Str8 Six bump steer modification

[Targarama]

Has anyone any experience with the mod? (listed on their website).

I recall there was a vast reported improvement to MK1 Tuscans when suitable spacers are installed, but not anything about the newer T cars.

Anyone?

[softtop]

I am not aware that anyone has reported back on these for a Tuscan Mk1. When you say spacers do you mean under the rack or on the wheel?

[Targarama]

softtop said:

I am not aware that anyone has reported back on these for a Tuscan Mk1. When you say spacers do you mean under the rack or on the wheel?

Under the steering rack.

[tail slide]

Targarama said:

Has anyone any experience with the mod? (listed on their website).

I recall there was a vast reported improvement to MK1 Tuscans when suitable spacers are installed, but not anything about the newer T cars.

Anyone?

I made spacers & fitted under rack last year on the T350 - much tighter for space than Sag. Definite slight improvement. Jason's now fitted the Sagaris steering arms too that he's sourced, which should properly align the arc of the track rods with the arc of the wishbones as it does on the Sag.

I collect it next week & will post the results. My current set-up should highlight any remaining bump steer with stiffer springs/dampers and now nylatron bushes.

Can also compare it with my VX220 - with it's typical Lotus steering unaffected by bumps - down same bumpy B-road.

[Targarama]

tail slide said:

I made spacers & fitted under rack last year on the T350 - much tighter for space than Sag. Definite slight improvement. Jason's now fitted the Sagaris steering arms too that he's sourced, which should properly align the arc of the track rods with the arc of the wishbones as it does on the Sag.

I collect it next week & will post the results. My current set-up should highlight any remaining bump steer with stiffer springs/dampers and now nylatron bushes.

Can also compare it with my VX220 - with it's typical Lotus steering unaffected by bumps - down same bumpy B-road.

Thanks.

Sounds like the mod would be useful then. Especially if it helps with that feeling you get on a bumpy B road as you have to tweak the steering to stop it jumping into a ditch (when driving hard).

What do you mean by tighter for space - clearance somewhere?

[Lensey]

Mmm something else to have done in may I think.

[tail slide]

Targarama said:

What do you mean by tighter for space - clearance somewhere?

Yes - tighter above rack on ours than on the Sag, don't know about Tuscan.

The power steering pipes only have about 3mm above them before they're in contact with the chassis, so that's all I could raise it by but seemed about enough. We'll see, with lower-height steering arm finishing the job.

[TVR Andy]

Going to talk to str8six about doing this to mine when in for service in a couple of weeks.

[glow worm]

I've had my steering rack raised by about 5mm,not moved, thats about the limit on a Tuscan Convertible ... did generate quite a technical topic on the TVRcc site http://www.tvr-car-club.co.uk/forum/forum_posts.as... back in December
Co-incidence this suddenly appears now.


This You Tube video was quite good http://www.youtube.com/watch?v=LO07qmJ9zkk


After raising it

[Basil Brush]

There were a few threads on this last year starting on the Cerbera forum and then onto the Tuscan one. A few of us have used custom made bolts and rose joints to mount the track rod below the steering arm as the angles are a long way out as standard. Combined with the 3mm spacers it has made a big diff to my Mk1 Tuscan, with it now much more at ease on bumpy roads.

The Sagaris steering arms looked to be a better solution but wasn´t aware of them at the time. There´s not enough room to lift the rack enough on a Tuscan anyway.

[tail slide]

Basil Brush said:

There were a few threads on this last year starting on the Cerbera forum and then onto the Tuscan one. A few of us have used custom made bolts and rose joints to mount the track rod below the steering arm as the angles are a long way out as standard. Combined with the 3mm spacers it has made a big diff to my Mk1 Tuscan, with it now much more at ease on bumpy roads.

The Sagaris steering arms looked to be a better solution but wasn´t aware of them at the time. There´s not enough room to lift the rack enough on a Tuscan anyway.

