Today's burnout on film
07-13-2006, 01:17 PM
#31
Supercharged
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Originally Posted by Hacker-Pschorr
Interesting, so static fuel pressure is bumped up - then the Shark Tuner does the rest with the injector pulses?
07-13-2006, 01:44 PM
#32
Race Director
Andrew
Not bad.......of course a cameraman would help immensely!! Maybe a volunteer from beer night (before beers!) could be found to hold the camera......then the BillB-esque burnouts will be seen!!
Not bad.......of course a cameraman would help immensely!! Maybe a volunteer from beer night (before beers!) could be found to hold the camera......then the BillB-esque burnouts will be seen!!
07-13-2006, 01:44 PM
#33
Burning Brakes
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You don't have to go through all of that nonsense with the TS installed 
Originally Posted by MarkRobinson
Awesome. Andrew, tried a staged burnout before? put a little water on your tires to facilitate a stress-free, low rpm launch, and once the clutch is lifted, with your left foot, gently press the brake to slow/stop the car from rolling, meanwhile watching your rpms so you don't bang it off the rev limiter. Works great!
Here's a poor example: http://videos.streetfire.net/recentv...2A0B52D718.htm
Here's a poor example: http://videos.streetfire.net/recentv...2A0B52D718.htm
07-13-2006, 01:45 PM
#34
Burning Brakes
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But a very manly girl 
Originally Posted by Andrew Olson
Ahhhh... there's nothing like waking up the neighborhood with a nice dose of melted rubber. It's no Bill Ball burnout, but it's my fist one caught on film. 
Two things to note:
1. Yes, I run like a girl!
2. Check out the ant on the left side of the screen. He ducks for cover just in time!
Enjoy!
http://members.rennlist.com/andrewmolson/Burnout.WMV
(Might have to right-click and do "Save As".)
Two things to note:1. Yes, I run like a girl!
2. Check out the ant on the left side of the screen. He ducks for cover just in time!
Enjoy!
http://members.rennlist.com/andrewmolson/Burnout.WMV
(Might have to right-click and do "Save As".)
07-13-2006, 02:07 PM
#36
Three Wheelin'
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07-13-2006, 03:02 PM
#38
Three Wheelin'
Originally Posted by wino5150
Will you be adding an adjustable or rising rate fuel pressure regulator, since the engine will tend to 'lean out' at the higher rpm's when you use the Xpipe. This is according to DR at 928SP, and certainly would seem to help. Others with this problem or suggestion?
Thanks,
Roland
'91GT, looking to add Xpipe, currently with RMB
Thanks,
Roland
'91GT, looking to add Xpipe, currently with RMB
A 928 S4, or GT, will not run lean with addition of the X pipe. One condition. The MAF has to be a good one. If the MAF is aged and not sensing enough air mass, it could go lean. But then with an aged MAF, you are running lean anyway. The LH fuel maps go progressively richer as the MAF sensed load goes higher. They are made so the more air mass is used, the richer it is. Changing to an X pipe won't make a huge difference. You may use 10% more air. You are no where near the max MAF load on a non boosted S4/GT so there is plenty of MAF load left to give more fuel as required. S4s normally run quite rich on the top end. That is if the MAF is good. I'll attach a dyno sheet I did last week on my S4 with an X pipe and stock S4 rear exhaust, and new MAF. One run shows the effect of the stock LH maps and you can see that it is lean on the bottom and rich on the top. That's pretty normal for a stock S4/GT that isn't boosted. The next run shows the effect of getting the mixture fairly even all across the range. The mixture result is a combination of the part throttle map along with the WOT map enrichment. If the car was boosted, and you were able to achieve similar power (they all will) at less than WOT, you'd run lean unless you used a RRFPR, or re-mapped with the LH. Re-mapping is the way to go. Fuel may be limited by fuel pump or filter so other things enter in too.
Get the X pipe.
https://rennlist.com/forums/attachme...d=128187&stc=1
Mixture tuned.jpg
Last edited by Louie928; 03-18-2008 at 01:11 PM.
07-13-2006, 05:06 PM
#41
Under the Lift
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BTW, I was doing some fiddling with my AFPR and lost track ---what is the stock FP at idle for an S4? Is it 48 PSI, as Andrew mentions above?
07-14-2006, 10:50 AM
#44
Three Wheelin'
Andrew,
There are two fuel maps. IDLE + Cruise is one. The other is the WOT map which can only add more fuel to the values of the IDLE + Cruise map. I am confident that you will be able to completely tune out the tip in issue with the Sharktuner. I was, and our set ups are not all that different. You even helped me post the results, IIRC
DR is right - you will need to spend a bit more time tuning. It took me several hours in the car to get things really sorted out so that as soon as I floor it, I immediately drop to around 12.2 AFR. Zero tip in. Sampling rate from the Sharktuner verified that with 3 samples per second interval, no tip in at all. You will also be able to tune at the top end so that you are not sooo rich. You will gain more power at the top end if you are that rich right now, once you tune to something more in the 12.0 range.
Nice videos by the way!
Edit with link to results - sample size was 10 samples per second! No tip in! I have no doubt that you and / or DR can get you there with a bit more time to play with that wonderful tool that John created for this community.
https://rennlist.com/forums/928-forum/261468-afr-test-results-sharktuned-shark.html
There are two fuel maps. IDLE + Cruise is one. The other is the WOT map which can only add more fuel to the values of the IDLE + Cruise map. I am confident that you will be able to completely tune out the tip in issue with the Sharktuner. I was, and our set ups are not all that different. You even helped me post the results, IIRC
DR is right - you will need to spend a bit more time tuning. It took me several hours in the car to get things really sorted out so that as soon as I floor it, I immediately drop to around 12.2 AFR. Zero tip in. Sampling rate from the Sharktuner verified that with 3 samples per second interval, no tip in at all. You will also be able to tune at the top end so that you are not sooo rich. You will gain more power at the top end if you are that rich right now, once you tune to something more in the 12.0 range.
Nice videos by the way!
Edit with link to results - sample size was 10 samples per second! No tip in! I have no doubt that you and / or DR can get you there with a bit more time to play with that wonderful tool that John created for this community.
https://rennlist.com/forums/928-forum/261468-afr-test-results-sharktuned-shark.html
07-14-2006, 10:56 AM
#45
Supercharged
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Thanks for correcting me, Cameron. Ok... So what I'm experiencing is tip in? Didn't know what tip in was.
I was talking to DR the other day and he said your logs also showed you to be at the max values under Idle + Cruise. Not a bad thing by itslef, but I too am maxed and am getting the tip in. What size injectors are you running?
I also talked to Tom Falkenberg this week and he said his chip set works better than mine on his car. So DR is going to get me a set of his chips to see if its any better. But what I really need to do is schedule up a Dyno tuning session and get it tuned properly.
I was talking to DR the other day and he said your logs also showed you to be at the max values under Idle + Cruise. Not a bad thing by itslef, but I too am maxed and am getting the tip in. What size injectors are you running?
I also talked to Tom Falkenberg this week and he said his chip set works better than mine on his car. So DR is going to get me a set of his chips to see if its any better. But what I really need to do is schedule up a Dyno tuning session and get it tuned properly.