Ideas for hood scoop

[astraelraen]

Anyone with enough body shop knowledge/experience to know how much trying to get a custom hood/duct/scoop fitted on to the hood would cost?

They've been doing some work on the after-intercooler air temp sensor for the dashhawk and so far the temperatures look really bad, even with the ETS top mount.

I doubt a viable front-mount is coming out anytime soon for the CX7, and even if it was it would be pricey and out of the question for me as long as I wanted a warranty because I know my dealer would freak out about that.

So if a front mounted intercooler is out, then some sort of hood scoop ala Subaru would be awesome.

I haven't done any research, so I don't even know if its feasible to simply cut the hood and add a scoop or if there is any way to make it look good.

Just fishing for ideas.

[Raider]

I am so with you on this. I talked to a body shop. $500 in labor alone to graft in a subaru scoop, rough estimate.Our hoods curve different I bet, so I would expect fabbing to need to be done. Then paint. Of course, the cost of the scoop and any extra ductwork.

I can see getting a junkyard hood from a cx-7 to use as the basis. Then get a Subby scoop. A sawz all, Bondo, Duct tape, and JB Weld it on to fit. Then make a fiberglass mold, and reproduce in mass.

IT is a lot of work. But the big issue we have, is the TMIC is not centered.
http://s93052172.onlinehome.us/pictures/Mazda%20Section/IMG_1426.jpg

So we would need to make it really wide...

[astraelraen]

I figured it would be in the 500-1000 range for labor and everything. Which is sad, because I'm sure I could find a shop around here that could bend the pipes, etc for a FMIC for less than 1000 if I was adventuresome enough to do that. But as I said above, my dealer would freak out if I needed any warranty work done.

While I believe the scaling, etc is still being tweaked and I haven't messed with it in a week or so, last I checked under ambient temps of even as low as 20-35F the after-intercooler temp is all the way up in the 130F range, even with the ETS topmount. Thats just around town, no WOT driving too.

[MAZOOM]

The subbie scoop on the Legacy would look good, the one on the forester would look a bit ridiculous.

[JRB]

i agree with the legacy scoop. wider. i know i'd buy one if you guys mass prod it...

[MAZOOM]

http://i99.photobucket.com/albums/l289/mikomisan/rexercx7_modded_scoop.jpgPhotoshopped hood scoop from an older thread, the scoop is from the MS6 SU Carbon Fiber hood.

[astraelraen]

I think that looks like crap on the MS6, but your photoshopped picture is nice imo. It bulges too much for me on the MS6, whereas it is blended very well in that photoshopped pic.

[MAZOOM]

That's Mikomi's work, and yeah I agree with the bulging thing, I don't want it all brash looking, it wouldn't/doesn't match the CX-7's lines, something super subtle would be perfect.

[rmvazquez]

I think even with a hood scoop we will still have problems of heatsoaking so yeah that wont fix all our problems :(

[SteveA]

Well, heat soaking by definition should not be a problem if you are moving.

[astraelraen]

I think the TMIC will have a somewhat of a problem all the time since it sits on top of the engine. But with a hood scoop it should perform a lot better than it does currently.

The current duct system works fine for everyday driving, but its cooling ability is severely limited. That combined with the temps that the sensors seem to be showing makes cooling for performance difficult, even with the ETS TMIC.

Just for numbers: (Keep in mind, the these numbers are probably off somewhat. But it still gives you an idea, especially of the scaling/cooling ability. I'm going to do some more tests this afternoon/this weekend with the updated software) I do have an ETS TMIC.

With an outside ambient of 30F and my garage at ~50/60F. I would start my car in the morning and the boost temperature would read 130F. This is under light driving in 30F air for 5-10 minutes to work. It would not drop below 130F.

