DennisRB30

It's interesting to note that the RB30 has DOUBLE the power all the way up to 4000 RPM, considerably more from 4000 to 6000 and the power levels are about equal up to 6400. After that it is down on power compared to the RB25 but only by a tiny bit.

Here it is using 38 rpm per km. That would mean that a R33 GTSt does 3800rpm at 100km/h in 4th. That seems a bit high to me but it could be right. I know my R31 has taller gearing but it does around 3800rpm at 100km/h in THIRD. 4th comes in a 3000rpm at 100. That seems like a huge difference. It won't be hard for one you to check it out to make sure. Just look at the tacho when you are doing 100 in 4th gear.

Bump "I would realy like to see that dyno chart referenced with RPM. I just need one of you to to look at the RPM when you are doing 100km/h in 4th gear (I assume raist has a manual with standard diff gears). If someone checks it out fo me I will modify the chart to include RPM and post it up."

I think they would be fine on a RB30DETT.

I would realy like to see that dyno chart referenced with RPM. I just need one of you to to look at the RPM when you are doing 100km/h in 4th gear (I assume raist has a manual with standard diff gears). If someone checks it out fo me I will modify the chart to include RPM and post it up. Raist: What other mods have you done to get the 240 KW?

Ahh, but it's only 2.5 litres.... RB30 bottom end...

RB30ET pistons will result in a CR lower than, 7.8:1

That is a killer power curve. Notice the extended power curve of the 3L. It has a broad rev range where it makes peak power. The 2.5L just sort of peaks to its maximum power for bit after a large low power dip.

I saw a article in zoom where they had a worked RB26 with cams and huge turbos etc, they then changed over to a RB30 bottom end. Thats all they did, plus a re tune. They left all the other hardware in place. So it is a good scientific example because the only variable that changed was the bottom end. The engine did not just get some more bottom end grunt. It got more bottom end and shit loads more max power as well, all at the same boost levels. So engine analyzer programs aside, in real terms the RB30 conversion will shit on the smaller bottom end in power and torque. Sure, it won't rev to 10,000 RPM but it won't need to becuse it will out power the smaller engine at much lower revs.

LOL

Have you read all the info in my link and gone to all the links in that?

"A fool and their money are easily parted"

Huh? They come with a 4" turbo back exhaust?

The R34 does look tough. I would take one over a 2 door.

It is possible to find nice R33 4 doors cheap. I had access to 2 neat Grey 4 door autos with low km's. The were both around 11.5K. I nearly got one but decided I better buy a house before they go up in price so much that I can't afford one at all. My brother ended up with one with 50000 km's and immaculate condition besides one barely noticeable key scratch. What do R34 4 doors go for? Similar to a chaser?

That and uniqueness. 25K is a fair bit extra to pay for interior space and extra dash knobs though... I still wan't one anyway though

They are a fkn awesome car but I couldn't justify 36K for one when it's possible to find a neat low km auto R33 4 door for 11K... Spend half the difference on the R33 and it will shit on the stock chaser in every way.

I WANT I WANT I WANT

I doubt it will help much alone. An exhaust and IC upgrade would help you most there...

I wan't one bad!

I standard manual chaser will flog a standard manual R33 according to the specs I read in high performance imports (i'm not sure about R34s). They easily crack 13's when stock. The twin turbo 1JZ is an absolute ball tearer. They are a fair bit lighter than a soarer even with the extra 2 doors. Apparenty some importer is staring to get heaps of them now.

"does it bring on boost earlier" No expert can prove that they won't bring on boost earlier for the simple reason that they do! OK, before anyone gets all emotional, they can never do as good of a gob as a EBC but they WILL help. Read this, It is explained how bleed valves do it. http://www.skylinesaustralia.com/forums/sh...ght=bleed+valve If your going to muck around with bleed valve systems this is a good thread to read as well. http://www.skylinesaustralia.com/forums/sh...ght=bleed+valve

I think you will have some probs closing the bonnet as the RB30 block is taller than a RB25. I remeber someone on another forum seeking info on how to close the bonnet of his silvia with a RB25, I would only assume that it would be even harder to close with a RB30DETT, but I'm sure its nothing some well thought out mounts wouldn't fix.

By the sounds of it you basically agree with me then (?) You no longer think its a good idea to get rid of the line to the plenum? Just a few things though. "PCV is there to stop blow by pressurising the crank case." The two rocker cover outlets alone would stop this as any pressure could easily escape through them. "All of this (crap inside the cooler) would be from when driving on boost, as when not on boost the gases plumb directly into the plenum." True, but only when you leave the PCV system intact like how I discribe, otherwise the crap will go through the cooler at all times (albeit filtered with a catch can) Look at brownies last drwing or my drawings, the PCV system is still there AND it still filters the gasses that go into the plenum! (the only differance between mine and his, is that mine uses active crankcase scavenging) In either of our systems you get the benefits of filtering the gasses at ALL times AND you have the benefit of the gasses only going through the cooler sometimes. Surely thats a good thing, right? I mean, why not do it that way if you can? Thats my gripe. "Basically, everything to gain and nothing to loose." Heres a dodgy scenario with figures plucked directy from my arse. I will choose figures that make it easier to understand and might not necissarily be what would happen but the will do to show the point. (A) Blocked PCV with catch can fitted. Catch can filters 90% of the oil out. But the gasses go through the cooler 100% of the time. (B) Dead standard system with no mods at all. It leaves 100% of the oil vapour in the gas. But 90% of the time the gasses go straight into the plenum and NOT through the cooler. In that scenario the potential for clogging the cooler is the SAME for the catchcan system with blocked PCV line, and the standard system. The contaminents in the vapor are much less with the catch can system, but they flow through the cooler much more often. The benefits tend to cancel eachother out somwhat no matter what figures you use. The catch can system is still better than stock because, the OVERALL amount of contaminents that reaches the ENGINE will still be 90% less than stock. But the amount of contaminents that will reach the COOLER will be similar. © Catch can fitted with PCV intact, see brownies last pic or my pics. You still get ALL the benefits of (A), and you get ALL the benefits of (B). Would you agree that in that case there realy is everything to gain and nothing to loose?

Na its cool man, im not upset or paranoid. 98% is just a bullshit figure I pulled out of my arse. But you can see that it is a large % of the time. It could even be more that 98% if the car is used mainly on the HWY. I'm just sick of saying the same shit over and over again. The thread was about PCV systems so I just added my opinion. The reason I raved for so long was that I felt my valid point had been ignored or missunderstood. I couldn't care if people dissagree with me as long as they have understood what my point was first, and tell my why their particular way is better (which no-one including you has done in this thread as of yet). I am not stubborly held in my ways, a simple explination of why any given method is better will change my mind. I think you have finaly understood what I was trying to say, but seriousy... Why would you purposly want fumes to (potentialy) clog up the cooler when it is just as easy to have them go staight down the plemum? Given the fact that this whole thread is based around preventing blowby related probs, I would like to here what the benefits would be, by intentialy passing extra fumes through the intercooler for no apparent reason. I will be VERY interested to here you reply. It seems very 1 step forward and 2 steps back to me is all. I hate to see people spend money and time on mods that might have negative effects. All it takes is a walk down to the importer to see how much crap ends up in a second hand cooler, even on stock systems which vent to the plenum. And also, now that you have accepted that the PCV does nothing for emmisions, would you please tell me what you think it is there for? No hard feelings