4/5-point harnesses with stock seats

[razorlab]

Except that's not what a harness bar is for. Anchoring a harness to a harness bar is as bad as using our strut tower brace. Maybe even worse.

If you want a harness, you will HAVE to get a seat that is made for them. If you have a harness, it HAS to be a 5 or 6 point since nobody makes an ASM harness for our car. If you have a fixed back seat (a reclining seat and a harness is NOT safe) and harness, you *should* (The rollover protection for these cars is still up for debate) have a roll bar too (I think that's what people are meaning by "half cage"). I do not believe our cars have viable mount points for harness, so mount it to the roll bar only, NOT a harness bar; that's not what they are for. A roll bar/fixed-back seat/harness all work together. You can have a roll bar without the others, but none of the others without the rest.
This is all from a safety standpoint, despite popular internet opinion and lore. I won't go into all the reasons for the above, as I'm sure you already know. Feel free to take any risks you see fit, of course. We all do it, in some way, all the time hahaha.

Schroth make a FIA ASM harness for any car. I run it in my Supra and the same one in my evo before.

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[kaj]

Schroth make a FIA ASM harness for any car. I run it in my Supra and the same one in my evo before.

I didn't see any on their site. What are we attaching them too?

 

[razorlab]

I didn't see any on their site. What are we attaching them too?

Harness bar or rollbar

 

[kaj]

Harness bar or rollbar

So add a roll bar and a fixed back seat for a harness to pass through but still use an ASM? So you don't have to worry about a way to make a mount for the 5th/6th points?

 

[razorlab]

So add a roll bar and a fixed back seat for a harness to pass through but still use an ASM? So you don't have to worry about a way to make a mount for the 5th/6th points?

Nice thing about the Schroth FIA harness is that you can add the six point after the fact. Which is exactly what I did.

I used a brey-krause sub belt mount: https://www.bkauto.com/R_9258_Sub_Strap_Mount_for_BK_Side_Mount_System_p/r-9258.htm

 

[kaj]

Nice thing about the Schroth FIA harness is that you can add the six point after the fact. Which is exactly what I did.

I used a brey-krause sub belt mount: https://www.bkauto.com/R_9258_Sub_Strap_Mount_for_BK_Side_Mount_System_p/r-9258.htm

Do you happen to remember which harness you used? I see a generic ASM 4pt but nothing where you can add extra straps.

 

[razorlab]

Do you happen to remember which harness you used? I see a generic ASM 4pt but nothing where you can add extra straps.

Here you go:https://www.schrothracing.com/item/profi-ii-asm/fia-4-point-asm

 

[srwhitman]

For 4 point, I've used this: https://competitionmotorsport.com/p...MIoIiA25KU_QIVoxXUAR3G_gXhEAQYASABEgLK8fD_BwE
I am not 100% sure but I believe Schroth may be the only company that makes a true ASM 4 point. On the other hand, its really not that great in securing you in. That 5th (or really 5/6 points) really help keep you secure. I figure the sub is the least of the issues.

@Tsuki8 that pic you show of Toyota doing it is rather unbelievable. That is way too wide. A HANS would never work with this - which is one of the reasons I want a true harness (the other being to hold one in better).

@razorlab Care to describe how easy it is to defeat the airbag light? I can tell you on my 2018 Porsche it was a PITA. I had to retain all the airbag hardware including the bladder that measures weight and store it in between the seat mount and seat. Then I had to recode the car with a Porsche specific OBD2 reader to tell it to reset the airbag. I have Carly which can do similar things on BMW's but never tried to do this particular thing to a BMW so I have no idea if it will work.

Also, I spoke to a guy today who said that the older ECU (2020) is easier to deal with than the 2022+ ECU. I gather the older one allowed programming and the newer one may have some hack prevention or something that makes it harder.

I feel like between a rock and a hard place. Everyone keeps saying its "possible" but until its proven, well, that seems like a pipe dream to me.

