Ground Control / Koni Coilovers (incuding 2005+ STI's) - Page 8

stretch · 06-10-2007, 05:05 AM

Quote:

Originally Posted by 4banger

Are there any more numbers in that model number? I tried searching Koni's site for the dyno plot, but didn't come up with anything. Perhaps the full model number is 8641-1198 Sport?

8641 is the pressurized gas twin-tube strut that Koni sells, which this clearly is.

However, here are two pictures of the 8641-1198 Ground Control struts (just the inserts this time), taken from a BMW site. You can see they are 1.5 inches longer that what Ground Control sold me.
http://www.pbase.com/jt_kgy/m3_gc_konis

4banger · 06-10-2007, 06:52 AM

Now if we could only find a dyno graph for these inserts, we'd be all set.

Quote:

Originally Posted by stretch

8641 is the pressurized gas twin-tube strut that Koni sells, which this clearly is.

ButtDyno · 06-10-2007, 03:58 PM

Yeah, if I hadn't been in such a rush to get them installed (being on the stock struts/alignment for 7 months will do that) I would have taken them to RRT for a dyno.

Full review coming soonish.

john

AnorexicSTI · 06-10-2007, 09:36 PM

Hate to sound like a noob and keep asking stupid questions, but... let me recap.

1. The GC setup gives 3.0" of bump travel (assuming a 1" lowering I think), which is 2.25" more than stock (0.75"). If we use a camber plate like the PDE that takes away 1/2" (approx) of travel, we are down to 1.75"... which is still more than stock... is this sufficient? Or should we go with a lowering camber plate like the RCE that gives 3/8" more traveland end up with 3.375" of travel? Someone mentioned the tire rubbing the fenderwell trim, but is that person using a stock diameter tire (24.9" dia or smaller)? If that person is using 245/45/17 then it will be taller and rub of course.

Regarding camber required, it seems like anything over 3.0 for street and track sacrifices too much acceleration and braking grip... I would think 2.5 would be around optimum... the question then becomes is it really necessary to use a camber plate to get 3.5 deg and then bring it back with the camber bolt to get slightly better suspension geometry?

stretch · 06-11-2007, 02:31 AM

Anorexic, those measurements I spoke of where just estimates based on what Mark told me over the phone. I'll take actual measurements when I get these things installed, which'll be soon.

4banger · 06-11-2007, 03:50 PM

Quote:

Originally Posted by ButtDyno

Yeah, if I hadn't been in such a rush to get them installed (being on the stock struts/alignment for 7 months will do that) I would have taken them to RRT for a dyno.

Full review coming soonish.

john

You just came this close to being my personal hero. It's all good. Can't wait to hear your review.

MTR · 06-13-2007, 08:05 AM

These Koni struts shouldn't clunk like the stockers, right?

ButtDyno · 06-13-2007, 08:08 AM

Yeah. If you have clunking it's probably related to an install issue. They're not inverted

john

4banger · 06-13-2007, 08:08 AM

No, they shouldn't. But, if you go with the GC coilovers, you'll get the typical coilover noises.

4banger · 06-13-2007, 08:17 AM

Butt Dyno, how are youl liking your GC's?

ButtDyno · 06-13-2007, 08:29 AM

I'm about 4 paragraphs into the full review; should be quite the epic when it's finished. Short version: I went with 400f 450r springs. Ride quality on the highway is only slightly harsher than stock WRX struts with Prodrives. There were some noises at first related to the install but now all I get is some minor spring/spring perch noise from the rear on harsh bumps.

