The torque dip is old news. Tune does nothing to fix it. All reasonable catless headers fix it, some catted headers (hi flow cats) fix it.

Even just punching out the insides of the OEM cat fixes it, dyno here:
http://www.ft86club.com/forums/showthread.php?t=96235

Except it says right at the top of that thread they are using an OFT OTS stage 2 tune plus other mods....what am I missing?

I had nothing but an OFT OTS stg1 tune on my 2017 car right when I got it and it all but eliminated the torque dip. So in my experience the tune very easily removes the torque dip by itself...

But this thread has already de-railed enough...

Dyno'd the car today, the hp/tq curve is more or less where it is supposed to be, the car feels much faster than stock, the numbers are wtf. :D I guess the real test will be the next track day.

I did not get a baseline dyno because I have an uncovered parking pad and needed enough time to install the header and tune the car and we have had a lot of rainy days lately so I was in a hurry to finish before March 10.

Head out to the LA meet tomorrow.

I'm not aware of the meet? More info if you don't mind would be appreciated.

Congrats you are the first person to remove the torque dip through tuning only :bow:

http://www.circuitmotorsports-blog.c...-fr-s-86s.html

I'm sorry Mike! Not trying to be a pain or a nuisance. Unfortunately it says the content is not available to see. What it seems like to me is because perhaps I'm not allowed to see the content from the group event page? Do I have to be accepted into the group to see the event or? Sorry again!

https://www.facebook.com/groups/losangeles86/

Join that first

Nice, that looks really good!

Umm, what? You claim that a tune does nothing to fix the torque dip. You then link two sources of data supposedly backing that claim, yet both of them include cars that are tuned :iono:

Myself, and others on this forum, have had tunes on stock cars where the torque dip was tuned out. I am not the only one...

All you are doing is spreading misinformation for people searching on this stuff...

Can't tell if trolling or not...

Good grief.

Ok so...

- a tune cannot get completely rid of the torque dip, but it can make it *much* better. The best stock tunes that handle the torque dip have a significant amount of cam overlap in that area, you hear a lot of valve noise. Some like it, some don't, Subaru may have had some limits in this area, not sure.

- a de-catted/gutted stock header cannot get completely rid of the torque dip, even with tune, look at that graph. There still is a dip - not to take away from it as a budget solution, there's huge bang for the buck there, but it's in no way comparable to the ACE bottom end or any of the other well designed long tube headers out there.

- a catted aftermarket long tube header of a good design, with a good tune *can* get rid of the torque dip

- IMHO, best combination obviously is a well tuned quality design long tube header plus an optimized tune (like the ACE setup). Save your pennies for this or a similar quality setup with a good tune, forget your front/midpipe for now, and get an axle back for sound. That's your best non-FI bang/buck other than E85 for this car.

Great comparison. Pretty good gains with the ACE, I think I'd go with that if/when I get an aftermarket header. I think it comes down to how much $$$ you want to pay, and if you care about getting the most performance or not.

Just following up on this. Zach and I did 2 sessions of additional dyno tuning and made even more power with the ACE A350 and Delicious tune. It's not significant, but goes to show how the dyno sessions (with a wideband) can help extract the most out of the setup. Also, after hitting 188/189 over and over and over again with the dyno pulls, we finally hit 190whp :D (corrected). As I always say, peak #'s don't mean all that much, but it was nice to finally see 190 lol.

Solid line is after dyno tuning, the dotted line is the dyno from OP street tuning results.

Some pretty solid torque gains down low with the additional tuning.