82 mm throttle body

[itsnotanova]

Originally Posted by ike84

Instead of raising the trunk lid you could just cut a giant hole in it and mount a scoop over the hole. Kinda the poor man's version of your pic earlier. The aero images of our cars that I have seen show that to be a relatively low pressure area but I'm sure it can't hurt.

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This "computer generated" aerodynamic picture somewhat shows what I'm talking about. That one line that starts on the hood and flows along the top of the door is close to what I see water spots do on my street boxster after driving in the rain. On my car it takes a sharper turn after the B pillar and flows right above the front corner of the trunk.

[ike84]

Originally Posted by itsnotanova

This "computer generated" aerodynamic picture somewhat shows what I'm talking about. That one line that starts on the hood and flows along the top of the door is close to what I see water spots do on my street boxster after driving in the rain. On my car it takes a sharper turn after the B pillar and flows right above the front corner of the trunk.

That's been my experience too. I actually dont mind driving with my top down in light rain so long as I'm above 35 mph because the aerodynamics keep the cockpit dry lol.

I wonder if it would work well to put a louvered panel or scoop along the top edge of the quarter panel to catch that line along the side. It shouldn't be difficult to route that air into the trunk and based on your racing pic it would probably be pretty clean and slightly pressurized at speed.

One thing I'm getting ready to do is to add a gt style spoiler (purely for look, guilty). With that in place though I think I will remove the stock spoiler assembly and cover that opening with a gutter guard that has a diamond mesh pattern. There won't be any ram air effect, just one more way for the trunk to "breathe" as I continue to add more stuff back there.

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[itsnotanova]

If I stay with the M96 motor, then I was going to use this scoop. By what I could tell from a rough measurement it should fit without too much modification to the roof. I believe it would fit through the rear window and the intake would be just above the top of the roof. About right where the red line turns to blue in the aero pic

[ike84]

Originally Posted by itsnotanova

If I stay with the M96 motor, then I was going to use this scoop. By what I could tell from a rough measurement it should fit without too much modification to the roof. I believe it would fit through the rear window and the intake would be just above the top of the roof. About right where the red line turns to blue in the aero pic

That should do it. I would definitely try to get the horizontal aspect of that as far forward on the roof and possible so that it's not right at the break line where air separates from the roof line. It may be worth it to place some vortex generators in front of it too to keep as much air in their line as possible. How are you gonna duct the air into the inlet from that point though? Are you gonna plumb it to the TB or just use it as a breather for your filters?

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[itsnotanova]

Originally Posted by ike84

That should do it. I would definitely try to get the horizontal aspect of that as far forward on the roof and possible so that it's not right at the break line where air separates from the roof line. It may be worth it to place some vortex generators in front of it too to keep as much air in their line as possible. How are you gonna duct the air into the inlet from that point though? Are you gonna plumb it to the TB or just use it as a breather for your filters?

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I was going to turn the intake tube with the TB as far forward as possible. I'm hoping the air filter will fit within the area after the neck.

[ike84]

Originally Posted by itsnotanova

I was going to turn the intake tube with the TB as far forward as possible. I'm hoping the air filter will fit within the area after the neck.

That would be sweet, just plastiweld it to the top of the engine cover and route everything up. If it's the right size and shape that will be a hell of an end result! It will be tricky to get it through the back window though, maybe cut it in two, pass it through the window, and then plastiweld back together? Or just fab up a 2 piece window that assembles around it.

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[ike84]

Originally Posted by itsnotanova

I was going to turn the intake tube with the TB as far forward as possible. I'm hoping the air filter will fit within the area after the neck.

Hey woody, question for ya. I've been running now for a few hundred miles on this setup with 996 tune and big exhaust and I noticed that the car now likes to move! More specifically, around 4200 rpm at WOT she pushes me back in the seat, which I don't ever remember happening before. Weirdly though, it doesn't happen every time I pass 4200rom at wot. I can't quite pinpoint what is contributing to this happening (or not happening). I'm wondering if maybe the DME is still figuring stuff out.

I know most of your driving is dirt track, but I'm curious about what your experience has been so far? Big gains at high rpm? Are gains always there?

Btw, how's the shop build going?

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[itsnotanova]

Every m96 I've driven seems to come alive between 3500-4500 and falls flat after 6000. There does seem to be a bigger jump in power at the 4000 mark with my 996 intake 2.7 rally car than with my 3.4 street car. I don't think it takes that long for the computer to learn and adjust. I have to disconnect the battery on my rally car at the end of the day. Every time I reconnect the battery, the car idles weird for about five minutes but seems to run fine after that. I don't know why you're feeling a jump sometimes and not the other. Aging fuel pump?

The building is going up pretty good for an old man working by himself. I start on installing the sheet metal tomorrow.

[blue62]

Originally Posted by ike84

Hey woody, question for ya. I've been running now for a few hundred miles on this setup with 996 tune and big exhaust and I noticed that the car now likes to move! More specifically, around 4200 rpm at WOT she pushes me back in the seat, which I don't ever remember happening before. Weirdly though, it doesn't happen every time I pass 4200rom at wot. I can't quite pinpoint what is contributing to this happening (or not happening). I'm wondering if maybe the DME is still figuring stuff out.

I know most of your driving is dirt track, but I'm curious about what your experience has been so far? Big gains at high rpm? Are gains always there?

Btw, how's the shop build going?

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Ike
I have experienced the same as you in regards to the torque curve around 4200 RPM under WOT or near WOT.
Every now and then it is like there is a little more power.
My car is a 2000S completely stock.
I thought that perhaps my MAF was going bad.
Or that my resonance flapper was hanging up.
But everything checks out ok.
The car runs great.
The only thing I could come up with is:
I can only get 91 Octane fuel.
So my thought is that the DME/ECU is holding back ignition timing to prevent pre-det or knock.
I think when I feel the little bit of extra power is when the ECU/DME is allowing a little more ignition advance.
Keeping my eyes open for some higher octane fuel to test my theory.
Thoughts????