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Old 10-05-2014, 09:13 AM   #1
dragosid
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Exclamation Strapping on Dyno for F/I ?

After long searches and many conflicting suggestions I'm still not sure what the consensus is for strapping our F/Ied cars (with over 600whp/tq) to prevent this from happening...



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Old 10-05-2014, 10:55 AM   #2
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Ground Control sells a metal tab that you bolt between the bottom of the rear shock body, and the trailing arm body. They are pictured below with their adjustable rear lower control arms:




I've also used snatch straps around the bottom of the rear subframe, and then connected the ratchet straps to those.

There is also something called "J" hooks that you can insert into a slot under where the plastic jacking points are. You then cross-strap from there forming an "X" with the straps to clear the tires.

A more extreme solution is to unbolt your entire rear bumper assembly, and connect plates to the back for straps to attach to. That's what I did with the black car:







On the silver car, I planned ahead and had attachment points welded into the compartment to house the surge tank:





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Old 10-05-2014, 12:27 PM   #3
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Strapping on Dyno for F/I ?

Best investment if you dyno your car often.

http://www.akgmotorsport.com/catalog...aneous%20Items


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Old 10-05-2014, 12:46 PM   #4
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Best investment if you dyno your car often.

http://www.akgmotorsport.com/catalog...aneous%20Items


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I have those and they are pretty weak - My dyno guy wouldn't put the straps on them.
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Old 10-05-2014, 12:47 PM   #5
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I use the same metal tabs as above except mine were made by LAB22, they're a bit beefier...many dyno pulls later no issue on multiple cars making between 700-1000rwhp.
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Old 10-05-2014, 12:50 PM   #6
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I use the same metal tabs as above except mine were made by LAB22, they're a bit beefier...many dyno pulls later no issue on multiple cars making between 700-1000rwhp.
Cool - I will have to order a set from them!
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Old 10-05-2014, 01:24 PM   #7
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Strapping on Dyno for F/I ?

Quote:
Originally Posted by Commanderwiggin View Post
I use the same metal tabs as above except mine were made by LAB22, they're a bit beefier...many dyno pulls later no issue on multiple cars making between 700-1000rwhp.

I just ordered as set myself from Lab22 last week... Very good idea and saves equipment.
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Old 10-05-2014, 04:44 PM   #8
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Hey Adam,

thanks for the thorough advice! Will look into them each... I've just bought myself these on Anthony's advice
(UUC's) I would assume they're considered safer as they're steel as opposed to hardened aluminum (previously). Should I employ any particular method if I'd still use these (plus the rear tow hook as a secondary safety net)

OR shall I completely avoid camber arms strapping? I would assume any attachment to camber arms under load would change suspension/tire angles and affect the readings anyway!? Or am I wrong...?


Hey Ken, thanks for the suggestion... do you happen to have any pics of them or point out where to buy them from + details of use?

Thanks!
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HPF Stage 2.5 - 739rwhp & 581ft-lbs SAE
best 1/4 mile (ST2) 11.77'@123mph 1.9' R/T on Toyo R888 295/30/19
Porsche Cayenne Turbo S - stock

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Old 10-05-2014, 05:18 PM   #9
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Originally Posted by dragosid View Post
hey adam,

thanks for the thorough advice! Will look into them each... I've just bought myself these on anthony's advice
(uuc's) i would assume they're considered safer as they're steel as opposed to hardened aluminum (previously). Should i employ any particular method if i'd still use these (plus the rear tow hook as a secondary safety net)

or shall i completely avoid camber arms strapping? I would assume any attachment to camber arms under load would change suspension/tire angles and affect the readings anyway!? Or am i wrong...?


Hey ken, thanks for the suggestion... Do you happen to have any pics of them or point out where to buy them from + details of use?

Thanks!

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Old 10-05-2014, 10:25 PM   #10
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I would not put any straps on the lower control arm.

Get some tabs.
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Old 10-06-2014, 08:10 PM   #11
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We always use t hooks in the slots that the jack pads clip into. Make an x off the back of the car with two straps. I would be very cautious strapping off the shock bolt, especially since the straps are usually pulling in a different direction than the bracket bolted to the shock. You could follow Adams lead and weld tabs to the car. I have a set of tie down tabs that I plan on welding to the rear subframe to speed up Dyno time
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Old 10-06-2014, 08:54 PM   #12
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Mike would know.

