All Things Mk5 > Performance Modifications
The octane booster topic
pudding:
--- Quote from: Shoduchi on December 14, 2016, 06:06:16 pm ---
--- Quote from: Pudding on December 14, 2016, 04:46:23 pm ---
--- Quote from: Shoduchi on December 14, 2016, 12:35:19 pm ---
--- Quote from: Pudding on December 14, 2016, 11:07:56 am ---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:
--- End quote ---
For my surprise, the tuner's and the dyno owner's my engine makes consistently at least 270 CV with the factory map. Increasing the boost to 1,4 bar and the fuelling accordingly it makes 330 CV.
I just don't know what is limiting or if anything is limiting the output at the moment. After fitting the CAI I'll know if the OEM airbox was a limiting factor and how much. :smiley:
--- End quote ---
Interesting! Mine made exactly 230hp with the factory map with V Power 99 RON :smiley: Mine makes 300hp with 1.4 bar. That was when it was 100% standard, though. Just software. Is CV the same as PS?
--- End quote ---
Yes, AFAIK PS (Pferdestärke) is the German unit that measures the same as CV (Cheval vapeur), that is a French unit (and same as HP in metric units).
I think the Loba HPFP and the IC were what benefited more the engine output. With the TBE the engine measured 243 CV in an hot day but also in a different dyno (MAHA LPS3000). Currently it's being dyno'd in a BAPRO dyno.
--- End quote ---
Thanks mate :smiley:
Mine wouldn't get even past 280hp without a Loba! Since the stage 1 map I've added the APR downpipe and the S3 intercooler, so I don't know what it's making currently. It doesn't feel any faster to my butt. Actually slower at some rpms / loads to be honest!
AJP:
You didn't come across at all negatively @Pudding
It's a really interesting discussion. The more I think about it the more questions I end up with!
I think ultimately it's going to be a trade-off, just like tuning in general. It's just a case of working closer to the limit of a safe 'envelope' than usual.
pudding:
--- Quote from: AJP on December 15, 2016, 01:36:34 pm ---You didn't come across at all negatively @Pudding
It's a really interesting discussion. The more I think about it the more questions I end up with!
I think ultimately it's going to be a trade-off, just like tuning in general. It's just a case of working closer to the limit of a safe 'envelope' than usual.
--- End quote ---
The safer you tend to be with daily drivers :smiley: Especially after you've wrecked a couple of engines from 'experimenting' along the way :grin:
Shoduchi:
Went today to get the car tested on the dyno again after fitting the VWR intake and the Go Fast Bits lightweight crank pulley.
Now it measured 355,6 CV and 337 lbft, so about +20 CV and the same torque compared to last time, at 15ºC of ambient temp and 27ºC of intake temp. :pomppomp:
The intake really made a good difference, not just on the butt dyno. :grin:
Not sure what was the contribution of the lightweight crank pulley to the final result.
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