I had the fastest street tire time at the autox test n' tune on Sunday, 2nd fastest overall to an FFR Cobra on massive Hoosiers. The shocks soaked up the bumps on the rough lot amazingly well, and the car was very easy to drive. My alignment has a lot to do with that too I suspect, but either way I was amazingly happy. The car has never turned as well as it turns now. (I have the GC camber/caster plates, -3.5 front, -.8 rear; 27mm front bar, 17mm rear bar; caster plates set for max caster)

I have some larger / more competitive autocrosses coming up - Fedex, then the DC ProSolo and then the Northeast Divisional, plus a school this Friday where some national-level guys will get to drive the car. A thorough review is coming, just need time to write it

john

4banger · 06-13-2007, 08:39 AM

John - that's great news. I can't wait to read your epic review. Being able to compare your set up with "stiff" springs and Stretch's setup with "soft" springs should make for an awesome comparison.

karr1008 · 06-13-2007, 09:21 AM

Subscribed!

Well, I've read all through out this thread and wanted to ask "possibly a dumb noobie question", which set up, combo parts from GC would be best for autoX? I just want the best possible combo at a reasonable price range..say 1000 as a max budget.

Thanks.

ButtDyno · 06-13-2007, 09:21 AM

*gets ideas about using his Chase-Cam on the rear fender and driving over an iffy stretch of highway*

waktasz · 06-13-2007, 09:32 AM

So do I want these or the RCE Tarmac2 coilovers?!? Decisions decisions.

Alreay planning my suspension for next season

06-10-2007, 03:58 PM	#108
ButtDyno NASIOC Spy Car: 1998 ///M3, 2003 WRX Fav Mod: Konis Location: #996 on Big-Boards.com Posts: 253 IWSTI Addict since: Mar 2004 Trader Rating: (1)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) Yeah, if I hadn't been in such a rush to get them installed (being on the stock struts/alignment for 7 months will do that) I would have taken them to RRT for a dyno. Full review coming soonish. john

06-10-2007, 09:36 PM	#109
AnorexicSTI Spec C Club Car: 05 WRX STI - Spec A Fav Mod: Starving my STI Location: Lightweightville, Canada Posts: 1,734 IWSTI Addict since: Sep 2006 Trader Rating: (15)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) Hate to sound like a noob and keep asking stupid questions, but... let me recap. 1. The GC setup gives 3.0" of bump travel (assuming a 1" lowering I think), which is 2.25" more than stock (0.75"). If we use a camber plate like the PDE that takes away 1/2" (approx) of travel, we are down to 1.75"... which is still more than stock... is this sufficient? Or should we go with a lowering camber plate like the RCE that gives 3/8" more traveland end up with 3.375" of travel? Someone mentioned the tire rubbing the fenderwell trim, but is that person using a stock diameter tire (24.9" dia or smaller)? If that person is using 245/45/17 then it will be taller and rub of course. Regarding camber required, it seems like anything over 3.0 for street and track sacrifices too much acceleration and braking grip... I would think 2.5 would be around optimum... the question then becomes is it really necessary to use a camber plate to get 3.5 deg and then bring it back with the camber bolt to get slightly better suspension geometry?

06-11-2007, 02:31 AM	#110
stretch Silver Member Car: Aspen 2005 STi Fav Mod: TurnInConcepts Coilovers Location: Silver Spring, MD Posts: 1,864 IWSTI Addict since: Mar 2006 Trader Rating: (2)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) Anorexic, those measurements I spoke of where just estimates based on what Mark told me over the phone. I'll take actual measurements when I get these things installed, which'll be soon.

06-13-2007, 08:05 AM	#112
MTR Junior STI Driver Car: 05 STi Location: Orlando, FL Posts: 92 IWSTI Addict since: Sep 2005 Trader Rating: (0)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) These Koni struts shouldn't clunk like the stockers, right?

06-13-2007, 08:08 AM	#113
ButtDyno NASIOC Spy Car: 1998 ///M3, 2003 WRX Fav Mod: Konis Location: #996 on Big-Boards.com Posts: 253 IWSTI Addict since: Mar 2004 Trader Rating: (1)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) Yeah. If you have clunking it's probably related to an install issue. They're not inverted john

06-13-2007, 08:08 AM	#114
4banger Professional STI Racer Car: 05 WRB STi Fav Mod: TiC AST's - 7/6K Location: Chesapeake, VA Posts: 624 IWSTI Addict since: Feb 2005 Trader Rating: (3)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) No, they shouldn't. But, if you go with the GC coilovers, you'll get the typical coilover noises.

