VHR32

It was listed 3 posts up from your post and a few times over the past few pages in my piston list! Here tis: http://www.csgnetwork.com/compcalc.html

I put all the figures in the c/r calculator and it said 8.5:1 You cant work it out when the engine is assembled.

I rang Rocket Industries and they couldn't tell me much except they have a 5cc dome. Last sold a set in 2005 and would have to be special ordered. The guy told me they were n/a pistons and wont work in a turbo.....but he said he doesn't know anything about RB30's (obviously) I told him you need to use a n/a type piston with the twin cam heads. These 5cc dome pistons are in the middle of the flat top (8.5) and 10.6cc dome (9.3) other pistons and could possibly give 8.9 compression.

6x GTR injectors (NO I DON'T HAVE THE RESISTOR PACK) bought these ages ago to use for engine build up thats not going ahead anymore $250ono Still got these?

PM sent

RedDrifter was spot on. You will probably need to use it, it only needs a +12V to operate. Unless you are using a different throttle body which has a stepper motor ie XF, then an aftermarket ECU may be able to to control this and you can remove the Nissan idle valve.

EMS 8860. Motec features for less than half the cost.

On the back of the spokes on the wheels there should be number ie 30P or 25 etc. This is the offset.

Woah! That would be responsive and great off boost!

They are Rocket industries part numbers, they get them made from Arias and stock them here in Australia. All pistons suit 25 and 26 head, 26 has slightly lower compression due to the larger chamber. What c/r did yours turn out to be? What sort of boost do you run? Has much timing been put into it?

Sold to me.

I updated my piston list from P221 Added a new p/n for a flat top piston from Arias and added compression ratios for the Arias pistons. Two are quite high for a turbo engine! CP All compression ratios are based on zero deck height, 1.2mm head gasket (7.13cc), RB25 @ 62.5cc, RB26 @ 64.5cc. They assure me they have done alot of work to make sure the facts are correct. p/n= CP-RB30/26-.20 Flat top with no valve pockets 8.2:1 COMPRESSION RATIO with RB25 head and bit less with RB26 head 21mm pin 1.280" compression height Only stocked in 0.20 thou oversize but can be custom ordered in any size. p/n= CP-RB30/26-.20-9.0 6.0cc dome top, 9.0:1 COMPRESSION RATIO with RB25 head and bit less with RB26 head 21mm pin 1.280" compression height Only stocked in 0.20 thou oversize but can be custom ordered in any size. *Care must be taken when using on RB26 with more than 11.5mm valve lift* ARIAS Suit RB30/26 p/n= AP332103 flat top 21mm pin 1.280" compression height Only stocked in 0.20 thou oversize (86.5mm). COMPRESSION RATIO 8.4-8.6 Suit RB30/26 p/n= AP332104 10.6cc dome top 21mm pin 1.280" compression height Only stocked in 0.20 thou oversize (86.5mm). COMPRESSION RATIO 9.2-9.4 Suit RB30/25 p/n= AP332105 13cc dome top 21mm pin 1.280" compression height Only stocked in 0.20 thou oversize (86.5mm). COMPRESSION RATIO 9.5-9.8 WISECO Skyline RB30 w/ DOHC RB25det cylinder head 1.260" compresion height, 66.5cc head chamber, Dish top -11.3cc, 7.0:1 compression ratio, 21mm pin, 1mm gasket thickness, 1mm deck clearance. K577M865 86.5mm K577M87 87.00mm ACL 6MKRY9608 (VL turbo) 87mm, -4.5cc dished top, 1.261" compression height, 21mm pin, Standard RB30ET pistons are 7.8:1, with RB25 head it is 7.1:1 These are bumped up to 8.5:1 so with the RB25 head it may give about 7.5:1?? Using http://www.csgnetwork.com/compcalc.html I came up with 8.5 for VLT (spot on) and 7.6 with twin cam head with 64cc chamber. I entered: 2, 87, 85, 87, 1.2, 64cc, -4.5cc = 7.6:1 BUT these have a lower compression height than the CP/Arias and im sure it stuffs up my calculations but its late and im too tired to look at it any more...

Will take these: Tomei 1.5mm Block oil restrictor - $10 Billet alloy external fuel pump bracket, suit 044, 910, etc - $20 PM sent.

Don't use the Wiseco RB30/26 piston, it's 7.0 compression. Use CP or Arias pistons especially made for the 30/25+26 conversion

That table was for RB25 pistons wasn't it? Check my post number 4412 here for some 30/26 piston info: http://www.skylinesaustralia.com/forums/in...420&st=4400

But yeah, they're ok. Go buy them, cheaper than all the others.

Yeah whatever, I was just tying to help! I know Howard is hard to talk to sometimes, RB74 was just an example...

http://www.federaltire.com/en/html/product...?DB=motosports# Ok, 595RS is called a semi slick but it isnt like all the other semi slicks (RE55, A048, DZ02G etc) they have a much harder treadwear of 180 unlike the others.

I'm sure DBA 4000 series heat treated rotors will be up to the task. They are used alot in production racing and are designed for club racing. I've never had any problems over the past 7 years.

I knew there was one more brand that I couldn't think of! My mate Brad is the state distributor for these, says good things about them too. Offered me some to try in my car for the track.

Yeah Tim the 5000 series aren't available, just go DBA4926. DS3000 maybe a bit too much of a race pad? DS2500 might be ok, just depends how much he uses the brakes. I have Hawk HT10's which are good. Howard at Race Brakes Melbourne would be a good bloke to chat to. RB74 front, comp 2 rear? Make sure he uses Motul RBF600, Penrite 600 or any Dot4/600 brake fluid!

The Federals aren't a true R rated 'semi', and as said above they are similar to the Falken RT615 with a treadware of approx 200, not 50-60 like the soft R semis slicks. Motor magazine did a tyre test on these sometime last year in a 235/45-17 size. They said they had a RRP of $200 but that was wrong.

I got my caliper kits today. Front rebuild kits: Protex 210E0011 $35ea Rear kits: Protex 210E0103 $ 30ea They were single caliper kits (so 2 of each needed) These fit all Nissan front 4 spots (excl Brembo and some R34?) and rear 2 spot calipers. WRX also. ABS told me SJ6070 were to do both sides (not 100% sure about this though) I previously ordered SJ6024 (Japanese TRW/Lucas) and they were single caliper kits.

The hub ring is there to centre it BUT the load of the car is meant to be placed on the centre of the hub whether it fits with or without hub rings. You dont want the studs to take all the weight, this is how they break.

Yes 99% of aftermarket wheels will need them. The tyre shop will ask what vehicle they're to suit and supply the correct hub rings. Some factory wheels like Nismo/TRD may already have the correct centre bore because they are to suit 1 particular vehicle etc. Who said anything about stud patterns?! I think most Nissans have a 66.1mm wheel centre bore.