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Slow throttle pick up

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mad4slalom
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Slow throttle pick up

Post by mad4slalom » Sat Dec 16, 2017 5:07 pm

Hi all, dusted off the MC today and went for a blast, running well and didnt miss a beat Except for , if i blip the throttle from idle it just feels slow to pick up, not a hesitation or stumble but just Slow. If i raise the revs to 2k and then blip from there it is crisp and responds at the speed i would expect an m engined bmw to do. Have reset the throttle procedure, and tried it with sport button too but no different. Anyone else having or had similar issues and any suggestions as to a fix. Many thanks,πŸ‘

Mangozac
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Slow throttle pick up

Post by Mangozac » Sat Dec 16, 2017 9:33 pm

Do you have an aftermarket intake fitted? This is generally a side effect...
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Slow throttle pick up

Post by Beedub » Sat Dec 16, 2017 10:49 pm

Mangozac wrote: ↑Sat Dec 16, 2017 9:33 pm Do you have an aftermarket intake fitted? This is generally a side effect...
really? never heard that before?
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mad4slalom
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Slow throttle pick up

Post by mad4slalom » Sun Dec 17, 2017 2:31 am

Mangozac wrote: ↑Sat Dec 16, 2017 9:33 pm Do you have an aftermarket intake fitted? This is generally a side effect...
No but youd have thought that would make it more responsive surely not less πŸ€”

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Slow throttle pick up

Post by Mangozac » Sun Dec 17, 2017 8:40 am

At low RPMs it effects the response, my understanding is that its related to the turbulence of the air passing the MAF sensor.

I've experienced it firsthand: my Z4M came to me with an AFe intake fitted. Low RPM response was terrible. I fitted a stock airbox and it immediately improved - most noticeable when downshift rev matching below 4k RPM. I now have an Eventuri style intake fitted, which is still way better than the AFe but still I feel isn't quite as smooth as the stock intake.
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Previous: E85 3.0si Silbergrau, 03 E85 2.5i Maldives Blue.
Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR

mad4slalom
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Slow throttle pick up

Post by mad4slalom » Sun Dec 17, 2017 11:06 am

Mangozac wrote: ↑Sun Dec 17, 2017 8:40 am At low RPMs it effects the response, my understanding is that its related to the turbulence of the air passing the MAF sensor.

I've experienced it firsthand: my Z4M came to me with an AFe intake fitted. Low RPM response was terrible. I fitted a stock airbox and it immediately improved - most noticeable when downshift rev matching below 4k RPM. I now have an Eventuri style intake fitted, which is still way better than the AFe but still I feel isn't quite as smooth as the stock intake.
Ok, thanks for that, my airbox is standard although i seem to remember a few years ago there was a post on here re removing a plug in the bottom of the airbox or possibly drilling a hole in it, cant remember the details or if i did it , it may have been my z3mr. But it was supposed to make dome improvement but cant remember what it was πŸ€” anyone ?

mad4slalom
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Slow throttle pick up

Post by mad4slalom » Sun Dec 17, 2017 11:21 am

Mangozac wrote: ↑Sun Dec 17, 2017 8:40 am At low RPMs it effects the response, my understanding is that its related to the turbulence of the air passing the MAF sensor.

I've experienced it firsthand: my Z4M came to me with an AFe intake fitted. Low RPM response was terrible. I fitted a stock airbox and it immediately improved - most noticeable when downshift rev matching below 4k RPM. I now have an Eventuri style intake fitted, which is still way better than the AFe but still I feel isn't quite as smooth as the stock intake.
Can i buy a maf cleaner or will carb cleaner do is the maf sensor the one on the airbox with the plug and a bit of wire that the intake air passes over ? Thanks all

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Slow throttle pick up

Post by Mangozac » Sun Dec 17, 2017 11:33 am

mad4slalom wrote: ↑Sun Dec 17, 2017 11:06 am Ok, thanks for that, my airbox is standard although i seem to remember a few years ago there was a post on here re removing a plug in the bottom of the airbox or possibly drilling a hole in it, cant remember the details or if i did it , it may have been my z3mr. But it was supposed to make dome improvement but cant remember what it was πŸ€” anyone ?
I know the mod you're talking about. It is Z4M and it was plugging a hole, but that wouldn't be the cause.
mad4slalom wrote: ↑Sun Dec 17, 2017 11:21 am Can i buy a maf cleaner or will carb cleaner do is the maf sensor the one on the airbox with the plug and a bit of wire that the intake air passes over ? Thanks all
Yes, that's the MAF. I'd stick with proper MAF cleaner as they are very sensitive sensors.
Current: 06 E85 M Silbergrau
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Mods: Gaptech OTH+R, Dension Gateway 300 with USB, CDV-, clear side indicators, euro tails, stubby, MFSW retrofit, OEM Bluetooth/VR

mad4slalom
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Slow throttle pick up

