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Old 10-28-2011, 12:02 PM   #21
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I know they are a little expensive, But I was looking at a Aerocharger because they are made so if you want to go to the track and don't want any lag or if you are driving out to the track and don't want to be in boost all the time. All has to be done is to change a screw setting. Has anyone had experience with these turbochargers.
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Old 10-28-2011, 12:07 PM   #22
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Because for some reason people were under the impression it made full boost by 500RPM, which is never the case for another run of the mill centrifugal supercharger?

There's a reason the VF engineering kit failed.

Acutally, from teh dynos I've seen of the aerodyne turbos, they impress me little as well. Just size the turbo correctly and you compromise little.

here's one running low boost:



I think this was 5-6psi on a 1.6L

Compared to my $150 on wastegate attached to a very similar manifold:



red dashed lines.
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Old 10-28-2011, 12:53 PM   #23
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You never get off idle boost with a centri
I mean you get all the downsides of a sc with all the (supposedly) downsides of a turbo
no torque and not much topend.

only thing going for them is the ease of installation and relatively trouble free operation/dependability
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Old 10-28-2011, 01:11 PM   #24
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Quote:
Originally Posted by richyvrlimited View Post
Why's there no love for the Rotrex anymore? 12 months ago it was the new hotness.
I thought these numbers posted on a thread on miata.net were somewhat interesting. I think it might be the fact I’m running a 99 head with stock cams as part of the reason mine falls on its face on the top end but I’ll take the wallop of mid range torgue and power any day. The fact that the power drops before redline is better than a shift light for keeping you in the safe operating range while on the track. Lag? whats that?


TrackDayHooky – Rotrex system tweeked to the max
RPM Powa
5000 179
5500 221
6000 249
6500 286
7000 364
7500 420
Savington – Absurdflow 2871 1.9L
RPM Powa
5000 280
5500 300
6000 330
6500 340
7000 350
7500 340
bbundy – DIY 3071 with FM 2.0L
RPM Powa
5000 310
5500 325
6000 340
6500 356
7000 340
7500 300
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Old 10-28-2011, 01:47 PM   #25
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This is a friend of mine with a Nissan KA24DET and he's racing in NASA, which he has to stay under a certain power to weight ratio. So his boost on his GT2871R goes low rpm 12.5 psi to high rpm 6 psi, so his hp is as much as a flat line as possible. (thats one good thing about turbos)
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Old 10-28-2011, 01:47 PM   #26
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well, its safe to say it would be hard to stay in the that rotrex's power range on a 5-speed. I could see it being useful on a 6-speed though...with a 4.1 or something.
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Old 10-28-2011, 02:12 PM   #27
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Quote:
Originally Posted by Track View Post
well, its safe to say it would be hard to stay in the that rotrex's power range on a 5-speed. I could see it being useful on a 6-speed though...with a 4.1 or something.
With these power numbers you aint running a 5 speed unless mayby you got a Quaife gear set in it.

FWIW at Pacific Raceway I've hit 7100 rpm in 6th with a 3.636.

Bob
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Old 10-28-2011, 03:40 PM   #28
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Quote:
Originally Posted by richyvrlimited View Post
Why's there no love for the Rotrex anymore? 12 months ago it was the new hotness.
While I love my rotrex setup I have to admit a turbo would be better for area under the curve. With the narrow power band of a rotrex having close ratio 6 speed and 4.1 rear is essential. My car also has a skunk2 to help flatten the curve. Starting from scratch the turbo looks more appealing.

Using an AVCR boost controller on a turbo you could have your class HP available over the entire working RPM (redline to after shift rpm) of the motor. That's not going to happen with a SC. Average HP in the operating range is more important than peak HP.
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Old 10-28-2011, 03:41 PM   #29
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^ yea thats true also! I was not taking the power handling into consideration.

As a NA miata, the fastest I have ever gone is 115mph on the back/front straight of VIR. thats probably 5.5k-6k in 5th gear with a 4.3 rear end.

So any one of these options would a great addition!
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Old 10-28-2011, 04:57 PM   #30
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Quote:
Originally Posted by 1993ka24det View Post
This is a friend of mine with a Nissan KA24DET and he's racing in NASA, which he has to stay under a certain power to weight ratio. So his boost on his GT2871R goes low rpm 12.5 psi to high rpm 6 psi, so his hp is as much as a flat line as possible. (thats one good thing about turbos)
Interesting strategy. I have been wondering about that one myself recently. I presume he is racing in TTS or TTU?
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Old 10-28-2011, 09:06 PM   #31
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Yes he is racing TTS and he was in a Mag a few years ago but here are some video/pics


http://video.google.com/videoplay?do...arch&plindex=0






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Turbo vs Supercharger For Track-200261467-m.jpg   Turbo vs Supercharger For Track-200261990-m.jpg   Turbo vs Supercharger For Track-200262482-m.jpg   Turbo vs Supercharger For Track-dsc02658.jpg   Turbo vs Supercharger For Track-dsc02659.jpg  

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Old 10-28-2011, 10:31 PM   #32
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Very cool. Do you know what he is using for a boost controller?
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Old 10-29-2011, 02:34 AM   #33
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Quote:
Originally Posted by ZX-Tex View Post
Very cool. Do you know what he is using for a boost controller?
I asked but here is the rest of the info

http://www.ka-t.org/forums/viewtopic...er=asc&start=0
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Old 11-01-2011, 08:36 PM   #34
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That's Rob Symonds 240sx. He's a garrett turbo engineer. Cool guy.

He's running a high hp n/a motor now.
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Old 11-05-2011, 08:09 PM   #35
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Turbo charger being powered by a turbojet.
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