Jump to content
SAU Community

Recommended Posts

I was trying to fit my tomei poncams last night and everything was fine until........

I tried to fit the Cas unit to the front of the exhaust cam, its got a different kind of 'conection'.

Is there a difference between some of the rb25's cas unit? Mine has teeth and one locating lug that sticks out, the cam has two locating lugs...

I live in the uk and bought the cams from nengun so I am going to have to find some way of making them work, even If i have to buy a different Cas unit.

please help, anyone with photos of diffenert cas or cams?

thanks

Tom

Edited by tom200
Link to comment
https://www.sau.com.au/forums/topic/114187-rb25det-tomei-poncams-problem/
Share on other sites

also believe that the base circle is different on them too..

what is the product serial number for the cams you have ?

what is the month and year of your car as well??

pre oct 97 R33's all use the same cam regardless of series.. post oct 97 use the Series 2 option poncam, then r34 is different again.

The month and year of the car is unknown as its in my s13and I forgot he car I got it out of...... oh well...

I do know its a series two, I think it was a 96 or 97.

The cams came in a box that I chucked out, but they were for an r33. Maybe a late on with the r34 cas??

I have spoken to some guys here in the uk and I'm sure I have r34 cams so I'm going to fit r34 cas.

Thanks for the help lads.

Tom

143050

ECR33 Series 2 (RB25DET) - Duration: IN, EX 256 Lift: IN,EX 8.5mm

Thats what its says on the nengun web site.

So if I have these cams and they dont fit???? I must have a series 1 motor? unless thery sent the wrong ones... but i chucked the box now.

How can I tell quickly if i have a series 1?

Can someone post a photo of series 1 and 2 or r34 cas? I just want to know what car has the cas driven by these cams.

thanks

Tom

Edited by tom200
How can I tell quickly if i have a series 1?

Can someone post a photo of series 1 and 2 or r34 cas? I just want to know what car has the cas driven by these cams.

thanks

Tom

If you have a series one you should have a ignitor unit at the end of your coil pack rack at the back of the engine on the black plastic cover. Series 2 25's dont have a seperate ignitor pack.

also the throttle position sensor will look like a single unit on the S1 and look like a double on a series 2 .. but that still doesn't help the fact that a S2 made before oct 97 will still not be able to use these.

I was trying to fit my tomei poncams last night and everything was fine until........

I tried to fit the Cas unit to the front of the exhaust cam, its got a different kind of 'conection'.

Is there a difference between some of the rb25's cas unit? Mine has teeth and one locating lug that sticks out, the cam has two locating lugs...

I live in the uk and bought the cams from nengun so I am going to have to find some way of making them work, even If i have to buy a different Cas unit.

please help, anyone with photos of diffenert cas or cams?

thanks

Tom

get a r34 or my98 onward r33 crank angle sensor. or buy new cams. you can sell your existing crankangle sensor easy enough.

not sure on base circle but

and you need to swap the two triger wires around in the plug.. ie green/yellow green/red i think. the black ones earth the black/white is power

Ok mine is a series 1. it has the ignitor at the back on the top.

I'm thinking these are series 2 cams as I cant see how they woulb send r34 ones and i'm sure the box said r33 rb25det.

Is it ok to swap series1/2 cas. how much are they on here as I only found one tuner over here and they want nerly $1200au . that was for the r34 though.

I still would like to find an image of what cams / cas haved what drive, just to be sure what I have.

If they are 34 cams i'll just sell them.

I quickly made this models up to show what the difference is. If anyone can be sure what the tomei one is for, then please tell me.

My old cams have this to drive the cas - images 1 and 3

the tomei cams have this kind of drive, anyone know what car this is for? - images 2 and 4

-

once again, thanks for the help.

Tom

old tomei old tomei

post-22537-1145536212.jpg

post-22537-1145536237.jpg

post-22537-1145536251.jpg

post-22537-1145536266.jpg

Edited by tom200
  • 3 months later...

I am bumping this thread up because I seem to have the same problem. My motor is a SII rb25det (without ignitor). I just bought some tomei poncams part# 143050 and the cam angle sensor is different. Is it confirmed that I have to get an r34 cas and that it will work with my motor?

