Last x Days Posts  1 | 3 | 7 Days  Search  Topics  Tree View  Help
  Soarer Central * Mechanical - Common * V8 mod list - expected percentage power increase * Archive through November 08, 2005 Previous Previous    Next Next  

Author Message
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 39
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:21 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Ive got a stock uzz30 v8 soarer. I plan to do these few mods over the year or so.

Just wondering what sort of % gains in rwkw or rwhp i would expect to get by doing them. Ill of corse be taking this to the dyno to find acurate results of how it is now, stock and each time i perform another mod.

1) Exhaust 2.25" to stock cats. All 5 mufflers removed and an X shaped cross over pipe. Lukey 2.25" double offset ultra flos.

2) 3rd BFI version with cold air ducting.

3) Stock ecu reset before unichip etc. Will i get any power out of making it learn to drive a bit harder?

later on (at least 6 months)

3) Headers and 2.25" dual cats to complete exhaust.

4) Uni-chip and tune.

ill be very happy with thos 4-5 mods done. Any thing else i should do?
Adam Lonergan
TryHard
Victoria
UZZ32

Posts: 109
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:25 pm, by:  Adam Lonergan (Alchemistal) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think you will find a parallel thread regarding this... also I think most people will tell you to get headers before any exhaust work.
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 41
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:32 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

headers before other exhaust work? hmmm seams more cost effective going the mufflers to the headers.... headers are the best exhaust mod so you do have a point... id rather get rid of the quite 5 mufflers first however.
Adam Lonergan
TryHard
Victoria
UZZ32

Posts: 110
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:34 pm, by:  Adam Lonergan (Alchemistal) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

The headers will mean a different exhaust setup, so the argument usually is not to spend money on something you are going to change/replace later down the track.
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 42
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:39 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

mmm thats true.

Well for now id say id be quite pleased with the exhaust done from the stock cats. Headers and high flow cats can wait a good few months until ive got the odd 600+ for them and feel the need for more power and a better exhaust note...
Darryn Dewar
Tinkerer
Gisborne
UZZ30 Soarer

Posts: 78
Reg: 09-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:40 pm, by:  Darryn Dewar (Mrphreak) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

As Adam said, do the headers first, or wait and do the lot at once (Which will work out cheaper in the long run). And why bother putting cats back in??
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 43
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:56 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Darryn Dewar wrote on Monday, November 07, 2005 - 07:40 pm:

And why bother putting cats back in??




To filter some of the poisonous gases out. I heard they are require to be fitted.. am i wrong?
Darryn Dewar
Tinkerer
Gisborne
UZZ30 Soarer

Posts: 79
Reg: 09-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 07:59 pm, by:  Darryn Dewar (Mrphreak) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

You live in New Zealand, we don't care about the environment

Afaik, the Aussies have to have them fitted
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 44
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 08:01 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think ill try how ive planned the exhaust in a month or so and if its not want and drones etc ill get the headers as fast as i can and just pay the extra cost fit them in with the new exhaust... Money is not that much of a problem
Morgan Cross
DieHard
Victoria
Soarer TT

Posts: 628
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 08:03 pm, by:  Morgan Cross (Morgan) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mike, with all those mods I think you'd be looking at about 170-170rwkw.

Which isn't overly bad, considering they put out abotu 120-125rwkw stock.
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 46
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 09:00 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

id be more than happy with 170 rwkw!

Yeah, it's probably got around 130rwkw stock, which i find is good power.. Ill get it dynoed in December, its been well maintained and has 122,000kms so it should make good power... have to wait and see.
Avin Luther
TryHard
vic
Soarer V8 uzz31

Posts: 247
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, November 07, 2005 - 09:47 pm, by:  Avin Luther (Lex_luther) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i would leave the cats out if local regulations permit, other wise put in larger Hiflow cats.
Ans as suggested above, do the headers at the same time as the rest of the system! It is a big job and makes the rest seam simple. You will also save Lots of money, and it will allow the exhaust shop to build a proper system in one go.
I got 148rwkw with headers, hi flow cats, twin 2.25 and BFI.
~20kw gain for about $1800
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8

Posts: 2342
Reg: 11-2004

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: 
Votes: 2 (Vote!)

Tuesday, November 08, 2005 - 01:40 am, by:  Peter Nitschke (Pen) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Before it gets any further embedded in folklore, I would like to kill the newly created myth that has sprung up in the last week or two, that modifying the exhaust on a V8 without fitting headers is likely to cause droning.

