Jump to content
SAU Community

Recommended Posts

This topic has probably been discussed numerous times but I'm interested to know what people are dialling in their adjustable cam gears at, and with a brief outline on the running gear supporting their dial-in figures.

Also if you have before & after dyno runs with & without the adjustable cam gears.

Link to comment
https://www.sau.com.au/forums/topic/229160-adjustable-cam-gears/
Share on other sites

yeah thanks for that guys.

I probably didn't come across clear enough though......I'm wondering whether you guys played with both gears or just the exhaust (which many of you do), whether you are retarding or advancing the gears and by how much.

I know SK in NSW tends to retard the exhaust gear only, by about 4 degrees (which is 2 marks on the gears) as a starting point and I was wondering if that is the norm for the rest of you.

This isn't with a GTR it's with my CA but we gained 15kw more throughout the rev range and 5kw more in the top end by playing with the cam timing. We were looking for more midrange but we could have gone the other way and looked for more top end but being a 1.8 litre it better off with the extra in the midrange and it made the car sooooo much more drivable with the bigger turbo.

I have the graphs if you want to look at them?

Edited by D_Stirls

Pete, as i said previously, ive fitted cam gears to a mates 26 previously, widened the torque ban quite surprisingly....obviously its wise to fit your N1 water pump and new timing belt at the same time, so if you want a hand or any help dont hesitate Pete. Ill try searchin through the dyno PC tomorrow and find the before and after runs.

Edited by Ryanrb25

CamAdjustmentsCA18detGT2871RTorqueM.jpg

CamAdjustmentsCA18detGT2871RBoostM.jpg

The red line is the base line.

The dark blue line is with inlet cam 5 degrees retarded, which basically gives it the same spec's as a CA18DE exhaust cam

And the light blue line is with the previous inlet adjustment with the addition of the exhaust cam being 2 degrees advanced.

The timing timing above is cam degree's so times by 2 to get crank degrees.

These are the Gears, this is when i was trial fitting them hence some of the bolts aren't fitted.

Image600.jpg

Edited by D_Stirls

Thanks for the info guys, that's great......Ryan, I'll be sending you a PM shortly.

Dale, that's exactly the info I've been looking for.

I'ts clear on the graphs that even though you're not gaining a huge amount of power, you are definitely making it earlier, particularly between 100 to 160 kph (in top gear I assume).

The more I've been looking into it for 26DETT's (can't really comment on others), the more I feel that adj gears will make more of difference on the street than cams and definitely more useable power.

I realize there are other engines out there that work better with cams on the street but even Martin Donan agrees (after a lot of testing on the dyno) that the $1000 for a couple of kw just isn't worth it.

yea in alot of instances (not all of them) cam's aren't worth the money for a streeter...

My mate lashed out 1600 bux for the Jun cam's which apparently are one of the best and to be honest it would have made very simular power with the stock rb20 cam's which are pretty good already. However im sure on a 600kw rb26 they would make a world of difference.

yeah spot on Ryan, even Shaun from Boostworx will tell you that 1 psi more boost can in some cases do what cams can do and its free.

As you say, for a big HP ie. drag car (which I'd love to build), cams are a must.

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

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...