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silvershark44
05-11-06, 18:41
Very strange question, but im interested in going BPU, but I really want to keep the stock look of the car so would be keeping the standard exhaust. If I have to double decat, is this going to make the exhaust really loud and droney? Dont get me wrong I do like that sort of thing normally, but for my car I want to remain very discrete. I love modified supras, but im deliberately keeping a stock look just to be a little different, and plus I believe that unless oyu have a lot of cash to throw at it you shouldnt bother.

So how discrete can BPU be? I dont mind noise so much on the outside of the vehicle, but I dont want to hear it droning on the motorway.

:search:

Pig
05-11-06, 18:43
The stock exhaust will still be quiet. Dont think you will get the full benefit of BPU with a stock exhaust though

silvershark44
05-11-06, 18:49
Yeah thats my fear, its probably not a good idea to go BPU now winter is approaching anyway.

I think I really need to sit in a BPU supra at a meet sometime to hear what it sounds like.

Rich
05-11-06, 18:49
Very strange question, but im interested in going BPU, but I really want to keep the stock look of the car so would be keeping the standard exhaust. If I have to double decat, is this going to make the exhaust really loud and droney? Dont get me wrong I do like that sort of thing normally, but for my car I want to remain very discrete. I love modified supras, but im deliberately keeping a stock look just to be a little different, and plus I believe that unless oyu have a lot of cash to throw at it you shouldnt bother.

So how discrete can BPU be? I dont mind noise so much on the outside of the vehicle, but I dont want to hear it droning on the motorway.

:search:


might be worth getting a HKS silent exhaust to get the full benefit of BPU,dont know how loud these are though + you would lose the "stock look"

silvershark44
05-11-06, 18:57
Ive heard that HKS Silent Exhaust is far from silent though??

Isnt the name supposed to be a bit ironic?

Pig
05-11-06, 18:58
You can up the boost through a stock exhaust system and it will not be loud, infact, it will still be silent!
BPU is great, but as you say, it may be better to wait till summer!

Ian R
05-11-06, 19:01
You can up the boost through a stock exhaust system and it will not be loud, infact, it will still be silent!
BPU is great, but as you say, it may be better to wait till summer!

Says Pig with the boostlogic megaphone zorst :d

silvershark44
05-11-06, 19:02
Yeah thats sounds ok, would like to know what figures i would be getting at the fly though? I was bang on 300bhp at the fly with a shagged intercooler and fueling way way out.

Mas
05-11-06, 19:03
HKS exhausts are farely quite , the HKS silent is what you want as its the quitest after market exhaust you could get.

silvershark44
05-11-06, 19:11
ok cool, cheers all

Angarak
05-11-06, 19:21
I've recently fitted a HKS Superdrager (mk 1) and Im BPU, its quieter than my previous HKS Hypermax exhaust (both mild steel with stainless backboxes)

Think you'll only get 'scare the kids' loud when using stainless/titanium exhaust systems.

Robbo
05-11-06, 21:03
Sorry to hi jack the thread but what does BPU stand for?

:)

Rich
05-11-06, 21:06
Sorry to hi jack the thread but what does BPU stand for?

:)

basic performance upgrade

Robbo
05-11-06, 21:08
basic performance upgrade

Thanks Rich :)

Homer
05-11-06, 21:09
Think you'll only get 'scare the kids' loud when using stainless/titanium exhaust systems.

Not true, the RSR is mild steel but extremely loud.

The loudness has to do with the silencing method and number of silencers used. The HKS Silent, HKS dragger and other have a huge packed back box and secondary silence so are much quieter than those with the tiny backbox only pipes like the RSR

Angarak
05-11-06, 22:39
I [-]stand[/-] sit corrected :)

egrossi
05-11-06, 23:10
hi robbo,
I'm new and love the kit on your supra excuse my ignorance but what kit is that kit called. Love to add to mine when I get one very very soon.

Supra-Dupra
05-11-06, 23:46
hks superdragger. Just a mild rumble.

Supra-Dupra
05-11-06, 23:47
hi robbo,
I'm new and love the kit on your supra excuse my ignorance but what kit is that kit called. Love to add to mine when I get one very very soon.

Yes take your kit off and show us it in detail :D

egrossi
06-11-06, 00:02
yeah cheers supra dupra thought pc was wrecked could'nt do anything click ok ok and on and on. ironic was in ireland the other week visiting my family.

gzaerojon
06-11-06, 00:04
i have an Apexi N1 on the soop, after i went BPU it made almost no difference in sound :(


probably a good thing now as i live near a load of pensioners with an average age of 127

they don't like prodigy i found :innocent:

jot_ie
06-11-06, 00:06
I just fitted a brand new super dragger last wednesday
A nice low rumble that perks up a bit when pushed
Stainless back box, 5" tip with 90 mm piping. the piping is mild steel.
The hks silent is in fact the hks hiper or another name the hks hi power. The silent should read "silenced", you have to run with a baffle in to achieve the quieter sound.
john

Mas
06-11-06, 00:08
I have the HKS Titanium and I love the sound of it. not too loud not too quite;)

mikeyb10supra
06-11-06, 08:52
Dont think about going BPU without a free flowing exhaust, your just asking for trouble imo....its far to restrictive and the heat build up will be immense!

as others have said, if I rememer rightly, mongoose, tanabe and the HKS are your best bet for a quiter exhaust, also leave the baffle in for more silencing

Class One
06-11-06, 09:13
I have a 4" stainless Trial exhaust with 3" double decats, and it's not too loud at all (inside the car :d )

silvershark44
06-11-06, 10:30
Yeah i really dont mind what it sounds like outside the car, just as long as I cant hear it in the car. Maybe I should go for a decent HKS exhaust and look into some extensive sounds proofing / deadening to keep the noise out of the car. Just want to be as discrete as possible really, but thats going to be a huge compromise for power.

Suprasteve
06-11-06, 13:04
just buy a Blitz Nur spec and a bung.

That way you get the best of both worlds. Stick the bung in when you want to be quiet and take it out when you want to full benefit of the mods !


.....simple really.;)

Nic
06-11-06, 13:44
Another option would be to fit an Apexi Exhaust Control Valve. This is basically a valve fitted in the exhaust that allows you to quieten the exhaust when needed, via a dash mounted controller. There are 2 control options either mechanical or electronic.

http://www.apexi-usa.com/graphics/products/2511.jpg

http://www.apexi-usa.com/graphics/products/2274.jpg

silvershark44
06-11-06, 18:30
Wow Nic, i like the sound of that actually, the could be really cool! Do they actually work well ie how much difference to they make?

Faye
06-11-06, 18:39
Hmm, could be interested in the exhaust control myself. As Mr Silvershark says - how well do they actually work?

DannyW
06-11-06, 19:04
Nic, what kind of money do those go for?

Robbo
06-11-06, 22:41
hi robbo,
I'm new and love the kit on your supra excuse my ignorance but what kit is that kit called. Love to add to mine when I get one very very soon.

It's only got OEM side skirts :)

Pig
06-11-06, 23:37
Nic, prices please. looks like a poss group buy

DannyW
06-11-06, 23:39
Yep, defo up for 1 of those, it will keep the neighbours happy when i'm warming the car up in the mornings anyway.

Nic
07-11-06, 00:25
I've not heard one on a Supra, seen them on a couple of other cars and they do quieten the exhaust note a fair bit.

It is basically similar to having a baffle in the tail pipe, but with this option you can control when it is quiet :)

If there is interest in a group buy, I will see what deal I can sort out.