| Author |
 Topic  |
|
| |
Current Topic Rating:  | Join the Forum to Rate this Topic at: www.VNCommodore.com Support Forums
|
|
|
par10
P Plater
78 Posts
 |
 Posted - 19 Feb 2007 : 11:36:21 AM
|
Hey all,
My girlfirends b'day is coming up in about a month snd she really wants me to get her a quad tb setup for her 355 vn ss. At the moment she is running a Harrop 355 crank, VL Group A customised twin tb setup with 71mm tb's, ACL forged pistons, custom built heads, CAI, Gonzo extractors and twin 2 1/2 system right through. Custom built 5 speed and KAAS 4.11 LSD. Dyno'd 271kwrw, 12.6 1/4 mile. Anyway i agreed to getting her a new setup, my question is where is the best place to go for it? Funds aren't exactly a problem...
|
Edited by - par10 on 19 Feb 2007 11:38:49 AM |
|
Report to Moderator |
|
|
trizo
Forum Moderator
3091 Posts
|
Posted - 19 Feb 2007 : 11:55:58 AM
|
| m8 were about in oz are you? My advice would be to look on the net 4 performance shops and the product u desire... there is heaps of info and most of the time it gives you all the info on the part u want ... and the best part with doing it this way is that u can e-mail the dealr and have them hold the part ... |
3 can keep a secret if 2 are dead |
Report to Moderator  |
|
|
trizo
Forum Moderator
3091 Posts
|
Posted - 19 Feb 2007 : 11:57:35 AM
|
ps m8 nice ride ... your girl has taste!! ;)
TRIZO |
3 can keep a secret if 2 are dead |
| Report to Moderator |
|
|
par10
P Plater
78 Posts
|
Posted - 19 Feb 2007 : 12:14:23 PM
|
I know she has good tastes, puts my cars to shame Quite a scary ride too, She had it lock - lock on the freeway onramp the other day with a full car, all under control though I'm in Brissy, so there is a reasonable amount of places around. I am more than capable of fitting and tuning it all myself, i've done a lot of work on the car already. Just curious mainly on what people think is the best way to go. By the way, she is looking at maximum possible power. Upwards of 300kwrw will make her happy. |
| Report to Moderator |
|
|
mouce
National Driver
1525 Posts
|
Posted - 20 Feb 2007 : 2:25:05 PM
|
Why not look at tuned inlet trumpets each with their own throttle plate? I've seen it done on a V6, surely you could manage it on the V8.
Since money isn't really an issue (lucky you), get it custom made. Shop around, find a good performance shop who can get gear made to order and get it fabricated to suit you.
|
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
| Report to Moderator |
|
|
SWEET
Fully Licenced
600 Posts
 |
Posted - 20 Feb 2007 : 6:35:28 PM
|
| darn i dont really know wat all that means in that car but i do have a fair idea and darn ur g/f is hardcore. guess she likes the power. hopefu;;y ill get to that stage 1 day(1year) lol anyways b4dn |
| Report to Moderator |
|
|
par10
P Plater
78 Posts
|
Posted - 20 Feb 2007 : 8:51:03 PM
|
| I have considered individual throttle bodies for the car, but would most likely bee too expensive for her to run, as it is her daily driver... Thats why i thought the quad tb idea would be sufficient until i try to talk her out of using it as her daily driver (she is determined to keep it this way!) If i succeed i might look at forced induction for her, since she is in love with supercharged vehicles. Besides she only wants the car running 11's on street tires at the moment |
| Report to Moderator |
|
|
mouce
National Driver
1525 Posts
|
Posted - 20 Feb 2007 : 10:14:05 PM
|
Since you're running it as a n/a engine, moving to a quad t/b setup probably isn't going to gain you any more power. You'll get a bit more throttle response at low throttle percentages, but no more power in the top end.
Twins would be enough, even for moderate to high boost applications. If you were to go nuts and raise the boost well above 25psi then you MIGHT see benefits from the quads.
With the mods that you've got, I'd look at a really nice supercharger setup and full custom dyno tune afterwards. That would be much more rewarding than a quad throat setup. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
| Report to Moderator |
|
|
lolo
Fully Licenced
503 Posts
|
Posted - 20 Feb 2007 : 10:25:31 PM
|
| mate your girl does have taste but the car sounds pretty much as tough as it will get in n/a form. I actually think the quads will be more of a power restrictor... someone explained that to me once upon a time and their logic sounded right lol. Turbo would increase the power to around 400kw. Im doing a turbo six and a the conservative power estimate on relatively mild boost (18 psi) is 360rwkw.. 25 psi is good for 440rwkw ona a six so imagine what a worked 8 with turbo will do. mind you there will need to be some mullah spent on strengthening the engine, low comp etc... however she does have acl pistons doesnt she??? thats a good starting point |
Marcus Rogulic R.I.P (1980-2007)
"The Good Die Young" |
| Report to Moderator |
|
|
par10
P Plater
78 Posts
|
Posted - 21 Feb 2007 : 6:33:55 PM
|
I never would've expected quads to restrict the power. I spoke to a good mate after i first considered it, and he recommended it aswell. I figured he'd be right, because he owns a 331ci VP Clubby and is doing an agressive turbo build on the V6, plus he has always been into these types of cars. The bottom end is about as strong as it can be built, easily good for 6-700hp at the motor, heads aswell.