I have been in a few cat-back modified exhaust V8's and none of them droned. Conversely I have been in a V8 with headers that droned quite a lot.

Droning is a function of the entire exhaust, choice of mufflers, amount of vibration transmitted to the cabin via mounts not hanging freely etc. Not just whether it has headers or not.

So can we kill this myth right now please.
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)

Posts: 659
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 07:24 am, by:  David Vaughan (Davidv) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

A 30rwkw gain is available without fitting headers (and no drone, as Peter says). In fact, my exhaust retains the original resonator as well as the cats and exhaust manifold. Cost for that (including Unichip) was $1950 or $65/kw compared with $90/kw in Avin's example.

So, replacing headers and cats is not as cost effective for power gain as the other three changes (BFI, Unichip, muffler/strangler replacement) but if you want the extra power headers/cats provide, then it is cheaper to do them before the rest of the exhaust.
Miles Baker
TryHard
Vic
V8

Posts: 169
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 08:56 am, by:  Miles Baker (Milesb) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

removing cats is worth a couple of kw tops. do the environment a favour - don't be an ass for 2kw. unburnt hydrocarbons are nasty. plus you won't have a rear bumper covered in filthy black crap all the time.
Charlie Hooper
TryHard
Queensland
V8 Limited Soarer

Posts: 119
Reg: 10-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 10:21 am, by:  Charlie Hooper (Charlie) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Adam Lonergan wrote on Monday, November 07, 2005 - 07:34 pm:

The headers will mean a different exhaust setup, so the argument usually is not to spend money on something you are going to change/replace later down the track.




I wish someone told me this/I thought of this before I got the exhaust done haha .. I'm going to have to get something I spent almost a grand on chopped up to fit the headers on now..
Dan McColl
TryHard
Victoria
UZZ32 V8 Soarer #183

Posts: 323
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 10:53 am, by:  Dan McColl (Hoon) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Interestingly enough my dads SS ute gained 3 kw from fitting hi flow cats over straight through pipes.
Avin Luther
TryHard
vic
Soarer V8 uzz31

Posts: 258
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 01:45 pm, by:  Avin Luther (Lex_luther) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


David Vaughan wrote on Tuesday, November 08, 2005 - 07:24 am:

Cost for that (including Unichip) was $1950 or $65/kw compared with $90/kw in Avin's example.




David, i hadnt had mine Dyno'd before the exhaust so this is only a rough estimate based on stock figures of around 130.
I dont think you can break it down into KW for dollar!
Also when looking at an upgrade path i did headers in the hope of fitting a chip one day, and felt this would optimise any gains possible.
It also sounds AWESOME.

ALso most of the price in an exhaust willbe on the choice of mufflers and cats, and this can be more up to style than performance.
Mike Beck
Tinkerer
New Zealand
Soarer uzz30 4.0GT

Posts: 52
Reg: 11-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 01:53 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

mmm well ill get the BFI and Cat back exhaust done some time around christmas have some dynos done to find the power its making, should be great fun .

The headers and unchip can wait a few months. I find reasonably fast stock with a guess of 130rwkw, i could only imagine 170rwkw+ with headers etc, it would be superb..
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)

Posts: 661
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 08, 2005 - 02:46 pm, by:  David Vaughan (Davidv) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Avin, I had no intention to cause any offence so please do not worry about that. Your base power estimate accords with mine. Your initial power would need to have been down around 123rwkw to get the same gain per dollar.
I think looking at what you get for dollar spent is perfectly legitimate. in your case (and others) fitting the headers makes sense because of the total gains you will eventually seek whereas I am deliberately capping possible gain. So, my choice (no headers) limits total gain but at a higher payoff than any alternative limited path. Unlimited paths are a different matter. Hope that is clear.

Back on ALSC earlier this year I did a dollars per kilowatt comparison of the various changes. The main points were that doing anything before a BFI is profligate, while a Unichip has a good payoff ($90-$100/kw plus low end torque benefits) if you can afford the capital for the chip and the running cost of locking into Premium fuel. It also showed that if you are planning either headers/cats or cat-back exhaust (one but not both) then the rear exhaust has the better payoff but if you will ever do both then the headers come first, this being the point I am making in the previous post.

A supercharger costs more per kilowatt gained than any of the other changes and hence came last in my list even though it provides the biggest single gain. As a side point it needs some of the other breathing changes to be most effective anyway.

  Administration Administration      Log Out Log Out Previous Previous      Next Next