Triumph Sports Cars

engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)

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ainadude
Jeff Nicolay
Indian Wells, Calif.
(20 posts)

Registered:
03/31/2012 11:23PM

Main British Car:
1976 Triumph Spitfire 1993 Mazda Miata (1.8 liter/5spd)

Bump steer on 76 Spitfire
Posted by: ainadude
Date: May 21, 2014 04:14PM

Hi guys ... been a while. My Miata-engine-in-a-Spitfire debacle continues. Car is up and running and needs a few tweaks before it's roadable. Apparently there's a potential issue with bump steer and my mechanic is wondering what the specs are, specifically the margin of error. Thing is, he had to lower the rack by 3/4" to clear the crank pulley, which obviously affected the geometry. He says he's got it pretty close but doesn't want to sign off on it until he's confident he's got it within specs. Anyone have those specs handy?


mgb260
Jim Nichols
Sequim,WA
(2463 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Bump steer on 76 Spitfire
Posted by: mgb260
Date: May 22, 2014 06:53AM

Jeff, It's not perfect but, if the tie rods are in the same plane/parallel with the lower control arms at road height you will minimize bump steer.



Edited 1 time(s). Last edit at 05/22/2014 06:54AM by mgb260.


Richard/SIA
Richard Brengman
No. Nevada
(400 posts)

Registered:
01/17/2014 07:47PM

Main British Car:
1969 Triumph GT6+ 225" Buick V6

Re: Bump steer on 76 Spitfire
Posted by: Richard/SIA
Date: July 05, 2014 03:35PM

True correction also requires shortening the rack.
That requires welding skills or paying a certified welder.
Lucky for me I have a spare in case the first try fails.

Look at your angles at full lock to see why there is an issue.
This is well enough known I'm a little surprised no one offers corrected steering racks on an exchange basis.
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