 

[Tsuki8]

For 4 point, I've used this: https://competitionmotorsport.com/p...MIoIiA25KU_QIVoxXUAR3G_gXhEAQYASABEgLK8fD_BwE
I am not 100% sure but I believe Schroth may be the only company that makes a true ASM 4 point. On the other hand, its really not that great in securing you in. That 5th (or really 5/6 points) really help keep you secure. I figure the sub is the least of the issues.

@Tsuki8 that pic you show of Toyota doing it is rather unbelievable. That is way too wide. A HANS would never work with this - which is one of the reasons I want a true harness (the other being to hold one in better).

@razorlab Care to describe how easy it is to defeat the airbag light? I can tell you on my 2018 Porsche it was a PITA. I had to retain all the airbag hardware including the bladder that measures weight and store it in between the seat mount and seat. Then I had to recode the car with a Porsche specific OBD2 reader to tell it to reset the airbag. I have Carly which can do similar things on BMW's but never tried to do this particular thing to a BMW so I have no idea if it will work.

Also, I spoke to a guy today who said that the older ECU (2020) is easier to deal with than the 2022+ ECU. I gather the older one allowed programming and the newer one may have some hack prevention or something that makes it harder.

I feel like between a rock and a hard place. Everyone keeps saying its "possible" but until its proven, well, that seems like a pipe dream to me.

I completely agree on the harness. Can slip out since too wide.
Just SEMA things, I guess.

Easy way you can defeat the airbag on the Supra by with 3.3Ohm resistors.
The Supra's circuitry uses resistance to measure if the airbags are there.
Or as you mentioned, find someone that can code it out.

 

[kaj]

I used a Schroth ASM harness in another car. If you are tightening the lap belts before the shoulder straps, there is no way you should feel like you are falling out or otherwise unsafe.

 

[DarkZupra]

Care to describe how easy it is to defeat the airbag light?

Easy to code out. If youre unfamiliar with BMW coding someone can remote code it for you for $100 or less.

Also, I spoke to a guy today who said that the older ECU (2020) is easier to deal with than the 2022+ ECU. I gather the older one allowed programming and the newer one may have some hack prevention or something that makes it harder.

This only pertains to engine tuning, not feature (read airbag warning) coding.

 

[razorlab]

@razorlab Care to describe how easy it is to defeat the airbag light? I can tell you on my 2018 Porsche it was a PITA. I had to retain all the airbag hardware including the bladder that measures weight and store it in between the seat mount and seat. Then I had to recode the car with a Porsche specific OBD2 reader to tell it to reset the airbag. I have Carly which can do similar things on BMW's but never tried to do this particular thing to a BMW so I have no idea if it will work.

Also, I spoke to a guy today who said that the older ECU (2020) is easier to deal with than the 2022+ ECU. I gather the older one allowed programming and the newer one may have some hack prevention or something that makes it harder.

I feel like between a rock and a hard place. Everyone keeps saying its "possible" but until its proven, well, that seems like a pipe dream to me.

Not a pipe dream. Proven and easy. ? I even wrote up a how-to:https://www.supramkv.com/threads/airbag-error-lights-warnings-easy-coding.14617/

 

[srwhitman]

Thanks guys!
I have a 2016 BMW M3 - I've used Carly with that car with my iphone - anyone know if that would work?

 

[razorlab]

Thanks guys!
I have a 2016 BMW M3 - I've used Carly with that car with my iphone - anyone know if that would work?

Nope, only protool or ISTA.

 

[razorlab]

I completely agree on the harness. Can slip out since too wide.
Just SEMA things, I guess.

Easy way you can defeat the airbag on the Supra by with 3.3Ohm resistors.
The Supra's circuitry uses resistance to measure if the airbags are there.
Or as you mentioned, find someone that can code it out.

Having done this, it will only get rid of the airbag error. You will still have the seat position error.

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