Running UEL untuned? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BRZach · 11-27-2015, 10:41 PM

Hello all,

I feel this has been somewhat talked about, (yes I searched), but I would like to get someones opinion who has credibility. I received a Gruppe-S header and am anxious to install it, for obvious reasons. Unfortunately I don't have money to tune it until I sell a few parts, and so I was wondering how harmful would it be to run the UEL without a tune for about a month or so? I wouldnt beat on it, rather just enjoy the new sounds since the AFR's wont be ideal. Then tune and have lots of fun when I can.

Anyway, I'm sure I'll get somewhat roasted, but hell, Im excited like anyone would be.

Thanks!

Teseo · 11-27-2015, 10:43 PM

Agreed, search

BRZach · 11-27-2015, 10:51 PM

Quote:

Originally Posted by Teseo

Agreed, search

Stated I have already. No one says you cant, Im asking will I be alright for about a month without tune and easy driving..

go_a_way1 · 11-27-2015, 10:56 PM

Quote:

Originally Posted by BRZach

Hello all,

I feel this has been somewhat talked about, (yes I searched), but I would like to get someones opinion who has credibility. I received a Gruppe-S header and am anxious to install it, for obvious reasons. Unfortunately I don't have money to tune it until I sell a few parts, and so I was wondering how harmful would it be to run the UEL without a tune for about a month or so? I wouldnt beat on it, rather just enjoy the new sounds since the AFR's wont be ideal. Then tune and have lots of fun when I can.

Anyway, I'm sure I'll get somewhat roasted, but hell, Im excited like anyone would be.

Thanks!

Only thing you will harm is the environment haha. Stock tune is safe but does run really rich and that may make it run even richer. I wouldn't worry about it you just may get a little black on your tail pipes. You won't see much performance gain until you tune though and will have a CEL.

azynneo · 11-27-2015, 10:56 PM

Quote:

Originally Posted by BRZach

Hello all,

I feel this has been somewhat talked about, (yes I searched), but I would like to get someones opinion who has credibility. I received a Gruppe-S header and am anxious to install it, for obvious reasons. Unfortunately I don't have money to tune it until I sell a few parts, and so I was wondering how harmful would it be to run the UEL without a tune for about a month or so? I wouldnt beat on it, rather just enjoy the new sounds since the AFR's wont be ideal. Then tune and have lots of fun when I can.

Anyway, I'm sure I'll get somewhat roasted, but hell, Im excited like anyone would be.

Thanks!

People say you should be fine, but your CEL might turn on

mrk1 · 11-27-2015, 10:59 PM

Will it run, yes. Is it the correct thing to do, no. Are you getting your money's worth from your header, no. Best off containing your excitement however long it takes to save up for a tune. Why not look after your car.

Rifle · 11-27-2015, 11:12 PM

One of the oldest FRS' out there, (first one in VA might I add), is at ~115k miles, 60k of them w/ an untuned UEL. Why? no idea but he's my buddy so I have to accept him lol.

No harm to do it. Won't get the 'performance' aspect of the header until it's tuned, however. And if you CEL comes on, say bye-bye to cruise control. Won't work until you clear the codes.

steve99 · 11-27-2015, 11:30 PM

It will be fine
Your only issue will likely be cel code P0420 comming on every few hundred miles (cat efficiency) and cruise control will be disable if that code ective just clear it with obd scaner of android torque app . You can reset cel code by removing battery terminal but that will reset ecu and you will likey notice the thrttle is a bit laggy till ecu relears a few parameters.

The headers wont upset afr unless you fitt them incorrectly and have air leaks.

Intake changes upset afr due maf sensor readings can be different.

Tune will disable p0420 cel code permanetly and optimise valve timing fueling and ignition timing for best performance.

solidONE · 11-27-2015, 11:32 PM

Spend that money on an OFT or equivalent before you get the header, is what I would do (what I did).

BRZach · 11-27-2015, 11:43 PM

Quote:

Originally Posted by solidONE

Spend that money on an OFT or equivalent before you get the header, is what I would do (what I did).

I have a custom tuner I plan to go to, once my extra parts sell. Header is here, therefore I cannot do that. Wanted to get everything first so I didnt have to retune/tweak for every new part.

In all, thanks to those who replied. I will most likely install them soon if I can find the time between studying and finals!
Appreciate it all!

Mods, I found my answer so thread can be closed.

Wayno · 11-28-2015, 07:35 PM

Then go to your tuner, pull the stock rom off, disable p0420 then reflash. Takes a whole 10 min.

Ultramaroon · 11-28-2015, 07:42 PM

Quote:

Originally Posted by BRZach

Mods, I found my answer so thread can be closed.

