LOL, it sounds like an oxymoron, doesn't it?

Linear Rate = The spring compress at the same rate throughout its compression cycle. Racers usually prefer linear rate springs because they are predictable.

Progressive Rate = The spring compresses at a variable rate throughout its compression cycle, usually getting stiffer as it compresses. Street drivers or those who occasionally autocross may prefer progressive rate springs to offer a soft ride under normal street driving conditions, but then stiffen up if the car is maneuvered.

 

Bow to Aviator hes the man if he can do it no one can...................or say what know one knows

 

I hate to say it, but that was really a nubie question, and most everybody who races or autocrosses knows the answer to that question. Most people don't understand suspension theory very well, including a lot of performance shops, and me, lol. BTW, I simplified the answer.

 

Well what can I say? I guess I'm a nubie when it comes to suspension stuff. Thx for the answer.

 

I'm actually pretty bad at suspension, too. The suspension usually just hangs in the breeze or retracts into a cubby hole when an aircraft is flying.

 

bump

 

what are the differences between your kit and pettits???

 

As far as funtionality of the subframe they are the same, the biggest difference is in how we address'd the bumpsteer situation. Pettit modified the spindles and my kit lengthens the steering rack arms with adjustable fittings to correct bumpsteer

 

so your kit has NO bumpsteer whatsoever? doesnt lengthening the steering rack disturb the angles and how everything lines up? since the arms are adjustable do you have to "tune" out the bumpsteer or is the kit pre-set for optimal steering alignment? last question is how safe is lengthening the arms... on such a powerfull/fast car any failure of the steering mechanisim can be catostrophic. thanks! heath

PS got any pictures of whats included in the whole kit?

 

^ ???

also does the engine height differ from that of the pettit kit? (some people that have bought the new pettit kid are having problems with clearance). id like to see a picture of an engine mounted with this kit if that is possible. thanks

 

Any time you change the position of the steering rack you create bumpsteer, the bumpsteer kit let's you readjust the steering rack alignment to reduce bumpsteer to the point that it is not noticeable, as far as being safe it use the same technology that is use on open wheel indy cars to adjust there toe in/out (which is what bumpsteer is....extreme toe in or out). I will get pics of my car, so you can see what it looks like, but the subframe was design'd so there would be enough clearance for the hood.

 

is it preset or do i need to tune bumpsteer out?

 

It all depends on what subframe you use, it is universal it will work with any subframe, but of course I can tell you where what you should set it to if you purchase a subframe from me

 

Sounds great!. How much just for the correction kit? I already have the Rx7Specialties sub-frame.

 

what about autotechmotorsports.com

They claim the rack stays in place and the shifter barely moves from stock??

Any experiences here?

 

I made my own subframe and got the bump steer kit from him.. excellent quality and it helped quite a bit... I dropped my engine down a lot however, so I still have some and I haven't gotten a good alignment on the car yet since I insalled it so I have some toe in that isn't helping anything. It will definitly not break and I'd trust it way more than the modifying the stock spindles by welding on cast iron. cast iron and welding = weak point and breakage...

 

What's up Dragon glad to see you got your kit, once you get a alignment it should help greatly with whatever toe in you have. So hows the car running? I still waiting on a ECU, wiring harness for mine and my Turbo

 

 

 

Thanx Phil for posting the photo's for me.

 

The first set of photos show the hood clearance, the subframe was design'd so that the stock hood would clear the UIM of the 20b. The sceond set of photos shows the bumpsteer kit and where the rack is position'd on the subframe, also I am using solid motor mounts that can be purchase'd along with the subframe kit.

***UPDATE*** I no longer have any spare subframes, anyone wishing to purchase kit MUST supply stock subframe as a core. Price is $1700 for the subframe and bumpsteer kit, turn around is about two weeks from the time stock subframe is recieved

 

Not a problem..

 

No comments on motor location with my subframe?

 

You need to hurry up and get it running

 

I'm trying you know it would go alot faster if you contributed to the cause