Jump to content
SAU Community

Recommended Posts

Thinking of buying this oval veilside Jasma muffler as well but worried it will be much louder than my Xforce oval (I know its jasma approved, but the body is not too big..), it looks to be free flow?

What do you guys think? :unsure:

post-49401-0-57539700-1395968588_thumb.jpeg

post-49401-0-46789500-1395968599_thumb.jpeg

post-49401-0-74784700-1395968610_thumb.jpeg

It'll probably be louder as you suspect. But at least there will be no restriction.

Just do it. if you don't like it, move it on. By the same token.........I don't think there could be any suspicion that the Xforce oval is restrictive. A straight through 3" is a straight through 3" in terms of what it can flow, give or take a few % point here and there for different perforation styles. So why not put your existing rear onto the cheaparse system from the previous page? If you're going to start cutting and shutting exhausts, you might as well cut up the one you already have and don't like.

By the same same token, which not just buy a decent 3" mid and stick that into your existing system in place of the shitty one that's on there now? Sounds like less f**king around than any of the options you have come up with or that I listed above.

Neither way will likely fix your power issue, but I guess you need to follow your tuner's instructions no matter how much it costs in wasted time and parts. At what point do you pull the pin though?

  • Like 1

Well.. I will get that cheap arse exhaust, at least the main element, (the gutted catco cat) is there as well as the 3" mid-muffler. I wont take that ugly canon though. I might just buy the Jasma oval above if I don't find anything better.

Even Yavuz said my rear muffler might not be such a problem, but the cat definitely.. But you can see from previous pics the Xforce has a small hole outlet. If they fail to deliver results and come up with something else 'restricting my car',..well, time to move on...

post-49401-0-22042400-1395978657_thumb.jpg

I don't know why people run the risk of a $10k fine for 0 performance gain by gutting the cat, when for a couple hundred you can get a good cat that flows more then you need, on top of that when the cat "ignites" it helps keep the gas hot and hot gas moves faster then cold

I had an 80mm decat made for my 32 for drag racing, went to the drags did a run then changed to the decat did another run and they where both exactly the same time and speed, if your cat is a restriction then buy a new one that isn't

Looks ok and fairly straight thru inside the veilside muffler

Also the bigger the rear muffler is the more sound it will suppress Aslong as it's still true 3inch straight thru

And your starting to head over 20psi and close to 300rwkw so the 2.5inch neck down in the rear will start to hurt power up top as 2.5inch is only good for 250rwkw

Bought me a present, 3 inch used gutted cat and the Veilside Jasma oval muffler 5-6 threads up, its 3.5 inch straight thru however. Body size is 6X11X14.5 long in inches, my current xforce oval is 6X10X16 long so hoping the replacement wont be much louder.

Now need to find the largest 3 inch oval mid-muffler I can cram under there, any suggestions? ;-)

post-49401-13960777319188_thumb.jpg

post-49401-13960777498574_thumb.jpg

So u saying no need to put it on? What about my 2.7inch mid muffler necking on one outlet? Well it actually looks like it maybe 3 inside just the pipe is necked down at joint..? No idea why

Not, not saying that. Let's face it. The car used to make more power, now it makes less. Either the PowerFC sucks or the cat has a problem. The mufflers haven't changed, therefore they aren't the cause, is all. Bigger is always better (if perhaps louder), so go ahead and redo your exhaust. But just don't expect to identify what the actual problem was if you change everything all at the same time. If you only swap out the cat for something that won't be a restriction, and redyno and it all comes good, then it was the cat. Same for any other component. Change all of them though, and it comes good....and then wonder which one was the bad one, or maybe if it was the sum of the parts. Having said that last bit, re-read my 5th sentence.

Lol the power FC cant suck, it is a constant and proven in many cars. The tune can suck of course, and in my case as mentioned its had timing retarded big time everywhere. And power (lack of) been suggested to a restrictive cat. And of course its cheaper to replace the exhaust components in one go and have a touch up tune, and if it makes power then u know its the combination of these components that was the problem but wont be able to identify which one.. Which doesnt really matter when you are able to pick this cat for 30bux and Veilside oval for 50..

  • 1 month later...

If you want quiet and free flowing ring Kirawee Mufflers , my exhaust is 3.5 to 3" necking back through a 200 cel Xforce cat and the mufflers are I think Redback . The rear is 20" long and something like 6 x 11 . They can get them in 3.5" as well . It fits up very neatly and the single 3" outlet looks really conservative .

A .

If it were me I'd replace the exhaust as it is obviously bothering you. Don't you just hate it when you truly believe something isn't right and 6mths later you wish you had changed it ? Seems stupid to get a tune then end up changing the exhaust anyway. Do it once, do it right. I have just changed my dump pipe from 3" to 3.5" using the cat as a step down. The difference is chalk and cheese. Whoever said a bigger exhaust slows down the flow has rocks in their head. Revs faster harder, more power everywhere from idle to full boost. Strangely, it is quieter. Now I want to go full 3.5" all the way to see what my little 3071r is capable of.

  • 2 weeks later...

Update- cat replaced with hollow 3" compliance cat (for now) and necking in mid muffler eliminated. Drive feel on road was noticeably punchier n free-er on mid-high rpms. Then after touch up tune- a dissapointing 280rwkw at 22psi dropping to 18psi. Is this why I made low power? Precision 5558 on 98/ Rb25.

Previous boost drop was 2psi, now its 4 psi?? Only 10kw gain from previous 270rwkw at 20psi. But hugely different drive-a lot punchier n snappier in all gears and a lot more torque/boost in low rpms from feel - lighter throttle input required in low rpms. See dyno sheet.

One big problem is that during downshifts as in overtaking or motorway pulls from 4th to 3rd or 3rd to 2nd there is a massive power loss for 3-4 secs and then it suddenly boosts and pulls hard as normal. During this time it is like 50-60% down on power -like hitting a brickwall or NA yaris/civic spec torque. It ONLY happens on downshifts not upshifts. Is it tune related or a BOV or boost leak? Yavuz and Mark have confirmed the tune is as good as should be.

post-49401-13997651993846_thumb.jpg

Thats odd. Did they play with the tune much after you fixed the exhaust? I would expect it would need a bit of playing around with the tune, not as much as if it were a MAP based ECU

The precisions are ball bearing arent they? Sounds like it cant be a turbo issue, but it nearly sounds like when you drop a gear the turbo takes forever to get up to the speed it should be at. This makes me think its ECU related, as if its going to cells that the car never really reached before and the tuners just made safe just in case it ever did unexpectedly Even a boost leak it should sound like it wants to take off.

Thats certainly a strange one.... but the fact that you have gained power on effectively less boost (up top) and the better driveability at least proves that the exhaust was a problem

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

    • For these last 7 years of ownership, I've always had to use a small scissor jack under one of the front tow hooks to raise the front just enough so my low-profile jack fits under to reach my subframe jack point. I'm beginning to get annoyed of always having to do this. Are there any lower low-profile jacks that fit under the gtr lip on a dropped car?
    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
×
×
  • Create New...