Author Topic: Danger of increased carbon build up with 100 octane if not up-tuned?  (Read 1433 times)

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Offline Chchgti35

  • Posts: 63
  • 2012 Mk6 GTi 35 edition
Have been using 100 octane for some months now, engine tune hasnít been changed from stock as concerned about warranty issues (VW dealer used car warranty), is there a likelihood of increased carbon buildup if running 100 octane with stock tune ?

Offline Naekyr

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Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #1 on: August 15, 2019, 07:43:16 pm »
Would have thought there would be less carbon

Offline ziptie.nz

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Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #2 on: August 15, 2019, 07:56:14 pm »
Have been using 100 octane for some months now, engine tune hasnít been changed from stock as concerned about warranty issues (VW dealer used car warranty), is there a likelihood of increased carbon buildup if running 100 octane with stock tune ?

It wont make any difference.

Carbon build up is symptomatic of Direct Injection not Octane Levels.
MK2 GTI 16v, MK2 TDI - Rollin' Coal, Audi V8 Quattro, Audi A3 Sportback 2.0 TDI

Offline mark2 golf

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Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #3 on: August 16, 2019, 07:20:01 am »
Just make sure its not leaded. I was told the av spec 100 octane still has lead.
89 mk2 1.8t
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Offline ziptie.nz

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Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #4 on: August 17, 2019, 07:23:31 am »
Just make sure its not leaded. I was told the av spec 100 octane still has lead.

There is a difference between AV gas, NPDís 100 is a widely available fuel in the south island it is definately unleaded

I am fairly certain it is illegal to pump Leaded fuel directly in to cars or use it on the road, which is why when buying ďRace GasĒ or AV1 you need to put it in to a fuel container and only run it when you are at ďthe trackĒ

Pretty certain most actual aviation fuel is still leaded because of its Stability in the environment it is used
MK2 GTI 16v, MK2 TDI - Rollin' Coal, Audi V8 Quattro, Audi A3 Sportback 2.0 TDI

Offline ERRRNO

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Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #5 on: September 18, 2019, 09:01:57 pm »
As mentioned above. I run all my cars on NPD100 and I can see the differences even on a stock vehicle. I tune them all the time and often see stock cars come to me with 95 octane in the tank. I know because I see timing pull in the logs at low rpm especially. Timing pull happens when ignition knock occurs if you didnít know. Higher octane fuels are more resistant to preignition. Which is a good thing.

There is no risk of extra carbon build up because of fuel octane levels.

If you run 100octane fuel you should consider a stage 1 tune that will make it run at optimum power and fuel economy. I am happy to put a file together for you ;)
Black 3door Mk4 TDI - Elite Motorsport Hyper miler
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Offline Chchgti35

  • Posts: 63
  • 2012 Mk6 GTi 35 edition
Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #6 on: September 22, 2019, 04:19:33 pm »
Hi there, thanks got the offer. As it has a VW NZ Used Car warranty I am very wary of altering anything from Factory until the warranty expires however we may not keep the vehicle that long anyhow. We just today had the second orange engine check light after the first one back in June (Charcoal canister replacement required) so finger crossed this wonít be anything major. I thought my sonís alfa was an anxiety generator but this car is seriously testing us.

Offline ERRRNO

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Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #7 on: September 27, 2019, 09:06:30 am »
Nah donít worry about it too much. Iím happy to plug into it and help diagnose the CEL if you want. Iím in the New Brighton area.
Black 3door Mk4 TDI - Elite Motorsport Hyper miler
Tornado Red Mk5 2.0 TFSI Variant - Elite Motorsport Stage 2
White Mk6 GTI DSG - Elite Motorsport Stage 1

Offline Chchgti35

  • Posts: 63
  • 2012 Mk6 GTi 35 edition
Re: Danger of increased carbon build up with 100 octane if not up-tuned?
« Reply #8 on: September 29, 2019, 03:00:05 pm »
Thanks, took it into ChCh VW dealership on Monday afternoon, they scanned it and it was PCV fault. Replaced the valve (had one in stock lucky me) and all covered by warranty. Pretty good service having only phoned them at 8.30 that morning.