All Things Mk5 > Members Rides
Candy White Golf GTI Ed. 30 - 8th track day at Estoril
pudding:
--- Quote from: Shoduchi on December 08, 2018, 07:51:52 pm ---
--- Quote from: Pudding on December 08, 2018, 01:21:17 pm ---Wow, lots of updates :smiley:
IC looks great :happy2:
The reason for the high coast down losses is because of 5th gear. You will also measure less wheel torque at the roller in 5th and 6th. 4th is 1:1 ratio (no gearing at all effectively - 1 crank revolution = 1 road wheel revolution) and will read the most accurate wheel torque, and will also have the least coast down losses. 5th and 6th takes longer to slow the dyno down, hence the high losses. And similarly, you shouldn't dyno a car in 1st, 2nd or 3rd gear because they increase wheel torque, but you would get smaller losses :happy2:
I've never heard of wheel torque being 'too low' for a dyno before, that is strange!
I really would not concern yourself with that stuff. It's just numbers. It's obvious in the driving seat when modifications work :happy2:
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The problem with the test in 4th gear is that the bench didn’t push the engine enough to make full boost, so the torque measured was only 443 Nm, so the engine power was 398 CV with that torque. Measuring in 5th gear, being an heavier gear, really pushes the engine to its full power. It measured in 5th gear on the 1st test 412 CV/480 Nm. Then I asked to test in 4th, which didn’t seem to be a true test with the least torque I’ve seen measured (the exhaust sound was also weaker on that run). So I requested a final run in 5th gear to be sure about the numbers. It came with a bit more torque than the 1st test and similar power (409 CV/495 Nm). When I had the K04 the car measured 500 Nm in 5th gear on a different Maha dyno.
The dyno owner didn’t want to modify the dyno’s factory settings. Not sure if with more roller brake in 4th the car would measure better. :thinking:
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That is a strange. Standard practice on dynos is to use a 1:1 to gear ratio, or as close as possible. Maybe 5th is reasonably close to 1:1, I haven't studied the gear ratios in DSG or manual, but mine was measured in 4th and had no trouble putting the right numbers down. 4th usually is 1:1 in most gearboxes though. My tuner uses an old Sun Dyno from decades ago :grin: Maybe the newer ones are more sensitive. Not sure. Great numbers either way :happy2:
Shoduchi:
--- Quote from: Pudding on December 14, 2018, 11:40:30 am ---That is a strange. Standard practice on dynos is to use a 1:1 to gear ratio, or as close as possible. Maybe 5th is reasonably close to 1:1, I haven't studied the gear ratios in DSG or manual, but mine was measured in 4th and had no trouble putting the right numbers down. 4th usually is 1:1 in most gearboxes though. My tuner uses an old Sun Dyno from decades ago :grin: Maybe the newer ones are more sensitive. Not sure. Great numbers either way :happy2:
--- End quote ---
It made good numbers for a lower boost pressure than with the K04, which was what I wanted too when I decided to go for this upgrade. Lower boost levels should mean lower IAT on track. And no surge too. :smiley:
pudding:
--- Quote from: Shoduchi on December 14, 2018, 11:51:08 am ---
--- Quote from: Pudding on December 14, 2018, 11:40:30 am ---That is a strange. Standard practice on dynos is to use a 1:1 to gear ratio, or as close as possible. Maybe 5th is reasonably close to 1:1, I haven't studied the gear ratios in DSG or manual, but mine was measured in 4th and had no trouble putting the right numbers down. 4th usually is 1:1 in most gearboxes though. My tuner uses an old Sun Dyno from decades ago :grin: Maybe the newer ones are more sensitive. Not sure. Great numbers either way :happy2:
--- End quote ---
It made good numbers for a lower boost pressure than with the K04, which was what I wanted too when I decided to go for this upgrade. Lower boost levels should mean lower IAT on track. And no surge too. :smiley:
--- End quote ---
Yes exactly, I was just saying that in Csirgo's thread. Less stress on the turbo (compared to KO4) and more power too, win win :happy2:
It's too late now, but I discovered recently the Ohlins kit now has TUV approval :grin:
Shoduchi:
--- Quote from: Pudding on December 14, 2018, 11:54:40 am ---Yes exactly, I was just saying that in Csirgo's thread. Less stress on the turbo (compared to KO4) and more power too, win win :happy2:
It's too late now, but I discovered recently the Ohlins kit now has TUV approval :grin:
--- End quote ---
I only a TUV certificate for the Golf mk6, not the mk5. :confused:
pudding:
--- Quote from: Shoduchi on December 14, 2018, 11:56:20 am ---
--- Quote from: Pudding on December 14, 2018, 11:54:40 am ---Yes exactly, I was just saying that in Csirgo's thread. Less stress on the turbo (compared to KO4) and more power too, win win :happy2:
It's too late now, but I discovered recently the Ohlins kit now has TUV approval :grin:
--- End quote ---
I only a TUV certificate for the Golf mk6, not the mk5. :confused:
--- End quote ---
MK5 as well now :wink: https://www.ohlins.eu/en/products/automotive/skoda-octavia-rs-04-13--36/
Thankfully we don't need approvals in the UK!
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