Pics:

http://www.bimmertools.com/t-hooks-p/11-7a-lba.htm

http://store.bimmerworld.com/trailer...of-4-p455.aspx



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Old 10-07-2014, 04:26 AM   #13
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Originally Posted by mike@maximumpsi View Post
We always use t hooks in the slots that the jack pads clip into. Make an x off the back of the car with two straps. I would be very cautious strapping off the shock bolt, especially since the straps are usually pulling in a different direction than the bracket bolted to the shock. You could follow Adams lead and weld tabs to the car. I have a set of tie down tabs that I plan on welding to the rear subframe to speed up Dyno time
Fully agree Mike, those bolts don't inspire much confidence but I may be biased after what happened...

I'm seriously considering the T Hooks and X pattern for strapping - that seems to be the strongest, non-welded option....
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best 1/4 mile (ST2) 11.77'@123mph 1.9' R/T on Toyo R888 295/30/19
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Old 10-07-2014, 10:53 PM   #14
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Hello, so is there point to putting the straps in the front of the car for the dyno run (only for certain dyno's ???), eg. strap down at the front wheels?

Some dyno runs, i see no straps at the back of the car, and just the front tie down straps, mostly through the front wheels.

Thanks.
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Old 10-07-2014, 11:40 PM   #15
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Quote:
Originally Posted by gixxer View Post
Hello, so is there point to putting the straps in the front of the car for the dyno run (only for certain dyno's ???), eg. strap down at the front wheels?

Some dyno runs, i see no straps at the back of the car, and just the front tie down straps, mostly through the front wheels.

Thanks.

For my car when it's pushing over the 650 wheel mark front straps r needed. Dyno dynamics.
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Old 10-08-2014, 03:05 PM   #16
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What about 500whp power level would those metal tabs attached to the shock bolt be safe? I was going to order those for my vert and dyno it within next couple weeks until you mentioned this...
Quote:
Originally Posted by mike@maximumpsi View Post
We always use t hooks in the slots that the jack pads clip into. Make an x off the back of the car with two straps. I would be very cautious strapping off the shock bolt, especially since the straps are usually pulling in a different direction than the bracket bolted to the shock. You could follow Adams lead and weld tabs to the car. I have a set of tie down tabs that I plan on welding to the rear subframe to speed up Dyno time
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Old 10-08-2014, 04:25 PM   #17
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What about 500whp power level would those metal tabs attached to the shock bolt be safe? I was going to order those for my vert and dyno it within next couple weeks until you mentioned this...
IMO anything that could possibly change the angle of the wheel and contact patch with the roller even if it does strap the car down it may affect readings and skew the whole point of dynoing ...
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HPF Stage 2.5 - 739rwhp & 581ft-lbs SAE
best 1/4 mile (ST2) 11.77'@123mph 1.9' R/T on Toyo R888 295/30/19
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Old 10-08-2014, 04:30 PM   #18
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Fully agree Mike, those bolts don't inspire much confidence but I may be biased after what happened...

I'm seriously considering the T Hooks and X pattern for strapping - that seems to be the strongest, non-welded option....
Found these instructions ...

http://www.tunnellracing.com/thookTN.html
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Pulled the trigger! Built engine + 6766 Dual BB + Open Dump + 15/23 PSI - Holy F#@$ this build is insane!

HPF Stage 2.5 - 739rwhp & 581ft-lbs SAE
best 1/4 mile (ST2) 11.77'@123mph 1.9' R/T on Toyo R888 295/30/19
Porsche Cayenne Turbo S - stock
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Old 10-09-2014, 12:09 PM   #19
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Originally Posted by mike@maximumpsi View Post
We always use t hooks in the slots that the jack pads clip into. Make an x off the back of the car with two straps. I would be very cautious strapping off the shock bolt, especially since the straps are usually pulling in a different direction than the bracket bolted to the shock. You could follow Adams lead and weld tabs to the car. I have a set of tie down tabs that I plan on welding to the rear subframe to speed up Dyno time
Anyone have any pics of this set up?
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