Calling all rules nerds,,,,,,

[Fastfred92]

I have a few rules questions I want to throw out for feedback.....


1. Can I legally change the bolt pattern of my hubs via the use of spacers ( not saying that is a good idea, just asking )

2. If my car allows the rear tubes of the cage to go thru the back glass and the GCR allows rear bars to go thru bulkheads then can I do both? Any reason I can't modify or remove the enging cover if bars pass thru it?

3. Is any modification to the strut housing legal i.e. changing spindle height?

4. Is there any reason why an aluminum underbody plate or pan could not be used to "protect" the fuel lines?

5. If oil coolers can be added or subtracted could my oem cooler be deleted or moved from it's enging mounted setup to a remote setup?

[joeg]

IMHO:

1. Yes

2. Yes

3. No

4. No

[dickita15]

1. Sure. Any wheel stud, bolt, and or nut is permitted. And Wheel spacers are permitted.
2. I think you can modify but not remove.
3. MacPherson strut equipped cars may substitute struts, and /or may use alternate inserts.
Yes if the modification is part of the strut and no other piece that is restricted.
4. I cannot think of any justification for what I think you are suggesting
5. Oil cooler(s) may be added or substituted. Location within the bodywork is unrestricted, provided that it/they are not mounted within the driver/passenger compartment.

Sure but I do not see where you could make a body modification to duct air to the new location.

[Gary L]

I have a few rules questions I want to throw out for feedback.....


1. Can I legally change the bolt pattern of my hubs via the use of spacers ( not saying that is a good idea, just asking )

2. If my car allows the rear tubes of the cage to go thru the back glass and the GCR allows rear bars to go thru bulkheads then can I do both? Any reason I can't modify or remove the enging cover if bars pass thru it?

3. Is any modification to the strut housing legal i.e. changing spindle height?

4. Is there any reason why an aluminum underbody plate or pan could not be used to "protect" the fuel lines?

5. If oil coolers can be added or subtracted could my oem cooler be deleted or moved from it's enging mounted setup to a remote setup?

1 - At first, I thought the wheel spacer allowance would cover this, but that item is defined in a fairly specific manner in the technical glossary, and I don't see any mention of a bolt pattern change there. Having said that, IMO this would be within the spirit of the rules, given all the other allowances (diameter changes) in the "Wheel/Tire" paragraph.

2 - I'm thinking you're okay on the bulkhead pass-through, provided the two bars end up in the same location (common plate). Cut a hole in the engine cover to accomplish this? Yes. Remove the engine cover to do this? I wouldn't think so.

3 - Seems to me that changing spindle height (relative to the suspension pickup points) would not be legal. You're changing the basic geometry, and that's certainly against the spirit, if not the letter.

4 - No allowance here IMO, even in the usually cloak of "safety". You can after all, relocate the fuel lines if you think they're in danger of getting dinged.

5 - I would think the word "substituted" in the oil cooler paragraph allows precisely what you're seeking.

[924Guy]

I'd say that while you can indeed use any strut, yeah, if it results in changing suspension geometry, then that rule trumps it and it's not allowed...

[dickita15]

I'd say that while you can indeed use any strut, yeah, if it results in changing suspension geometry, then that rule trumps it and it's not allowed...

Not to be a pain but what rule are you referring to that would trump the strut change.

[JeffYoung]

9.1.3.d.8 - No other relocation of any suspension mounting point is permitted.

I think that is it. Dick, I've always wondered as well, where is the allowance for modifying the strut tube itself to accept for example wider bodied struts?? I've always assumed that was legal too but now can't find it............................

[dickita15]

9.1.3.d.8 - No other relocation of any suspension mounting point is permitted.

I think that is it. Dick, I've always wondered as well, where is the allowance for modifying the strut tube itself to accept for example wider bodied struts?? I've always assumed that was legal too but now can't find it............................

9.1.3.5.b.2
MacPherson strut equipped cars may substitute struts, and /or may use alternate inserts Spring seat ride height loca­tion may be altered from stock. Remote reservoir struts and/or inserts are prohibited.
It would seem that if the spindle is part of the strut the spindles position relative to the rest of the strut would be unrestricted.
And by the way here is the definition of a pickup point.
Pickup point (Suspension) – The location of attachment of a suspension component on the frame or structure of the car. Pickup point is also re­ferred to as “pivot axis.”

[bamfp]

On #2 are you talking about going through the front bulkhead?

Blake

[Fastfred92]

On #2 are you talking about going through the front bulkhead?

Blake

No, rear only. Mid engine car.

[924Guy]

I guess I stand corrected on the spindle height, given that it's not a pickup point!

As for the bump steer correction - sounds like if you can accomplish it without modifying the steering arm on the knuckle, and using the stock tie rod end, then it's legal?!? But if you wish to, say, replace your stock tie rod ends with a heim joint, bolted with shims to the knuckle, then that's not legal, right? Because then you'd be replacing a stock part with non-factory - unapproved substitution. Correct?

[dickita15]

If you can accomplish a change by changing the strut and just the strut I say it is legal but no other part may be modified.