cobb speed density

Old Jan 16, 2012 | 12:25 PM
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cobb speed density

Finally can talk about this.
COBB just went public with their great speed density set for Subaru. Its a great low cost set up. And now we Subaru owners don't need to go expensive aftermarket ecu.

COBB Tuning Blog » COBB AccessTUNER Supports Speed Density on 2.5L Turbocharged Subaru Vehicles
Old Jan 16, 2012 | 01:31 PM
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Sounds like the biggest benefits for this is post-stage-3?

Originally Posted by old.guy
Finally can talk about this.
COBB just went public with their great speed density set for Subaru. Its a great low cost set up. And now we Subaru owners don't need to go expensive aftermarket ecu.

COBB Tuning Blog » COBB AccessTUNER Supports Speed Density on 2.5L Turbocharged Subaru Vehicles
Old Jan 16, 2012 | 01:37 PM
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I think its more on turbo and fuel.
Old Jan 16, 2012 | 03:32 PM
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For the record, I'm not a huge fan of Speed Density systems in street cars.
GM switched over to Speed Density in the early 90's and quickly switched back to MAF based systems.
Instead of using a MAF to measure airflow in real time SD uses uses the MAP sensor and a predrawn table of values to determine A/F and timing curves.
It's ok for wide open throttle situations, but for daily driving MAF systems are more adaptable.

Yeah, a MAF sensor can be a restriction, but if the 600+HP ZR1 can run one (albeit a larger one), so can we.
Old Jan 16, 2012 | 04:12 PM
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Been waiting for this
Old Jan 16, 2012 | 04:53 PM
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Originally Posted by Lowend
For the record, I'm not a huge fan of Speed Density systems in street cars.
GM switched over to Speed Density in the early 90's and quickly switched back to MAF based systems.
Instead of using a MAF to measure airflow in real time SD uses uses the MAP sensor and a predrawn table of values to determine A/F and timing curves.
It's ok for wide open throttle situations, but for daily driving MAF systems are more adaptable.

Yeah, a MAF sensor can be a restriction, but if the 600+HP ZR1 can run one (albeit a larger one), so can we.
GM and 90's. Lol. Just saying. ECUs have come along way since then. I know 1st hand it works and its a great upgrade for big Turbo and I think e85 guys.

Last edited by old.guy; Jan 16, 2012 at 05:27 PM.
Old Jan 16, 2012 | 07:44 PM
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I've been playing around with their beta for a while now. It's the best speed density implementation I've ever seen. What most people don't realize is that most standalone ECU's out there are not try speed density systems.

-- Ed
Old Jan 16, 2012 | 07:59 PM
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Originally Posted by Lowend
For the record, I'm not a huge fan of Speed Density systems in street cars.
GM switched over to Speed Density in the early 90's and quickly switched back to MAF based systems.
Instead of using a MAF to measure airflow in real time SD uses uses the MAP sensor and a predrawn table of values to determine A/F and timing curves.
It's ok for wide open throttle situations, but for daily driving MAF systems are more adaptable.

Yeah, a MAF sensor can be a restriction, but if the 600+HP ZR1 can run one (albeit a larger one), so can we.
You didn't read anything about Cobb's SD did you? They also have a way of using both MAF (I'm guessing at low loads) and then swithching to SD (I'm guessing durring high loads). GM didn't do that in the 90's.
Old Jan 16, 2012 | 08:36 PM
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Exactly. They developed a hybrid system that can use MAF for closed loop, MAP for open loop, or both.
Old Jan 16, 2012 | 11:50 PM
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now the question is do the guys like myself who arent currently tuned on a AP,should we give some thought to going that route now?
Old Jan 17, 2012 | 08:47 AM
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That's how most fuel injection systems work
Old Jan 17, 2012 | 09:21 AM
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Originally Posted by Lowend
That's how most fuel injection systems work
You're thinking of the O2 sensor. The MAF is always used for airflow measurement in a MAF based system.

-- Ed
Old Jan 17, 2012 | 10:39 AM
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My real expertise is with american cars (Corvettes)... they use the MAF for everything but WOT than use the MAP to do set table values for A/F
Old Jan 17, 2012 | 11:47 AM
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I've been tuning C5 and C6 corvettes for a little while now. Normally they do use the MAF at WOT. They also have SD options, however, for bigger FI setups.

-- Ed
Old Jan 17, 2012 | 12:10 PM
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Is this something that those who are at a stage 2 or 2.5 or 3 (whatever stage someone wants to call when doing a TBE, Header, Uppipe, CAI (not a short ram), Turbo inlet. The "bolt-ons") will benefit from?

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