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Discussion Starter #1
Hi guys,

Might be a silly question but I'm now having almost a full build (e.g. rmm, DP, exhaust, suspension, etc.) under going but I need to move this July. So I probably don't have time to get a custom tune before moving and I don't want a plug tune for the car. My question is will that be safe to drive the car for over a thousand miles with all the bolts on without a tune? Downpipe is catted BTW.

Best and thank you!:eek::eek:
 

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Hi guys,

Might be a silly question but I'm now having almost a full build (e.g. rmm, DP, exhaust, suspension, etc.) under going but I need to move this July. So I probably don't have time to get a custom tune before moving and I don't want a plug tune for the car. My question is will that be safe to drive the car for over a thousand miles with all the bolts on without a tune? Downpipe is catted BTW.

Best and thank you!<img src="http://www.focusst.org/forum/images/smilies/redface.png" border="0" alt="" title="Embarrassment" class="inlineimg" /><img src="http://www.focusst.org/forum/images/smilies/redface.png" border="0" alt="" title="Embarrassment" class="inlineimg" />

Personally I wouldn't do it. better off with an OTS tune just don't drive it like a race car. I have all the standard stage 3 bolt ons. I reverted back to stock for emissions testing since I have a defouler installed. It ran like complete crap. I was getting getting negative corrections of almost -4. I'm still running the Cobb OTS tune (until I man up and get a custom tune). I run the stage 3 91 octane tune and fill with 93. I just recently started running stage 3 93 octane tune and filling with e30. Seems to run pretty good with very minimal negative corrections occasionally. And it saves at the pump.
 

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The previous owner of my ST an I ran a 200 cell catted downpipe for a total of over 4 years without any sort of tune and it was totally fine.
Still, your car will transform once you get it dialed up properly.
 

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Hi guys,

Might be a silly question but I'm now having almost a full build (e.g. rmm, DP, exhaust, suspension, etc.) under going but I need to move this July. So I probably don't have time to get a custom tune before moving and I don't want a plug tune for the car. My question is will that be safe to drive the car for over a thousand miles with all the bolts on without a tune? Downpipe is catted BTW.

Best and thank you!<img src="http://www.focusst.org/forum/images/smilies/redface.png" border="0" alt="" title="Embarrassment" class="inlineimg" /><img src="http://www.focusst.org/forum/images/smilies/redface.png" border="0" alt="" title="Embarrassment" class="inlineimg" />

Personally I wouldn't do it. better off with an OTS tune just don't drive it like a race car. I have all the standard stage 3 bolt ons. I reverted back to stock for emissions testing since I have a defouler installed. It ran like complete crap. I was getting getting negative corrections of almost -4. I'm still running the Cobb OTS tune (until I man up and get a custom tune). I run the stage 3 91 octane tune and fill with 93. I just recently started running stage 3 93 octane tune and filling with e30. Seems to run pretty good with very minimal negative corrections occasionally. And it saves at the pump.
It is not a good idea to be on a cobbs stage 3 93 octane tune and instead fill it as an e30. I dunno if you understand how tuning works for e30 but tuner has to add alot of fuel to compensate when running e30 because it's denser and your able to fit more fuel into a single combustion event so by running a 93 tune on e30, it's pumping fuel in at the rate thinking it's 93 so it's not compensating for the e30 your putting in. Now running a gallon or so of e85 in your tank of 93 "can" help protect against knock but running as e30 is not just a gallon your talking like 4 gallons of e85 if not more. I'm just telling you this to help prevent engine damage but your more then welcome to put straight alkyhol in your tank if you want. Also I remember reading your other posts and you've been running those OTS tunes for awhile now you may want to think of getting an pro etune, not a flash tune although even a flash tune with some revisions paid for would be better then the Cobb OTS. There is so much left on the table with those tunes in all aspects, power and safety. As much as people want to say that tune worked on those tunes for so long and they tested and tested and tested those tunes, it doesn't change the fact that they did all that testing on their UNO shop car, so in reality it's no different then getting an etune that was made for a focus with certain mods on and then putting it on another focus with basically the same mods on it, it's not the mods that make the difference it's the individuality of the cars performance and engine that makes the difference. Just saying. But I know your enjoying yourself so I can't argue with that.
 

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Personally I wouldn't do it. better off with an OTS tune just don't drive it like a race car. I have all the standard stage 3 bolt ons. I reverted back to stock for emissions testing since I have a defouler installed. It ran like complete crap. I was getting getting negative corrections of almost -4. I'm still running the Cobb OTS tune (until I man up and get a custom tune). I run the stage 3 91 octane tune and fill with 93. I just recently started running stage 3 93 octane tune and filling with e30. Seems to run pretty good with very minimal negative corrections occasionally. And it saves at the pump.
You cannot judge between tunes like that. The stage 0 or stock tune will have MASSIVE negative corrections for even the slightest hint of knock. This is on purpose, the ecu would rather sacrifice power to ensure that there is no knock. The knock strategy is different so you will see a lot more corrections, negative corrections alone are not an indicator of a poorly running engine. It’s when you see a sharp increase of negative corrections without changing anything that you should be concerned.

Also you had more variables than just a DP, you have a DP, intercooler, and intake. The general wisdom is that once you change the intake you need a tune as the MAF reading can be affected.


Op:
Logic dictates a DP shouldn’t affect anything, the upstream o2 sensor (read: before the cat) is what’s used to make fuel trim adjustments, the downstream sensor is only used for the emissions system. Regardless of what DP you have the upstream sensor should be unaffected. I run a low cell count catted 3” DP on the stock tune, and I’ve run it on stage zero with no problems.

Personally I would wait because the DP is the 2nd thing that effects performance, your first upgrade should be the intercooler.
 

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Personally I wouldn't do it. better off with an OTS tune just don't drive it like a race car. I have all the standard stage 3 bolt ons. I reverted back to stock for emissions testing since I have a defouler installed. It ran like complete crap. I was getting getting negative corrections of almost -4. I'm still running the Cobb OTS tune (until I man up and get a custom tune). I run the stage 3 91 octane tune and fill with 93. I just recently started running stage 3 93 octane tune and filling with e30. Seems to run pretty good with very minimal negative corrections occasionally. And it saves at the pump.
You’re running E30 and not tuned specifically for that fuel?


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I did not know this about the E30. I thought the higher ethanol content ran cooler and was more resistant to knock therefore leaving more power on the table allowing increase boost and timing (if tuned for it).I guess that's the whole reason why most get worse mileage with e30 just because you're burning more of it. I guess I'll stick with 93 and get to work on that getting that custom tune.I will say though with the higher ethanol content that's the best of car has ran.
 

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Discussion Starter #11
Thanks for all the replies! I'm now feel safer to put my car on the road with a stock tune. Will get a JST tune as soon as we settle down our new house and install a new intake pipe :D
P.S. The autoX rules don't allow intercooler modification until you go to street prepared category which is a very big disadvantage for the st.
 

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Thanks for all the replies! I'm now feel safer to put my car on the road with a stock tune. Will get a JST tune as soon as we settle down our new house and install a new intake pipe :D
P.S. The autoX rules don't allow intercooler modification until you go to street prepared category which is a very big disadvantage for the st.
Was wondering since it's been 5 months have you had any issues. I'm in the middle of installing cobb DP / Catback didn't really read up on this before I purchased. I don't want to spend more on a tune I just wanted a better sound I thought the DP would just allow little more flow. I guess I will keep the stock DP just in case I want to go back.
 
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