Tuning maf vs speed density
That's the problem. I don't know which is better or worse or easier or or or...
Im having tranny trouble 4l60E, tranny shop says it's not adjusting the line pressure thru the ecm and has burnt the tranny twice,they say the maf isn't working right. The tuner says its tuned thru SD and should work. SOOO, Im stuck in the middle with no 4th gear, OD.. Just wanting to know the difference between the two types of tuning. Why one over the other?
Rick
Im having tranny trouble 4l60E, tranny shop says it's not adjusting the line pressure thru the ecm and has burnt the tranny twice,they say the maf isn't working right. The tuner says its tuned thru SD and should work. SOOO, Im stuck in the middle with no 4th gear, OD.. Just wanting to know the difference between the two types of tuning. Why one over the other?
Rick
FormerVendor
Joined: Nov 2012
Posts: 390
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From: Dyno Tuning in KY
If its not setup properly running SD the Max line pressure will trip and cause excess pressure at all times. That's about the only thing other than just a crap tranny tune or wrong fuel constants and airflow calibration causing calculated torque to be off.
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True,
03 6.0l long block lq4 w/07 6.0l heads and an ls3 intake/injectors
nnick williams 92mm dbc throttle body
TR cam, .610 lift .223/.239 duration
headers.
05 trk 4l60e w/3200 revmax conv
ECM is a mistery 411
PSI harness
When I took it in to get tuned I just dropped it off, They never asked me what was in it or what was what.
Tranny shop said the tranny wasn't getting enough line pressure and burnt it up so theyve manually boosted the line pressure to 150 to keep it from doing it again. BUT I still dont have 4th/OD. and not to sure about 2nd. It definitly doesn't shift right...
I do need to say that they would get it back in and look at it again, so Im not bashing them,,Im in the process of getting it painted and have had alot of snow. Ive got parts off getting painted tonight infact. Just haven't had time to get it back up to them....
Thanks for all the input.
Rick
03 6.0l long block lq4 w/07 6.0l heads and an ls3 intake/injectors
nnick williams 92mm dbc throttle body
TR cam, .610 lift .223/.239 duration
headers.
05 trk 4l60e w/3200 revmax conv
ECM is a mistery 411
PSI harness
When I took it in to get tuned I just dropped it off, They never asked me what was in it or what was what.
Tranny shop said the tranny wasn't getting enough line pressure and burnt it up so theyve manually boosted the line pressure to 150 to keep it from doing it again. BUT I still dont have 4th/OD. and not to sure about 2nd. It definitly doesn't shift right...
I do need to say that they would get it back in and look at it again, so Im not bashing them,,Im in the process of getting it painted and have had alot of snow. Ive got parts off getting painted tonight infact. Just haven't had time to get it back up to them....
Thanks for all the input.
Rick
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Verdad Gallardo FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
^^^ Exactly right
The shops telling people that a SD tune will make more power are fools. It is ONLY true IF the MAF sensor itself is a restriction in the intake tract. With that said a LS3/7 MAF sensor and a $40 Spectre housing is pretty cheap compared to some of these "100mm MAF" sensors vendors sell and will support more HP than any hydraulic cam street engine will ever make.
The shops telling people that a SD tune will make more power are fools. It is ONLY true IF the MAF sensor itself is a restriction in the intake tract. With that said a LS3/7 MAF sensor and a $40 Spectre housing is pretty cheap compared to some of these "100mm MAF" sensors vendors sell and will support more HP than any hydraulic cam street engine will ever make.
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
As for my car now, it's a screwy setup to say the least. Due to being previously turbocharged, I'm running a 2-bar MAF with a HP-Tuners SD tune + "overkill" 60lb MotoTron injectors. I currently live in the Cali desert at 3K feet with 30 degree winters and 115 degree summers..... and regularly drive to the coast (sea-level + 70 degree temps). Even with these extremes, my SD tune is valid for the altitude/temp changes. I scan it periodically and have an AEM wideband to keep tabs on things.
Conclusion. MAF/SD. Doesn't matter. The end justifies the means. Proper tuning is key. With improper tuning....MAF is more forgiving.
Hope that helps.