Post by mad4slalom » Sun Dec 17, 2017 2:51 pm

Thanks mangoza, halfords didnt have any cleaner so will get som monday, been out today with reset throttle and better than it was. Can it still be a dirty maf even with no dash light on ?. One demo vid on utube showed a guy unplugging maf and if motor stalls then maf is good, if it keeps running then maf shot ? But some one i think , said they drove car with maf disconnected to see if any better or worse , bit confused, but will clean anywayπŸ‘

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Slow throttle pick up

Post by tjlazer » Sun Dec 17, 2017 7:56 pm

I wouldn't expect the maf cleaner to do anything, stories are everywhere and the only worthwhile fix is to map it out or replace the maf (if needed). It could be as much fuel as anything if it's been sat a while. Stick some vpower or momentum in, give it a hard drive in sport mode and see if the problem is still there.
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mad4slalom
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Slow throttle pick up

Post by mad4slalom » Mon Dec 18, 2017 12:59 am

tjlazer wrote: ↑Sun Dec 17, 2017 7:56 pm I wouldn't expect the maf cleaner to do anything, stories are everywhere and the only worthwhile fix is to map it out or replace the maf (if needed). It could be as much fuel as anything if it's been sat a while. Stick some vpower or momentum in, give it a hard drive in sport mode and see if the problem is still there.
ah, the good old italian tune up !! It has had little use, always has V power, i will blast whats in there through and give it some fresh. I used to use a fuel preservative and stabiliser in my bike when stood, anyone use that on here πŸ‘

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Slow throttle pick up

Post by BMWZ4MC » Mon Dec 18, 2017 9:03 am

Mangozac wrote: ↑Sun Dec 17, 2017 8:40 am At low RPMs it effects the response, my understanding is that its related to the turbulence of the air passing the MAF sensor.

I've experienced it firsthand: my Z4M came to me with an AFe intake fitted. Low RPM response was terrible. I fitted a stock airbox and it immediately improved - most noticeable when downshift rev matching below 4k RPM. I now have an Eventuri style intake fitted, which is still way better than the AFe but still I feel isn't quite as smooth as the stock intake.
Maybe it was heat soak related :scratchhead: I fitted an aFe I take to my ///M and noticed an improvement in throttle response at all rpms and a much greater willingness to rev in the higher range. I’ve not encountered any problems even on trackdays at 30C in the UK summer, but I can see how it might be more prone to heat soak than the OEM intake in the tropics of QLD :idunno:
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Mangozac
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Slow throttle pick up

Post by Mangozac » Mon Dec 18, 2017 9:20 am

BMWZ4MC wrote: ↑Mon Dec 18, 2017 9:03 am Maybe it was heat soak related :scratchhead: I fitted an aFe I take to my ///M and noticed an improvement in throttle response at all rpms and a much greater willingness to rev in the higher range. I’ve not encountered any problems even on trackdays at 30C in the UK summer, but I can see how it might be more prone to heat soak than the OEM intake in the tropics of QLD :idunno:
While your heat soak theory makes sense I still don't think that was that cause - like I said, it seemed most noticeable when blipping the throttle to downshift under 60km/h. I agree that the response and power delivery is improved at high RPMs though.

I think my reasoning about it being related to the MAF turbulence is because the Eventuri marketing discussed this: http://www.eventuri.net/technology/
Maybe I've just drunk too much of the Eventuri kool-aid? :?
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Slow throttle pick up

Post by Mangozac » Mon Dec 18, 2017 9:21 am

Mad4slalom, how often is your Zed being driven?
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Slow throttle pick up

Post by BMWZ4MC » Mon Dec 18, 2017 11:09 am

As and when I get around to importing my ///M to Sydney, I’ll be able to test my heat soak theory :D
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Z4MC - heavily fettled for track use
Lotus Exige - sensible daily driver on the mods slippery slope
Westfield SEiW - in hibernation
Modified RS4 Avant - back in Blighty
S2000 GT - gone

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