Dale FZ1

All of the above. It's worth following the literature about each year's successive efforts by motorcycle manufacturers to increase power. Generally increased high rpm durability is a focus of the engineers attention, but they DO come up with some really good ideas from time to time that helps retain linear, predictable throttle response. Check out how they control air induction, and set up fuel injection. Exhaust techniques aren't bad either. Note that the smaller capacities attain higher rpm due to shorter strokes and lower mean piston speeds. Conventional engineering there, and also leaves them needing to be wound up to go well. Having sold a litre-class bike to get my R33, it's interesting to see how the engineers reached their goals with the car. In some ways I see the RB25DET as more aligned with a sporting V twin (eg Suzuki SV1000) than a hyper sports I4 (eg Suzuki GSXR1000). Torque, rideability, handling, but not too likely to bite the ham fisted operator. With vey high rpm comes special setup issues for the remainder of the driveline - esp gearboxes. cheers

Hi Brett Try this site http://www.qldmotorsport.com.au/upcomingev...bruary2005.html The Saturday Sprints are there as I told you about the other day. Ton of fun, and should be just the thing for that horn 34 of yours. cheers Dale

Sounds a fair deal. It's worth noting that there were no problems experienced by the rest of us in the buy, other than the (normal) lack of patience when some guys were getting theirs a couple of days ahead of others. No problem otherwise. Hopefully the inquiry with shipping agent will get it sorted quickly. cheers

Ok, old thread but more to add/ask. RB25 part number is the same as for auto spec S15, regardless of JDM or Aust delivered. The manual spec S15 has a separate part number from the 370cc unit, again Nissan Aust show them to be the same part regardless of JDM or Aust delivered. Are the JECS specifications for the higher flowing injectors available? ie. to fit them up, the PFC needs to be told the flow size correction value, plus the lag time. Can anybody point the way here? cheers

Looking forward to it. The PFC gives you the freedom you need to make the hardware changes work for you. Please make sure you post up the results. cheers

Yes, plenty thanks. I will chase it up and post what I find out.

Does anyone have a suggestion where I can take my injectors to have them bench tested and flowed (measured output)? I know the RB25 jobs are rated at 370cc, considering a hi-flow if that's possible. My location is Sunshine Coast so local or Brisbane would be handy. cheers

Likewise... I've dropped an email to the buying group about this as well.

I understand that a complex at Kilcoy is being strongly considered but don't know who the players are, or what form of motorsport they intend to cater for. I'd also heard that they are trying to get a hillclimb event going there for 2006. That area could do with some development and support. Main industry is the meatworks and timber up in the hills. Darlington Park - great venue, but sadly it's long gone. The family who built it are getting out of it after they guy whose dream it was died from heart failure. Urban encroachment is a poor reason to force these venues out of existence. I do have to say after having done a couple of ride days there that runoff areas were not adequate in a couple of key spots. Otherwise track layout etc were fantastic.

Yes - it's arrived today. Time to check it out.

Hold steady, I'm waiting too. The postie is going to be happy when I stop harrassing him each morning.

A Google search on oil temp was enlightening and confusing to a degree. found a Volkswagen owners site, discussions on this topic. Evidently being air cooled those old things are extremely hard on oil and really need good monitoring of temps. Some of them go to the trouble of installing multiple senders, noting the different temps according to location. The sump is probably the best "average" value, being the reservoir from which the whole lubrication system is fed. The oil pressure sender is not subjected to full flow (that I am aware of) and a take-off there may not accurately show the temps of the main body of oil. cheers Dale

PM re turbo.

Gold... just gold. The best way to get full entertainment value is to look for them on your daily travels. Sort of like waiting around the shopping centre carparks to watch the efforts there.

You have email response cheers Dale

I'm after one that is now considered junk. I'm just after the housings for a possible high flow, and the chance to measure up the compressor wheel. cheers

Rotating assemblies are likely to use similar compressors (remember there is a wide range of actual wheel specs available). Turbine on the HKS should be a 53.8mm wheel, while Garrett will be either 56 or 60mm from memory. The nomenclature indicates that HKS have used a T28 series turbine housing, while the Garrett uses a GT30 turbine housing. When spec'd for Skyline, they both have the T3 turbine inlet flange, but the airflow characteristics/capabilities are clearly going to be very different. Then there is the issue of internal/external wastegating. Expect then that they will have significant differences in operating characteristics. Try doing a search on the topic - plenty of posts by Discopotato03 who is well versed in the technical aspects of these units. As always, remember to size the unit you choose to suit a particular power range and application. cheers

Yes, thanks I was aware of the differences in material construction. It's the actual physical measurements I was interested in. I'd like to see what the wheel size and trim is. cheers

I'm chasing a RB25 stock turbo in blown condition, from either R33 or R34. Anyone who has overboosted their stocky for too long and had the turbine wheel part company? PM me if you have, please.

Has anybody measured the dimensions of the compressor and turbine for the stock turbo units for an RB25? Search showed that the Neo unit has gone to a larger turbine A/R housing. I'm interested to see what the specs of the wheels are between the R33 and R34. If anyone has access to stock turbos from either model, can you measure (accurately using verniers) the max/min diameters of the wheels (aka exducer/inducer) and post them up please. Ignoring the materials the wheels are made of, it would be good to see exactly what changes Nissan made. cheers Dale

What upgrade did you use Choyda? ID numbers if possible please.

There is plenty of previous discussion on this topic. Search, you will find more comments similar to above.

A bit of both actually... Most guys seem to go for the Nismos, various opinions about what is the best size for upgrading. They just happen to be reasonably pricey but at least are a direct fit replacement. Having searched, I saw a comment that S15 may fit the 25. Just asking to see if anyone had done so. cheers

I have done the searches, just chasing experiences from those who have upgraded (or directly seen upgrades done) on the R33 spec RB25. Obviously Sard and Nismo offer direct fit 550 - 740 cc sizes, with the need for collars for the Sard items being regularly commented on. There have also been comments about S15 spec Silvia injectors being an option. Has anyone here actually fitted them, and are they big enough to actually be an upgrade item? cheers

Looking forward to this gear arriving.