06-13-2007, 08:17 AM	#115
4banger Professional STI Racer Car: 05 WRB STi Fav Mod: TiC AST's - 7/6K Location: Chesapeake, VA Posts: 624 IWSTI Addict since: Feb 2005 Trader Rating: (3)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) Butt Dyno, how are youl liking your GC's?

06-13-2007, 08:29 AM	#116
ButtDyno NASIOC Spy Car: 1998 ///M3, 2003 WRX Fav Mod: Konis Location: #996 on Big-Boards.com Posts: 253 IWSTI Addict since: Mar 2004 Trader Rating: (1)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) I'm about 4 paragraphs into the full review; should be quite the epic when it's finished. Short version: I went with 400f 450r springs. Ride quality on the highway is only slightly harsher than stock WRX struts with Prodrives. There were some noises at first related to the install but now all I get is some minor spring/spring perch noise from the rear on harsh bumps. I had the fastest street tire time at the autox test n' tune on Sunday, 2nd fastest overall to an FFR Cobra on massive Hoosiers. The shocks soaked up the bumps on the rough lot amazingly well, and the car was very easy to drive. My alignment has a lot to do with that too I suspect, but either way I was amazingly happy. The car has never turned as well as it turns now. (I have the GC camber/caster plates, -3.5 front, -.8 rear; 27mm front bar, 17mm rear bar; caster plates set for max caster) I have some larger / more competitive autocrosses coming up - Fedex, then the DC ProSolo and then the Northeast Divisional, plus a school this Friday where some national-level guys will get to drive the car. A thorough review is coming, just need time to write it john

06-13-2007, 08:39 AM	#117
4banger Professional STI Racer Car: 05 WRB STi Fav Mod: TiC AST's - 7/6K Location: Chesapeake, VA Posts: 624 IWSTI Addict since: Feb 2005 Trader Rating: (3)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) John - that's great news. I can't wait to read your epic review. Being able to compare your set up with "stiff" springs and Stretch's setup with "soft" springs should make for an awesome comparison.

06-13-2007, 09:21 AM	#118
karr1008 The Next Petter Solberg Car: 06 WRB STI Fav Mod: STG2+/Swaybars/RCE blacks coming soon Location: STI endangered species la Posts: 904 IWSTI Addict since: Jul 2006 Trader Rating: (2)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) Subscribed! Well, I've read all through out this thread and wanted to ask "possibly a dumb noobie question", which set up, combo parts from GC would be best for autoX? I just want the best possible combo at a reasonable price range..say 1000 as a max budget. Thanks.

06-13-2007, 09:21 AM	#119
ButtDyno NASIOC Spy Car: 1998 ///M3, 2003 WRX Fav Mod: Konis Location: #996 on Big-Boards.com Posts: 253 IWSTI Addict since: Mar 2004 Trader Rating: (1)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) gets ideas about using his Chase-Cam on the rear fender and driving over an iffy stretch of highway

06-13-2007, 09:32 AM	#120
waktasz Professional STI Racer Car: 02 Penis Extender Fav Mod: Autotrader.com Location: Philly Posts: 822 IWSTI Addict since: Jan 2006 Trader Rating: (1)	Re: Ground Control / Koni Coilovers (incuding 2005+ STI's) So do I want these or the RCE Tarmac2 coilovers?!? Decisions decisions. Alreay planning my suspension for next season This ad is not endorsed by this member. Please register or login to hide this ad.

New To Site?	Need Help?	More
REGISTER FOR FREE! IWSTI Rules/Signature Rules Create a Member Journal Bookmark IWSTI Tell your friends about IWSTI	Frequently Asked Questions Did you forget your password? Make a suggestion or report a bug Mark Forums Read Contact Us	Member Journals Forum Pictures & Photography Forum GR Series (08+) Marketplace GD Series (03/04-07) Marketplace Hot eBay Deals Forum Beyond Off Topic