speed density vs maf tune
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Staging Lane
Joined: Apr 2010
Posts: 91
Likes: 1
speed density vs maf tune I have a stock bottom end ls1 with a d1 procharger. Wondering if i should do a speed density tune. The car has a stock maf right now. Its more of a street car to me with some strip passes. Just wondering if speed density is how i should have it tuned this spring.
I made 563 rwhp on a stock LS1 MAF on a turbo 5.3 engine. Car drives great. How is speed density so much better??
I'd say if your AFR is where it should be and the car drives good, keep it MAF. In the end, MAF will compensate for temp changes, speed density won't.
I'd say if your AFR is where it should be and the car drives good, keep it MAF. In the end, MAF will compensate for temp changes, speed density won't.
FormerVendor
Joined: Dec 2001
Posts: 2,444
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From: WWW.SPEEDINC.COM
Negative on that. There are a few hundred threads on the subject (search anyone??) so no need to post misinformation.
On a 4th gen it's very easy to max out the stock MAF sensor which means any additional boost/airflow and your PCM commands no more additional fuel.
Tune something SD however and you can run 0-30lbs of boost, change it on the fly and fueling remains perfect at every boost level. Yes, and even if the temperature changes.
On a 4th gen it's very easy to max out the stock MAF sensor which means any additional boost/airflow and your PCM commands no more additional fuel.
Tune something SD however and you can run 0-30lbs of boost, change it on the fly and fueling remains perfect at every boost level. Yes, and even if the temperature changes.
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Negative on that. There are a few hundred threads on the subject (search anyone??) so no need to post misinformation.
On a 4th gen it's very easy to max out the stock MAF sensor which means any additional boost/airflow and your PCM commands no more additional fuel.
Tune something SD however and you can run 0-30lbs of boost, change it on the fly and fueling remains perfect at every boost level. Yes, and even if the temperature changes.
On a 4th gen it's very easy to max out the stock MAF sensor which means any additional boost/airflow and your PCM commands no more additional fuel.
Tune something SD however and you can run 0-30lbs of boost, change it on the fly and fueling remains perfect at every boost level. Yes, and even if the temperature changes.
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Verdad Gallardo Negative on that. There are a few hundred threads on the subject (search anyone??) so no need to post misinformation.
On a 4th gen it's very easy to max out the stock MAF sensor which means any additional boost/airflow and your PCM commands no more additional fuel.
Tune something SD however and you can run 0-30lbs of boost, change it on the fly and fueling remains perfect at every boost level. Yes, and even if the temperature changes.
On a 4th gen it's very easy to max out the stock MAF sensor which means any additional boost/airflow and your PCM commands no more additional fuel.
Tune something SD however and you can run 0-30lbs of boost, change it on the fly and fueling remains perfect at every boost level. Yes, and even if the temperature changes.
Both work well, I'm not denying that, but I personally have always liked MAF tunes over speed density.
Can you ellaborate on this? Where in the ECU does it compensates for temp with a speed density only tune? Or does this require a custom OS? I've looked and only see the IAT vs. spark table. I havent seen any table that impacts commanded A/F based on outside air temp.
Okay, but if you have negative LTFT's before going WOT just cruising around, then you are not adding fuel during WOT. Or is the assumption that you will have positive LTFT's due to the denser air just cruising around, which will be added during WOT?
Now where does having a MAF help you in any way? Severe elevation changes can be one place where a MAF (assuming it can handle the flow you're throwing at it) can help you have a nice tight tune. The MAF also helps with understanding the change in flow based on humidity also. But I know plenty of Road Race guys using speed densitiy tunes and the difference in tune is negligible according to them from full rain to desert dry.
I've only heard of Harlan running a MAF that can handle big power (1000RWHP) but he had his own GM custom code in there since he worked for GM with some custom MAF's.