Pacembellum

carlsonjw

Interested in this filter.

jbsblownc5

Good stuff Terry, You and I really need to play around just a bit on the dyno sometime!!

0Terry@BMS

If you ever need any tuning help with yours no problem. I've had mine out at the last 4 1/2 mile races and I normally log the runs and make minor tweaks if I see anything out of place. The best way to get in to understanding your tuning is to learn how to datalog and evaluate that data. With this platform its all super easy and straightforward.

jbsblownc5

VERY Cool Terry, I have HP tuners on my laptop, and have already purchased the extra credits when we did the tuning at Westech...

Looks like I'm going to put another tune on my car for Torco 99 Oxygenated fuel, running Meth as well..

Maybe use that one on the road course sometimes, and Half/standing mile stuff...

0Terry@BMS

What I did with my tuning that seems counter intuitive but helped actual performance was dropping midrange timing to reduce torque and improve traction.

jbsblownc5

Once I get a little heat in my Toyo 345 R888s, they really do bite pretty good!

Al3x_666

Terry do you when your filter will be available for purchase?

I have canceled my halltech...

0Terry@BMS

Hoping to have a batch in a week or so.

phantasms

Sweet!!!

Can you please explain in a little more detail why the filter alone can possibly mess with it enough to require a tune? I was under the impression the issue with the CAI was the incorrect size and flow around the mass airflow unit. If you're leaving the stock intake why does more flow through the filter potentially push the limit? I would have figured the stock tune could handle more air with all other things being equal. Lastly, would one of those aftermarket was air flow sensors help in this situation or are those things nonsensical in this application?

Thanks!

Best,
Gene

dbaker

I would be interested in the filter for my '17 Z51.

\db2

Getyup

Count me in for one as well👍

0Terry@BMS

It turns out the primary driving factor with the aftermarket intake MAF scaling isn't the MAF housing itself, but the fact that it remains so oversized relative to flow requirements for our power levels.

The factory filter by design diverts slightly more airflow in the center of the MAF housing than the perimeter, but doing this introduces a restriction.

When adding an intake with a huge filter you get slightly more airflow along the perimeter and slightly less in the center, due to the nature of how the filters are configured to reduce restriction, and this minor variation is enough to effect the sensor reading 8-15%. On the low end of that scale you get a leaner AFR, bit more timing, and of course more boost from the restriction reduction, and can get away with the stock tuning which is a little too rich anyway. On the high end you wind up too lean and need to change the MAF scaling in the tune to compensate.

In removing the restrictions within the factory filter we've fallen in to the same boat. What I don't fully know yet is where along the scale we'll fall. We could make an electronic device that sits between the MAF senor and DME to allow some tuning for those who don't want to tune. But HP tuners is so widely used and inexpensive it would be hard to justify development costs.

C7/Z06 Man

Terry, I noted that 8-15% in your last post, closer to 8% maybe good, closer to 15% maybe not so good.

Then I went to your first post and after looking at all the percent's it looks like the AFE with its slightly smaller air tube diameter (by my own rough measurement) and using the "low flow" gray filter looks like a better match for performance by not getting to lean to cause retard/reduced performance where as the 15% side maybe a problem. AFE may have done their home work.

Note: your setup has a pulley, etc. and the AFE and your stock replacement filter made approx. the same power so on a stocker the AFE may be a better fit and less likely to set a code from what I'm seeing here.

Taimur

I'd be definitely interested as long it doesn't require tuning on my '17 Z.

0Terry@BMS

In dyno tuning each to get proper MAF calibration the AFE w/ dry filter and this drop in wound up with the same basic MAF correction factor. Since the AFE works OK with the stock tuning "most of the time", I am hopeful our drop in will also, but it's not guaranteed at this point. And we all know several cars have problems with the AFE and Haltech intakes so that likely will be the same case with this drop in. We'll have to see.

Worst case if nothing else if you are planning to tune anyway no reason to spend $500 for an poor fitting intake that does the same thing as a $100 filter replacement.

Z0Sick6

So whatever your test filter was from X brand... I imagine that is safer for those with no tune if yours requires it, or if "most of the time" if people don't want to take the chance, chances are the one that flows a little less would be "safer". Would that be right?

0Terry@BMS

There was a strange anomaly in the testing though... While brand X flowed better than stock on the flow bench, it did not produce more HP than stock on the dyno. On my to-do list is to figure out why before I share that data.

I don't believe a typical drop will hurt anything as long as its a dry filter. But unless you happen to need a new filter I don't believe it's an upgrade either, or at least have not yet been able to prove it is.

Z0Sick6

not sure what filter or if it was dry or oiled. But the lightly oiled green filter showed an 11 whp gain on a 17z. He had borla x pipe and ported tb. Dynod after each mod and the filter added 11rwp.

0Terry@BMS

Link to that dyno testing and data? I've found normally when people post results like that they fail to include a log of boost & AFR with them. If you are not watching everything carefully you could easily have a 10-15hp variance between runs especially on the stock tuning which is very temperature dependent.