Yes I read those threads, glad it's worked well for you.

Seems I was being lazy for just long enough for Jason to source this easy steering arm fix for mine...

[dvs_dave]

Looks interesting although remarkably similar to the Sagaris steering arms. Would be interested to know if they're any different? Also wonder what thickness those rack spacers are? The Tuscan S already has spacers raising the rack from the factory so wonder if these are any different?

[softtop]

dvs_dave said:

Looks interesting although remarkably similar to the Sagaris steering arms. Would be interested to know if they're any different? Also wonder what thickness those rack spacers are? The Tuscan S already has spacers raising the rack from the factory so wonder if these are any different?

I have quoted dvs_dave because he has contributed technically to a number of threads on this and the club forum. Trackcar has questioned the changes and that the raising of the rack only is not enough. It would be good to get feedback on the lift only of the rack. Also what about other changes that are reasonable to improve the car. My issue is that changes are being made with potentially some worn parts. I have thoughts my rack is worn though people who know more than me say it is ok. If it was like that new I don't think I would have accepted it.

When looking to rectify elements you need to know all working and moving parts are as good as they get.

[Noisy]

My Tuscan S has a couple of spacer plates fitted from the factory, I also have the 3mm wheel spacers, bump steer is still noticeable, but more stable than standard Tuscan's I have driven.

[BCA]

Noisy said:

My Tuscan S has a couple of spacer plates fitted from the factory, I also have the 3mm wheel spacers, bump steer is still noticeable, but more stable than standard Tuscan's I have driven.

Does your Tuscan s have an interesting history?? It seems rather special, bumpsteer mods from the factory, very lightweight...? Would love to know more, 'nemasis' on here may be able to shed some light on it?

[Basil Brush]

I thought all later Tuscans had rack spacers as standard from previous threads, is this not the case?

Lifting the rack alone is nowhere near enough from my experience and from the Cerbera measurements that were on the earlier threads. On my Tuscan, there's probably room to lift the rack by about 10mm tops. Flipping the track rods to below the steering arms must be the equivalent of raising the rack by about 30mm or so, which is what was needed to get the track rod lined up properly with the lower wishbone.

Dave - I assumed these arms from Str8six were Sagaris arms? I know the top upright mounting changed a couple of times on later cars but thought the lower mounting, where the steering arms attaches, was the same throughout.

Softtop - I fitted a new rack and new column at the same time as the bump steer mods. At 50k miles, I had play in the pinion input shaft assembly and in the top UJ of the column, where the steering wheel height adjustment pivots. No effect on bump steer as such but made the steering much less floaty.

Edited by Basil Brush on Tuesday 8th February 18:54

[glow worm]

All later Tuscans should have 5mm spacers as std. between the chassis and rack, I've made mine 10mm now and raised the ride height by 5mm aswell. Plus 225 tyres on the front rather than 255s factory fitted.

[TVR_owner]

glow worm said:

All later Tuscans should have 5mm spacers as std. between the chassis and rack, I've made mine 10mm now and raised the ride height by 5mm aswell. Plus 225 tyres on the front rather than 255s factory fitted.

So the question has to be, on this final evolution of the Tuscan, they still got things so far wrong at the Factory??

Answers on a post card.

[glow worm]

TVR_owner said:

So the question has to be, on this final evolution of the Tuscan, they still got things so far wrong at the Factory??

Answers on a post card.

Like your many modifications on yours John , I'm just giving it a try The tyre change is as the designer design it .
From what I understand raising the rack was something done at the factory at times. Which may be where Jason Clegg got the idea . Where do you think my spacers came from ?

Edited by glow worm on Tuesday 8th February 22:58

[GT TVR]

glow worm said:

All later Tuscans should have 5mm spacers as std. between the chassis and rack, I've made mine 10mm now and raised the ride height by 5mm aswell. Plus 225 tyres on the front rather than 255s factory fitted.

what difference did it make?