Hey all!!! Just looking for a bit of insite into the upcoming engine build. Plan on building a tuff VG that will run in the 400rwkw with ease, with as much reliability as can be achieved with VG30. Mods I have already or that are on the way. Larger side mounts GT28RS .64AR UAS manifold 3" dumps n twin system High flow cats Larger Koyo radiator 650cc Sard injectors 19mm oil cooler Light pully set On the way 4L stroker kit. Locals may have seen the sale Stroked crank shaft Pistons 97mm Venolia 8.9:1 with teflon buttons Deves rings Crower connecting rods n JE wrist pins Ok, So here is the part that Im looking for advice on. a, which mods to go with to complement this type of build / desired outcome. b, Who should I take the block to around Brisbane to get bored and sleeved?? List of parts ill be in need of, open to suggestions. ? CAMS. Tomei, JWT 400 or 500 ? CAM GEARS. JUN OR TOMEI ? SOLID LIFTERS?? ? EGR ELIMINATOR KIT ? RACE TIMING BELT ? VALVE, SPRINGS KIT ? STUD KIT ? LARGER THROTTLE BODYS ? DUAL INTAKES ? 2x APEXI AIR FILTER ? FUEL REGULATOR, FUEL PUMP ? LARGER INTERCOOLERS. Either Big sides or front ? Maybe Nismo 850cc injectors with rail. ? After market ECU, not sure on brand Cheers
Im in no way a turbo guru but i would say go with the szp900 kit with twin 3071's especially since you will have an extra 1 litre of displacement.
I know what you mean. But Im really looking for fast spool and big torque down low. Have the 2860rs's atm which Im pretty happy with at 16psi, so Im thinking with 22-24psi pumping through it should still pack a good punch. The car is predominantly used for drift(Is not road registered and wont be) and a lil track. Maybe a little drag, just for fun. What Im really looking for is plenty of power/torque/responsivness down low with a respectable high rev figure too. But Im not just going for the biggest figure possible at the highest rpm possible. Its really the performance through the entire rev range that Im looking for. Sorry bout lengthy explination.
You better start looking into those sleeves you need to run those enormous pistons. That won't be cheap... Sorry, I don't know of anyone that can do it in Brissy. You might as well get a bit of head work done while it's all apart. You are going to need new valve springs (go the JUN's or Tomei's) with large cams, so get it done while it's all apart. I wouldn't bother with the solid lifters unless you want those huge Tomei cams which are probably a bit peaky for what you want. If you aren't revving it too stupidly (under 7.5k) the hydraulics should hold up ok.
Cheers Chris. Yer deffinately going to do some head work while its all apart. Was thinking of the JWT 500 cams. Thoughts?? Or is it worth modifying stock cam shafts?? Going Tomei or Jun cam gears. Got a couple of guys round brissy pricing up sleeves as we speak. Thanks for tips so far. All educated advice appreciated
regarding heads and cams, if it's purely a track car i would look at tomei 272 10.25 cams and gears and solid lifters as well as some decent port work and new valves. I assume with the stroker kit you won't be looking at a high revving motor (8K+) so I would worry about the dual spring kit. Reground stock cams will only give you so much, and you'll be looking for more flow so I would look into the cams like Tomei that are ground off clean blanks. ? EGR ELIMINATOR KIT Guarantee the one in there doesn't work as it was intended so either shift it or replace it new...i would shift it. ? RACE TIMING BELT For the extra $100, it's worth it I've been told...making this decision myself at the moment and decided to go with the PE Kevlar belt. ? VALVE, SPRINGS KIT answered above ? STUD KIT Definately ? LARGER THROTTLE BODYS Minimal gains, some will argue, but the stock flow plenty, maybe bore them out a bit and fit larger butterfly's ? DUAL INTAKES For the sort of flow your looking for it would help definatley. ? 2x APEXI AIR FILTER 2 intakes, 2 filters, apexi make a good one so why not. ? FUEL REGULATOR, FUEL PUMP Upgrade your fuel pump and an adjustable regulator is a must. ? LARGER INTERCOOLERS. Either Big sides or front Gotta keep it cool. ? Maybe Nismo 850cc injectors with rail. Depends if you want to run E85 or not. Nismo don't play well with alcohol and you'll want probably 1000cc for 400rwkw ? After market ECU, not sure on brand Many to choose from, good reports on the APEXI for good tunability on the stock loom.
the tb's can be bored out to 55mm, but seems to be a bit of waste if your keeping the current piping system.
i still cant believe you could put a 97mm piston in. even with sleeves... 92mm is pushing it even with a brand new block.. 97mm is CRAZY !!!! considering stock pistons are 87mm !!!
im glad i bought my house, which has stopped me impulse purchasing parts for the zx this looked like a decent kit even though fair bit of coin req'd to get it up and running edit: will need larger injectors and i would look at larger turbos
Even on petrol those numbers are well over-provisioned, sitting on max inj duty I'd imagine. I recommended 1000cc for use with E85 as stoich of E85's is around 11:1ish, so you run a higher volume of fuel per volume of air, and you'd have about 65% duty on 1000cc on e85 @ 400rwkw, and around 40% on petrol. So lots of room for more HP!!!
Thanks for the advice so far guys. Yeah I know what you mean man. 97mm is one big jump. But will see how we go. Engineers are a little concerned about how much will be left to bolt the heads too. But Im not to sure with this sorta thing. All a learning curve for me. Looks like an expensive one too. But hey, as long as Im having fun, its all good. Engineers measuring up and quoting, so ill keep you all posted. Hmm didnt realise I would need such big injectors either. I know the Z1 boyz in the US are running over 700hp with the 740cc n over 800hp with the 850cc. So 450kw = about 611hp right??. So how much power do you loose from engine to the wheels??? Aint all that concerned really. As long as it is smoking tyer's(at least 255's) by 3000rmp with lots of torque im happy.
I imagine you will only be making around 5psi at 3kRPM so maybe not tyre smoking then, 4500 is more like it
The thing with injectors is that they're all roughly the same price be it 555's or 1500's. Once you crest the 800cc mark on a 6 cylinder you start to run into low rpm over-fueling and tuning difficulties. The reason I said 1000cc is that as alcohol blends become more prevalent, and you start to use it, then 740cc's will be pushing it at 400rwkw. Theoretical max on E85 would be around 380rwkw or 450kw at the flywheel based on rough calculations. I run E85 on 540's and I hit 85% duty at 280rwkw.
Not sure how strong the block would be with sleeves that large. You want to look into filling water galleries with strengthener to strengthen the block. Also make sure the crank and rods are balanced to reduce stress to the block. Those would be two things to look at when increasing the bore diameter ALOT