-Bluefire

  • 4 years later...

Bump :)

Was this ever resolved? What cams are in the very late S2's with the black CAS? Is it cams from the Neo engine???

According to wiki the RB25DET and Neo cams are different profile:

RB25DET Camshaft duration 240°in, 240°ex lift: 7.8mm in, 7.8mm ex

RB25DET NEO Camshaft duration 236°in, 232°ex lift: 8.4mm in, 8.7mm ex

So Nissan would have either have had to machine a special cam to accept the black CAS, or just take the upcoming Neo cam - when they were building the very late S2's.

Edited by Tony de Wonderful

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

    • I got back to Japan in January and was keen to get back on track as quickly as possible. Europe is god-awful for track accessibility (by comparison), so I picked up a first-gen GT86 in December just to have something I could jump into right away. The Skyline came over in a container this time and landed in early January. It was a bit battered after Europe, though—I refused to do anything beyond essential upkeep while it was over there. The clutch master cylinder gave out, and so did the power steering. I didn’t even bother changing the oil; it was the same stuff that went in just before I left Japan the first time. Naughty. Power steering parts would’ve cost double with shipping and taxes, so knowing I’d be heading back to Japan, I just postponed it and powered through the arm workout. It took a solid three months to get the car back on the road. Registration was a nightmare this time around. There were a bunch of BS fees to navigate, and sourcing parts was a headache. I needed stock seats for shaken, mistakenly blew 34k JPY on some ENR34 seats—which, of course, didn’t fit—then ended up having the car’s technical sheet amended to register it as a two-seater with the Brides. Then there’s the GT86. Amazing car. Does everything I want it to do. Parts are cheap, easy to find, and I don’t care what anyone says—it’s super rewarding to drive. I’ve done a few basic mods: diff ratio, coilovers, discs, pads, seat, etc. It already had a new exhaust manifold and the 180kph limiter removed, so I assume it’s running some kind of map. I’ve just been thrashing it at the track non-stop—mostly Fuji Speedway now, since I need something with higher speed after all that autobahn time. The wheels on the R34 always pissed me off—too big, and it was a nightmare getting tires to fit properly under the arches. So I threw in the towel and bought something that fits better. Looks way cleaner too (at least to me)—less hotboy, less attention-seeking. Still an R34, though. Now for future plans. There are a few things still outstanding with the car. First up, the rear subframe needs an overhaul—that’s priority one. Next, I need to figure out an engine rebuild plan. No timeline yet, but I want to keep it economical—not cutting corners, just not throwing tens of thousands at a mechanic I can barely communicate with. And finally, paint. Plus a bit of tidying up here and there.  
    • Nope, needed to clearance under the bar a little with a heat gun, a 1/2" extension as the "clearancer", and big hammer, I was aware of this from the onset, they fit a 2.0 with this intake no problems, but, the 2.5 is around 15mm taller than a 2.0, so "clearancing" was required  It "just" touched when test fitting, now, I have about 10mm of clearance  You cannot see where it was done, and so far, there's no contact when giving it the beans Happy days
    • It's been a while since I've updated this thread. The last year (and some) has been very hectic. In the second-half of 2024 I took the R34 on a trip through Germany, Italy, France and Switzerland - it was f*cking great. I got a little annoyed with the attention the car was getting around Europe and really didn't drive it that much. I could barely work on the car since I was living in an inner-city apartment (with underground parking). During the trip, the car lost power steering in France - split hose - and I ended up driving around 4,000kms with no power steering.  There were a few Nurburgring trips here and there, but in total the R34 amassed just shy of 7,000kms on European roads. Long story short, I broke up with the reason I was transferred to Europe for and requested to be moved back to Japan. The E90, loved it. It was a sunk cost of around EUR 10,000 and I sold it to a friend for EUR 1,500 just to get rid of it quickly. Trust me, moving countries f*cking sucks and I could not be bothered to be as methodical as I was the first time around.
    • I assume clearances were all a-okay?
    • Shock tower brace is in +5Kw....LOL  
×
×
  • Create New...