Jump to content
SAU Community

Recommended Posts

Tomei cam shafts are designed to be used with stock cam gears (lobe centers so you dont really need to be dialed in, unlike HKS cams for example), so should guarantee any cam gear will work (even a intake one on the exhaust side). I would be checking if you actually have a RB exhaust cam wheel, it's possible you've been sent one to suit a 2JZ, or 4G63 or something like that. Take a pic if possible.

Silly question but you aren't trying to put an aftermarket cam gear onto an inlet Poncam are you? Because you can't since it is made for VCT. I know you said exhaust cam gear but I thought I would double check.

Edited by PM-R33

i ended up using poncams from a late rb25 (black cas) and my old stock 25 cams had a hks exh cam gear (old style)

i thought i may use the vct down the track with a switch so decided to keep it..

so went to fit it to find the bolts dont line up, hence y u need to use a tomei cam gear!

mercury, can u fit the stock cam gear to the tomei cam? exh side?

cheers

strange. i am running tomei cam gears on standard cams without any issues

not very strange, just not easy to pickup unless really looking at whats going on. I had this shown to me yesterday with 4 brands of camgears and 4 different brands of camshaft. With the verniers locked after measuring the Tomei cam gear locating hole its very clear that both GReddy, HKS and Nissan gears hole is smaller. When placing the Tomei camgear on the Apexi, HKS and stock camshafts used as examples there is some quite noticable slop of a few degrees until the bolts lock the camgear onto the camshaft face. Put that gear on the Tomei camshaft that was also there and it didn't move at all with no bolts as the locating pin and recess in the rear of the camgear were a perfect fit. The HKS, GReddy and Nissan camgears would not fit this camshaft unless force was used to disform the locating hole allowing the gear to be pulled up square with the face. All the items were new or near new and both the HKS duralumin and HKS early style were the same. Paul pointed out that when running poncams a few years ago he had the same issue with OS Giken camgears. He also showed me with verniers how much larger the Tomei locating pin is. The GReddy, Nissan and HKS gears were a perfect fit on all the cams except the Tomei. He pointed out that the Tomei gear will work ok but depending on where it is positioned when tightening the bolts will affect the camshaft timing by a few degrees and if the gear is pivioting during the rising and falling of rpm will affect performance.

Im sure this is something the untrained eye would not pickup but when guys who are playing with this stuff on a daily basis using quite a range of brands these little things are easily picked up. Either that or Paul is looking harder than most.

Edited by blitzxtr

How much bigger is the pin? Not doubting, but i cant see how people are fitting stock gears if the pin is bigger, any more than a 2 thou inteferance fit, and you will be smashing the gears on with a hammer, which i cant see people doing. Maybe the design of the cams has changed?

Edited by Adriano
How much bigger is the pin? Not doubting, but i cant see how people are fitting stock gears if the pin is bigger, any more than a 2 thou inteferance fit, and you will be smashing the gears on with a hammer, which i cant see people doing. Maybe the design of the cams has changed?

Tomei pin is 6thou or 0.15mm larger, same as the locating hole in the Tomei cam gear. Standard pin is 6mm and Tomei is 6.15mm. Three sets of Tomei camshafts were measured to check this ranging from brand new ones out of the box, a pair 2 years old and a pair 6 years old, all the same. HKS pin is 6mm as well as Apexi. This was measured by a very experienced engine builder and double checked by a mechanical engineer with 40 years experience using Mitutoyo equipment.

Ive got tomei poncams installed to RB25 with stock inlet camgear to retain VVT and aerospeed exhaust cam gear, adjustable

aerospeed cam gear was from a group buy a few years ago

installed and setup without any issues

I'll be using a pair of aerospeed adjustable cam gears with Greddy Street-Special N1 RB26 camshafts on my rb26 motor, when I build it and install into my stagea

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

    • Hi, i’m making a rb25det coil loom for Vag short coil. Can anybody tell me which Ecu signal wire belong to coil number 1 and 2,3,4,5,6? The connecting switch in above pic is 8 wire i think white is for +12v and black for earth.
    • Was there ever a model of the Stagea m35 that didnt have a badge on the grill? I thought I saw that somewhere, some aero edition or something? I cant find it again? davemoto
    • Its a 2002 vr-x four VQ25DET, silver. Coil overs, lowered, polished alloys and sport exhaust. Bit of a project, was sitting in a shed for a while but runs and drives great.
    • I wasn’t able to replicate the sound anymore. It was a one time sound so maybe it was just coincidence but it was like small pebbles being dropped in a coke can.   should I try cleaning the MAF? It could be it’s functioning but dirty? I don’t know.
    • Update 4: Hi all. The car drives again! Haven't driven for long, only to store it in the garage again, but the test drive was successful. The coolant and oil leaks seem to be fixed for now. Temps on the engine were also very good, while moving I never even saw 80C water during the approx. 30 minute drive. Ate up all the coolant in the reservoir though so will have to fill that even more when I go to the car next time. One thing that pisses me off is that the RPM gauge is still f**ked, I even resoldered the board twice and used copper paste on the silly screws that are used as connections. Next time I take it out I'll take apart the board and fit new components, I'll see if I can get a replacement IC for it.  I have an appointment set for 22nd of September for the engine tune to 370hp. Alignment also still needs to be done. My hope is that I can get all the legal stuff over with by the end of this season. Anyone of you have advice regarding intercoolers? Currently there is an APEXI core fitted, one of those weird hybrid ones, 600x270x76. I don't think it's bad but it's not new and now I still have the chance to change it now to legally include it in the paperwork. Only issue is that the only options that would arrive in time are a HKS Type R intercooler or generic Ebay spec intercoolers comparable to a JustJap one. Ideally I'd order a Plazmaman but it takes over a month to receive which would mean making the car legal has to wait until next season. Would love to hear some input on this. Same story for my injectors, the previous owner was a nunce and put ID 1050x on the engine. They work but are obviously not ideal at "normal" power levels. But I don't see a reason to change them unless the tuner says it's necessary. I read online before buying a different exhaust that the top secret style rear diffusers won't fit due to the size of the rear resonators. My buddy and I made it work by slightly "adjusting the shape" of the mounting bracket and making some spacers out of 3d print for the mounting bolts. Fits like a charm. Just putting this here in case someone has this problem. Even the hefty HKS Silent Hi Power rear can fits without hitting anything.
×
×
  • Create New...