Mapping The FIESTA MR265 myself was a big fail

[@opexo]

the fuel pressure on direct injected cars is known to drop dangerously low in the lower rpms due to the high pressure fuel pump being driven by the camshaft and it just cant keep up even tho the pump the tappet etc all could be as fine as new because it's purely rotating slower than in the higher rpm's when the demand is even higher but it can keep up, and this is what gets ppl puzzled. And i believe on this engine the exhaust cam drives the HPFP and so i think its advancing is linked to trying to keep up the pressure by making it make a 'pump' just before injector 'squirt'

[@Sparkplugsteve]

Maybe true on some cars but on my own car it's never had an issue meeting the fuel demand. Fiestas usually are OK especially at this pressure.

[@timbo19751975]

Peak fuel requirement on a GDI turbo engine is always at peak torque i.e. lower in the rpm than peak horsepower. which is when the HPFP is really struggling to keep up since it's not turning very fast. The engine also tends to be mapped to run richiest at peak torque rpm's to keep a lid on detonation - placing even greater demands on the HPFP. The ECU will spot the mixture going weak as fuel pressure begins to drop and command abit more injector duration. This will lower FP, so flow drops. The ecu demands still more fuel, opens injectors more, FP drops yet more. Its a vicious circle. The work around is to limit torque in the mid range to keep the FP up to close to desired if you cannot get a larger HPFP. Sometimes adding more lift pump pressure from the tank helps. Does the ST run a PWM lift pump?

[@jamescarnell4610]

Great video Steve, good to see you’re getting grips with HP Tuners 👍

[@Sparkplugsteve]

Thanks James

[@Gts2pro]

The cam timing is also altered with the cam timing tool on the mountune , they have to lock the engine and then remove the belt , alter cam then put all back together, that’s my understanding of what they do on the mr230 , 260 , You’ve got a can of worms , I reckon to leave it well alone good luck tho 😃

[@kevinevans3237]

Good work, I’ve never really understood mapping etc but that has given me a little insight to what happens. 👍👍

[@jackbeames7643]

Happy new year Steve. Great video again. Looking forward too more to come!

[@TheRsrunner]

Brilliant! Keep us updated. 👍

[@rowanlewisuk]

Mapping it yourself is awesome fun. Its easy to get carried away with the boost

[@Sparkplugsteve]

Kaboom. 😁

[@marcusmoorcraft9232]

I have an MR230 and had this exact same thing today on the dyno. Fuel pressure dropping from 150bar to 85bar for around 2000K RPM in the low figures.

[@Sparkplugsteve]

85 is dangerously low. mesage me on lnsragram if you can

[@marcusmoorcraft9232]

@@Sparkplugsteve don't have Instagram mate unfortunately. The guy doing the dyno stopped when he saw the data and didn't want to do a third run. I am on Facebook though and have the logs.

[@Sparkplugsteve]

@@marcusmoorcraft9232 no worries. I'm on Facebook to as Steve Edwards but I'd get your cam tappet looked at as a precaution.send me a message.

[@marcusmoorcraft9232]

@@Sparkplugsteve messaged you mate

[@waynerountree9284]

Top content as always thanks for sharing 👍

[@leeevans4635]

I'd guess the same as you mate the cam timing being the reason for the pressure difference? Thing is many moons have passed since the Mountune fairy dust was sprinkled and many hands have also fettled👍 Great experience to have a go and learn though all the same i'm sure you guys will sort it but for out and out power i think cam timing back as Mountune have always been known to be lets say cautious👍👍

[@scottlaaa]

Recently sold my fiesta st best thing I’ve ever done! I can now sleep through the night not worrying if it will be there in the morning 😂

[@scott2495]

Defenders are alot more attractive cars to pinch…

[@scottlaaa]

@@scott2495 i sold the defender before I bought the st 😂

[@sinanemati88]

Great & informative update!!

[@reefbloke]

Little bit unrelated but how did the sports cat break? Weld go or chucked it’s guts out? Keep on doing what you do by the way, nice to watch a video by someone level headed with a bit of savvy

[@Sparkplugsteve]

The welds cracked sadly. Thanks very much.

[@Mo_R9]

Would u recommend getting an st200 clutch or an uprated st200 plus clutch from puma speed ?

[@Sparkplugsteve]

I'm 325bhp on a standard one.

[@Mo_R9]

@@Sparkplugsteve ohh nice I burnt my clutch out and I’m on stage 1 😂

[@TimH601]

Hi Steve if you get stuck on the mapping process, there you so one I know you should speak that been doing remaps for 25 plus years, his name is Martin at Pendle Performance. Watch his videos on KZbin and on his Facebook page, I’m sure he can help point you in the right direction to explain why your losing fuel pressure. Good luck 👍

[@jayaircon]

I think you’re on to something with the cam timing / hpfp being driven by the exhaust cam. Just wondering, is the fuel pressure regulator ok? Are the injectors ok or are they passing a bit too much fuel, causing pressure drop?

[@Sparkplugsteve]

We want the cam timing put back to normal anyway now so hopefully that fixes it but if not we will explore other options you mention.

[@aaronjames1466]

Love it! Keep the videos coming ! 👌🏼

[@johnrowell942]

Great video. What have Mountune said about their mapping and which stage map was fitted in the past to the car? As i guess they should have a record of it being fitted and how much bhp it should make.

[@Sparkplugsteve]

We have no idea of it's history or how it was mapped. It was a copart car at some point and all mods were don't before that.

[@steve19901988]

Keep up the good videos mate . One thing I don't get though. How can someone pay for a specific product or service, doesn't get what the product claim and doesn't do anything? The car shows 40bhp LESS than the claimed figures not 5-10bhp. How can anyone be happy with that? The guy changed a turbo and he gets gapped by stage 1 fiestas... Secondly, mountune stopped tuning the cam timing manually and has software updates to tune it via the accessport. Have you gotten in touch with them? Thirdly, mountune software doesn't work well with non mountune hardware. Does the car have the correct hardware? Cheers :)

[@steveguest8028]

So has the cam timing been physically adjusted Steve ?

[@Sparkplugsteve]

It has by mountune yes.

[@J4cko999]

Could it be it needs a fuel filter, or maybe the fuel pressure sensor is the problem (again ?)

[@Sparkplugsteve]

We shall see how it goes after the cam reset but it has no problem with fuel flow at high rpm.just low down.

[@mato6955]

Great channel Steve got a remapped fiesta st180 having a message engine malfunction service now it looses power won't rev above 3k anyone have any ideas to what it could be thanks

[@Mo_R9]

U done symposer delete?

[@mato6955]

@@Mo_R9 yes I have

[@Sparkplugsteve]

Need to be scanned for faults

[@mato6955]

@@Sparkplugsteve thanks

[@matt12345b]

I have the m285 and I got the engine service now error with spanner on the dashboard (not eml) issue was a boost leak. The mountune intercooler was cracked. New intercooler and all good. Would of expected an eml rather than a spanner but that's what it was so yours could be similar

[@Auxbeam]

Hi Do you need some great lighting for your car to help you better driving at night? We're the pro auto lighting manufacturer for nearly 20 year and we're looking for sponsorship!

[@markpoxton1119]

This mapping job isn't As hard as folks think, most mobile 'pro' tuners just use generic maps...