Race Tracking Your Supra - Information exchange

[razorlab]

has anyone found a basic rear diffuser that isn’t by verus?

Max Orido has a very basic one, not sure if it's even functional.

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[garudathree]

thanks, looked good from behind, the part pic doesn’t seem promising

 

[razorlab]

thanks, looked good from behind, the part pic doesn’t seem promising

Yea that ain’t functional…

 

[Habu]

MFR Engineering has one (aluminum) :

APR diffuser (carbon) :

 

[adawine]

Both of which cost double the price of the Verus diffuser and would have far less of a performance benefit.

With a diffuser being such a niche market compared to that of rear wings, and the already difficult nature of balancing front and rear downforce, I doubt we'll see any other performance minded diffusers for the supra, especially at the Verus price point with proven testing.

Edit: I realize this wording sounds like an ad...oh well

 

[garudathree]

proven to fall off maybe

 

[FLtrackdays]

Both of which cost double the price of the Verus diffuser and would have far less of a performance benefit.

With a diffuser being such a niche market compared to that of rear wings, and the already difficult nature of balancing front and rear downforce, I doubt we'll see any other performance minded diffusers for the supra, especially at the Verus price point with proven testing.

Edit: I realize this wording sounds like an ad...oh well

I’m way behind y’all. Still playing with coilovers ?. This is good to know though

 

[kyle9]

proven to fall off maybe

Honestly, you’ve got to use loctite (blue) when you attach this guy and make sure it’s tight at the start of every weekend.

But outside of Verus, I don’t think there is another functional rear diffuser, with the exception of doing something custom or making the AJ Hartman (or similar) diffuser work.

The Verus one, in my experience, does provide a noticeable performance improvement on track through, both subjectively and in terms of laptimes.

When mine fell off (was not attached properly by the shop that removed and it put it back on) it hurt my lap times a lot more than I expected. I immediately ordered another and made sure to loctite it and haven’t had problems since.

 

[decodeddiesel]

What causes these diffusers to fall off? Is it a fastener failure (broken bolts), a mounting point failure, or do the vibrations cause the fasteners to fall out?

 

[kyle9]

What causes these diffusers to fall off? Is it a fastener failure (broken bolts), a mounting point failure, or do the vibrations cause the fasteners to fall out?

Vibrations will cause the mounting nuts that are closer to the front of the vehicle to loosen. When this happens, the entire diffuser will slide down slightly, get more air going over the top of it, vibrate around, etc and eventually loosen the other mounting nuts. Then eventually the nuts can fall off and the diffuser quickly gets pulled toward the ground as air goes over it instead of under.

This can easily be prevented with locking nuts or loctite.

 

[decodeddiesel]

Vibrations will cause the mounting nuts that are closer to the front of the vehicle to loosen. When this happens, the entire diffuser will slide down slightly, get more air going over the top of it, vibrate around, etc and eventually loosen the other mounting nuts. Then eventually the nuts can fall off and the diffuser quickly gets pulled toward the ground as air goes over it instead of under.

This can easily be prevented with locking nuts or loctite.

Thanks for the information!

 

[razorlab]

When mine fell off (was not attached properly by the shop that removed and it put it back on) it hurt my lap times a lot more than I expected. I immediately ordered another and made sure to loctite it and haven’t had problems since.

What kind of lap time differences did you see?

 

[kyle9]

What kind of lap time differences did you see?

1-1.5s at COTA. Increasing the rear wing to compensate helped but didn't totally close the gap. Subjectively, the rear end felt more responsive with diffuser and less wing angle than just running the wing with higher aoa.

was running 2:26-2:27 laptimes on stock power at the time for reference

 

[razorlab]

1-1.5s at COTA. Increasing the rear wing to compensate helped but didn't totally close the gap. Subjectively, the rear end felt more responsive with diffuser and less wing angle than just running the wing with higher aoa.

was running 2:26-2:27 laptimes on stock power at the time for reference

That’s pretty significant. Also makes sense at COTA since it’s such an open high speed track. What wing angle did you run with the diffuser and also without?

 

[adawine]

1-1.5s at COTA. Increasing the rear wing to compensate helped but didn't totally close the gap. Subjectively, the rear end felt more responsive with diffuser and less wing angle than just running the wing with higher aoa.

was running 2:26-2:27 laptimes on stock power at the time for reference

Are you the Kyle running the Spage wing? Also curious what angle were you running. What's the plan for the new splitter?

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