Ok so everybody says " get all your parts on before you go get a custom tune"

what exactly would be different with say a straight through 3 inch exhaust vs a stock exhaust when you go to tune it?

I mean are you able to pull more timing out of it without knock?

Can somebody explain what EXACTLY would be changed via ecu flash

for say a car with intake piping and an exhaust

vs a stock car? would you be able to push more timing? run leaner AFR? without it detonating?

The only thing i can think of is for example a bigger intercooler would make the charge air slightly colder therefor letting you get away with a pinch more timing advance? What about exhaust? or are there other factors to it and if so what are they?

 

Hi

Well I think what people are saying, is get your mods on, so you don't have to pay to have the tune done twice.

The stock exhaust is the most restrictive part on an Evo, with a 3" TBE you will achive higher boost than you can on stock item. When you tune the WOT area on your fuel and ignition maps, you'll be tuning different load cell for differnt boost level. If you flash with the stock exhaust, then switch to a 3" you'll need to get another flash to optimise performance.

No you can't say exactly what would be changed with a flash, as a general guide the very upper areas of the fuel map are leaned a little. Ignition could be advanced or retarded depending on, boost, fuel, car application etc.

As to changing the inlet, the stock setup is very good,I'd advise to spend the cash on a TBE exaust and logging equipment.

MB

 

Would be nice to have a thread about the changes needed with typical bolt ons for us tuning newbs...

ie. if you add a HFC over the stock cat this or that will happen and you'll need to blah blah blah...

 

well i self tune my car, and as far as an exhaust letting you hit higher boost levels, or so to say *load points*. I can see why you would need to retune because you would be hitting a higher load. Dont know how much higher you actually get to, but if thats the case then there is no real difference when self tuning. you just tune for your peak load points and so on.

 

anything that changes the V.E. of the engine can affect AFR's and the ideal timing curve, this includes cam gear changes, intakes, exhaust, etc etc.

I have seen nearly identically setup cars report totaly different load numbers. Infact, the car making the least power after tuning was reporting the higher loads, on average 20 to 30 load units higher.