Dual Pulley (DA + 1470ft) results...

B8 S4
#6

Last time at the track, conditions allowed for approx +1270ft DA’s (slightly better, but not enough to make any noticable difference), where I ran 11.7x’s 60ft times of 1.68x with a best of:

60’ 1.681
330’ 1.681
1/8 7.516
mph 93.51
1000 9.79
1/4 11.717
mph 117.06

On that same day (IIRC this was approx. 3 1/2 weeks ago) with a similar 60ft time as yesterday’s dual-pulley:

60’ 1.686
330’ 4.880
1/8 7.541
mph 93.05
1000’ 9.821
1/4 11.754
mph 116.67

I’m very interested as well, my butt dyno tells me that even by the end of 4th gear, there isn’t a sensation of bypass or timing dropping, just a nice pull. I do notice that the car doesn’t pick-up too much speed until 5,500rpm, which does make me wonder if i’m starving for fuel (with my mix) in the mid-range. Don’t get me wrong, its stronger than the non-dual set-up in the mid-range, but there is a nice bump in power that starts at 5,500rpm, where as the non-dual pulley was more linear in pull. I’ll be picking up the ross-tech today and hopefully can log sometime this weekend.

#7

I don’t think i’ll be seeing that 300ft DA’s any more until Dec’ :frowning: But I’m going to continue to work with the weather conditions I have, it would be interesting if I can beat my previous best time in higher DA’s. I’ll start logging soon and get it posted for review.

#8

10-15 minute cool down between those runs (hood opened, car on to let coolant flow through the intercooler to cool), no straight back-to-back/hot lapping runs. I should bring an ice bag next time just in case ;D

Wish someone has a DIY to install an independent switch for the cooler pump to run while the car is off. That’s something I would love to do once I start on my cooling system upgrades piece by piece.

#9

Also, for comparison sake after looking at all of my past non-dual pulley timeslips, my 11.5x’s were all 1.66x 60ft times and traps were 117.xxmph, and one 118.31mph.

#10

I know you’ve answered this somewhere, but you don’t have LW wheels or brakes/rotors? What wheels and tires do you have now?

#11

currently OEM 19" rotors (19x9) on OEM Dunlop Sport Maxx GT tires.

Will have PSS installed soon (4lbs lighter per tire to boot).

#12

what do the OEM rotors weigh?

Bummer you’re in texas because your car is fixing to set the 3.0T record. I will need to update you on the list.

#13

IIRC 29lbs. If you add me, use the 11.486 non-dual time if you could lol

I’m also in FL, hopefully I can make a record pass still before it gets too hot.

#14

I see what you did there…lol

#15

what’d I do? He went 11.4 @ 119 with one pulley. AKA within a tenth of the fastest B8 S4/S5 time and he is still missing a load of mods like LW wheels, rotors, overdrive pulley, overdrive tune.

I really think this spring will see a lot of breakout times for the 3.0T cars. There’s a whole new generation of owners who are going to the strip. You old guys have to look over your shoulder because they’re coming!

#16

ross-tech installed and working, now just waiting for the callback from the tire shop that my car is ready so I can start logging ;D

I’m surprised myself that I am .86 away from the current stock S/C record with so little done as well. It looks like the weather will be improving (humidity-wise) for the next week or so. I am hoping I can set a W/R with my fuel mix (as long as the logs look good) with the new set of tires. In any case, it does go to show you the potential of this platform and I also see multiple records being broken this year by others who are stepping up to a dual-pulley set-up.

Primetime, I hope that shift lag gets fixed! I have started to notice something similar myself, only not to the degree of yours, at the last couple events particularly on the 3-4 upshift, and it does cost some time when I compare similar 60ft & 1/8mile runs that should have resulted in similar 1/4mile times but were within .04-.06 of each other.

#17

oops…not .86 away from the current stock S/C world-record, .086 away.

#18

Man, it’s worth buying one of these and replicating yor exact kid strategy :wink: faster than a stock rs7 and s8 and about as fast as a tuned c7 s6 :slight_smile: keep it moving man! I guess you got rid of the m3 idea after all. Heard that car has no soul btw

#19

“Fixing” lol.

#20

0.86? I think you need to start dividing by ten. That’s the second time. You’ve done that.

#21

Texassauce :slight_smile:

#22

The irony is that my work is surrounded by numbers and calculations all day…

#23

Haha
You did it the other day saying 0.4 instead of 0.04

#24

quick log tonight, I don’t recall that I turned off DSC all the way (actually had a 1st-4th gear log) and was bypassing a bit (up to 11% in after 5,500rpm in 1st/2nd, at up to 18% between 4,000-5000, right were I felt that “lag sensation”)

here is a quick screenshot, interesting to me is that I’m not having any ignition correction, my BPV does bypass some near redline, but it did not bypass at all in 4th gear where I shut down due to road limitations, and my throttle seems to be lower than others at 89% for WOT, makes me wonder if I actually hit the kick-down switch? (I don’t recall, I think I was too nervous as it was my first time logging). I’ll have to send over better logs once I’m more cool-calm-collected. Essentially, the bypass valve staying closed the majority of 3rd and all of 4th mirrors my butt sensation at the track where it remains strong, but in the mid-range it falls slightly. I’ll have to log lambda value’s and see if I need to adjust my E85 mix lower and ride the threshold of ignition correction. Judging by my actual ignition and monitoring only 1 cylinder and not having any corrections, that it may be worth a try:

http://audirevolution.net/addons/albums/images/686595304.jpg

#25

and I believe my calculated peak boost is 18.62 despite some bleeding?