Jump to content
SAU Community

Recommended Posts

So I just fitted a di fillippo 2.5inch twin system to a VU SS ute with ls1, everything else is stock..

The problem is its droning pretty bad on idle and upto 1500rpm, after that its very quiet but with a nice V8 sound coming thru, so I'm after any advice

on what to do with it. I just want a throaty, rumble without a drone , it sounds like an RB30 with no mufflers.

I've called the manufacturer and supplier, both say they've never heard of the system droning, so suggest it must be vibration of the body or touching something, well seems pretty good to me , i think its the rear resonator that maybe isn't doing much?

I have a few things in mind

1) replace rear resonator with a quality muffler like magna flow

2) see if an exhaust shop can make up a J pipe

3) add some 100cell cats and 2.5inch pipe from the manifold back,

4) the tail pipes are well over a foot long, should they be shorter?

Ive read all the commodore forums and nothing mentioned about this system except its the best etc...

Link to comment
https://www.sau.com.au/forums/topic/454175-ls1-exhaust-systems/
Share on other sites

When I bought mine it had an xforce system with 2 hotdogs at the back. Too loud especially at cruise Rpms.

Since putting in the cam (232 at 50) it was unbearable. Ended up squeezing 2 of these in at the back, not much room in a sedan, not sure if ute has more or less.

I welded the 2 mufflers together as they have to touch each other to fit. Massive reduction in volume

http://pages.ebay.com/link/?nav=item.view&id=171273988910&alt=web

Besides the cam high flow cats will make a big difference to the sound. It sounds like your system is a cat back only, correct?

I had full Di Fillippo 2.5inch twin system including headers and cats in my V2 Monaro and it sounded brilliant, much better than my R34 ;)

This was with a bigger cam and ported heads too so hard to say how much those contributed to the note...

EDIT: Also -> www.ls1.com.au

Edited by V28VX37

Its very confusing reading all the commodore forums, they all say this system is the best, so ive spent $800 thinking that it would sound nice and meaty, it does on the youtube clips,

the local supplier and the main business in Melbourne both say its very unusual and unheard of that the system would drone..

Ive had several opinions, probably all biased because they are business's that want some $$ spent at there shop.. they all agree that adding extractors and cats will make it worse and seem to think that the system is a rebranded redback system and just shit, the company says that's not possible as they only supply the "di fillippo" label to be welded to there system and cant be just bought and rebranded....

Ok so , latest word from the company is, " We have a VU ute here with same system and no drone or issue's, but first run the exhaust for 1000km's to "bed it in" and then let us know and we'll try to fix it".

so do you guys think, will this exhaust stop droning once it has done 1000km's?????

post-70965-0-65315600-1424867196_thumb.jpg

post-70965-0-32880300-1424867238_thumb.jpg

post-70965-0-59326900-1424867263_thumb.jpg

post-70965-0-54991100-1424867291_thumb.jpg

Edited by AngryRB

Once the packing in the mufflers bed in it will sound different, but not that different. Doubt it will happen in 1000k either.

Lol @ their response of never hearing one drone and blame fitment. So their exhausts have fitment issues?

Take a video and send it to them.

Ben- that looks like a good idea,

what did it sound like with them on the back? I still want the V8 rumble etc just not the drone, at the moment Its all engine above 2500rpm, which is almost silent.

Edited by AngryRB

Stegea97- at first it wouldn't fit up, but then I loosened the bolts on the cat pipes and manifold to cat pipes and it seems to bold up ok, but it does seem to hang quiet low at the rear, could do with being tucked up as theres almost a foot clearance above the rear resonator, as seen in pics.

I'm talking about the rear muffler, replacing that with two. Hooker aero chamber mufflers are sweet but wouldn't fit at the rear, and are slightly tricky to fit in the center of a commodore, as you really need offset in and out. And more expensive.

I'm surprised to see the exhaust uses slip joints at the back, that's a bit crusty. A proper bolted flanged connection like factory (and xforce ) is heaps nicer.

Do these engines need such large exhausts? a single 3inch on a skyline is enough for over 300kw's, the plan was to get the cat pipes and cats done next and then OTR plus tune and be happy with whatever that puts out, maybe 220-240kw's..

I have a single 3inch X force muffler that sounded good on the skyline, seeing as the rear muffler is so far back from the engine, would this work without

suffocating the flow?

Edited by AngryRB

what is 'best' is mainly subjective, as is perception of drone. I have a twin 3" Xforce on mine with 100cpi cats, 4 into 1 extractors and a H type merge. Sounds good, but at 100km/h on a slight incline in 6th it will drone. I'm not worried because I generally turn the music up louder. Sounds great otherwise, and not insanely loud unless you stand on it.

You don't lose anything down low with bigger pipes, but you will gain a little bit up the top and it gives the LS a deeper note.

I wouldn't be f**king with a DF exhaust unless you already had cats and extractors and it still sounded crap. Bear in mind that you'll want a tune after that point.

Whatever you do' don't drop the rear resonator, it'll make it drone terribly. Remove centre mufflers if you intend on removing anything.

I also used to run no cat and a straight pipe on my Skyline though haha.

Oh and Commodore forums are pretty ordinary for the most part. Grumpy old men on LS1.com.au and mang machine warriors on JC.

Edited by bozodos
  • Like 1

hmm, just took off the resonator off the rear, and Fark!!!! thing sounds like a V8 for the first time,

been told by local exhaust shop that its illegal and if i weld straight pipes to the back it will drone big time. arrgggghhhh!!! :domokun:

Question- If a 3inch exhaust can make 300rwkw's on Skyline, can an Ls1 make the same 300rwkws? if not how much?

Question- How would a Jap muffler, eg. HKS hi power silent with silencer sound on a LS1? same same or epic fail haha

Take into consideration that 250kw's is the target max power and just after a decent sound with no drone.....

Edited by AngryRB

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • LOL, all of the CAI like Craig I just need to put a hole saw through my bumper Done and dusted, the car runs, which is nice, I'll take it for a spin when the weather clears up Just need to put the bumper back on for good
    • Brooooo Please send ABS control unit schematic Please! R33 gts25t ABS (Its two plug ecu, black and white) wire colors possible? [email protected]
    • Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
×
×
  • Create New...