All Things Mk5 > Performance Modifications
The octane booster topic
Dan_FR:
Timing advance has a huge impact on peak numbers, and whether the current map will take advantage of the extra octane. Thorw as much of this stuff in a car with a conservative timing map and you'll see no benefit..... until heat becomes a factor i.e. after hard driving/track use etc.
ducman77:
--- Quote from: Shoduchi on December 14, 2016, 01:00:34 am ---Nothing really noticeable on my but dyno, unfortunately. :sad1:
--- End quote ---
So sorry to hear this Shoduci :sad1:
I really am wondering why it made such a difference on my car?
I think it's the very poor quality of our Irish fuel that makes the booster shine.
For people living in the UK or Portugal or anywhere where you can buy decent fuel maybe this booster is not so useful/effective?
Also as Dan says, timing wise my car was crying out for more octane. You guys are probably closer to optimum with 98-99RON straight out of the petrol station
pudding:
Shoduchi is in the 'diminishing returns' area with his car. He's already +100hp over standard and without turning the boost up a lot more, he's not going to get a lot more from it, so octane booster won't make a lot of difference for him :smiley:
330 currently, +5hp gain is 1.5%. At that level, to actually 'feel' a difference you need at least +10% gain :smiley:
It probably worked for you as your fuel isn't great to begin with, so it's probably performing like it would in England running 99 V Power :smiley:
Shoduchi:
--- Quote from: Dan_FR on December 14, 2016, 10:04:54 am ---Timing advance has a huge impact on peak numbers, and whether the current map will take advantage of the extra octane. Thorw as much of this stuff in a car with a conservative timing map and you'll see no benefit..... until heat becomes a factor i.e. after hard driving/track use etc.
--- End quote ---
I asked this to the dyno owner but he isn't the tuner so he didn't know exactly how much timing advance the map has included. It's something I'll try to know when I talk with the tuner again.
ducman77:
--- Quote from: Pudding on December 14, 2016, 11:07:56 am ---It probably worked for you as your fuel isn't great to begin with, so it's probably performing like it would in England running 99 V Power :smiley:
--- End quote ---
Exactly mate :happy2: I think that is 100% correct :smiley:
Not sure if I mentioned it before but; when I had my car dyno'd before it was mapped it only made 184hp and 200ft/lb.
It's a solid car. Had 68k on the clock at the time. Very well maintained. It also had new oil, air filter, coils, spark plugs, cam follower etc. etc. before it went for mapping. So there was no good reason for it to be 16hp down on factory quoted power.
After the map it "only" made 224hp and 240ft/lb.
You would expect a similar car in the UK to be making a reliable 200hp before tuning and maybe 240-250hp with a stage 1 Map.
I think a big part of the issue with my particular car is our fuel. Once I added the octane booster the car came alive!
I reckon it's probably somewhere closer to 240hp now. Which of course is very noticeable on the butt Dyno if coming from 224hp.
My tuner is a good friend and collaborator with Niki Gower and I believe they share mapping strategies. So, as mentioned by Dan, I believe my car was crying out for octane to optimise the map installed on it.
I'll probably end up being Cheryl's best customer until some brave fuel supplier in Ireland comes back the the market with decent fuel.
Our garages now have no signs on the pump (they used to) telling you what octane you're buying.
For all I know its probably 93 or 91RON fresh off the boat from the USA :smiley: :laugh: :smiley:
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