…I’m in the process of doing a “Volumetric Efficiency” tune…should get me throttle response, better mileage, aaand maybe a few more ponies.
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VE aka Volumetric Efficiency IS a Speed Density tune
[quote=“Carnut,post:19,topic:34623"”]
Now running a MAF generally makes for much better driveability any other time you are not in full throttle but that doesn’t mean that a speed density car cannot drive well.
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I wouldn’t say the drive ability part throttle with the MAF would be better than a MAP (SD) system. It all comes down to the tuner. Many are incompetent and unwilling to learn how to properly scale a VE table and idle airflow tables. It is 10x easier to scale a MAF table and then cover up the upper limits of the MAF table with the power enrichment table. There is a reason why every aftermarket hardcore EFI system is MAP based
i think you could also run twin smaller mafs that have a better resolution and average the voltage (a la skyline) this gives you better resolution, but added complexity.
Z MAFs are only good to about 500hp. But since we have dual throttle-bodies, Z owners can overcome this simply by doubling the airflow path and changing the values on the ECU.
At least on our cars, there isn’t a reason to switch to speed density. There are Zs with 1000+whp using stock MAFs.
Here you can see between the headlights, two ‘u’ shaped pipes. From the factory, the MAF would sit right in the middle where they come together. But here they split off under the bumper where 2 air filters are attached, but only one side has a MAF.
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wierd…
i never looked into it at all since i have no need for dual pop yet, but i was always under the impression you run two MAF’s just spliced together in some way…and now i see it’s just one MAF but twice the intake surface area…good to know :tup:
I wouldn’t say the drive ability part throttle with the MAF would be better than a MAP (SD) system. It all comes down to the tuner. Many are incompetent and unwilling to learn how to properly scale a VE table and idle airflow tables. It is 10x easier to scale a MAF table and then cover up the upper limits of the MAF table with the power enrichment table. There is a reason why every aftermarket hardcore EFI system is MAP based
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which is why I said this.
[quote=“Carnut,post:19,topic:34623"”]
Now running a MAF generally makes for much better driveability any other time you are not in full throttle but that doesn’t mean that a speed density car cannot drive well.
The only difference between OEM and aftermarket when it comes to tuning is that the OEMs have invested 10’s of thousands of man hours developing calibrations for their fuel systems where you are paying someone 4 maybe 5 hours depending on the complexity…you get what you pay for. If you are running a standalone it certainly will not be perfect like the OEM to start in -40 or +140, or drive with near perfect A/F ratios at each and every load point and possible weather condition everytime. You just can’t do it all in 5 hours etc. You will have to invest a serious chunk of change for the time to dial in YOUR setup as they are all different and importing someone elses settings will still not get you perfect.
… i never looked into it at all since i have no need for dual pop yet, but i was always under the impression you run two MAF’s just spliced together in some way…and now i see it’s just one MAF but twice the intake surface area…good to know :tup:
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Some people do run 2 MAFs for greater accuracy as Newman described above, but for 99% of Z drivers, 1 MAF works just fine.
