Number 5 WAS a strange event, never seen anything like it before. The RPM hung up but I think(?) the car upshifted a couple of times as the RPM stagnated. This bizarre phenomenon occurred only during one run. Thanks
Were you shifting in manual mode? Definitely try to keep a mental record of these events. I think often people here and elsewhere focus on the drag strip performance of a tune, but daily drivability is also really important, since many of these cars function as daily drivers for most of us (except S4 garage queens like Ron’s ;D).
Ron, I know one thing, don’t buy a wireless VCDS for an Apple computer. I was forced to go buy a small laptop and now use it in a “wired” mode. Had to endure about 20 minutes of updating the VCDS as well. I let the car do as much shifting as possible on it’s own. I think my transmission got too hot waiting for the updates. My first LC attempt was in “Sport”. It failed so I went immediately to Manual and it worked. Odd? Also in sport my LC RPMs were about 3800, in manual 4400. I sure don’t get it. Regardless, obviously, I have to log at the strip with the race fuel and file. That may be 2-3 weeks away? FWIW, zero tire spin. My son did the logging, he knows how to do it but the wireless VCDS, although we use the cable, is a different animal. I think, it uses different numbers for the requested information than the non wireless VCDS? He was cursing at the box more than once! Thanks much.
During that bizarre run I’m 95% certain I was in sport. Will start writing info down.
Saki, very very interesting information. Thanks much.
Just e-mailed logs to REVO. Also talked to Chris, their tech gent. Asked them to take a look at this thread and your opinions.
Sky, Problem is these logs don’t show an issue other than the misfires and mediocre timing… The question that really needs answered is why are you 4-5mph slower than other stage II tuned cars… These logs aren’t going to answer that, only logs during the passes could, but I was hoping these would shed some light on what may have happened as the other Revo 93 logs I have show a ton of bypass…
REVO has some gents in from the UK. They also have logs from the dyno runs. Jeff just e-mailed me and said the tune looks like a 91 octane one with the 93 file selected. I’m ordering more race gas. Promise to log next race day, 2-3 weeks. Also will use my Go Pro. I’ve got to give REVO a chance. Maybe the heavies from the UK can determine something? I DO know how to work their switching, the SDS, for files…I think?
Gents, below is part of a post I made on the 9th. This thought still goes through this old head. Just wondering. Any opinions? Thanks.
"I’ve been contemplating a potential reason for my lower trap speeds for some time now. My rear tires are 1/2 inch less diameter than the fronts or, obviously, 1/4 inch less in radius. That amounts to a 1.8% difference in diameter, well inside the alleged 2% limit. The stagger was my idea and planned. I’ve been spanked accordingly.
Regardless, these cars are highly computerized and I can’t help but wonder if that small difference is reducing power to the wheels to one degree or another?"
One thing to keep in mind is I don’t believe you need to log every pass at the strip. Just try to fit in 1 or 2 while running the race gas file. I know it can get stressful there if you’re not used to logging and trying to focus on driving the car correct.
The center differential is a passive mechanical device, so computers aren’t able to “send power to the front” if this is what you’re alluding to. The most common intervention from the powertrain is to cut power during a traction control event (like on snow), but you have disabled both TCS (one press of button) and ESC (long press), so I highly doubt the computers are intervening.
Someone can correct me if I’m wrong, but I believe the 2% threshold is to prevent the center diff from working overtime and causing issues with heat and wear/tear.
But on this subject, you would probably beit from running some light weight 19" wheels if you can find something reasonable. Most of the cheap LW wheels people here run are enkei or neuspeed, which don’t have 19" fitments I believe. Maybe you could try some TSW nurburgrings in 19x8 as your track setup? If you are thinking about ever returning to the road course, it would be good to get a lightweight wheel setup with dedicated tires. Maybe with something like an ultra-high performance summer hankook R-S3 tire?
