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Spoolup

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Posts posted by Spoolup

    To Cat Or Not To Cat

    in Forced Induction Performance

    Posted

    yeah I agree, the funniest part is there are people on here who think you can make 600rwhp for $5k

    I wasnt trying to make a point about my power, I was trying to point out that you can actually buy a cat that will flow that sort of power, which I find totally amazing. But maybe ists just me :-)

    To Cat Or Not To Cat

    in Forced Induction Performance

    Posted

    The point is, is that I have a cat which is a legal requirement. The other point is that with other cats around I wouldnt be able to achieve the power it is currently making.

    Come for a drive, the throttle response is perfect, the mid range is intense.

    Fuel economy is not worth mentioning - but you wouldnt expect it to be.

    To Cat Or Not To Cat

    in Forced Induction Performance

    Posted

    If you want to pay the $ - there are cats available that will flow as much as you want to go.

    I have a CES cat and make 581 rwhp - we dropped the cat on the dyno and picked up 7 extra whp.

    I have used one of the cheaper cats on the market who claim to be the beex kneez - it melted the internals after 7 power runs.

    Rb25/30 Neo

    in RB30 conversions

    Posted

    yes sounds feasible - but are you planning to run the neo lifters as well ? So you will have an under bucket shim and a over buck shims ( sounds like to many shims :-) ) - or are you planning to run a different lifter bucket ?

    ok, it seems your right but i think i have a plan. Im gona use gtr retainers and shims as they shim from underneath, so that will imitate the tipping your talking about. then, ill have to find some springs thatll be suitable or get some made, that shuldnt be too much of a prob. wat do ya think wise one?

    Pistons For Your Rb30

    in RB30 conversions

    Posted · Edited by Spoolup

    for your power - just run a set of std RB30 rods and NA RB30 pistons - they will handle it and obviously a direct fit with no issues.

    $1500 is still much more than I want to pay when standard items have been proven more than capable in the power range I'm aiming for.

    Pistons For Your Rb30

    in RB30 conversions

    Posted

    yes that is exactly corret - on the VG30 there are two rods per journal ( being a V6 ).

    So the width of the journal is just different to the RB30 and that is why the VG30 is different

    i dont no for sure but i would presume that the crank is just sized/designed differently to accomodate the thinner rod.

    Rb25/30 Neo

    in RB30 conversions

    Posted

    The tips of each valve is built up a little with weld - they are then ground to the determined length. Its cheaper than 24 custom valves.

    With aftermarket springs there is enough room to run up to 12mm lift with out the springs binding - its just the oil gallery issue that needs to be resolved.

    Rb25/30 Neo

    in RB30 conversions

    Posted

    Yes they are a great head.

    Just install your cams and turn the cam until you have a valve at maximum lift, then check your lifter and see if the oil gallery that runs along the lifters ( inside the head ) is exposed. If so you can not use them as you will never get oil pressure.

    With my setup anything over 9.8mm lift exposed the oil gallery.

    Im in the process of building a new head and trying to get around this my using small base cirlce cams and tipping the valves ( extending them )

    Cheers

    These NEO heads are really interesting and WAY different to any other rb25 head.

    Hey Spoolup, do you mean I cant run the cams Ive got? I know they dont direct fit, ive had to grind a tiny bit off where the lobe catches the head around the edge of the lifter. BUT, in the R32 head i wuld have had to cut shitloads out but in this head i only had to cut a little bit. Maby this is partly because the Neo Buckets are wider diameter than r33 lifters, and a totally different design even to the gtr lifters. so far so good. the other thing is te shims in the Neo buckets are exactly the same diameter as Subaru shims, so thats a cheap alternative I used to get the clearance on my cams right coz theyre way more common to find

    Pistons For Your Rb30

    in RB30 conversions

    Posted

    vg30 rods are about 1.5mm to 2mm thinner across the rod ( thickness ) than RB30 rods - so when using VG30 rods you end up with a rod that slides back and fourth on the big end journal.

    I can tell you for a fact that vg30 rods fit. thats what im using. However i got custom JE pistons made to suit and eagle rods. VG30 rods are 154mm (6.070in) and rb30 are 6in or 152.5mm thereabouts. so vg30 are 2.5mm longer, i havnt bothered trying to find out if they work with std. pistons etc. VG30 DOHC rods from 300zx etc have a 22mm rod bush, SOHC use a 21mm rod bush, same as all RB engines, so to start with youd need SOHC 300zx rods from something like a maxima. both VG rods use the same bottom end as RB so use the same bearings, even the acl website use the same partnumber

    Rb25/30 Neo

    in RB30 conversions

    Posted

    Yeah I would just double check. It would want to be a pretty thick gasket.

    Unless they are just mistaken on what piston they are using.

    Im using RB30 ET pistons with a 4.5cc dish and have 8.5:1 , not a 11 cc dome like rb25 pistons.

    Rb25/30 Neo

    in RB30 conversions

    Posted

    Is that r33 rb25 or r33 rb26 pistons they have used ??

    If it is either, youll need to run some serious race fuel as your comp is going to be over 10 to 1

    I heard that the exhaust valves are bigger then the rb26's. They actually used r33 cp pistons which gave a higher comp ratio on the Neo head. But all technical aspects I would need to talk to the builder as my mechanical knowledge is little. It was pretty much drop my car off and let the workshop do their magic.

    Rb25/30 Neo

    in RB30 conversions

    Posted

    you wont be able to run those cams in the NEO head, the lift is too big.

    yea well im hoping they will be sweet. I initially got them custom made to suit vg30 rods for a better rod/stroke ratio but i was going to use them with an R32 RB25DE head i had. they have a bit of deck clearance so i have room to deck the head if need be as well as play round with gasket thickness, so i dont think it will be a problem :( . also, since i got custom cams made (276 10.5mm lift) for the r32 head, i figured that to run them in the r34 head im going to need to run the r32 CAS, and im not going to run vvt, just block up the oil feed hole

    also, just out of interest, i thort r34 heads had bigger valves but they look the same as my r32 head. again i dont have proper measuring tools on me im gona bring them home from work on the weekend to suss everythin out

    Lifters

    in RB30 conversions

    Posted · Edited by Spoolup

    The RB25 VCT ( GTST ) springs will not fit as the exhaust is a different length to the intake - where as the R32 RB25DE are same length ( same as RB20 and RB26 ).

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