Under 175mph Suit clarification

[TCWorley]

Hey guys,

Rookie driver here hoping to clarify the rulebook notes on necessary suit ratings. The rulebook says the following: "SFI 3.2A/10 or /5 with full Nomex underwear"

So, I'm trying to decipher if 3.2A/10 is goo w/o underwear and I only need it with /5 or if they BOTH require Nomex Underwear? Anyone able to clarify this for me?


Many thanks in advance!

-T.C.

[Stainless1]

Just what it says I believe.... 10 required or a 5 with the added protection of underwear


If you're on fire, you want everything you have.... they listed the minimum... max is a 20 with underwear....

[mc2032]

What Stainless said, no matter what you buy, it will still be cheaper'n a skin graft.  Me, I wear kevlar long underwear under my elephant hide racing leathers and my bike was faster on the trailer than on the salt.

[Seldom Seen Slim]

Nancy and I have Kevlar long underwear under our leathers, too.  Glad to hear we're not the only ones.

[jimmy six]

I believe a 10 is a holdover from many years ago. I don't know if anyone makes them anymore. You are best to find a 15 or it your planning on staying around look for a 20. We have both bought new but already made but would fit. We have a 5 for our 1/2 mile dirt car but only need a 1...I guess we are firesuit poor.

[Jack Gifford]

I agree with Worley that the phrase in the book is ambiguous. It could mean-

1> [SFI 3.2A/10 or /5] with full Nomex underwear

or

2> SFI 3.2A/10 or [/5 with full Nomex underwear]

However, the phrase is defining a minimum requirement, so it's not likely that 1> was meant (more than one minimum).

[Stainless1]

Don't over think it.... you can do a 5 with Nomex underwear... or you can wear a 10.... I have a 15, if you think you will ever go 175... get at least a 15

[TCWorley]

Thanks for the responses, everyone. I'm renting gear, so I just want to show up with the right stuff.

I have some buddies that race and own suits they'd loan me, but they are not labeled as SFI certified. Guessing the FIA certifications aren't accepted? Anyone know?

[Gumby79]

 I read the rule to mean you need a total of 10.
1)SFI 3.2A/10 a suit by itself that is rated 10.
2)"or /5 with full Nomex underwear"
a suit that is rated for 5, + set of underwear Nomex /Kevlar  adds 5 for a total of 10.

[Gumby79]

well 6 years no response


1] looking for contact info for car #172 C/BGMS. did the advice work?
I have pictures  of the car on the 4mile exit road for you.
[/img]DSC_7343   'C-BGMS  172'-2-3[/img]


2] At World Of Speed I got promoted long cores at the 4 1/2 , they titled me  "Montana Dave".

3] hit a chassie dyno  is 490tq wheel enough for 150mph at 2 1/4 ?
If no how much torque do I need [total number needed]?

[deepindebt]

That car belongs to Greg Sharp, he is not on here but does do FB

[Gumby79]

i got ahold of him thank you.

[Stainless1]

3] hit a chassie dyno  is 490tq wheel enough for 150mph at 2 1/4 ?
If no how much torque do I need [total number needed]?

Gumby/Dave... that depends on what you're driving.... If I had 490 torque at the wheel my car would go about 342 according to the speed calculator    :clap   

[71GSSDemon]

well 6 years no response


1] looking for contact info for car #172 C/BGMS. did the advice work?
I have pictures  of the car on the 4mile exit road for you.
[/img]DSC_7343   'C-BGMS  172'-2-3[/img]


2] At World Of Speed I got promoted long cores at the 4 1/2 , they titled me  "Montana Dave".

3] hit a chassie dyno  is 490tq wheel enough for 150mph at 2 1/4 ?
If no how much torque do I need [total number needed]?

Don't you need to be at 175+ at the 1/4 to get licensed for the long course?  I am confused at being promoted to long course at 4 1/2.  Different cars?  You personally as a driver licensed above 175?

[Stan Back]

Page 10 of the 2025 Rule Book.