Normally Aspirated?? why tune?

m4a1mustang · 02-17-2012, 09:30 AM

Quote:

Originally Posted by BigT

The OP is right to a certain extent. Tuning a Z is with bolt-ons only yeilds very minor increases in power and driveability. Meanwhile, tuning a car with forced induction or more cylinders usually yeilds substantial increases. For example, Evo X's gain nearly 60 whp with just an intake and a tune.

Well it's less about power and more about driveability and engine safety anyways.

Evil Sports · 02-17-2012, 09:31 AM

Quote:

Originally Posted by m4a1mustang

Well it's less about power and more about driveability and engine safety anyways.

But wont the on board ECM deal with this, or at least warn if its an unsafe condition

m4a1mustang · 02-17-2012, 09:43 AM

Quote:

Originally Posted by Evil Sports

But wont the on board ECM deal with this, or at least warn if its an unsafe condition

ECU can only adjust for so much. There have been instances where people with CAI/HFCs/CBE have been dangerously lean.

BigT · 02-17-2012, 09:48 AM

Quote:

Originally Posted by Evil Sports

But wont the on board ECM deal with this, or at least warn if its an unsafe condition

Yes and no. During cruise and idle, when the ECU is in closed loop, Fuel Trims are used to keep the AFR "stoich". These fuel trims can vary from positive to negative up to a certain percentage. (I'm not sure what the max percentages are for the Z.) This is mostly affected by changes to the intake tract ie different size MAF housings, new throttlebodies, intake manifolds, etc. However, when getting out of closed loop and into open loop (WOT), Fuel trims are usually NOT used. The ECU is pre-programmed to provide a certain amount of fuel based off TPS and RPM. These are the tables that are greatly affected when more airflow can get in and out of the engine. (mods) This causes a lean issue that cannot self fix and must be taken care of with a tune.

Evil Sports · 02-17-2012, 10:41 AM

That was allot of Technobabble

, some of which went over my head.
Im only doing Typhoons and AAM shorts. These wont require a tune will they?

02-17-2012, 10:41 AM	#5 (permalink)
Evil Sports Base Member Join Date: May 2011 Location: Mass Posts: 187 Drives: 11-370z-Blue-M6-ST Rep Power: 16	That was allot of Technobabble, some of which went over my head. Im only doing Typhoons and AAM shorts. These wont require a tune will they? __________________ My current Rice stable, Lexus RX 330, Nissan 370z, Honda Aquatrax turbo, Yamaha 212SS

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