NoCoast Grant Hughes Senior Moderator Location: Whitefish, MT Join Date: 01/11/2006 Age: Midlife Crisis Posts: 6,818 Rally Car: BMW |
Thanks John. We'd discussed bolt protection and much more complicated (expensive) ways to protect them. That is quite easy and obvious. Thanks! Sadly we don't really rally on rough enough roads to mangle bolts much around these parts. But that doesn't mean it shouldn't be considered. Grant Hughes |
Doivi Clarkinen Banned Junior Moderator Location: the end of the universe Join Date: 02/12/2006 Age: Possibly Wise Posts: 1,432 Rally Car: 1980 Opel Ascona B |
Here's the skidplate I did on Dave Hintz's M3 (sorry about the gigantic picture.):
I like to use counter sunk allen bolts to hold the plate on as they are flush and don't get wiped out by rocks. Also notice the kick up at the front to prevent the front edge of the skidplate from catching on stuff. |
Doivi Clarkinen Banned Junior Moderator Location: the end of the universe Join Date: 02/12/2006 Age: Possibly Wise Posts: 1,432 Rally Car: 1980 Opel Ascona B |
Keep in mind that 1996 and later M3's already have these reinforcements. |
bttmotorsport Jari Hamalainen Ultra Moderator Location: Cape Coral, FL Join Date: 12/12/2010 Age: Possibly Wise Posts: 119 Rally Car: Opel Monza, Chevy Monza to be finished 2012, BMW 318 iS |
I´m again against you all =)... In europe , Finland, Sweden Germany i really don´t know anyone who would drive higher gear than 4.45, in Xtreme cup that´s the ratio used, in grF most use 4.75 to 5.17, or even lower. And the roads really are not that much slower than here. When i drove with Daves BMW, we hardly ever got to 4th gear, And i dont think that ratios should be chosen by considering how nice and quiet the car is on transits (unless you drive 2000 miles on interstate ). You dont win rallies on straights driving 100+ mph, accelerating from the corners is where the difference is made.... For example most R5 cars have top speed of 105mph. No need for more in 99% of the cases... |
DaveK Dave Kern Professional Moderator Location: Centennial Join Date: 07/11/2008 Age: Midlife Crisis Posts: 1,085 Rally Car: Compact M3 & Evo IX |
I learn something new every day. Surprised that you were hardly ever seeing 4th gear...makes me wonder if I'm shifting too early? The new motor doesn't have the M3 cams in it yet (but still running same tune as before), so sorta falls flat over 6000rpm. Wonder if that might be the culprit? Dave |
bttmotorsport Jari Hamalainen Ultra Moderator Location: Cape Coral, FL Join Date: 12/12/2010 Age: Possibly Wise Posts: 119 Rally Car: Opel Monza, Chevy Monza to be finished 2012, BMW 318 iS |
Well, my thinking is that there´s a rev limiter for a reason... =) |
NoCoast Grant Hughes Senior Moderator Location: Whitefish, MT Join Date: 01/11/2006 Age: Midlife Crisis Posts: 6,818 Rally Car: BMW |
Gearing is usually much different in an auto box too. Grant Hughes |
bttmotorsport Jari Hamalainen Ultra Moderator Location: Cape Coral, FL Join Date: 12/12/2010 Age: Possibly Wise Posts: 119 Rally Car: Opel Monza, Chevy Monza to be finished 2012, BMW 318 iS |
Actually not that much... http://en.wikipedia.org/wiki/ZF_4HP22_transmission |
DaveK Dave Kern Professional Moderator Location: Centennial Join Date: 07/11/2008 Age: Midlife Crisis Posts: 1,085 Rally Car: Compact M3 & Evo IX |
Actually not that much... http://en.wikipedia.org/wiki/ZF_4HP22_transmission[/quote] Totally spaced the automatic transmission. 5th in the ZF manual gearboxes is a 1.00 which is identical to the 3rd gear in the automatic. Makes a lot more sense now. Dave |
Andrew_Frick Andrew Frick Godlike Moderator Location: Greenville, SC Join Date: 05/18/2007 Age: Midlife Crisis Posts: 684 Rally Car: Rally Spec Ford Focus |
Dave thank you for your contributions. Any other tips you are willing to share based you experiences with Hintz car? I remember seeing some pictures of a log being used as a suspension spring after a trailing arm failure. Was that just a case of stuff breaks if you hit something hard enough or is there some inherent flaw with multilink BMW stuff that caused the issue? |
bttmotorsport Jari Hamalainen Ultra Moderator Location: Cape Coral, FL Join Date: 12/12/2010 Age: Possibly Wise Posts: 119 Rally Car: Opel Monza, Chevy Monza to be finished 2012, BMW 318 iS |
When you move the rear spring from its original place to coilover, it is more likely to break the shock mount in original trailing arm. Hardly ever seen it when using the original setup.. |
NoCoast Grant Hughes Senior Moderator Location: Whitefish, MT Join Date: 01/11/2006 Age: Midlife Crisis Posts: 6,818 Rally Car: BMW |
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john vanlandingham John Vanlandingham Elite Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
I see this said--and repeated.. And I cannot begin to understand the reasoning since the spring does not create any stress, only the shock does. Please explain. John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. |
DaveK Dave Kern Professional Moderator Location: Centennial Join Date: 07/11/2008 Age: Midlife Crisis Posts: 1,085 Rally Car: Compact M3 & Evo IX |
I think it only matters when things completely bottom out and the shock and/or spring turns completely solid...to infinitiy and beyond! |
NoCoast Grant Hughes Senior Moderator Location: Whitefish, MT Join Date: 01/11/2006 Age: Midlife Crisis Posts: 6,818 Rally Car: BMW |
When the spring fully compresses in the stock location, it will bend arms as the moment of lever is in the middle of the arm. When the spring or shock fully compresses in coilover position, the lever is on that wee little bolt bolted to that little thingie. Hence the idea for a rubber bump stop in stock spring location when using coilovers. Move that stress to the middle of the arm initially and let camber arms (or STA for Compact/E30/Merkur) bend but don't break stuff at coilover hopefully. Want a picture? Coilover bottoms out ____________________________V____| Stock setup bottoms out ______________V__________________| I'm getting a run of chassis reinforcement stuff made. Had the NextEngine down last night scanning stuff. Grant Hughes |