I might end up going the supercharger route for her birthday, as long as i can get it tuned nicely while keeping it safe and relatively sedate for daily road use... |
| Report to Moderator |
|
|
mouce
National Driver
1525 Posts
|
Posted - 21 Feb 2007 : 6:58:03 PM
|
Hmmm...you're girl wants a 300+rwkw car that is 'relatively sedate'? You know that it isn't going to happen like that.
Most people figure that going from one to two t/b's makes a big difference so going to 4 would be even better still. It doesn't work like that all the time. Having two well setup t/b's on there, being force fed by a well set up supercharger would be a WAY better path to go down.
Plus you get that sexy sound that only comes from a supercharger.
|
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
| Report to Moderator |
|
|
par10
P Plater
78 Posts
|
Posted - 21 Feb 2007 : 9:48:46 PM
|
| No no no... I want the car to be relatively sedate (to a certain extent), she doesn't. This sort of hp in a rwd manual on wet roads isn't entirely safe, it actually has me scared at times. The Pirelli's don't even work too well for my liking. I think you're right mouce, a supercharger seems to be the best way to go. Besides the power figures obtainable from it is sure to keep her happy for atleast a few more months. Not too bad a present for a 21st. |
| Report to Moderator |
|
|
mouce
National Driver
1525 Posts
|
Posted - 21 Feb 2007 : 10:52:55 PM
|
That sort of power in a RWD manual is safer than in a RWD auto.
But let's look at it SERIOUSLY, If you want something that's safe in the wet, you're not going to own a VN. Even in stock trim they are deadly in the wet.
That said, what size are the tyres? I'm guessing that they are a little larger than the 185/75 14 tyres that came from the factory.
One of the biggest advantages of the supercharger over the turbocharger is that there's no lag. So the increase in torque is there as soon as you hit the throttle. Just means you can get off the line just a little faster.
With all that work on the engine, how much fuel does it go through? |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
| Report to Moderator |
|
|
par10
P Plater
78 Posts
|
Posted - 25 Feb 2007 : 6:19:46 PM
|
Its running 235/55 R16's on the rear, with 225/55 R16's on the front all on VP SV5000 rims. It gets fatter tyres for the drag strip.
Fuel usage seriously depends on how its driven. Most of the time we TRY to drive normally... 150-200k's out of a tank i guess you can call average. But once again, highway and city driving makes a HUGE difference. Thats normally a weeks worth of fuel. She does about 70k's to & from work each week, and the rest is going elsewhere. |
| Report to Moderator |
|
|
mouce
National Driver
1525 Posts
|
Posted - 27 Feb 2007 : 6:33:38 PM
|
200km out of a tank??? OUCH!!! That's working out to be somewhere up around 30-40L/100km. That can't be right.
Hell...the V8 supercars use about 60L/100km.
Unless that thing needs a tune badly you should be doing much better than that. I wouldn't expect it to be any worse than 20-25L/100km. You should be able do do better than what you are. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
| Report to Moderator |
|
|
par10
P Plater
78 Posts
|
Posted - 27 Feb 2007 : 8:26:45 PM
|
Yes, i'll admit it isn't the best fuel usage ever... 95% of the driving is done in heavy traffic with the a/c on (yes, i kept it hooked up). It has overly large injectors for the engine, which doesn't help. But the weird thing is on the highway fuel usage is cut pretty well in half! I've tuned it both myself and by professionals and can't really do too much better, it has me stumpted... It will certainly be getting looked at with the new supercharger on it. Build starts next week Once its all done and dyno'd i will let you guys know what sort of figures i end up with. |
| Report to Moderator |
|
|
lolo
Fully Licenced
503 Posts
|
Posted - 28 Feb 2007 : 4:57:46 PM
|
| hey hey back up lol turbo lag is a thing of the past... or a common problem with front mount truck intercoolers. How bout coming onto boost between 1000 and 1500 rpm with a water/methanol setup |
Marcus Rogulic R.I.P (1980-2007)
"The Good Die Young" |
| Report to Moderator |
|
| |
Topic |
|
Topic Locked
