Re: [Spits] GT6 Bump Steer
One was on the Grass Roots Motorsports website in an article on the Group 44 GT6. The other was in a Triumphtune article on modifying the GT6. it had to do with having to mount the steering rack low to clear the oil pan. Greg ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
Re: [Spits] GT6 Bump Steer
Since I read about this in an article about a racing GT6 it may be an issue when lowering the suspension for racing. The issues were mentioned on a Group 44 GT6. And it evidently made the GT6 a handfull to drive. Greg ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
Re: [Spits] GT6 Bump Steer
And to quote Carter quoting Rick Cline after all that work, I couldn't tell the difference on the racetrack It's there, like it is in virtually every car. And like virtually every car, it's not a big issue. Even 4x4 pickup trucks, which tend to have remarkably horrible bump steer. It's caused by suspension motion. So the easy and very effective band-aid is to limit suspension motion. Most easily done with stiff springs. Not that these cars had a lot of suspension travel anyways. There's nothing unique about the GT6 front suspension compared to the Spitfire. So beware of an article that says something about it being a GT6 problem, but not a Spitfire problem. - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED]; spitfires@autox.team.net Sent: Tuesday, August 14, 2007 7:51 PM Subject: [Spits] GT6 Bump Steer I have read several articles on the fact that the GT6 has bump steer based on the location of the steering arms in relation to the chassis. Has anyone found a cure for this? I am about to look into the issue now that I have the chassis finished and painted. Imagine 37 years old and only two spots that rusted through on the outriggers and the rest is sound! Greg Wolf Bridgewater, Michigan 1970 Triumph GT6+ ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
Re: [Spits] GT6 Bump Steer
Hi Greg and the rest of the lists, Bumpsteer is certainly present in the Spitfire and I'm sure in the GT6 as well. If you want to see it in action take a jack place under your front cross member, take 2 - 2X4 and lay parallel with your front tires, measure roughly the toe setting of your tires and then raise the jack up 1 inch and remeasure (make sure you reset the 2X4 against the tires or you will show the same toe setting :^) I know Rick Cline - he builds many of the parts I use on my SCCA Spitfire and even he will admit tires have came a long way since he was racing. With that said street tires probably aren't as touchy as a 200 degree racing slick to steering input. We bump steer (adjust) the car every time we do a complete suspnsion alignment. My limited prep Spitfire has less than an 1/8in change in its toe setting over 3 inches of suspension travel. My highly modified suspension has zero toe change over 4 inches of suspension travel (2 in bump and 2 in droop) Greg I'm located in Jackson and would be happy to help you bump steer your GT6 and I believe it will make it a better driving car with very little work. If anyone else is interested I could detail out the steps needed to do it in your own garage...but it won't happen for a couple of weeks as I'm leaving for Topeka Friday for a National race and then Gingerman (near South Haven) is the very next week after I get back. [EMAIL PROTECTED] ___ Christopher E. Crisenbery, P.E. Feller, Finch Associates, Inc. 2797 Spring Arbor Rd., Suite B Jackson, MI 49203 p/n (517) 783-0710 fax (517) 783-0711 ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
[Spits] GT6 Bump Steer
I have read several articles on the fact that the GT6 has bump steer based on the location of the steering arms in relation to the chassis. Has anyone found a cure for this? I am about to look into the issue now that I have the chassis finished and painted. Imagine 37 years old and only two spots that rusted through on the outriggers and the rest is sound! Greg Wolf Bridgewater, Michigan 1970 Triumph GT6+ ** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
Re: [Spits] GT6 Bump Steer
??? bump steer? What articles? The Spit and GT6 are identical regarding rack/arm upright steering geometry. Only the rack rates are different. How high does your suspension sit? I can't say I've EVER notice bump steer as an issue. Paul Tegler [EMAIL PROTECTED] www.teglerizer.com - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED]; spitfires@autox.team.net Sent: Tuesday, August 14, 2007 7:51 PM Subject: [Spits] GT6 Bump Steer I have read several articles on the fact that the GT6 has bump steer based on the location of the steering arms in relation to the chassis. Has anyone found a cure for this? I am about to look into the issue now that I have the chassis finished and painted. Imagine 37 years old and only two spots that rusted through on the outriggers and the rest is sound! Greg Wolf Bridgewater, Michigan 1970 Triumph GT6+ ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
Re: [Spits] GT6 Bump Steer
Greg, I seem to remember reading that if the steering rack/tie rods are not level,you will experience bump steer.Shimming the rack up was the suggested cure. I don't remember where I read this and cannot attest to it being true. I am only repeating what I think I read. Bob Harris ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
Re: [Spits] GT6 Bump Steer
On 14 Aug 2007 at 20:35, [EMAIL PROTECTED] wrote: ??? bump steer? ... I can't say I've EVER notice bump steer as an issue. Nor can I. Been driving a Spitfire for 20 years and a GT6 for maybe 5 and I've never felt anything I'd worry about like that. Bump steer could happen if the length of the tie rod isn't the same as the effective A-arm length at that height, or if the outer end of the tie rod doesn't follow a similar arc as the A-arms. I've never bothred to measure things like that but my memory says they aren't far out of whack if they are at all. -- Jim Muller [EMAIL PROTECTED] '80 Spitfire, '70 GT6+ -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.11.17/951 - Release Date: 8/13/2007 10:15 AM ___ Spitfires mailing list Spitfires@autox.team.net http://autox.team.net/mailman/listinfo/spitfires
