Need tune for ORY?

**00hawk109** · 05-10-2011, 03:13 AM

I recently put a ORY on my car. DO I need to tune the car so that it does not run as rich or will it be fine for my motor without a tune for a while?

**pajeff02** · 05-10-2011, 03:32 AM

Any mod that enhances airflow through the engine has an affect on fueling. The upstream O2 senders and MAF are able to compensate for these differences, however, your volumetric efficiency (VE) table will not be as accurate as with the stock exhaust.

If you have access to a scanner you can see your long and short term fuel trims. These should hover close to zero which means that your PCM is not adding or subtracting fuel to or from the engine. Anything greater or less than than a steady + or -5 to 8 on the trims is probably indicative of the need to recalibrate the VE table.

Someone with more tuning experience can most likely provide a better response.

**Spaz** · 05-10-2011, 05:05 AM

yes... unless you've already had the rear 02's tuned off you'll need that done...

**KMdef9** · 05-10-2011, 08:10 AM

Originally Posted by pajeff02

Any mod that enhances airflow through the engine has an affect on fueling. The upstream O2 senders and MAF are able to compensate for these differences, however, your volumetric efficiency (VE) table will not be as accurate as with the stock exhaust.

If you have access to a scanner you can see your long and short term fuel trims. These should hover close to zero which means that your PCM is not adding or subtracting fuel to or from the engine. Anything greater or less than than a steady + or -5 to 8 on the trims is probably indicative of the need to recalibrate the VE table.

Someone with more tuning experience can most likely provide a better response.

Pretty sure you hit the nail on the head, lol.

**Knight** · 05-12-2011, 04:25 AM

How long is a while? I know quite a few people who have installed LTs and an ORY, and haven't had their car tuned. No problems except the pesky SES light. To take full advantage, and make the engine run the most efficient, you would benefit from a tune. But if you plan to do some other mods anytime soon, I'd wait to get the tune until after you do them.

**KMdef9** · 05-12-2011, 06:35 AM

Forgot to mention, site sponsor and member 'Frost' does mail order bench tuning for mods like LT's, ORY and a long list of others. Check out his site.

http://www.tunedbyfrost.com/

**Frost** · 05-12-2011, 07:09 AM

Originally Posted by Knight

How long is a while? I know quite a few people who have installed LTs and an ORY, and haven't had their car tuned. No problems except the pesky SES light. To take full advantage, and make the engine run the most efficient, you would benefit from a tune. But if you plan to do some other mods anytime soon, I'd wait to get the tune until after you do them.

Sounds like solid advice, but it does suck to always have the SES on. When it's on for something like this and there is a real problem, you may not know about it since the light is already on.