Rb25de (supercharged) Project

[DVS JEZ]

To help muffle the intake noise u could try running a resonator between the filter and the charger. Like alot of factory cars these days

[r33_racer]

I did look at a helmholtz resonator setup. But a lack of room stopped that idea unfortunately

[AbsentNamed]

Hey mate,

Have you managed to make any progress on this yet?

Cheers

Aaron

[r33_racer]

Update time.

So over the last two weeks ive rebuilt the motor. I got some new rings as my old ones were shot from an overheat I had before I started the supercharger project, it was a failed waterpump that caused it. Got some sweet new conrods from Spool (Brad) and a collar and pump. Thanks Brad. He is a top bloke and has great affordable parts. Also got some second hand valve springs out of the race car head which were better then my factory springs.

The last two weeks have pretty much consisted of pulling the motor out and stripping it to get the crank polished and collar fitted. Drilling and tapping the main oil gallery in the block to suit some bspt grubscrews front and back, drilling and tapping the crank and cleaning all the crud out of it, honing the bores in the block so the rings have a fresh cross hatch to bed in, gapping the new rings, checking main and big end clearances, balancing the conrods and pistons and then assembling it all. I stripped the head and cleaned it all out and then fitted the new valve springs and put it all back together except camshafts. I want to get a set of kelfords or camtech cams while its apart. But I gotta wait until they get off holidays. Then I just need to modify this sump and I can fully seal it all up and chuck it back in so I can continue working on the twincharging stage.

However while its out ive been dummy fitting the turbo and I got the flange supported roughly where I want it with the turbo bolted up to see how its going to all fit and work. Its looking pretty promising at the moment. So far so good!

Anyway here are some photos of everything so far. Note that I did write a much much longer post about everything in a lot of detail but I accidentally hit back on the mouse and it all got wiped. Its too late for me to go writing it all again so this is the shortened version. Hopefully the picures will explain it all better.

[FineLine]

Starts taking bets on how long it will take before this one is gutted and caged too.

[r33_racer]

lol I would like to have my own race car that is purely of my own ideas and none of dads. As im sure you know he doesnt let me do many if any of the crazy ideas I come up with.

How did you like the new setup with the race car Noel? Doesnt the mechanical fuel pump look trick? Lol can thank the gibson motorsport GTRs at lakeside that day for that one! I tidied up the boot and fuel system. Remade the tank in stainless which came out pretty good, lol dont like the surge tank though, its made of 0.9mm thick s.s and that is a bastard to weld. But the boot looks a whole lot nicer now with fewers pumps and a much nicer tank!

[FineLine]

lol I would like to have my own race car that is purely of my own ideas and none of dads. As im sure you know he doesnt let me do many if any of the crazy ideas I come up with.

How did you like the new setup with the race car Noel? Doesnt the mechanical fuel pump look trick? Lol can thank the gibson motorsport GTRs at lakeside that day for that one! I tidied up the boot and fuel system. Remade the tank in stainless which came out pretty good, lol dont like the surge tank though, its made of 0.9mm thick s.s and that is a bastard to weld. But the boot looks a whole lot nicer now with fewers pumps and a much nicer tank!

Very impressive Mike. the fit and finish is equal to anything available from any where in the world.

You guys are really getting a handle on the cnc shit for sure. Now all we have to do is transform these cars from bloody shed ornaments to actual track cars.

[r33_racer]

lol you are not wrong! Its quite depressing spending more time working on the cars then actually racing them! We will all get there though!

[Rolls]

had any more ideas about suppressing the noise the charger makes?

[r33_racer]

Yeh im hoping the compressor housing and wheel will muffle the noise as the charger sucks through it.

I also got to machine up another pulley to slow the charger down which im hoping will help reduce its noise as it wont be spinning as fast. trying to drop it down to about 8000-9000rpm from the current 14000rpm.

[r33_racer]

Spent half the day making the merge collector. It came out pretty good. I made it with a 25 degree merge angle to help keep it all low and spread out so it should make it easier to plumb up with the little room I have between the flange and bonnet.

The rest of the day I spent nutting out the sump mods. Got a mud map drawn up and found a strip of mild steel sheet which should be big enough to do the job. Only got the pan cut off ready to be cleaned up to take the new extension after I fabricate it.

Time to go home and get wasted! Happy New Years peoples!

[MBS206]

I wish I had a workshop and all of the tools you have at your disposal...

Can't wait to see how it goes twin charged, although, if you're slowing down the compressor, won't you be removing the available boost at lower RPM as it won't be forcing as much air in at that point in time?

[Rolls]

what turbo is that? looks gigantic

[r33_racer]

Yeh I am lucky to have access to all the machinery and tools at work. It certainly makes doing these kind of custom projects easier.

I dont know if ill really be losing that much boost down low, as the belt was slipping before and made x amount of boost, im guessing by turning it slower and having less load on the belt without it slipping I may just make similar boost. But I wont need to make that much out of it anyway since it will multiply whatever the turbo adds into the mix. Having the superchargers intake vacuum helping spool the turbo plus the added exhaust gases from the down load boost will also help spool the turbo I dont think there will be much to worry about in terms of losing down low power.

Rolls its a Mr Turbo T76 I think. He tells me its rated at about 850-900hp.

[r33_racer]

I finished the sump this afternoon and got the motor sealed up finally.

With the new extension which has some basic baffling in it, the sumps rough oil capacity is now about 6.5L

[Adriano]

What pressure ratio on the blower. I would have thought reducing the blower speed by that much would have resulted in it running no boost?

Edited January 2, 2011 by Adriano

[r33_racer]

From memory i think its a 1.4 PR.

I was running it at its max rpm before. Only dropping it a couple thousand rpm. They only take about 1500rpm to make positive pressure, so I would think they can make some boost at about 10,000rpm. Which is about as slow as I can get it after seeing how small a pulley I can fit on the drive. I dont think I will hit the 8000-9000rpm I was aiming for.

I guess I will find out when its running just what boost it develops. Just gotta disconnect the turbo from the intake and give it a rev.

[r33_racer]

Got the motor in today and partially hooked up. Fiddled with the turbo fitment and got it pretty good.

Its starting to get interesting!

[XRATED]

You sir.... are a legend!

[r33_racer]

Why thank you Justin.

Hopefully it all pans out nicely with little drama.