is a Tune REQUIRED after new Exhaust Fitted ?

[Instance56]

I had a quick look throught a few Topics and i couldn't find any definitive Answer as to weather a Tune is required after a Full Exhaust System is fitted.

I do plan on getting a tune in the near future but will thier be any negative effects to not having the new exhaust tuned Straight away ? or is it okay for a few weeks ?

Thnx.

[forestjim]

I had a quick look throught a few Topics and i couldn't find any definitive Answer as to weather a Tune is required after a Full Exhaust System is fitted.

I do plan on getting a tune in the near future but will thier be any negative effects to not having the new exhaust tuned Straight away ? or is it okay for a few weeks ?

Thnx.

I don't think so. I have done zorst of a few car and not tuned all of them.

If the car is running ok, you don't need a tune.

Hope this helps

Marty

[ssgirl2]

A tune isn't REQUIRED after a new exhaust is fitted. If you plan further mods, you can wait until they're done and get the tune then :)

[Wonky]

Not required but a tune will make the most of the new system. No problem at all to not have one but you may find as the ECU gets used to the new system you may lose some of the power you initially gained.

Years ago before I got on here and learned about tunes etc I put a 3" system on my otherwise stock VY SV8. When first done it started chirping the tyres on changes to 2nd (A4) but after about a week it wouldn't do that any more. From what I've since read the ECU adjusted itself back over that time.

[BLAZEY]

it depends on what car you have....

if it is a 6ltr you will have to due to the 4 o2 sensers will log codes

[Dillzio]

A tune is only required to get everything running at peak efficiency. It might be running at 2% less than it's peak without the tune, but i'm sure you can live with that. Wait until you've done enough mods to last you a while then get it tuned.

[ringram]

A maf tune will be closer than a speed density tune depending on how restrictive your old exhaust was. MAF will read extra airflow. Speeddensity/mafless will think its the same as before. Worse case you will run a little leaner, no biggie as long as your not on the cutting edge. If you are stock, dont worry about it. A reset of your PCM might be good though to reset fuel trims.

[Instance56]

So a Maf Tune with OTRCAI will make the best of a Twin 3" Full system ?

[Wonky]

So a Maf Tune with OTRCAI will make the best of a Twin 3" Full system ?

What car and mods are we talking about? Even on VE there are some who argue that twin 3" will kill low down torque (not evident on mine) but on LS1 which lacks torque down low already that is supposedly even more the case. That said, I'd go twin 3" for the sound even if it did lose me a few kw! :yup:

[Instance56]

Sorry . my car is a VY monaro and i think if anything car feels like it has More torque then it did before the Twin 3" and it sound is worth the risk of loosing a few Kw's.

The main Mods to come would be some Cam's then the mafless tune i would think.

[Space Pope]

Generally, a tune isn't essential for a new exhaust. It does however help make the most of any additional flow.

Not sure a dual 3" system is the best choice for a stock LS1, gas speeds and temps might be a bit ordinary further back in the system... but if it feels and sounds good to you, then that's the main thing. :)

[Instance56]

Generally, a tune isn't essential for a new exhaust. It does however help make the most of any additional flow.

Not sure a dual 3" system is the best choice for a stock LS1, gas speeds and temps might be a bit ordinary further back in the system... but if it feels and sounds good to you, then that's the main thing. :)

Ya that was my original concern was that it might run a bit ordinary until i had it tuned however it feels if anything better than before , but 1nce the Cam's go in im sure it will make a bit more use of the Exhaust then :P.

[Brandonsdad]

it depends on what car you have....

if it is a 6ltr you will have to due to the 4 o2 sensers will log codes

Can anyone confirm this on a VE. Am getting 2.5 inch with tri-y's and new cats.

[SmickSS]

Im looking at puting twin 3inch on mine, it already has full maffless tune, otr intake, pacemaker 4into1s ito twin 21/2 into twin 3inch ot the back, sounds great, if i went twin 3inch all yhe way through would i lose power, at the moment my best time is a 12.8, cheers

[PBoB]

Can anyone confirm this on a VE. Am getting 2.5 inch with tri-y's and new cats.

I have been told by tuners that with your stock cats, the O2 reading before and after your cats are usually different (therefore your cars 'computer' knows the cats are doing their job) when you change your cats sometimes the reading then becomes the same (obviously, because the new cats are a 'higher flow'), therefore it can cause your car to throw a 'Check Powertrain' or 'Check Engine' light. A simple tune can turn this off.

[Brandonsdad]

I have been told by tuners that with your stock cats, the O2 reading before and after your cats are usually different (therefore your cars 'computer' knows the cats are doing their job) when you change your cats sometimes the reading then becomes the same (obviously, because the new cats are a 'higher flow'), therefore it can cause your car to throw a 'Check Powertrain' or 'Check Engine' light. A simple tune can turn this off.

A simple tune? Would that involve a simple $1000?
If it does throw a warning light does the car go into limp home mode or just a light stays lit up on the dash.
Thanks.

[CSP]

A simple tune? Would that involve a simple $1000?
If it does throw a warning light does the car go into limp home mode or just a light stays lit up on the dash.
Thanks.

Can get an LS2 tune here in the ACT for about $800.

I had the engine throw codes (2 according to GenTech) on my Calais and the Check Engine light came on. It's not adversely affecting anything. It just gets annoying is all.

[crack07]

It all depends on which headers you use. If you use the short ones and use original cats no problem and no tune required. If you choose the long headers (new cats mandatory)the cats are further away and don't heat up enough causing the ECU to through a code or two. Personally I went with the long pacemakers, ( could not see how the small headers would do any better than standard)highflow cats,twin 2.5 and a tune the difference it made to the car was outstanding not to mention the sound.

