Rb25de (supercharged) Project

[r33_racer]

Damn banshees are going to get my car put through the pits

[Rolls]

Would it be possible to set up some sort of clutching system so it slips slightly until you get right on the throttle making it quieter?

All the supercharged v8s I hear only tend to really whine when full throttle.

Edited August 5, 2010 by Rolls

[Duncan]

if you want to quieten down the zorst a little you should consider putting a turbo on it

[r33_racer]

Rolls I dont think I could incorporate that sort of system unfortunately. The noise is abit different to that on a regular supercharged v8. Because their unit is mounted straight onto the inlet manifold the thickness of the ally dampens the noise from the outlet. But they usually also have an airbox that the intake sucks from unless its old school with carby on top with bug catchers through the bonnet. But most of those use roots blowers which are a little quieter then a twin screw as they dont internally compress. Plus I believe their whine is from the actual gears meshing not the pumping noises of the unit itself.

At idle and through most of the rev range the induction noise is really loud and then it gets overpowered by the pulsing outlet noise from the charger which is fine at higher rpm. Its just the idle noise I want to dull down.

After a video or two you will know what I mean.

Lol nice one Duncan. I have and I dont want to have to re do anything, not yet anyway. Lol if I do have to re do anything then I will consider twin charging it. Maybe in years to come. Build a tough RB30, another custom exhaust manifold to mount something like a gt45 or something around that to try and have a super responsive 1000hp.....

[XRATED]

+2 for adding a turbo to quiet the whole shbang down... induction and exhuaust sound!

[MBS206]

i know for a fact that a nice big 16x11x8" muffler will fit on the back of an R33, combined with the decent sized mid muffler you have now that should take a lot of the noise out, i know on a turbo skyline one of them mufflers and a hotdog will get a 3" exhaust to legal levels. (as mine is a 16x11x6 + hotdog mid muffler and reads 89db @ 4000, 92db @ idle)

Being NA it will be a bit harder to make quiet but you can always go a custom huge muffler if off the shelf sizes dont take enough out.

9" will fit also.

I'm running a cat, followed by a 5" mid muffler thats 550 mm long (Able to go out to 950MM from memory we measured), followed by a 7" Body, 950mm long, (These are both "cannon" style but custom made with fibre glass packing)

The rear one we measured we can push out to around 9/10" round without an issue.

There is also room to fit a 5" body stainless packed front muffler before the cat (Like some rotary guys do)

We looked at if need be on my system running the stainless muffler as part of the dump pipe.

There is so much room under a skyline for mufflers, it's awesome.

[drtytwo]

wow this is unique!!

[zebra]

Cough*

http://cgi.ebay.com/ebaymotors/TWINCAM-24-...sQ5fAccessories

[NISMØ]

Updates????????? moar video

[r33_racer]

Lol that badge is awesome!

No new videos or updates yet sorry. Ive been busy working on the race car and my car is on hold at the moment until I work out what I want to do. Im heavily considering twin charging it....Simply for noise reduction and the new challenge.

Ive got a Mr turbo billet turbo at home which we had for the race car at one stage. Its a 900hp T76 somethingarather. So that coupled with the supercharger would make for something interesting surely!

The internal debate in my head is still going.....

[Rolls]

I thought you had no room left? Or would a lowmount still fit?

[r33_racer]

Yeh it would have to be low mounted and further back then normal. I havent really done any proper measuring or checking yet. Just looked at it roughly by eye.

If I did do this it means, new custom exhaust manifold, new 4" exhaust, water/oil lines, moving or remaking the catch can, turbo intake, new turbo outlet to charger intake and plumbing up the meth injection system. Plus I gotta redo the supercharger drive system. Im pretty sure the belt is slipping a shit load. Im thinking change to gilmer drive instead of ribbed.

So thats a couple small things to consider!

[TiTAN]

wont the glimmer drive add to the intake noise essentially?

[r33_racer]

Yeh it will no doubt add some whine. But aside from going to 8pk belt over the 6pk I have now, there arent too many other belt types and I dont have much room left to go further out for wider belts.

[Mister25t]

End up doing anything else with this?

Still interested

[XRATED]

Whats the go joe?

I'd love to see you get the best out of the sc set up before twin charging... After all the work that's gone into it, it would be a shame to not get the best out of it and see where it goes.

CHeers

Justin

[r33_racer]

Unfortunately nothing has progressed yet. Its been on hold while we are working on the race car. We're not allowed to work on more then one car at a time in the shed. Too easy to get bits n pieces mixed up and there isnt enough room.

I was considering trying to fix up the drive only and see where it goes, however the biggest problem at the moment is still the noise. My honest opinion is that twincharging it will cure that problem, atleast better then somekind of heavy duty airbox and another muffler/resonator or two. I really dont want to pull it all off and then have to do it all again.

[TiTAN]

the problem with the exhaust noise, is that you are using tiny mufflers/resonators. whack something huge at the back 16x12x8 etc thats an easy fix and a custom muffler from an exhaust shop should be all of ~$350.

[r33_racer]

Yeh you are right about the exhaust. I do have access to a big one that is probably around that size which is currently on the race car. But its the inlet noise thats number 1 on the list and what im mainly focused on.

The joys of modifications!

[XRATED]

Could you 'mid' mount the turbo in a semi-permanent position to test it out? eg mount the turbo under the car, so you don't have to scrap the exhaust manifold.

Keep on truckin..

J.