SpeedOfLife

iTrader: (16)

I've been trying to find good profile images showing the different stock spoilers, but the trick is knowing which ones are which. Could you guys post some different profile pictures of both? Unless, of course, S4 and S5 spoilers are the same, but my understanding is that they aren't identical.

Eventually I want to buy a spoiler for my '7, but if I'm going to spend much on something that's mostly a visual enhancement for in town driving I want to make sure I get it right (btw I'm really not interested in any aftermarket spoiler options).

Thx

rs1tc

http://www.rotaryresurrection.com/2n...al_2ndgen.html
There are a few profile shots on their, I'm not sure if you checked it out or not. They aren't labled but you should be able to figure out which ones are stock and which are aftermarket.

SpeedOfLife

iTrader: (16)

The last two are S4's, and maybe another one of these is, too. I do know the S5's have the painted to match molding, but on black cars it can be hard to tell from a picture. Still, some of these are difficult to get a straight on side view. From what I can tell maybe the S5 spoilers have a deeper scoop to them than the S4 spoilers. Also, are there more than two stock spoilers for the FC? Btw thanks for the link!

http://www.rotaryresurrection.com/ga..._9_resized.jpg
http://www.rotaryresurrection.com/ga...0-0044_IMG.jpg
http://www.rotaryresurrection.com/ga...river_Side.jpg
http://www.rotaryresurrection.com/ga...-02000180-.jpg
http://www.rotaryresurrection.com/ga...s/fe0ef5aa.jpg
http://www.rotaryresurrection.com/ga.../rearside2.jpg

sunshine

iTrader: (3)

Look at the FAQ at the top of the 2nd gen forum page
-a

CyberPitz

I'm weird, but I have problems determining what the difference is in the s4 and s5 spoiler. If someone could point/tell/slap the information to me, I'd be greatfull!

SpeedOfLife

iTrader: (16)

Yeah, I'm in the same position which is why I'm asking. And the FAQ didn't have anything about the spoilers (it might have said something about the aero package but I need pictures and there were none of spoilers at all).

RoTa7

the s4 and s5 spoiler looks the same and has the same mounting points, but the s5 spoiler sits slighty higher than a s4 spoiler/ the s5 has a higher lift than the s4 (also not taking about 87 sport spoiler).

sonorous7

here's a good pic of the sport spoiler, also known as the duckbill, and it's the one you want:





also, I guess you could consider this stock.. it came from the factory

SpeedOfLife

iTrader: (16)

how can they look the same if one's higher than the other?
and if the sport had a different spoiler I'd like to see what that looked like

edit: I just posted and then saw the pics, thanks!
So now I at least know what the sport spoiler is, and I don't like it. Why do you say it would be the one I'd want though?

sonorous7

Because it's the only one that's actually functional! It helped lower the Cd from .32 to .29 on the Sport. I was halfway joking though; get the one YOU like the best.

SpeedOfLife

iTrader: (16)

Are those numbers in the FAQ (or could you link me to wherever)? Because I'd consider it more if I could compare them all based on aerodynamics. Like I said I feel for my purposes the spoilers I would consider are chiefly visual upgrades, but I do value purposeful modifications (past mere visual appeal).

Also, I suspect that the coefficient of drag you posted is for the WHOLE aero package and not just the spoiler, but having a reference should clear that question up.

rx7racerca

iTrader: (1)

The styling is nearly identical between the S4 and S5 "wing" style spoilers (I say wing because they're actually raised off the rear deck). The S5 is a little deeper/higher off the deck, but you'd be hard pressed to see the difference if they weren't side-by-side. The S4 version has "Mazda" embossed in the middle top, the S5 does not. The S4 ones are pretty rare on NA's, while I think they were standard on s5s (but fewer S5s were sold). All the one's you linked in your post above were S5s, except perhaps the black third one - the car is an s4 na it appears, but it has GTU stickers, and a turbo hood, so who knows, and the hatch is ajar, making it harder to judge the lines at the rear. The larger, non-wing style on the dark red S4 posted above, is one I've never seen before except in the odd pic - but its possible its factory and wasn't sold in Canada. The fact the car appears to have turbo side skirts and the spoiler appears to be three-piece makes me wonder if it's factory - why would it need to be 3-piece, since the rear deck where it mounts is not cut by the hatch? Might be a aftermarket-sourced dealer piece.

As to why want the duckbill - ? Personal preference, or possibly that it might actually generate downforce (unlikely) or reduce drag (as posted above), where it is likely the wing spoiler hurts aerodynamics (ie, extra drag, or even lift generated).

TurboMazdaSpeed

my spoiler.. its a mazdaspeed spoiler from japan (has the mazda speed logo imprinted into it)

sonorous7

How's this?

http://aaroncake.net/RX-7/brochure/b....asp?Number=22
http://aaroncake.net/RX-7/brochure/b....asp?Number=23

It appears I made an error; the Cd was actually lowered from .31, not .32, but you are correct, you would need the entire package to have a Cd of .29

sonorous7

The car you are referring to has the Finishline aero kit. See here:

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/finish-line-aero-package-435419/

It was a dealer installed option so I'd say it's stock.


This on the other hand is not stock, but cool nonetheless.

rx7racerca

iTrader: (1)

It's likely the spoiler is the largest part of the aerodynamic improvement; the only other additions appear to be small strakes added to the sills ahead of the rear tires and to the sides of the front lip, it appears, which could help deflect airflow around the messy area of the spinning tire tread. Wide tires definitely hurt aerodynamics, so that would make sense.

SpeedOfLife

iTrader: (16)

except that the backsides of wheel wells would probably catch a lot of air, the stock wings are streamlined so they shouldn't incur much drag even though they stretch over a the whole back...

sonorous7

..and the undertray.

rx7racerca

iTrader: (1)

Isn't an undertray stock on these cars? Commonly broken, mind you (I've put small cracks in mine from autocross cones I've killed!). I've never seen one without it. Of course, I don't look that much under other 7's, except at the junkyard.

SpeedOfLife

iTrader: (16)

The tray near the front cross member? Yeah I think that was stock, it's at least on my '87 TII...

sonorous7

Sorry to go off topic but to answer the question, the plastic undertray for cooling purposes is stock on all models. The aluminum undertray that bolts up directly under the oil pan and serves no purpose other than to help lower drag is the one I'm talking about. It's found on the Sport models as part of the aero kit and may have been on the turbo's too.

KompressorLOgic

iTrader: (6)

i havnt seen this variation of the 2nd gen spoiler ever before ( this is one i bought a few yr ago)

if u notice the inner pedistals are alot wider then the regular s4 or s5 one.
( its abs and has the mazda logo on the bottom so i belive its stock, posibly from an 88?? iono)

RoTa7

because the style is the same, the s5 sits about 1/2 inch higher towards the back of the car

SpeedOfLife

iTrader: (16)

What I was saying is that if I can tell a difference by looking at them, then they don't look the same.

This thread has been informational, alas I probably won't be able to get a spoiler for a while, I need to be seriously focused on making the car reliable... BUT, hopefully you guys are enjoying the topic, too.

RoTa7

you cant even tell the difference thats y ur asking, all of the sudden u can tell the difference. pointless thread. u could have easily go to google and look for side pics of s4 and s5.