Jump to content
SAU Community

Recommended Posts

43 minutes ago, ActionDan said:

Is 250 going to be too much or is that small enough of a bump up to improve mid to high rpm performance without losing anything down low or is there no such thing as a gain in the low/medium/high and anything you do is just moving the band left or right and that's that. 

 

I think I refer you back to my 1st reply.  I think 250 is a very gentle increase in duration and it should be possible to install them so that you have very small increase in overlap.

2 hours ago, ActionDan said:

I'm mostly interested in response and low to mid range torque, though some more top end wouldn't be a bad thing, I just don't want it at the expense of low to mid range, it's a street car.

Then putting in longer duration cams won't do what you're after.

Advance your intake cam further for more response... or single TS conversion.

20 minutes ago, KiwiRS4T said:

You will be lucky to find anyone who can give you a before and after comparing type R with stock cams because usually (not always) people incorporate new cams in a new build. There's nothing wrong with sound theory - a modest increase in duration and lift should, if tuned right , give you a modest increase in power up top. Increased duration should work against response low down.

 

I would keep the stock cams and get a better single.


No single happening here. Victoria = defect and I just CBF dealing with that headache. 

10 minutes ago, GTSBoy said:

I think I refer you back to my 1st reply.  I think 250 is a very gentle increase in duration and it should be possible to install them so that you have very small increase in overlap.

Thanks for the info. Am I right in saying the overlap is the issue in terms of losing downlow grunt? 

So if I were to advance the intake cam further and have the increased duration, could I get the improved response and some improved flow up top?

5 minutes ago, Dose Pipe Sutututu said:

Then putting in longer duration cams won't do what you're after.

Advance your intake cam further for more response... or single TS conversion.

As per the above, So if I were to advance the intake cam further and have the increased duration, could I get the improved response and some improved flow up top?

59 minutes ago, ActionDan said:


So if I were to advance the intake cam further and have the increased duration, could I get the improved response and some improved flow up top?

Effectively, yes.  If you leave the lobe centres at stock, then more duration = more overlap.  Overlap is the thing that tends to de-optimise the cams for lower rpm, because it gives a longer window for reversion and cross-talk between inlet and outlet.  There's nothing wrong with more overlap at higher rpm, because you effectively need it to overcome the timing problems involved in getting the gas to move through the head with the short timeframes available.

Longer valve events always favour higher rpm breathing rather than lower rpm breathing, and there's no avoiding that.  Installing the cams so that you minimise overlap is not actually going to make the best use of them for their higher rpm effectiveness, but it will minimise any negative impact on the low rpm behaviour.  Add the increased lift on to that and you should be able to get a small positive result down low coupled with a decent mid range benefit.

Edited by GTSBoy
  • Like 1
9 minutes ago, GTSBoy said:

Effectively, yes.  If you leave the lobe centres at stock, then more duration = more overlap.  Overlap is the thing that tends to de-optimise the cams for lower rpm, because it gives a longer window for reversion and cross-talk between inlet and outlet.  There's nothing wrong with more overlap at higher rpm, because you effectively need it to overcome the timing problems involved in getting the gas to move through the head with the short timeframes available.

Longer valve events always favour higher rpm breathing rather than lower rpm breathing, and there's no avoiding that.  Installing the cams so that you minimise overlap is not actually going to make the best use of them for their higher rpm effectiveness, but it will minimise any negative impact on the low rpm behaviour.  Add the increased lift on to that and you should be able to get a small positive result down low coupled with a decent mid range benefit.

OK I have it right in my head then, and acheiving that will be easier with the smaller increase in duration of the Type R vs the Type A. 

9 minutes ago, r32-25t said:

Vcam will give you everything you're after

Would need to go to new ECU, plat pro can't do it. Already spoke to Haltech. 

6 minutes ago, r32-25t said:

yes you will, but it will give you what you want 

$$$$$$$

1 minute ago, Piggaz said:

Where are your current cams set at? Considered just playing around with them to get the low endish twist you want without the major expense?

Not sure, off the top of my head, but they were dialed in with response/mid range in mind. 

its not cost effective when it doesn't give you what you're after.

as a few have said just advance the intake cam a few more degrees to shift power lower, that's the cost effective solution 

13 minutes ago, ActionDan said:

Understood. 

Now, as per the original question, who can show me before and afters with Type R cams :)

pm Michael (aka Xklaba), he went from B to R poncams, also posted his feedback on few threads on here

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

    • You just need to remove the compressor housing, not the entire turbo. I would not be drilling and tapping anything with the housing still on anyways. 
    • So, I put my boat on a boat. First of all, I'm going to come out and say it. Why is Tasmania not considered a holy goal, an apex that all road-legal modified cars go to, to experience? This place is an absolute wonderland of titanic proportions. If people are already getting club runs for once in a lifetime 30 person cruises to Tassy then I've never seemed to see it. It is like someone replaced the entire place with an idyllic wonderland for cars, and all of the people living there with paid actors who are kind, humble, and friendly. Dear god. After doing a lap of almost all of the place I've found that it's a great way to find out all of the little things that the car isn't doing quite right and a great way to figure it all out. All in all, I drove for 4 hours a day for a week and nothing broke. I didn't even need to open the engine bay. This is by all means a great success, but it has left me with a list of things to potentially address. I also now have a 3D printed wheel fitment tool which annoyingly hasn't got any threads in it to actually assemble it. I might be able to tape it together to check the sizing I actually want to use, but it'll likely involving pulling the shocks out to properly measure travel at least at the front, and probably raise the car while I'm at it, at least in the rear. I scraped on quite a few things and I'm not sure how else to go about it. I was taking anything with a bump at what felt like 89 degree angles. And address those 10 other tasks. And wash the car. God damn it is dirty. And somehow, the weather was perfect the entire time - And because I was on the top of Mt Wellington it turns out it was very much about to freeze up there. I did something I typically never do and took some photos up there in what must have been -10 and the foggy felt like suspended ice, rather than mere fog. If you own a car in Australia, you owe it to yourself to do it.
    • Damn that was hilarious, and a bit embarrassing for skylines in general 😂 vintage car life ey. That R33 really stomped. Pretty entertaining stuff
    • Hi, I have a r32 gtr transmission. Does any of you guys have an idea how much power it will hold with the billet center plate and stock gearset? At what power level and use did yours brake with or without billet plate? Thanks, Oystein Lovik
    • Saw this replica police car based on a Mitsubishi Starion XX parked next to a 'police box' (it's literally a box) in Hirohata, Himeji City in Hyogo prefecture the other day. It's owned by Morii-san who is a local Mitsubishi Starion enthusiast. According to a local radio station blog post, he always wanted to make a police car himself based on ones he saw in his favourite Manga comics.  As it's illegal to modify a car to look like a police car and drive on the road, Morii-san tried many times to get permission from Aboshi police station headquarters nearby. They refused initially by after they got tired of that they granted him permission. However, the car can only be displayed on private property and obviously can't be registered as long as the police livery is present. The car was completed at a cost of 1.5 million yen (US$ 10,000) in addition to the car cost. A location was chosen outside Hirohata Police box where the car can easily been seen from the street. Morii-san has two other Starion road cars, both widebody GSR-VRs.
×
×
  • Create New...