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

    • My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
    • BTW I measured the jack I have, it is 70mm at the saddle but you only have about 700 until it returns to 150mm high at the cylinder so it is good but no magic bullet.
    • My experience with Rising Sun Exports Before agreeing to the sale I tried to do as much research as I could (obviously), his Facebook reviews are 98% and he goes Live at least once or twice a week. I contacted 2 people in the UK who had used him for their imports, both had positive feedback. His explanation and talk through of the import process was thorough, answering any query no matter how stupid it was. It felt as soon as the money was sent, communication dropped off. I asked for shipping updates every 2 weeks or so, not wanting to pester him, he never had any updates. I wasn't informed the car had been dropped off at the port, I only found out by his Facebook story. I asked for the photos taken at the port, knowing he would need some for insurance purposes. I received a few 5 second clips and that's it. When asked again, he said his staff had them. Weeks later I asked again, he tells me he doesn't have any, but does have 50 photos from the original advert. I never received them. I eventually got the documents sent via WhatsApp after I mentioned the port was requesting them. I purchased a CarVX report, to find out the vehicle is a Grade R with recorded accident damage, first recorded in 2017 when it was first auctioned. He never told me the grade, then again I didn't ask. His response was "Grade R means nothing, it wasn't chassis damage". Still, I would have liked to have been informed about it. Jon prides himself on being open and honest when it comes to inspecting cars, it's his main job doing so at the auctions for customers. When the vehicle arrived in the UK I noticed a few little cosmetic issues. It's a 21 year old car so it wasn't going to be mint condition. The side skirts are cracked on each corner and the sealant is failing. The front grill on the bonnet/hood isn't secured very well, mounting studs are missing. Both minor things, but again, it would have been nice to be told. During a Facebook Live walk around video of the vehicle, he mentioned it has a front Whiteline anti roll bar/sway bar. While on the inspection ramp, I noticed the stock item has been installed. When first questioned, his response was "the ARB? Switched? Since when, it never had them". Since sending video and photo evidence I've not received a response. I'm probably being over critical of the overall condition of an old car, but all I wanted was honesty (which he claims to have). I'm aware I wasn't his only customer, he's busy doing XYZ but other reviews praise him for great communication with regular updates and photos, I felt I didn't receive the same treatment. 
×
×
  • Create New...