Installing SFI 5 or 6-Point Harness in E91 for Time Trials

minaret · 02-28-2016, 01:24 PM

Moving up to time trials and safety requirements require SFI or FIA 5- or 6-Point harness. My E91 with factory sport seats is still a DD. The more I search, the more complicated fitting a harness becomes due to possible rollover scenarios. Are you using a bolt-in roll bar or harness bar? Did you modify your factory sport seat for sub straps or opt for a race seat?

Cloud9blue · 02-28-2016, 01:44 PM

Quote:

Originally Posted by minaret

Moving up to time trials and safety requirements require SFI or FIA 5- or 6-Point harness. My E91 with factory sport seats is still a DD. The more I search, the more complicated fitting a harness becomes due to possible rollover scenarios. Are you using a bolt-in roll bar or harness bar? Did you modify your factory sport seat for sub straps or opt for a race seat?

Do not run factory seats with 5 or 6-point harness! If you want to stay with factory seats, the most you can do is a 4-point Schroth Quick Fit or Quick Fit Pro.

You best bet is ditch the factory seat all together, if the rules requires 5 or 6 point.

Why do time trial with a E91 on N51 engine, just wondering? Doesn't seem like it would be competitive at all for a car of that size. To be honest, I would recommend another car for that kind of events.

justpete · 02-28-2016, 05:52 PM

Quote:

Originally Posted by minaret

Moving up to time trials and safety requirements require SFI or FIA 5- or 6-Point harness. My E91 with factory sport seats is still a DD. The more I search, the more complicated fitting a harness becomes due to possible rollover scenarios. Are you using a bolt-in roll bar or harness bar? Did you modify your factory sport seat for sub straps or opt for a race seat?

Cloud9blue nailed it - don't attempt to run stock seats with any harness system that has anti-sub straps as you'd have to cut a hole in the seat. Yes, you can use the Profi anti-sub strap with the Quick Fit Pro if you had racing shell seats but it's not that great an idea. A roll bar (professionally installed) and a true six point harness with race shells is the only way to meet the requirements. Ain't cheap though, going to cost six to seven grand if done right.

minaret · 03-01-2016, 11:07 PM

Cloud9blue and justpete: thanks for clarifying the harness issues. Race seats aren't practical in my DD. I'll just stick with HPDE, and eventually get a track car.

02-28-2016, 01:24 PM	#1
minaret Private First Class 57 Rep 114 Posts Drives: 2008 E91 ZSP Join Date: Apr 2007 Location: Hi Desert, Ca iTrader: (0) Garage List 2008 328i Sport Wagon [0.00]	Installing SFI 5 or 6-Point Harness in E91 for Time Trials Moving up to time trials and safety requirements require SFI or FIA 5- or 6-Point harness. My E91 with factory sport seats is still a DD. The more I search, the more complicated fitting a harness becomes due to possible rollover scenarios. Are you using a bolt-in roll bar or harness bar? Did you modify your factory sport seat for sub straps or opt for a race seat? __________________ 2008 E91, ARC-8, 255/40/17 NT01, ER sport cooler, TCK camber plates, coil-overs 400# front 700# rear, Koni SA shocks. M3 Subframe bushings, front + rear control arms, tension struts, strut brace. Quaife, Carbotech, Schroth.
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03-01-2016, 11:07 PM	#4
minaret Private First Class 57 Rep 114 Posts Drives: 2008 E91 ZSP Join Date: Apr 2007 Location: Hi Desert, Ca iTrader: (0) Garage List 2008 328i Sport Wagon [0.00]	Cloud9blue and justpete: thanks for clarifying the harness issues. Race seats aren't practical in my DD. I'll just stick with HPDE, and eventually get a track car. __________________ 2008 E91, ARC-8, 255/40/17 NT01, ER sport cooler, TCK camber plates, coil-overs 400# front 700# rear, Koni SA shocks. M3 Subframe bushings, front + rear control arms, tension struts, strut brace. Quaife, Carbotech, Schroth.
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