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Discussion Starter · #1 ·
You all may remember I was having some fun launching an S60R a couple of weeks ago with 225/17 Wintersport M3s. Between 30 degree temps and the M3s ability to break loose at launch preventing bog, I had some great results. <p>Well, tonight tried some more runs (45 degrees), hoping to see if lightweight OZs would help with the acceleration (trying to quantify the theory about rotating mass). <p>Now there isn't as big of a difference between these OZs and my winter tire set up. 225/45s on 17" Pegs aren't nearly as heavy as my 245/40s on 18" Pegs were. But the 235/40 on 18" OZ Ultraleggeras are still about 5 lbs lighter per wheel/tire I think.<p>Anyways, moot point because I just bog, the Kumho Ecsts SPTs will not break loose. What is cool is you can clearly see the bog on G-Tech graph, hits just after launch at about 12 mph. The black line is a run from a few weeks ago with M3s, three color ones are from tonight. Note how they all pull away from non-bog black line (slower acceleration). <p>Bog is deadly to acceleration as you can see, and you never recover. Being 15 degrees warmer tonight didn't help either.<p><IMG SRC="http://img399.imageshack.us/img399/2596/bog9nf.jpg" BORDER="0">
 

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Re: Dreaded BOG caught on G-Tech ("R" Kelly)

Couldn't help but notice the weight of the vehicle entered was 4120 <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0">
 

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Discussion Starter · #4 ·
Re: Dreaded BOG caught on G-Tech (frankhoffy)

Driver, full tank of gas, nav, jukebox, car seat, junk in trunk etc. <p>Regardless, weight only affects HP calculations, not acceleration info.
 

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Re: Dreaded BOG caught on G-Tech ("R" Kelly)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>"R" Kelly</b> »</i></TD></TR><TR><TD CLASS="quote">Driver, full tank of gas, nav, jukebox, car seat, <b>junk in trunk</b> etc. <p>Regardless, weight only affects HP calculations, not acceleration info.</TD></TR></TABLE><p>I won't ever complain about this junk in the trunk <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p><A HREF="http://www.lowridermagazine.com/features/lrm0504_cover01z.jpg" TARGET="_blank">http://www.lowridermagazine.co...z.jpg</A><p>Forgive me mods, I couldn't resist! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0"> <BR><BR>
<i>Modified by George @ ViVA at 7:02 PM 4-9-2006</i>
 

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Re: Dreaded BOG caught on G-Tech ("R" Kelly)

Concerning rotating mass, it seems that increasing rim size affects performance more than reducing rim weight. According the TireRack's study, a BMW with +1 rim size that weighed 3 lbs lighter than factory still consumed more fuel than stock ( about 1.3 mpg ). A +1 rim that is 7 lbs heavier than stock consumed 1.7 mpg more than stock. I'm also assuming that these findings would apply to performance as well. <p><A HREF="http://www.tirerack.com/wheels/tech/techpage.jsp?techid=108&currentpage=103" TARGET="_blank">http://www.tirerack.com/wheels...e=103</A><br>
 

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Re: Dreaded BOG caught on G-Tech ("R" Kelly)

Well despite the BOG, if I am looking at that correctly, you are putting up some great 0-60 numbers. Even with the "junk in the trunk" <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <p>P.S. Last I remember, and from your sig, you said that you don't have an ecu upgrade right? That makes those numbers even more impressive.
 

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Discussion Starter · #9 ·
Re: Dreaded BOG caught on G-Tech (Vipergtsz3)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Vipergtsz3</b> »</i></TD></TR><TR><TD CLASS="quote">P.S. Last I remember, and from your sig, you said that you don't have an ecu upgrade right?</TD></TR></TABLE><p>That is correct. However, the car shown in the G-Tech graphs has a BSR PPC.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JCviggen</b> »</i></TD></TR><TR><TD CLASS="quote">G-tech, is there anything it cant do<br> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> </TD></TR></TABLE><p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0">
 

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Re: Dreaded BOG caught on G-Tech ("R" Kelly)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>"R" Kelly</b> »</i></TD></TR><TR><TD CLASS="quote"><p>That is correct. However, the car shown in the G-Tech graphs has a BSR PPC.<p><IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> </TD></TR></TABLE><p>Puleezzz.. <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0"> <p>I think you must be about the only one living that lie.
 

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Discussion Starter · #11 ·
Re: Dreaded BOG caught on G-Tech (Johann)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Johann</b> »</i></TD></TR><TR><TD CLASS="quote">I think you must be about the only one living that lie.</TD></TR></TABLE><p>It isn't a lie. My sig does not say I have an ECU mod.
 

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Re: Dreaded BOG caught on G-Tech ("R" Kelly)

<br>I did some hard launches with my MY06 MT and recorded them with my g-timer (Beltronics FX2). I don't ever feel any Haldex bog and don't think I see any haldex bog in my g-timer graphs. My acceleration curves up through and past 12mph run upward smoothly. I'm not making times anywhere near yours "R" Kelly but I'm hopeful that I'm showing the upgraded "instant traction" Haldex has less or maybe no bog at all.<p>Here's how I launched mine for these runs:<br>- rev engine to 2500-3000 RPM<br>- ride out the clutch and apply more throttle<br>- modulate clutch and gas to avoid engin bog<br>- try to get clutch fully engaged as quickly as possible<p>I never break the wheels loose, even if I start at 3000-3500 rpm.<p><IMG SRC="http://img.photobucket.com/albums/v607/field172/G-Timer/set4.jpg" BORDER="0"><p>Don't go nuts analyzing my numbers, my point is to show the acceleration curve for evidence of haldex bog and <B>not</B> to prove the 0-60 or 1/4 mile accuracy of my g-timer. However, if you do look at my numbers in detail you may notice some oddities, but that's for another thread.<p>LTA<br>
 

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Discussion Starter · #13 ·
Re: Dreaded BOG caught on G-Tech (LTA)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>LTA</b> »</i></TD></TR><TR><TD CLASS="quote">Here's how I launched mine for these runs:<br>- rev engine to 2500-3000 RPM<br>- ride out the clutch and apply more throttle<br>- modulate clutch and gas to avoid engin bog<br>- try to get clutch fully engaged as quickly as possible</TD></TR></TABLE><p>Here's how I was launching my '04 (Inga is gone now, in transit to FL). <p>- rev engine to 4000 RPM<br>- simultaneous pull foot off clutch and floor gas pedal<p>Guaranteed to generate bog on '04/'05s unless your tires break loose. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"><p>NOTE: It has also been suggested this may shorten the useful lifespan of your clutch. <br>
 
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