Jump to content
SAU Community

Recommended Posts

Sup. Just like my cat thread, I need some advice.

I was wondering if you guys have had much experience with the HPI exhaust products, specifically the bellmouth dump pipes for the rb26.

After a few quality probs with some exhaust products I purchased, and some info I've found on here re: split dumps - I've decided to go back to stock manifolds, with bellmouth dumps.

I've been told by JJ's that these dumps are very high quality - and I'm told they are manufactured in Japan.

Thanks in advance for any advice. I'm sure a few people must have these fitted, were the welds good? Decent thickness? Noise levels?

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/
Share on other sites

Just to complete my thread. I received these ones today from JJ's. The welds are practically immaculate. There is no excess weld, dags, or loose steel in these. Compared to the .. other product, these are mint. Cost 900 odd (from a trusted company), overnight delivery, thick steel. The only gripe I have is they don't have provisions to mount the old shrouds, but that's a small niggle about a very good product.

Will be fitting them with new -5's this weekend. Might come back once more in a few months to add whether they've lasted or not (which I think they will :D)

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5329231
Share on other sites

  • 3 weeks later...

the current hpi ones are definately better than the current tomai ones.

hpi is a fantastic brand, a lil exxy but the quality that i have seen first hand is top notch

the x force are good too though a bit cheaper too

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5357686
Share on other sites

I've been researching a fair bit regarding replacement dump pipes for my GTR. It seems as though the single bell units offer better performance gains making them a worthwhile upgrade than the dual channel variants.

I have noticed that these enlarged single dumps that are say, a foot in length cost upwards of $860 for a pair.... I know they are stainless but that is a fair bit in comparison to some of the other split dumps that exist.

So i guess what I'm asking is, are there any similar brands offering bell dumps for say $600??

Thanks

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5358082
Share on other sites

Don't bother with the split designs (HKS and every person and their dog who has copied this design like CES, XForce etc have done, and just about every Chinese knockoff, autobahn888 etc), the split is just too short to be worthwhile. Also bear in mind at the bare minimum, the rear turbo (or front if I've got it backwards) has to be removed to fit new dumps, unless you are making over 350kw I would stick to stockers.

If you have your heart set on bellmouth dumps, wait abit for the australia dollar <-> japanese yen to get better and you could import a pair (HPI, Tomei etc) for just alittle over $600

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5358396
Share on other sites

Thanks lance, i gathered that would be the case. I'm looking at upgrading turbo's so i considered looking at doing the dumps aswell. Really curious as to why other manufacturers (locals) haven't had a go at putting together a decent bell dump.

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5358638
Share on other sites

I am pretty sure the HPI dumps are quality items. I was trying to bid for some on yahoo auctions but they just got to expensive.

You get get some tomei ones these days for around $700-$800.

I ended buying some 2nd hand ces race pipes. They are a split pipe design but they are similar to the trust front pipe system, not just short dumps.

Anyway let us know how you go with the -5's. I have a pair of these also waiting to go on.

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5359085
Share on other sites

I have noticed that these enlarged single dumps that are say, a foot in length cost upwards of $860 for a pair.... I know they are stainless but that is a fair bit in comparison to some of the other split dumps that exist.

So i guess what I'm asking is, are there any similar brands offering bell dumps for say $600??

Thanks

One of the reasons the split dumps are cheaper is because when you look at them, the pipes are the same diameter from one end to the other. This is a simple case of bending the pipes to the right angles, and welding away. The bell mouth adds complexity to manufacturing, which adds to the cost. You aren't getting "ripped off" paying extra for the bell mouths since they cost more to manufacture.

From what I've read, the split dumps will give you boost creep on upgraded turbos. On a side note with the splits they usually come with a "divider" that sits in the turbo's exhaust housing to split the gasses. Well my -5's have sort of a divider in them already, and it's got a vein cut in it (I assume for better backpressure/wastegate gasses control) so I wouldn't be using the"divider" that came with the pipe. And besides the ones that come on the dump pipes aren't the same shape as the one's that come with the -5's. Steer clear all together with the splits.

Basically, I went through this a few weeks ago with the same things in mind. I didn't want to spend $800+ on dumps, but now I have, and I know I've made the best decision. (bar looking for 33/43 dumps for my 32)

Link to comment
https://www.sau.com.au/forums/topic/327120-hpi-dump-pipes/#findComment-5361930
Share on other sites

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

    • Yeah i found that alot of parts can be wrong or "very" hard to get the real right one. I already bought some brakes years ago on me "old" GT calipers and they were wrong too 😄  I told them too. Even send them pictures...but they said "EBC catalogue has them on my car... So i dont know what their answer will be. I call monday them and let them know that they are really not on my car. If they were they would be already on a car...
    • Welcome to Skyline ownership. Yes, it is entirely possible parts websites get things wrong. There's a whole world of inaccuracies out there when it comes to R34 stuff (and probably 33 and 32). Lots of things that are 'just bolt on, entirely interchangable' aren't. Even between S1 and S2 R34's. Yes they have a GTT item supposedly being 296mm. This is incorrect. I would call whoever you got them from and return them and let them know the GTT actually uses 310mm rotors. Depending on where you got them from your experience and success will obviously vary.
    • Hi...a bit a "development" on the brakes. I spoke to the guys where i get brakes from...and they are saying that 296mm EBC are for R34 GT-T. I then went to their site: https://www.ebcbrakes.com/vehicle/uk-row/NISSAN/Skyline (R34)/ and search for my car(R34 GT 1998 - it has GTT brakes) and it show me this USR1229 number and they are rly 296mm rotors... So now iam rly confused... The rotors i have now on the car are 310mm asi shown... So where is the problem? Does the whole EBC got it wrong or my calipers are just...idk know what?  
    • Oh What the hell, I used to get a "are you sure you want to reply, this thread is XX months old" message. Maybe a software update remove that. My bad.
    • This is a recipe for disaster* Note: Disaster is relative. The thing that often gets lost in threads like this is what is considered acceptable poke and compromise between what one person considers 'good' looks and what someone else does. The quoted specs would sit absurdly outside the guards with the spacers mentioned and need  REALLY thin tyres and a LOT of camber AND rolling the guards to fit. Some people love this. Some people consider this a ruined car. One thing is for certain though, rolling the guards is pretty much mandatory for any 'good' fitment (of either variety). It is often the difference between any fitment remotely close to the guards. "Not to mention the rears were like a mm from hitting the coilovers." I have a question though - This spec is VERY close to what I was planning to buy relative to the inboard suspension - I have an offset measuring tool on the way to confirm it. When you say "like a mm" do you mean literally 1mm? Or 2mm? Cause that's enough clearance for me in the rear :p I actually found the more limiting factor ISNT the coilover but the actual suspension arms. Did you take a look at how close those were?
×
×
  • Create New...