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change of plans
well my turbo project has taken a change of direction. it is now going to be a rb30det. it will have the rb25det head on it. GReddy plenum. possibly Autotecnica exhaust manifold with low mount turbo. Minimum GT35R turbo (not sure on size yet). 3" exhaust. Intercooler. Haltech computer. Probably Crower rods. Forged Arias pistons as they do pistons specifically for the rb30/rb25det conversion ( although i will have to check they are flat top not dished as dished pistons lower the compression too much with the extra cc of the rb25 head), polished crank, oil squirters (off the rb25 but will fit rb30 and squirt oil up underneath the pistons to cool them down for extra boost), rb25det gearbox, bigger fuel pump and injectors, possibly GTR valve springs, opened ports, higher flowing oil pump (possibly off rb26dett but will have to check specs), and i'm yet to see if the head i'm getting is vvt or not. looking to push a max of 18psi.
theres a dyno sheet of a guy on the net who did the conversion and he is getting 467rwhp with stock manifolds and rb25det ecu so i'm hoping to get a fair bit more. fingers crossed!!!!!!!!!
Try to get an N1 water pump and Oil Pump.
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It is an upgrade GTR version of both pumps.
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thanks for the tip. i just priced the oil pump. not much dearer then a standard one. i'm thinking of using the standard water pump though!?
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well i have found out i have 3 options for pistons. dished, flat or dome. the dished (rb30et) pistons drop compression to 7:1. flat (rb30e) pistons are 8:1, whilst dome top (rb25det) pistons run 9:1 compression. i was advised to run the dome top for better throttle response and Rocket said i can run 20psi with them.
i am running standard cams with adjustable cam pulley on the exhaust cam as the inlet has VVT. as i'm not increasing lift i can use cheaper valve springs which are still stronger then standard. just doing this saves me over $1000. which will pay for forged pistons.
i will use a N1 oil pump with rb25det oil squirters.
still deciding on what rods to use. standard rb30 shotpeened are very strong but may not be strong enough for the power and revs i'll be puting out.
autotecnica low mount exhaust manifold will be used.
and either GReddy or autotecnica plenum (now that autotecnica have got their problem fixed).
a few other bits and pieces to work out.
I heard that the RB26 head is one to use for conversion as RB25 has smaller bore size than the RB30 which would raise compression
Correct me if i'm wrong though as i would find it LOT easier sourcing RB25 head than a RB26 item
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using the rb25 head lowers the compression. and it is a lot easier to source and a hell of a lot easier to fit then a rb26 head.
OK sweet - handy to know but wouldn't fitment issues be the same with either head or am i missing something?Originally Posted by bangers
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the rb25 head bolts straight on. the rb26 has gallery issues. the only drama with the rb25 is if it has vvt you have to weld part of one oil gallery and retap into it from the side.
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yet again another change. i am now running a high mount manifold as the low mount doesn't have the provision for external wastegate. hypertec NA pistons will go in for better streetability. still debating which plenum to use.
I have an external gate on my low mount.
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what brand is your low mount?
I had it custom made, cost a bloody fortune!
I know of a guy who could possibly make one up for you, he does great work. Duz360 on calaisturbo.
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From memory i think they are around the $800 mark.
Also on Calais Turbo is a bloke called 6boost, he makes them also around that sort of price, both look like top work.
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