PitStopUSA.com - Simpson Racing Suits

Simpson SFI 5 auto racing suits have set the standard through the years for being lighter and more breathable. Choosing trusted fabrics like Nomex and CarbonX makes all the difference and allows Simpson Race Products to guarantee that you're wearing the best.

When shopping for a new race suit you want to compare the differences so that you are able to find the best suit that fits your budget. If you are looking to keep your suit cost down your most affordable option is single layer suits which carry an SFI-1 rating. Such as the Velocity 1 Race Suit. We recommend it to drivers looking for an affordable suit since it has an outstanding TPP rating of 10.2. Although what many people dont realize with new materials like Proban / Pyrovatex you can get yourself into a SFI-5 Multi-layer suit with out destroying your racing budget. The Crow Quilted Two Layer Proban Driving Suit is a very popular choice for any driver looking for an entry level suit. Even in the lower priced SFI-5 suits you can still find a suit that has a custom look to it such as the Velocity 5 Multi-Layer Race Suit with its Euro styling it will get you noticed by everyone. If you wanted a suit made with lightweight material such as Nomex or Aramidic fabric the Alpinestars GP Start Suit is a good place to start. Now if you want suit with features like arm gussets and a stretch panel in the back take a look at the Alpinestars GP Race Suit or the Simpson Crossover Racing Suit. They are2 of our top of the line SFI-5 suits with the GP Race being a ultra-light 3-layer suit offering superior protection with out the feeling of a bulky suit. Now dont forget that the best way to keep that new suit clean is with Molecule Wash which is specifically designed for caring for technical fabrics.

There are basically two types of auto racing suits: Single Layer Suits and Multi-Layer Suits. In addition, you have one or two piece auto racing suits. We recommend that drivers wear one-piece suits, and crewmen can choose from from either type depending upon their responsibities.

While racing suits are most commonly identified by their SFI or FIA ratings, the TPP rating is the best measure of a particular racing suits protection level.  TPP ratings are an indication of how long a suit will protect you before you would incur a second degree burn. The TPP rating is divided in half to determine the number of seconds until the human tissue reaches a second-degree burn. For example, if a particular fabric has a TPP rating of 35, it takes 17.5 seconds until a second-degree burn occurs in a flashover situation.

The TPP rating is calculated from a mathematical formula that relates the heat transferred through the garment material to the amount of energy that would be required to cause a second degree burn. TPP results are typically reported as a rating. The TPP rating is the time to incur a second degree burn multiplied by the heat exposure level that the material is exposed. The higher the garment TPP rating, the more time that is required before a second degree burn will occur. The chart below outlines the SFI ratings based on TPP results (shown to the right of the slash mark on the driver suit patch) with the corresponding times to a second degree burn:

SFI Rating	SFI Name	TPP Rating	Time to 2nd Degree Burn	Comments
SFI 3.2A/1	SFI-1	TPP 6	3 Seconds	Common Single Layer Suit
SFI 3.2A/5	SFI-5	TPP 20	10 Seconds	Common Multi-Layer Suit
SFI 3.2A/15	SFI-15	TPP 38	19 Seconds	Used for Drag Racing Applications
SFI 3.2A/20	SFI-20	TPP 80	40 Seconds	Used for Top Fuel Drag Racing

 

TPP rating can vary within an SFI Rating, for example SFI 3.2A/5 rated suits (commonly called SFI-5) are available with TPP ratings anywhere from 19 to 26 depending on the number of layers and the fire-retardant material used to construct the suit. The only way to increase a TPP rating is through adding multiple layers. However, as you increase layers, suits get bulkier, and bulk does not equal comfort. Your goal in selecting a firesuit should be the balance of comfort with maximum protection. The majority of racers in the US are currently using a 2 or 3-layer SFI-5 rated suit.

The easiest and best way to to increase TPP is to wear Fire Retardant Underwear under you firesuit.  These garments are typically made of Nomex, CarbonX, or other FR such as Kermel and Lenzing Materials.  It is highly recommended that any driver wear fire-retardant underwear to improve TPP and better protect against injury.