This is not a classified ad. Your question and the answers have now become part of the vast body of knowledge that is ft86club dot calm.

86Hiro · 11-28-2015, 08:39 PM

Which O2 sensor needs the eliminator plug? Mine has the CEL after I installed it

Ultramaroon · 11-28-2015, 09:03 PM

Quote:

Originally Posted by 86Hiro

Which O2 sensor needs the eliminator plug? Mine has the CEL after I installed it

Upstream is for closed-loop metering. ECU compares downstream conditions with upstream to determine cat efficiency.

11-27-2015, 10:41 PM	#1
BRZach SupaSter Join Date: Aug 2014 Drives: 13' BRZ Location: Florida Posts: 175 Thanks: 59 Thanked 21 Times in 20 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Running UEL untuned? Hello all, I feel this has been somewhat talked about, (yes I searched), but I would like to get someones opinion who has credibility. I received a Gruppe-S header and am anxious to install it, for obvious reasons. Unfortunately I don't have money to tune it until I sell a few parts, and so I was wondering how harmful would it be to run the UEL without a tune for about a month or so? I wouldnt beat on it, rather just enjoy the new sounds since the AFR's wont be ideal. Then tune and have lots of fun when I can. Anyway, I'm sure I'll get somewhat roasted, but hell, Im excited like anyone would be. Thanks! __________________ ----Build thread ---- --- Wheels for Sale ---

11-27-2015, 10:59 PM	#6
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 21 Post(s) Tagged: 2 Thread(s)	Will it run, yes. Is it the correct thing to do, no. Are you getting your money's worth from your header, no. Best off containing your excitement however long it takes to save up for a tune. Why not look after your car. __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

11-27-2015, 11:12 PM	#7
Rifle EX-86 Supercharged God Join Date: Aug 2015 Drives: '16 Series.HyperBlue BRZ Location: Philadelphia->Montana Posts: 766 Thanks: 220 Thanked 479 Times in 253 Posts Mentioned: 16 Post(s) Tagged: 1 Thread(s)	One of the oldest FRS' out there, (first one in VA might I add), is at ~115k miles, 60k of them w/ an untuned UEL. Why? no idea but he's my buddy so I have to accept him lol. No harm to do it. Won't get the 'performance' aspect of the header until it's tuned, however. And if you CEL comes on, say bye-bye to cruise control. Won't work until you clear the codes. __________________ Sprintex 210 Supercharged HyperBlue BRZ "HI MOM" 295WHP/220TQ

11-27-2015, 11:32 PM	#9
solidONE Senior Member Join Date: Dec 2012 Drives: FR-S Whiteout Location: California Posts: 2,863 Thanks: 1,808 Thanked 791 Times in 611 Posts Mentioned: 42 Post(s) Tagged: 0 Thread(s)	Spend that money on an OFT or equivalent before you get the header, is what I would do (what I did). __________________ Intent > Content cowardice is the mother of cruelty.

11-28-2015, 07:35 PM	#11
Wayno Senior Member Join Date: Apr 2014 Drives: Toyota 86 GTS Location: Australia Posts: 1,129 Thanks: 453 Thanked 896 Times in 424 Posts Mentioned: 211 Post(s) Tagged: 0 Thread(s)	Then go to your tuner, pull the stock rom off, disable p0420 then reflash. Takes a whole 10 min. __________________ rom downloads, information and examples Toyota 86 GTS OFT - Guide To Dialling In OTS Base Tune OFT - Example Alternate Maps for AT, 98RON, E85, MAF Scales

11-27-2015, 10:43 PM	#2
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,952 Thanks: 7,466 Thanked 2,980 Times in 1,802 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	Agreed, search

11-27-2015, 11:30 PM	#8
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,993 Times in 2,983 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	It will be fine Your only issue will likely be cel code P0420 comming on every few hundred miles (cat efficiency) and cruise control will be disable if that code ective just clear it with obd scaner of android torque app . You can reset cel code by removing battery terminal but that will reset ecu and you will likey notice the thrttle is a bit laggy till ecu relears a few parameters. The headers wont upset afr unless you fitt them incorrectly and have air leaks. Intake changes upset afr due maf sensor readings can be different. Tune will disable p0420 cel code permanetly and optimise valve timing fueling and ignition timing for best performance.

11-28-2015, 08:39 PM	#13
86Hiro Senior Member Join Date: Jul 2015 Drives: 2013 FR-S Location: Wauchula,FL Posts: 213 Thanks: 4 Thanked 43 Times in 35 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Which O2 sensor needs the eliminator plug? Mine has the CEL after I installed it

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