Tune needed?
Thread Starter
Drifting
Joined: Jun 2004
Posts: 1,627
Likes: 143
From: Goodyear Az
Tune needed?
I installed long tube headers/high flow cats, x-pipe yesterday and I've been driving it around last night for a bit and all day today. I don't think it's been driven long enough yet, but out of curiosity I checked my LTFT's w/Auto Xray and the LTFT's are at +7%. I *think* that means that the PCM is adding fuel to compensate for a lean condition, but that at WOT my car is more likely to be rich because the added fuel from the LTFTs will be added to the PE table values.
However, I've read somewhere that unless LTFTs are above 10% there's really no need to do a dyno tune unless you want those last few horses, because if you're that close you won't be getting 15 horses from a dyno tune.
So what I'm basically asking is
However, I've read somewhere that unless LTFTs are above 10% there's really no need to do a dyno tune unless you want those last few horses, because if you're that close you won't be getting 15 horses from a dyno tune.
So what I'm basically asking is
- whether my information is correct about lean/rich conditions
- is there truth in "if you're off by less than +-10 on LTFTs you're going to get 10 or fewer horses by tuning"
Thread Starter
Drifting
Joined: Jun 2004
Posts: 1,627
Likes: 143
From: Goodyear Az
Originally Posted by Threed
Tune Time...
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by nuke61
I installed long tube headers/high flow cats, x-pipe yesterday and I've been driving it around last night for a bit and all day today. I don't think it's been driven long enough yet, but out of curiosity I checked my LTFT's w/Auto Xray and the LTFT's are at +7%. I *think* that means that the PCM is adding fuel to compensate for a lean condition, but that at WOT my car is more likely to be rich because the added fuel from the LTFTs will be added to the PE table values.
However, I've read somewhere that unless LTFTs are above 10% there's really no need to do a dyno tune unless you want those last few horses, because if you're that close you won't be getting 15 horses from a dyno tune.
So what I'm basically asking is
However, I've read somewhere that unless LTFTs are above 10% there's really no need to do a dyno tune unless you want those last few horses, because if you're that close you won't be getting 15 horses from a dyno tune.
So what I'm basically asking is
- whether my information is correct about lean/rich conditions
- is there truth in "if you're off by less than +-10 on LTFTs you're going to get 10 or fewer horses by tuning"
The LTerms are designed to swing to compensate for enviromental conditions. Thats the beauty in fuel injection.
You can probally still pick up some good power with a dyno tune.. There are lots of things that can be done in a tune besides fueling to help the car. If you find a good tuner in your area you can also do quite a bit of part throttle tuning to get the LTerms even closer and improve part throttle response.
Thread Starter
Drifting
Joined: Jun 2004
Posts: 1,627
Likes: 143
From: Goodyear Az
Originally Posted by Alvin
If you find a good tuner in your area you can also do quite a bit of part throttle tuning to get the LTerms even closer and improve part throttle response.
Racer
Joined: Oct 2005
Posts: 331
Likes: 0
From: Bay Area
Try Synergy Motorsports
I am not sure how close you are to Fremont (sf bay area), but you should give SYNERGY a call. They tune lots of c5, c6 etc. and have heard nothing but great things... to go along with my own personal experience.