In terms of what I would consider normal short distance driving; starting my car outside work, driving 5-10 minutes home and 1 or 2 spirited starts from a stop sign, parked in a garage and repeated 40 minutes later. In 30-40F ambient air the boost temperature would peak at about 180F. After lunch I would get in my car and right off the bat, ~40 minutes later the boost temp would start out at roughly 165-170F. But after heavy driving from before + the drive back to work, it would take it nearly the whole 5-10 minutes to even start to cool down. By the time I got to work the boost temps had reached 140-150F.

In the simplest sense, it seems that the TMIC gains a minimum of 100F just by sitting on top of the engine without "large" source of air passing through it.

If we're reading these temps in 30F ambient winter air, what do the temps look like in 90-100F summer air? :eek:

Anyway, long story short. We need a scoop, or a FMIC. But we already knew that.

[mikomi]

Mazda CX-7 WRX STI GT AWD! Did i miss out any 2-3 letter tags? Anyway, here's a new photoshop.

I plucked the scoop from a scooby.

http://i99.photobucket.com/albums/l289/mikomisan/CX-7/cx7_scoobie.jpg

[Superstretch18]

Anyone think that rain in any hood scoop might be a problem with our engine? The spark plugs are directly beneath the intercooler and there is a nice little channel there for water to pool up. Thoughts?

[MAZOOM]

The current scoop doesn't have any problems.

Even then we could put a metal plate beneath or something.

[StrokerZ]

here in Panama, the AMB temp is 30-32 C at noon, with heavy traffic i see the IAT rising up to 70 C, also I have noticed for cooling effect to keep moving at least 30-40 mph, the engine bay temp helps to rise the TMIC temp, so a hood scoop will not helps to cool the IC, something away from the engine bay like FMIC will helps a lot to keep the IAT cool.

regards

[rmvazquez]

Right now we have no heatsoak while moving. So the problem still persists that when the car sits for too long it doesnt work as well.

[astraelraen]

Ambient is roughly 40F outside. AAT/IAT/Boost temp are all scaled to the numbers on the right.

Boost Air temp from Garage to 1/2 way to work:
http://i60.photobucket.com/albums/h23/astraelraen/cx-7/BATtowork.jpg

Boost Air temp from 1/2 way to there. http://i60.photobucket.com/albums/h23/astraelraen/cx-7/BATtowork2.jpg

I don't know where the AAT temp sensor is, but the IAT temp sensor is on your MAF housing in your air intake.

As you can see they are pretty much identical and on at least a cooler day, IAT generally isn't that much higher than the real ambient temp. This is with the stock airbox btw.

As for boost air temps, acceleration obviously helps. Cruising at 30-40mph is not enough speed to keep the boost air temps down. The boost air temp was roughly 115-135 cruisng at 30-40mph. Thats 75-95F above ambient temp.

[Online Aussie]

Here in Australia we call it the Holden Monaro. In the US, I think it's named the Pontiac GTO? No matter what it's name is, the twin nostril scoops on the bonnet would look unbelievable on the CX-7 and within 6 months I'll have proof! It'll be on mine. It's low profile (not as obvious and protuding like the wrx) as well as the fact that each nostril is off centre, makes it a perfect candidate for that TMIC!

I have another thread with pics of the progress on my car so far.

[MAZOOM]

^ Awesome!

[Raider]

Yeah, I know of the GTO in the USA. Nice car! Cannot wait to see it!


Here in Australia we call it the Holden Monaro. In the US, I think it's named the Pontiac GTO? No matter what it's name is, the twin nostril scoops on the bonnet would look unbelievable on the CX-7 and within 6 months I'll have proof! It'll be on mine. It's low profile (not as obvious and protuding like the wrx) as well as the fact that each nostril is off centre, makes it a perfect candidate for that TMIC!

I have another thread with pics of the progress on my car so far.

[BLKCX-7]

I really like the subaru Liberty STI hood scoop.

It would look sweet on the cx7.

It looks stylish and not like the wrx shark fin hood scoop.

[Raider]

that is a nicer one.

[rmvazquez]

Never heard of a subaru liberty

[BLKCX-7]

Never heard of a subaru liberty

It's called Subaru Legacy in the US.... Sorry