
did have but it seemed to have negative effects, was good to start with but the maf started to fail