Rotofab Filter vs Green Filter 2382 hptuner log results

vince3 · 09-02-2025, 12:53 PM

I noticed that my Rotofab dry filter was a little dirty and was going to order a replacement filter, but the filters are now over $100. I took the rotofab filter out, cleaned and ordered the Green filter 2382, and logged them in HPtuners.

The rotofab recorded high MAF (SAE) and was around 1 lb/min higher across WOT pulls. The Green filter had a higher Volumetric Efficiency by 15-25 across the WOT pull.

Rotofab filter peak 54 lb/min, peak 3030 VE
Green Filter peak 53 lb/min peak, 3050 VE

Which do you think is better? I can post logs if it helps.

6spdhyperblue · 09-02-2025, 07:01 PM

Maybe the maf is reading differently with the way it flows over the element between the two filters.
The MAP is see things equally.

Not really sure

RobZL1 · 09-03-2025, 10:12 AM

A difference of 20VE and 1 lb/min is within the error range of repeatability in my opinion.

vince3 · 09-03-2025, 12:15 PM

I tested it again, back to back, one filter 1st, then let it cool and swap. Then, the following day, start with the opposite filter run, let it cool for 5 minutes, and rerun it. It's almost identical results. Rotofab=higher MAF by a little over 1lb/min, but lower VE by 15-25 across the pull and peak. KPA's are slightly higher with the green filter at higher RPMs (rotofab dips to 97.4 at 6600-6800rpm, green dips to 97.6 at 6600-6800rpm). I also try posting the logs, but .hpl is an invalid file. If someone knows how to post them, I can post if it helps.

RobZL1 · 09-03-2025, 12:21 PM

Then I'd say the Rotofab wins, but I still think you're talking 10hp or less.

KingLT1 · 09-03-2025, 04:16 PM

Just go run it on a dragy both ways.

vince3 · 09-03-2025, 04:16 PM

Sounds good. Swapping back to the rotofab dry filter.

Mountain · 09-08-2025, 05:24 PM

MAF vs VVE: I would go with MAF results. Why? VVE is the theoretical air your engine is using. VVE is dependent upon your tune, in how well the VVE is correlated to different pressure ratio points of the engine, taking into account cam angle and various other sensor inputs (i.e. "manifold temp" that is derived from the IAT). With MAF, even if your MAF isn't 100% dialed-in for your car, as long as you are comparing on the same MAF and MAF tune (i.e. same measuring device), you will be looking at the measured mas-rate of air coming into the engine. Also, like said, with results in single digits like that, you are within error of variables.

09-02-2025, 12:53 PM	#1
vince3 Drives: 2022 Vivid Orange LT1-M6 Join Date: Dec 2015 Location: Houston TX Posts: 433	Rotofab Filter vs Green Filter 2382 hptuner log results I noticed that my Rotofab dry filter was a little dirty and was going to order a replacement filter, but the filters are now over $100. I took the rotofab filter out, cleaned and ordered the Green filter 2382, and logged them in HPtuners. The rotofab recorded high MAF (SAE) and was around 1 lb/min higher across WOT pulls. The Green filter had a higher Volumetric Efficiency by 15-25 across the WOT pull. Rotofab filter peak 54 lb/min, peak 3030 VE Green Filter peak 53 lb/min peak, 3050 VE Which do you think is better? I can post logs if it helps. __________________ 2022 Vivid Orange M6 LT1 - 2" ARH headers with cats (full system), 3" ARH Pure Thunder mufflers, ported MSD intake, Soler 95mm tb, Rotofab CAI, E85 flex fuel, tuned by Jason@snackbartuning Old car 2016 M6 SS - MSD intake, Rotofab, 2" ARH headers with cats, E85 with EFI Tuning. Best ET: 11.7@122mph

09-02-2025, 07:01 PM	#2
6spdhyperblue Drives: 2SS 1LE Join Date: Aug 2013 Location: US Posts: 3,786	Maybe the maf is reading differently with the way it flows over the element between the two filters. The MAP is see things equally. Not really sure __________________

09-03-2025, 10:12 AM	#3
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,803	A difference of 20VE and 1 lb/min is within the error range of repeatability in my opinion. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13 Mods being installed- oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc.

09-03-2025, 12:15 PM	#4
vince3 Drives: 2022 Vivid Orange LT1-M6 Join Date: Dec 2015 Location: Houston TX Posts: 433	I tested it again, back to back, one filter 1st, then let it cool and swap. Then, the following day, start with the opposite filter run, let it cool for 5 minutes, and rerun it. It's almost identical results. Rotofab=higher MAF by a little over 1lb/min, but lower VE by 15-25 across the pull and peak. KPA's are slightly higher with the green filter at higher RPMs (rotofab dips to 97.4 at 6600-6800rpm, green dips to 97.6 at 6600-6800rpm). I also try posting the logs, but .hpl is an invalid file. If someone knows how to post them, I can post if it helps. __________________ 2022 Vivid Orange M6 LT1 - 2" ARH headers with cats (full system), 3" ARH Pure Thunder mufflers, ported MSD intake, Soler 95mm tb, Rotofab CAI, E85 flex fuel, tuned by Jason@snackbartuning Old car 2016 M6 SS - MSD intake, Rotofab, 2" ARH headers with cats, E85 with EFI Tuning. Best ET: 11.7@122mph

09-03-2025, 12:21 PM	#5
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,803	Then I'd say the Rotofab wins, but I still think you're talking 10hp or less. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13 Mods being installed- oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc.

09-03-2025, 04:16 PM	#6
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 7,559	Just go run it on a dragy both ways. __________________ 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel

09-08-2025, 05:24 PM	#8
Mountain Drives: 2017 SS 1LE, 2016 1SS (previous) Join Date: Apr 2016 Location: Metro-Detroit Posts: 1,869	MAF vs VVE: I would go with MAF results. Why? VVE is the theoretical air your engine is using. VVE is dependent upon your tune, in how well the VVE is correlated to different pressure ratio points of the engine, taking into account cam angle and various other sensor inputs (i.e. "manifold temp" that is derived from the IAT). With MAF, even if your MAF isn't 100% dialed-in for your car, as long as you are comparing on the same MAF and MAF tune (i.e. same measuring device), you will be looking at the measured mas-rate of air coming into the engine. Also, like said, with results in single digits like that, you are within error of variables.

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