04-21-2016, 07:39 PM | #477 |
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I can only imagine what these tunnel covers might do to transmission temperatures. The open tunnel is the only escape for all that hot air flowing under the motor (as designed). Closing the exit door to those gases seems as if is going to produce a small oven around the transmission, driveshaft, and rear diff. Has anybody from Speedfactory done any testing on this effect?
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04-22-2016, 09:34 PM | #478 | |
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I'll need more fill ups with the diffuser to get an average mpg with the diffuser so I can compare the 2 averages and not just a single fill up. I averaged 26.3 mpg before the rear diffuser install. According to my fuel app, I got 25.7mpg on my last tank before the diffuser install. The one and only fill up after the diffuser install came out to 28.3 mpg (my best so far) which is where the app got the 2.6 mpg difference. Once I get more fill ups with the diffuser, I'll be able to better compare the 2 averages but the initial data is already confirming the claims made by Velox of reducing drag. |
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04-23-2016, 01:10 AM | #480 | |
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04-23-2016, 06:32 PM | #481 | ||
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Granted, without temperature probes this is all speculation, but I doubt much heat transfer happens between the case and air passing by it. I would assume if Toyobaru wanted to transfer heat via underbody airflow, they would have included some fins in the cast case similar to Harley heads. These panels actually cover further rearward of the transmission and the air can surely escape behind these. It isn't air tight. My honest thoughts on why OEM does anything here is to keep the passenger compartment from letting in unwanted heat. Personally been using these for 3-4 months without issues in Arizona heat (it's hotter here already than most of the country gets in the summer). Quote:
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04-23-2016, 09:37 PM | #482 |
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@VeloxEric: have you thought of extending those panels further front/back and to sides (judging purely from pic on this page), adding some air escape or directing ribs where needed (IF it panels gets extended), and changing material from aluminium to some lighter and cheaper unpainted plastics? Imho drag then will be further reduced, weight won't be more, cheaper to make (cheaper materials and minus painting costs) and cheaper to ship (less weight). Strength/durability will be compromised, but these are more for track car, not skid pans/sump guards for rallying, right, so maybe current strength is overkill? And due panels resting on underside of car, hits will be distributed to wide area anyway. And if set consisting of cheap plastic panels, one can easily buy replacement one to replace damaged.
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04-26-2016, 02:31 PM | #483 |
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Is anyone running the diffuser with a Q300? Can you please comment on whether spacers are required? Thanks!
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04-26-2016, 04:06 PM | #484 |
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05-18-2016, 03:22 PM | #485 | |
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It's on the website(s) that it fits, she fits . |
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05-18-2016, 05:32 PM | #486 |
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Eric: less rigid - right. But purely for aero purposes? My thoughts on material choice started from looking on OEM underside plastic pieces, so just thought - "what if" and what might be cons/pros .. if one damages one of them, ordering $25-50 single replacement part from set, just as if oem underside one would be replaced, shouldn't be expensive and may offset less strength (&weight &price).
Imho another way = hybrid material choice. Alu - where some extra protection might be beneficial (above tranny/gear shaft/diff for example .. maybe above running hot exhaust too), plastics - elsewhere (flat car body underside areas). But then again - for track, not rally, so why protect at all even partially? For reducing air drag function only, in lighter and cheaper way. Just as OEM panels. |
05-22-2016, 12:37 PM | #487 |
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About to order the non aggressive diffuser, looked at the install video and notice they us the bottom sway bar bolt, any fitment issue with the usdm trd sway bars? I ask because I remember using a weird spacer bracket when installing the sways
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05-22-2016, 05:25 PM | #488 |
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What are they a solution to?
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05-24-2016, 08:43 PM | #489 |
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I just installed my diffuser and so far I'm really happy with it. The extra rigidity from the diffuser stopped my bumper/trunk from rattling on cold start. It also seems to have changed the tone of my exhaust, reducing the drone.
However, I am a little concerned about the fitment with the passenger side muffler on my nameless axle back. The diffuser is installed on the lowest setting and seemed to have about a 1/4" of clearance when I first installed it but after inspecting it two days later it appears to be touching. There are no rattles so I'm OK with how it sits but I am curious how the diffuser will handle the heat in the long run. Do you guys think I should stack up some more spacers to increase the gap or leave it as is? |
05-24-2016, 09:21 PM | #490 | |
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I don't see it having any issues with other swaybars, should still be able to install. |
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