What is the GTM manual steering rack ratio? Seems really slow..

[beeman]

Does anyone know the GTM rack ratio? I think it's Flaming River, is that correct? To me it seems really slow, is it 20:1? I haven't driven the car, but I don't see a lot of wheel angle with a full turn of the steering wheel. I get it, with manual steering and fat tires...
I added Electric Power Steering and running 7.5 degrees caster, I am thinking that I want at least 15:1, if not a little quicker.
Will any Fox body Mustang manual rack fit? Any recommendations? My rack came installed by previous builder, does the rack need 'extenders' like on the FFR Roadster?
Thanks!
Dave

[VRaptor SpeedWorks, LLC]

This is the info that Dave Borden sent to me for setting up power steering in a GTM:

>
> What you need for Power Steering...
>
> The guy from AGR requested I get him a pressure reading on the pump before
> he can confirm the rack will work well with it. He recommends part number
> 712591 with the 265 torsion bar.( 90-93 mustang Cobra rack Quick ratio)
> It's a custom rack that the Cobra guys find work really well. I spoke to
> Larry... really nice guy. His number is 817 626 9006. AGR is the right
> source for this.
>
> Steering is too light IMHO with a stock mustang rack. Turning it down too
> much with the controller doesn't allow the pump to keep up with a fast
> turn
> of the rack so it catches a bit.
>
> 1x D-tube to Rack adapter from FFR. Tell them you want to install a
> Power Rack in the GTM.
>
> Rack extenders. I believe FFR sells these. They extend the inner
> ball joint out just over an inch to assist in bumpsteer geometry. If they
> dont have them, let me know and I can get a part number for you from FFR.
>
> Electric power steering Pump from a 2001-2005 Toyota MR2. I can give
> you a source for the pump used if you want. YOu want to get the
> plugs/wire
> stubs as well if possible. Makes it much easier to wire! I got mine from
> Gagels 800 537 5948. Dont tell em it's for a hotrod, or they will void
> the
> warranty . Make sure to ask for the pigtails!!
>
> mustang rack AN6 adapter set from breeze automotive #70516
>
> All below ordered from summitracing.com :
>
> 1x AER-FBM1112 45degree #6 ELBOW FTG. FOR TFE
>
> 1x AER-FBM1122 90 degree Hose End, Teflon(r) Racing Hose, 90 Degree,
> Female -6 AN to Female -6 Hose End
>
> 1x AER-FBM1442 90 degree elbow for standard 3/8 hose or pushlock hose.
>
> 1x AER-FBM2241 AN 6 to 16mm
>
> Ive got some of the teflon braided hose I will send you. You have to
> buy 3ft worth and I only used about 6 inches Send me your address.
>
> You can get a standard 3/8 fuel line hose for the return and some hose
> clamps. If you want to get fancy, you can use some of the braided rubber
> hose and those hose
> clamps with the fancy covers. I just went with some regular hose to keep
> it
> simple.
>
> I recommend 75 amp relay and weatherpack connectors. this seems like a
> good source:
> http://rjminjectiontech.com/?p=15
>
> 8-10 gauge wire red and black. (8 is probably better)
>

[beeman]

Thanks for the reply, I want to stick with the manual rack and the GM non-hydraulic electric power steering.
I found the 'what's included' page for the GTM kit, looks like it ships with a 15:1 rack, I'll double check mine, it's a Gen1.

[mike223]

I wouldn't worry about it much until I actually drove it - but here's something you might find useful (combined with EPAS):

https://www.speedwaymotors.com/Speed...er,138447.html

If that turns out to be too much, try the Coleman Machine 22369 (1.5:1):

http://www.colemanracing.com/Steerin...ers-P4753.aspx

[crash]

To answer your question, yes I believe you can. I have never done it on a GTM, but I did swap back and forth between a power and non-power rack on another vehicle previously that used the stock Ford Mustang rack mounts. As I recall, the only thing that was needed was a different bushing in the mounts to offset for the diameter of the valve body in the power setup to space it from the frame. The standard racks are pretty cheap, so you should be able to try with not a whole lot of down side risk.