Tune Help ASAP!
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 3,405
Likes: 3
From: Gboro/H-point/Reidsville NC
Tune Help ASAP!
03Z had full exhaust,plugs,wires installed.Street tune and dyno tune.The car put down 362RWHP for the baseline.After headers and the plugs and all only gained 11RWHP.Tell me why?A/F ratio is 13 across the board.The tuner said that the gas in the car would't let him add timing.The day I dropped the car off I put shell 93 in and drove it over.The headers are Kooks 1 3/4 with highflow cats that dump into B&B bulletts.They told me to drive about 2 tanks of gas through it and bring it back for another dyno tune.He said he was trying to add 28* of timing but the car would pull it out.
After dumping $1,500 on a headers system and a bill for labor/dyno time for $950.Am I the only one who thinks 11RWHP is
:.Someone,anyone who can give some help please post.
After dumping $1,500 on a headers system and a bill for labor/dyno time for $950.Am I the only one who thinks 11RWHP is
:.Someone,anyone who can give some help please post.
Burning Brakes
Joined: Jan 2009
Posts: 1,208
Likes: 0
From: Newport Beach California
03Z had full exhaust,plugs,wires installed.Street tune and dyno tune.The car put down 362RWHP for the baseline.After headers and the plugs and all only gained 11RWHP.Tell me why?A/F ratio is 13 across the board.The tuner said that the gas in the car would't let him add timing.The day I dropped the car off I put shell 93 in and drove it over.The headers are Kooks 1 3/4 with highflow cats that dump into B&B bulletts.They told me to drive about 2 tanks of gas through it and bring it back for another dyno tune.He said he was trying to add 28* of timing but the car would pull it out.
After dumping $1,500 on a headers system and a bill for labor/dyno time for $950.Am I the only one who thinks 11RWHP is:.Someone,anyone who can give some help please post.
After dumping $1,500 on a headers system and a bill for labor/dyno time for $950.Am I the only one who thinks 11RWHP is
:.Someone,anyone who can give some help please post.i picked up the same rwhp just from a $250 dynotune. Headers should add 10 rwhp at the very least, and you should have picked up 10-15 from the tune.
So I would say you should get at least 20 rwhp at the very least...
Former Vendor
Joined: Feb 2007
Posts: 2,572
Likes: 1
From: Austin Texas
I gained 31rwhp with the addition of longtube headers and no cats on my 1998 TA. 11 rwhp is too low and the base line sounds about right for a Z06. On a LS6, adding timing may not increase the horsepower and should be 22*. Sounds like the fueling is not right or there is something else going on. When reading the AFR, the cats will mess with the readout. I like measuring the AFR prior to the cats and at the exit of the headers.
Le Mans Master
Joined: Mar 2004
Posts: 5,562
Likes: 5
From: South East coast Florida
03Z had full exhaust,plugs,wires installed.Street tune and dyno tune.The car put down 362RWHP for the baseline.After headers and the plugs and all only gained 11RWHP.Tell me why?A/F ratio is 13 across the board.The tuner said that the gas in the car would't let him add timing.The day I dropped the car off I put shell 93 in and drove it over.The headers are Kooks 1 3/4 with highflow cats that dump into B&B bulletts.They told me to drive about 2 tanks of gas through it and bring it back for another dyno tune.He said he was trying to add 28* of timing but the car would pull it out.
After dumping $1,500 on a headers system and a bill for labor/dyno time for $950.Am I the only one who thinks 11RWHP is:.Someone,anyone who can give some help please post.
After dumping $1,500 on a headers system and a bill for labor/dyno time for $950.Am I the only one who thinks 11RWHP is
:.Someone,anyone who can give some help please post.The 13 AFR is not all that bad, normally it is between 12.8 and 13.2 (leanest being between the peak torque and HP rpm with a bit richer on either side. Also timing should take a bit of a drop at the peak torque rpm's as that represent maximum cylinder pressure and less timing is needed at that point.
Also it's not just all about adding timning. The timing is added based on the best torque output for a corresponding load. This takes several pulls on a load dyno to dial in.
Thanks
Ed
Melting Slicks
Joined: Feb 2001
Posts: 2,804
Likes: 358
From: Northville, MI
What you need to do is run a couple of 20 minute scan logs. The first should be an around town and some steady freeway driving and the other with a lot of aggressive launches, decels, and some red line romps. A good tuner can then analyze those results and maximize you hp/tq and daily driving settings. Would you want a 390 hp car that stumbles and jerks at low speeds, no. You would rather have a car that runs like stink and drives great every time.
Burning Brakes
Joined: Jan 2009
Posts: 1,208
Likes: 0
From: Newport Beach California
What you need to do is run a couple of 20 minute scan logs. The first should be an around town and some steady freeway driving and the other with a lot of aggressive launches, decels, and some red line romps. A good tuner can then analyze those results and maximize you hp/tq and daily driving settings. Would you want a 390 hp car that stumbles and jerks at low speeds, no. You would rather have a car that runs like stink and drives great every time.
