All Things Mk5 > Members Rides
Candy White Golf GTI Ed. 30 - 8th track day at Estoril
Shoduchi:
--- 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:
--- End quote ---
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:
teo_parvu:
Hmmm...that is strange indeed, but as I said before 8.2 is really fast and I believe there was a dyno issue. Anyway, do you use a 155/165 fpr valve, my tuner told me that I need one for good fueling with TTE? What is your opinion about the MFactory LSD?
Shoduchi:
I got the 165 bar FPRV from AKS Tuning. You’ll need the upgraded LPFP too, at least I needed it because the stock wasn’t able to keep a safe pressure during long periods of full throttle. I’ve updated the initial post with all my mods, if you want to check anything else. :smiley:
The MFactory LSD is rated to 1000 HP, since it’s made of forged steel. I don’t have any experience to compare with other brands. I can say that it works. Both my front wheels spin at the same speed when I accelerate hard.
teo_parvu:
Ok, then I’ll get a 165 fpr valve too, I’ve heard good things about Dynodrome, that is 200 euros + 25 shipping, I’ll have to ask AKS about their price too.
I’m already using an additional Bosh 044 LPFP and RS4 injectors, I’m ready for the new turbo.
The reason I asked about MFactory is because I had the Wavetrac LSD before the Quaife and I can’t really remember how it is to drive over 300bhp on the front wheels without diff. Some guys say it is useless.
Thanks,
Shoduchi:
Well, without an LSD I had to wait to straighten the wheels to be able to accelerate hard. On corners, I'd just get wheel spin on the inside wheel. For track day and time attacks, you definitely need an LSD. For fast road use, I guess you can live without one since it's an expensive upgrade.
You have plenty of fuel with those injectors and LPFP. I'm on stock injectors, that's why I really needed the reinforced FPRV. Your tuner to say that you'll need it too, I guess he wants to be on the safe side. :smiley:
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version