Rb25de (supercharged) Project

[Rolls]

Could you do a video of a dry by and perhaps in the cabin? I'd love to hear how loud the car is and perhaps even see how it revs.

[r33_racer]

Yeh I cant see the point in spending so much on a high end ecu when something lesser will do the job fine. This is only a weekend/fun car.

Ill look at the ecu options abit later on anyway. I got enough little things to sort out at the moment.

I got around to pressure testing the piping system. I think ive found out why the boost was not holding in a flat lined state. I have discovered in total 5 boost leaks lol! Two from intercooler hose joints, one just before the throttle body and the other at the first joint after the discharge port. Those two are both quite substantial, though easily fixed. There is one coming from the plenum, the block off plate I made to bolt inplace of the idle control valve, I once again used 3J aviation gasket paste there and it appears to have blown out, so I will need to threebond that shit on. The last two leaks are coming from the bypass valve. There is one small leak coming from around the throttle shaft where there is a small gap eachside of the blade right where the bearings are pressed in. You can blow through it with your own breathe, so that air is leaking and being returned back into the intake. That may be acceptable, I would have thought not but I need to find out for sure. Now the last leak is coming from the actuator housing, where the arm comes out it also leaks boost when its shut. It absolutely pisses out from around there. Im guessing the diaphram is damaged or something as im sure its not supposed to leak that much. Either I got a dodgy unit or they are meant to be like that.

Pretty well all of this could have been avoided had I gone to the effort to pressure test it all like I had planned before the tuning. When tired, I just pulled the "ahh she be right mate" it cant be too bad lol. Well fark was I wrong there.

So im curious to know just how better things might get with all the leaks fixed up, including the bypass valve.

[r33_racer]

After some more research last night, I discovered that plumb back bov's apparently work pretty well as bypass valves! Will look at giving one a try to replace my current one. Hopefully it works out!

Also found some info on sound deadening. Some sort of wrap that you put around the intercooler pipes and it keeps the noise in. Also found something about a Helmholtz resonator. Some air canister that links from the outlet of the supercharger and it cancels out noise by holding the air...Will have to look into that abit more if it will help!

[zebra]

  r33_racer said:

After some more research last night, I discovered that plumb back bov's apparently work pretty well as bypass valves! Will look at giving one a try to replace my current one. Hopefully it works out!

Also found some info on sound deadening. Some sort of wrap that you put around the intercooler pipes and it keeps the noise in. Also found something about a Helmholtz resonator. Some air canister that links from the outlet of the supercharger and it cancels out noise by holding the air...Will have to look into that abit more if it will help!

most of the CAPA Vortech supercharger kits run the ole plastic Bosche valve, you would prob need 2 with a positive displacement blower though, KKR do an alloy version of it too, and it comes with 3 different springs.

both are 25mm inlet and outlet. hence my suggestion of using 2 of the buggers.

[r33_racer]

Yeh but the one I have is a 38mm ID one. So i need something similiar. Preferably one that will adapt easily to where it was mounted.

[r33_racer]

So I fixed the two hose leaks. Got some better clamps and aligned the piping better. Also fixed the leak from the inlet manifold. The standard gasket that sits under the idle control valve wasnt sealing properly with the block off plate over it. Used some threebond instead. I thought I had put 3J on it, but turns out I just re used the factory gasket. Eitherway its not leaking anymore However I have discovered a new leak in the throttle body. Its leaking past the shaft and out around the tps drive. Hopefully I can get some sort of O ring to seal around the shaft and under the drive adaptor I made.

So many leaks....Its no suprise the power was down and it wouldnt hold stable boost!

[Proximity Motorsport]

looking good mate, keen to see a final result.

[r33_racer]

I changed the bypass valve to a turbosmart 38mm plumb back bov last night and cut the spring down so it works....Its alot more progressive now. The driveability has increased a shit load! But I cut the spring abit too much and its bleeding boost off up high lol. Can only achieve 1.2 bar now Hopefully some shims under the spring will help that issue.

Still waiting on my cooling mist WMI kit to come from the states.

[Rolls]

Considered hooking a boost controller up to the BOV? You could probably get fairly accurate boost control with it.

[r33_racer]

Funny you should mention that, I actually tried hooking up the bleed valve to the old bypass valve and it didnt make much difference. I may try hooking it upto the bov and see what it does. I still need to shim it. It only needs just enough so it stays closed under full boost.

If none of this works as well as I want, then Ill just have to hook up my old wastegate and plumb it up as I was originally advised by StockyMcstock who successfully twincharged his vl 3-4 years ago. Atleast I know his method will work. In hindsight I should have just taken his advice! I seem to naturally do things the hardway!

[FineLine]

I went and had a look at this on Sunday....WOW!

The amount of fabrication work involved is unbelievable, Well done Mike.

At idle it sounds like a rutting red stag but at full noise it sounds like a chainsaw on rhoids..."Its stock officer"

[r33_racer]

Thanks Noel. Am I still good to tag along on Sunday?

Just a small update, Im finally in the process of fitting up the power steering pump. I have the pump mounted, just need to plumb up the lines and do the wiring! Then fingers crossed she works and I have some proper power steering again I will get some pictures of all this and try to document it well as I know there are people who have been curious about setting up a EHPS system in a skyline.

[FineLine]

  r33_racer said:

Thanks Noel. Am I still good to tag along on Sunday?

Just a small update, Im finally in the process of fitting up the power steering pump. I have the pump mounted, just need to plumb up the lines and do the wiring! Then fingers crossed she works and I have some proper power steering again I will get some pictures of all this and try to document it well as I know there are people who have been curious about setting up a EHPS system in a skyline.

Hell yeah mike. Meetup is at aspley hypermarket at 8 a.m.

[r33_racer]

Saweeeet! Sunday is going to be awesome! So long as I dont get pulled up lol....

Also Noel do you have a contact number for this gonzo character so I may try and get one of these uber resonators please?

[FineLine]

  r33_racer said:

Saweeeet! Sunday is going to be awesome! So long as I dont get pulled up lol....

Also Noel do you have a contact number for this gonzo character so I may try and get one of these uber resonators please?

not yet but I'm working on it.

[TiTAN]

uber resonators?

exhaust way too loud?

[r33_racer]

Cheers!

Yeh when driving and you give it a boot the exhaust is quite loud. Because the charger induction noise is so damn loud you cant tell just how rowdy the exhaust is...

[TiTAN]

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.

[FineLine]

  TiTAN said:

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.

I think mike is takin the piss Titan. No way on earth can you hear a top fuel exhaust over the banshee wails of that supercharger.

[r33_racer]

I should see how many dbs it actually is to start with. But with those two mufflers I have now, they dont seem to be enough. I was thinking of using the muffler off the race car which is quite good, but it is huge, possibly similiar in size to what you are describing. Bu l ike you said, it is NA now and its fricken loud whilst cruising and it just gets exponentially louder as the charger starts forcing more and more air through it.

My main priority is to try and quiten down the induction noise because it is just rediculous!

I still owe a few videos of it going. I havent gotten around to it yet. Hopefully on the weekend