[Brandonsdad]

It all depends on which headers you use. If you use the short ones and use original cats no problem and no tune required. If you choose the long headers (new cats mandatory)the cats are further away and don't heat up enough causing the ECU to through a code or two. Personally I went with the long pacemakers, ( could not see how the small headers would do any better than standard)highflow cats,twin 2.5 and a tune the difference it made to the car was outstanding not to mention the sound.

That sound perfect then. So you would suggest keep standard manifold and just get cats and 2.5 system and tune. No Headers.

[crack07]

Sorry I think I've confused you. If are going to get a tune then fit the long headers and new cats, if you don't want to get a tune then I would only fit a cat back exhaust as the small headers finish in the exactly same spot as the standard and are virtually the same price as the fully tuned long headers. I do was undecided when looking to fit an exhaust, did not really want to get a tune in case it caused warranty issues, but after getting a few quotes on both options and test driving an R8 with the tune and system then extra $700.00 was well spend . It completely transforms the car especially in the mid range and gives a great increase in power mine made 270rwkw. So far no problems at all. It has been on the car for about 5 months. Hope this helps.

[Brandonsdad]

Sorry I think I've confused you. If are going to get a tune then fit the long headers and new cats, if you don't want to get a tune then I would only fit a cat back exhaust as the small headers finish in the exactly same spot as the standard and are virtually the same price as the fully tuned long headers. I do was undecided when looking to fit an exhaust, did not really want to get a tune in case it caused warranty issues, but after getting a few quotes on both options and test driving an R8 with the tune and system then extra $700.00 was well spend . It completely transforms the car especially in the mid range and gives a great increase in power mine made 270rwkw. So far no problems at all. It has been on the car for about 5 months. Hope this helps.

Yes very helpful, but I am not confused at all.
I am wanting to get a tune done anyway but was under the impression that if I got the whole system done that it would be undriveable and would need a tune straight away, but I now know different. Arent the standard manifolds quite free flowing or is there a big improvement in headers. I would only get short headers and get highflow cats in original position. So basically I would go 2.5 inch system from cats to rear. Only original part left would be manifold. Worth the extra $800 to $900 for headers?

[crack07]

Personally i reckon $800 well spent the headers give a fairly healthy increase in power and sound great. The only real problem I have is the new cats scrapping on just about everything due to the long headers and the car being lowered.

[Brandonsdad]

Personally i reckon $800 well spent the headers give a fairly healthy increase in power and sound great. The only real problem I have is the new cats scrapping on just about everything due to the long headers and the car being lowered.

If you went the short headers then there would be no scraping then would there. So having said that, are the short headers any better than the standard manifold in relation to flow. I presume the headers will give it a bit more V8 sound though. Have heard that headers dont give good gains on VE's like previous models or is that only on HSV's.

[Wonky]

If you went the short headers then there would be no scraping then would there. So having said that, are the short headers any better than the standard manifold in relation to flow. I presume the headers will give it a bit more V8 sound though. Have heard that headers dont give good gains on VE's like previous models or is that only on HSV's.
Some people reckon the standard manifolds are pretty good and early on KPM (I think it was) did some testing that suggested the shorty HSV headers were pretty good and the long Pacies only gained about 5kw over them, so I originally got hold of a set of GTS headers and cats and had them put on.

A few months ago I was able to afford a set of long Pacey 4-1s and high flow cats (KPM) with a newer version of their 3" catback I already had. I gained 14rwkw and I'm sure Mustanger gained a similar figure when he went from GTS headers/cats to Pacies and long flow cats plus I've heard similar figures from others, so worth doing.

If you want to stay short then I've heard the HM short headers and high flow cats are pretty good. One person says he gained 17rwkw with them over standard SSV stuff but that's a bit of a rubbery figure as the before and after readings were done on two different dynos (which experience shows read similarly) with guesstimation as to the overall increase based on cars which had had runs on both.

BlackSSV8 also had HM shorty headers and cats put on, plus pod filter and tune and his gain was not far short of similar cars with 'long' X-Force extractors/cats or Pacies. They seem a reasonable option if you want to keep cats in original position, though are about the same price all up as Pacies and metal substrate high flow cats.

[CSP]

Heard a comment today that went along the lines of:

"If you get a full exhaust system in the VE, the computer throws a check engine warning which is removed by the tuners when they tune the car. But if you have ANY other engine problems, Holden will turn around and say they aren't covered by warranty because your had reprogrammed the computer to remove the Check Engine warning"

Anyone confirm/deny/clarify???

[Wonky]

.......BlackSSV8 also had HM shorty headers and cats put on

:doh: Sorry, got the name wrong. SS6LV8. Knew it didn't sound right.

[Brandonsdad]

Heard a comment today that went along the lines of:

"If you get a full exhaust system in the VE, the computer throws a check engine warning which is removed by the tuners when they tune the car. But if you have ANY other engine problems, Holden will turn around and say they aren't covered by warranty because your had reprogrammed the computer to remove the Check Engine warning"

Anyone confirm/deny/clarify???

I think you only get the check engine warning if the cats are moved to make way for long headers, hench the reason I want to go short headers or stay with std manifold. With the cats in different position the exhaust temp is different or somethingaratha and on comes the warning. Aparently Holdens have been told that if cars come with warranty issues and the cats are in a different position, then any problems will not be covered if it can be blamed on that.