Jump to content
SAU Community

Recommended Posts

Hi all. First off I'm no expert in skyline engines. Now thats out of the way.

Block I'm using is a s2 block. Std crank spool h beam rods and arias -10.4cc forged pistons. Block will get the usual jobss done acid wash hot tank and bored 40th to 87mm. Will be decked to zero deck height. Will use a 1 mm head gasket and neo head. Head is currently in the car on 25 neo engine. Head has been ported with stage 1 pon cams. Flywheel is from extreme billet lighten flywheel. 6 puck sprung button clutch. Inlet will be a greedy copy manifold with 1000cc bosch injectors. Hot side is custom made hi mount manifold by myself in t3 form to a gtx3582r garrett ball bearing item. Fuel will flow via 2 bosch 044 pumps. Will start with bp98 fuel then change over to e85 later on. Nistune will control all the electronics. Spit fire coil packs will fire the good stuff.

If anyone has same sort of set up would appreciate input as to what power I should be able to expect.

Link to comment
https://www.sau.com.au/forums/topic/451449-rb30-25-neo-build/
Share on other sites

301 to 399 rwkw. Too many unknowns. Is it going to be fully balanced with a new harmonic balancer and revved to 9000+ or standard and limited to 7000? Build and tune all count for a lot. You may end up with a sky high compression ratio which will be a problem unless you have access to E85. Don't use Bosch pumps - get something more modern, quieter and E85 friendly.

Those pistons are vl turbo spec.

Have you already bought them?

If not look seriously at something with less or no dish to get the comp up. The days of low comp have been and gone.

If you already have them, no worries, boost it up!

Looks like boost up as I have them already. For 700 delivered not going to complain. Will deck the head and use as thin as possible gasket. Head is fitted with cams 256deg and 9.15mm lift. E85 is available easy access. Will be balanced annd haven't set a rev limit yet

Besides this engine is going into a lc torana witch is around 400+kgs lighter than a r34 skyline. Neos run 9 to 1 comp but are 2.5lt engine. This is a 3lt engine. Off boost shouldn't be too bad as the 30det's only run a mid 7 to 1 comp. Off boost in a vl they are fine.

If 0 deck heights min HG thickness is 33thuo for clearance

I think the dish is a bit big can you machine them down 40-60thuo and then deck block to match

I run 14cc dome top with 0 deck hieght and 1.1mm HG with 63cc combustion chamber ( 26 head ) and have +/- 9.5:1 state CR

I can machine the pistons down 40th and take 40th off the head. 8.44 to 1 was working on 1mm hg. By doing pistons and head machine work will bump it up around 9 to 1. Have looked at the 30 hybrid pages and read verrious builds but not close to what I'm building. Haven't seen any other builds with neo head and gtx35

I've got the bulk of my engine together now

Rb30, Neo head,

Spool I beams

Wiseco 9cc dish pistons.

.051" gasket

Head studs main studs

Standard head and cams to start with but has springs and ti retainers

CPC plenum 6boost manifold gt35

6x LS2 coils

Running a .001 deck height and we had to deck the head down to 46cc ending up with high 8 comp.

I'm hoping to make around 400-450hp with the standard cams on 98 (auto)

Hey lcxu105

I think you may have messed up there with your gasket thickness. Because you're using mm but you are using inches measurement for the gasket. The gasket should be 1.295mm

Using the calculator above. mine comes out to be about 8.94:1

using the summit racing calculator (which allows to you to change hg to inches or mm) I get 8.98: 1

Mind you I could be wrong

Edited by Huzqld

Huzqld you're comp ratio will be a high 9.6 to 1. Mine with a .51 hg and 50cc head wwill be 8.96 to 1.

you have to put the HG thickness in in MM on that scale setup, so you have put in .51mm not 51thou which is closer to 1.3mm

Edit, should have read the whole page before posting lol, Husqld beat me to it :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Even more fun, leave all the ADAS stuff plugged in, but in different locations, hopefully avoid any codes!   And honestly, all these new cars with their weird electronics. Pull all the electronics out Duncan, and just shove an aftermarket ECU and if needed a trans controller in, along with a PDM. Make it run basic but race car styled!
    • To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
×
×
  • Create New...