My 98 has a mild cam and is otherwise stock as far as the engine is concerned. I had a dyno tune after the cam was installed.

My question is this, if I add a set of long tube headers do I need a new dyno tune or can I get by with a mail order or no tune?

I'm not excited about adding another $500 to the cost of headers if I don't need it...

Also, will the headers change the exhaust sound? I have a Z06 Titanium exhaust axle back system.

Thanks.

 

I would say yes a tune is needed. Especially if your going from stock manifolds to long tubes. Your freeing up alot more air flow. Probably will change exhaust note for the better.

When I brought my LS2 for a dyno tune it was $300 or 350 for 3 runs, can't remember which. Made changes and went back and he charged me $225.00. Added a cam went back and only charged me $100.00.

Try going back to the same place and you might get a smaller charge. These are just my opinions and I could be wrong about your situation.

 

NO; you do not NEED a tune. Anything that changes the motor's efficiency will change VE tables and could benefit from a "tweaking" At best, it might change WOT AFR just slightly, but the LTFTs will make the changes necessary after you drive it a little.
Headers will change the exhaust sound

 

Yes sound with change, yes you should get a tune. You will have the engine light on from the change that the sensors see.

 

Go to the same place and ask what it will cost for an updated tune.

 

Is It required as you asked? No. The car will run and drive on stock tune.

Is it recommended? Sure. If you want to get the most out of it.

I'm still on stock tune with car.

 

Thanks for all the replies to my question.

I'm going to pull the trigger on a set from one of the vendors here. Either the LGs or the Kooks.

Appreciate the feedback.

 

LG Super Pro 1-3/4" primaries best header for stock cube LS1/LS6. White Out is on the money about the sound. I had LT's no cats on my 02 C5z run through the Ti system and it sounded good but nothing crazy. On my modded 99 Coupe I had LT's run through Corsa Sport System (Indy Pace Car) and it shrieked!!

As others have suggested, if possible go back to who did your cam install/tune and the adjustments should be minor but to see the full benefit of your investment in headers it is a necessary step. Also as previously stated in a post above, changes to tune will be minor and cost should reflect this. The tuner that did original tune has a cost for a license/credit fee to HP Tuners or EFI Live for tunes which may have various packages or ways to pay but nonetheless they had a one time fee which has to be covered. A re-tune by the same tuner has already paid the license/credit fee for your car so no extra cost to them. Go to a different tuner and they will have to cover the cost of a new license/credit.

 

I found with just headers that my car actually leaned out from the overly rich factory tuning to be about right AFR wise. so, tuning did sharpen everything and make the part throttle better but it didn't change the wide open throttle AFR much. So, tuning wasn't required to drive the car without worrying about engine damage.

Now, since you are already modified and tuned, it might go too lean without more tuning. It would still run and drive but it might not be very safe to run it hard.

 

I know this is an old thread...wondering how the engine responded to the cam with the stock heads and exhaust manifolds?

 

Yes.

 

also YES !!!!!!

 

Hi, Maybe someone can answer this for me. Cannot find any info on this. I have headers and a full tune on my Z06 with Borla mufflers. Can you switch back over to the stock Ti's without having to retune the car? Any help appreciate it.

 

Highly doubt you'll need a tune from mufflers, they all flow pretty close to one another.

 

Thanks for the info, I'm thinking about switching over but kind of want to make sure it would be no issues.

 

I currently have HCI Supercharger setup on my Z06. If the police require me to pass smog, I would need to exchange my LT headers with the stock manifold and piping. I currently have it tuned with BB LT headers w/ stock H pipe and Corsa Sport exhaust. Would it be an easy swap and what will happen when I put the stock manifold and piping back in place of my BB LT headers? Thank you for any feedback!

 

Absolutely with LT headers you need a re tune !
Reason being LT headers are iilegal in most states Because when installing LT's you move the front 02 locations as much as 2-3 FT aft---the stock Front 02's are not designed to read properly that far back and as a result the 02's read wrong and don't heat up correctly This makes your engine run RICH at P/T The front 02's control all your P/T fueling and when rich that richness carries over to WOT fueling as well
Often without tuning a LT install will make maybe even less HP and TQ or just a small gain because of the richness
But once tuned you can get the full benefit of the LT's and can expect 20-30 RWHP gains
A tuner must use a wideband 02 sensor set-up to accrately dial in tour AFR's at WOT The tune is well worth the $$$
ALSO I would not reccomend a mail order tune as it is only "their best guess" on the fueling as they never drive the car
A mail order tune is better than nothing BUT if you are serious about making MAX HP from your mods you need a tuner who DRIVES your car to get the best availiable HP