Especially when one is senile too! :o
[quote=“drob23,post:171,topic:6856”]
[quote=“Skywagon,post:169,topic:6856”]
Gents, below is part of a post I made on the 9th. This thought still goes through this old head. Just wondering. Any opinions? Thanks.
"I’ve been contemplating a potential reason for my lower trap speeds for some time now. My rear tires are 1/2 inch less diameter than the fronts or, obviously, 1/4 inch less in radius. That amounts to a 1.8% difference in diameter, well inside the alleged 2% limit. The stagger was my idea and planned. I’ve been spanked according
The center differential is a passive mechanical device, so computers aren’t able to “send power to the front” if this is what you’re alluding to. The most common intervention from the powertrain is to cut power during a traction control event (like on snow), but you have disabled both TCS (one press of button) and ESC (long press), so I highly doubt the computers are intervening.
Someone can correct me if I’m wrong, but I believe the 2% threshold is to prevent the center diff from working overtime and causing issues with heat and wear/tear.
But on this subject, you would probably beit from running some light weight 19" wheels if you can find something reasonable. Most of the cheap LW wheels people here run are enkei or neuspeed, which don’t have 19" fitments I believe. Maybe you could try some TSW nurburgrings in 19x8 as your track setup? If you are thinking about ever returning to the road course, it would be good to get a lightweight wheel setup with dedicated tires. Maybe with something like an ultra-high performance summer hankook R-S3 tire?
[/q
I’m relieved to hear that. The thought has been nagging me a little. I’ll do some searching, big Brembo’s all around present a problem?
Gents,
An interesting picture, an observation. Yesterday I was re-checking my tire pressures after the strip experience and noticed this, left front wheel. It is tire dust, if one would call it that? It is about the same all around and also on the wheels and calipers to an extent. I thought I’d post it just as an FYI. I did do 10 runs at the strip but have never seen this stuff before. One can clearly see where I ran my finger through it, One can also see my tire, Michelin Pilot SS with about 12 K on it. Thanks.
Yes, the calipers can always be an issue for any wheel fitment. But you should be able to fit 19" wheels over your calipers, worst case is you’ll need spacers. Don’t your stock rotor wheels fit over them? Problem with the stock wheels is they are quite heavy. So go sell those for 1600 and buy a set of LW track wheels (of course only if you really care about being the fastest guy out there) for a similar price. Try and ping user paul on AZ, he has a 380 brembo bbk and I believe he has no issues fitting some 19" wheels. West also has 380 brembo GT brakes and fits his 19" bbs cx-r’s over them, assuming with no issues.
Also a random aside, but your quoting skills are still lacking. Use the preview button to verify that you did things correct BEFORE posting. Just in case you aren’t aware, this is how you start and end a quote. Remove the ____ to get proper format, but I included them so the site doesn’t make them actual quotes.
[quo___te] text here [/quo___te]
when you reply to someone’s specific post, it will be like this
[quo___te author=Skywagon link=topic=3162.msg92351#msg92351 date=1423757429]
text
[/quo____te]
If you want to reply to the inside of the post, do it by adding the following syntax which I made glow
[quo___te author=Skywagon link=topic=3162.msg92351#msg92351 date=1423757429]
text
[/quo____te]
WRITE WHAT YOU WANT HERE
[quo___te author=Skywagon link=topic=3162.msg92351#msg92351 date=1423757429]
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I wonder if that’s the VHT-esque thing they put on the strip. Do you drive through or around the water that they spray?
You can also use the “code” tags like below if you want to show someone else how to use forum tags. ;D
when you reply to someone's specific post, it will be like this
If you want to reply to the inside of the post, do it by adding the following syntax which I made glow
WRITE WHAT YOU WANT HERE
[/quote]Haha, my post was probably pretty hard to understand. Thanks for the pointer ;D
Yes sir, blew that post for sure. Stock 19s long gone, sold. Will start shopping.
Exactly. I can stay out of the water most of the time. My point? Lots of spinning and I get this, no spinning no deposits on car. Now been to this track 5 times, not seen this before.