Ft86motorsports and Openflash Header 2

[steve99]

Originally Posted by SubieRumble

I don't have an intake, but I do have a K&N drop in filter.

drop in filter is fine

[Teseo]

Originally Posted by steve99

The ofh specific tune is very aggressive ignition timing wise and requires very good quality fuel to work well. If you don't have that fuel quality then you will be better just running the standard uel stage 2 tune.


There wont be much to be gained by an e-tune, unless you running non standard mods like intakes for example

Between ofh tune and jdl uel tune, they are similar or different in some way?

[steve99]

Originally Posted by Teseo

Between ofh tune and jdl uel tune, they are similar or different in some way?

If you download both tunes then compare in romraider you will see all the differences.


from memory


more base ignition timing
more aggressive IAT compensation
slightly revised VVT cam timings
slightly revised fueling

[steve99]

Originally Posted by SubieRumble

Okay. The outlet diameter of both headers is larger than my stock exhaust system. Will the extra turbulence make any difference performance wise? Would a larger overpipe(such as the one offered with the Gruppe-s) help negate any negative effects even though the overpipe is also a larger diameter?

the overpipe may be worth 1 or 2 hp.


The removal of the cat in header net most of the power gain (with tune). The length and diameter and design EL/UEL 4-2, 4-2-1 of the header primary tubes determines where the header will work best.


maybe have a read here http://www.ft86club.com/forums/showthread.php?t=81493


and the links below

[mdec]

Steve99 - I'm looking at the same OFT/OFH combo and was not aware that a more aggressive tune option was avail (although it makes sense). I'm assuming US 93 octane is good enough for this tune ...you also mentioned... "Start with the "standard" stage2 uel tune,, and check your afr and for knock" - can you be more specific ?..at the moment w/o any OFT tune I use a scan gauge to monitor Engine parameters & cannot see < AFR 12 during WOT thru the OB2..I'm assuming it's closer to 10.0 which should be rich enough..(?). Also by 'check for knock' are you meaning 'listen for knock' ?


thx.

[SubieRumble]

So The Gruppe-s is a bit closer to stock exhaust diameter so I'm definitely reconsidering it.

Adding on the Gruppe-s overpipe is only another $109CAD. I know that it's hp increase is minimal, but I'm wondering if I should get it anyway. (price for overpipe is $199 on it's own.)

Also there is an option for a oil pan heat shield for $40. Not sure if I need it, but $40 isn't that much. Any cons to the heat shield?

[SubieRumble]

Originally Posted by mdec

Steve99 - I'm looking at the same OFT/OFH combo and was not aware that a more aggressive tune option was avail (although it makes sense). I'm assuming US 93 octane is good enough for this tune ...you also mentioned... "Start with the "standard" stage2 uel tune,, and check your afr and for knock" - can you be more specific ?..at the moment w/o any OFT tune I use a scan gauge to monitor Engine parameters & cannot see < AFR 12 during WOT thru the OB2..I'm assuming it's closer to 10.0 which should be rich enough..(?). Also by 'check for knock' are you meaning 'listen for knock' ?


thx.

You can use the Openflash tablet to monitor knock in real time and also to save in data logs. I haven't done it yet, but I assume the best option is to log the knock settings and look them over on the computer after driving around in varied driving conditions; hard acceleration, almost lugging, and everything in between

[n0thing]

From what I've read, the aggressive OFH tune may cause problems and although I have access to 93&94, I'd rather have some margin of error in exchange for the minimal gain. I was in a similar situation during their BF sale so instead of getting OFH2/3, I got Gruppe-s UEL+OP+heatshield for less money. Paired with K&N drop in and catback, I have it flashed to the standard Stg2 UEL 93. When I get a chance, I will looking into datalogging and tweaking.

[SubieRumble]

Originally Posted by n0thing

From what I've read, the aggressive OFH tune may cause problems and although I have access to 93&94, I'd rather have some margin of error in exchange for the minimal gain. I was in a similar situation during their BF sale so instead of getting OFH2/3, I got Gruppe-s UEL+OP+heatshield for less money. Paired with K&N drop in and catback, I have it flashed to the standard Stg2 UEL 93. When I get a chance, I will looking into datalogging and tweaking.

When in the rev range does the engine start to pick up for you? Do you notice a dip at all?

[steve99]

Originally Posted by mdec

Steve99 - I'm looking at the same OFT/OFH combo and was not aware that a more aggressive tune option was avail (although it makes sense). I'm assuming US 93 octane is good enough for this tune ...you also mentioned... "Start with the "standard" stage2 uel tune,, and check your afr and for knock" - can you be more specific ?..at the moment w/o any OFT tune I use a scan gauge to monitor Engine parameters & cannot see < AFR 12 during WOT thru the OB2..I'm assuming it's closer to 10.0 which should be rich enough..(?). Also by 'check for knock' are you meaning 'listen for knock' ?


thx.

On the stock tune the 02 sensor only reads to 12.2 afr , the stock tune actually runs down to about 10.8 afr.


oft tunes rescale 02 sensor to read down to 11.2 and the oft petrol tunes run to about 11.8 afr so you can actually see whats happening.


You cannot see knock parameters with standard obd logging tools like torque.


oft or tactrix or ecutek logging tools allow you to see much more detailed parameters like knock.


you wont hear knock unless its extremely bad in most cases


more info see links below

[n0thing]

Originally Posted by SubieRumble

When in the rev range does the engine start to pick up for you? Do you notice a dip at all?

haven't really pushed the car due to the winter weather, but the dip is much less noticeable.

[SubieRumble]

Does anyone know the inside diameter of the Openflash header 2 on the overpipe end? My google-fu has failed me on this one...

[mdec]

steve99 - got it, thanks.


I'm coming from vintage 70's Japanese Car background where I did all my own tuning with a timing light & AFR with manual twin SU adjust...with Datsun I6 Engines 2-3 deg incr could make a huge difference & cause audible pinging..

[Mr.Impreza]

Originally Posted by SubieRumble

Adding on the Gruppe-s overpipe is only another $109CAD. I know that it's hp increase is minimal, but I'm wondering if I should get it anyway. (price for overpipe is $199 on it's own.)

I'd personally get the over-pipe. Might as well since your replacing the header.

Only time I see it's pointless to get a over-pipe is for someone like me who just has a catback/cat-less front pipe and no plans for a header