cobb speed density

Old 01-16-2012, 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
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Old 01-16-2012, 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
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Old 01-16-2012, 01:37 PM
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I think its more on turbo and fuel.
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Old 01-16-2012, 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.
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Old 01-16-2012, 04:12 PM
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Been waiting for this
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Old 01-16-2012, 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; 01-16-2012 at 05:27 PM.
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Old 01-16-2012, 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.

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Old 01-16-2012, 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.
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Old 01-16-2012, 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.
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Old 01-16-2012, 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?
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Old 01-17-2012, 08:47 AM
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That's how most fuel injection systems work
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Old 01-17-2012, 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.

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Old 01-17-2012, 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
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Old 01-17-2012, 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.

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Old 01-17-2012, 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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