See below
I don't, but if a couple of bolt-on modifications was enough to cause serious damage to a vehicle, then there would be a hell of alot more posts here from upset kids with blown engines.
There is a lot more blown engines then people post about , I avg 1.5 Focus engines a week through my shop as of Nov 1st , most people are not going to post bad new about blowing there engine and a lot of engines that run lean are not going to blow up but will shorten the life of the engine considerable as a second note to this why add mods that do any harm to an engine and not tune it to get all the potential out of said mods
He changed the intake so more air is going into the engine , the STFT will take care of that for the idle and cruise but what about the WOT , there is nothing to tell the WOT to add more fuel so now what happens ? yep it goes lean
He changed the header so more air is now getting out of the cylinder by scavenging this also leans out the engine , it isnt "couple of bolt-on modifications" like you stated its the mods them self that he did , if it had been a TB UDP I would agree but its the mods that were done not just that a couple mods wer done he should be fine
So the car is lean from the factory, and your answer is to lean them out even more?
Who said I was going to lean it out ? again please read what I said not what you want to read into it , I rarely lean out a tune file and most cases have to add fuel
Not at all, what I'm saying is that there is a 98% chance that his engine will be fine so long as it has been properly maintained. A custom tune will change that to 99%, which is technically an increase, but a nominal one.
98% chance the engine will be fine ? where do you get that from , how many Focus have you tuned , how many have you seen with the AF readings after modding with no tune , I have seen 1000`s and its more like 80% chance he will be fine , now whats fine mean ? that he doesnt blow up his engine , that it runs lean shortens the life of the engine but he makes it home ok , that is doesnt blow this time but 1.5 year later it blows but wouldnt of with a tune ????
I don't ride horses. Its just annoying that every single post you make is pushing a custom tune as if it is the end-all answer-all solution to every question on this forum.
Again I ask show me where I tried to sell ANYTHING in this post and never said anything about a CUSTOM TUNE those are your words , you cant because I didnt and rarely do , I may post that a tune will help but that doesnt mean buy a tune from me or that I am trying to sell one we both know a tune will help his car for safety and performance but you would never admit that now
It wouldnt hurt a thing to add a wide band air fuel gauge and see if his engine is safe , I dont sell air fuel gauges but its a good gauge to have on any modded engine and with his mods in my opinion he should have one and in the end thats all I said from the beginning
Tom