Jump to content
SAU Community

Recommended Posts

I

On 9/21/2016 at 1:36 PM, r32-25t said:

Higher lift help a lot with power and maybe a little response but longer duration is a massive detriment to response, it's actually surprising how little duration it takes to have a big effect  

Its also suprising how little duration you need to make big power..

there is so many overcammed rbs going around..people like to point out peak figures..it means shit..its all about the power under the curve and how wide it is with a h pattern!

cheers

darren

  • Like 2
On 9/22/2016 at 1:45 PM, khezz said:


So what would be your recommendation for cams. For the type of setup discussed in this thread. 2.6l, e85, 750-800hp turbo. Going for 500kw at all fours?

mine made 500kw on JEM's dyno with just a set of HKS drop in 256 cams 8.7mm lift

the problem with going bigger lift is the costs start to go up cause you need to mess around with the head even more

i was actually very surprised the cams didnt 'hold back' power as I was originally told go with 272 cams

JEM told me - lift makes power - duration moves the power up and down the rev range...

  • Like 1

Agree totally ^^

People are too quick to throw big lift/duration cams in these days to the point of even making up custom high lift/low duration and bashing the valve train unnecessarily when there is more important things to sort out.

Ive made 5540wkw on a portedhead with 256 9.5mm kelfords (basically poncams)  Smart money gets spent where the greatest gains per dollar are first [emoji16]


What's does your fuel system consist of, if it's not a secret?

What's does your fuel system consist of, if it's not a secret?

Fire hose style lines and had to eliminate the injectors all together as they were providing a restriction just straight fuel line in the intake manifold does the trick for this bad boy
On 9/18/2016 at 8:37 PM, khezz said:

I should point out that this is not regarding any particular car. Just want to see experienced people's views. It seems that high mount twins are dead as dead can be. Low mounts are old tech.

My car will be getting a pair of low mount Gtx units. In search of 450awkw. The cost of engineering papers puts a high mount single out of reach.

so do you want feelings or factual numbers? because depending on a few factors their result will probably vary from yours.

I suppose numbers would be more useful. Different drivers will describe feelings differently. I have now been forced to go the single turbo rout. Going for the precision. So numbers would be great.

Holy, phone typo induces mass hysteria!

We were all very impressed and kinda worshipped you for a while. Thanks for ruining it.

So what sort of fuel system are you running. Fuel pump and injector size? Please
  • Like 1

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

    • Check the injectors flow evenly, and are actually flowing what you and the ECU think they should be flowing. If it's starting up on starter fluid, you have a fuel issue. Is it possible under cranking your fuel pump is turning off?   The harness you replaced, is that the whole engine harness? Do yourself a test, and drop the old harness on and plug it into the Z32 ECU. It's possible they've wired things different. From memory S1 to S2 is different in RB25 and you may have a wrong loom
    • I haven’t pulled the injectors to watch them spray yet but they are clicking from the cas and all of the spark plugs are wet with fuel. I’ve thought the cylinders were being flooded from the beginning and was hoping fuel pressure would fix it. Tonight I am going to pull the rail and watch the injectors spray. Don’t know how to test/diagnose if the plugs are firing in correct sequence but that should be a timing thing and as far as timing goes my car still has the half moon for the cas can only install it 1 way. And my mechanical timing is 100% correct I posted photos above. Confirmed with the balancer on and off. 
    • I checked spark on all cylinders and they all visually have spark with the plug pulled and grounded, but plug 1 is the only one that fouled. This was a running swap that blew up and was rebuilt by a machine shop, put a new wiring specialties harness and did all gaskets, studs, and bolts while it was out.  compression is 135-150 across all cylinders. Aside from that from my understanding with the z32 ecu and maf the car should start regardless. The wiring for TPS and the dual 02 sensor/ dual knock sensor stuff shouldn’t actually stop the car from starting or even running well, (just slightly rich)  they just give fault codes. Car supposedly is supposed to start as long as you have z32 afm and ecu with the nistune base map and that’s info coming from a well known and trusted tuner who does a lot with SR/RB (Rsenthalpy). After more trouble shooting today where I’m at right now is that the cas is sending signal to the injectors they click while spinning the rotor, Fuel pressure is now set at 43psi, all cylinders have good compression and all of the plugs looked great (just wet with fuel) except for cylinder 1 which was very black (cylinder 1 has 150psi compression). all of the coils generate spark if pulled out and grounded out on the head. On the fuel pump car just pops into the exhaust. On starting fluid car will fire off. Hard to tell if all cylinders are firing off but definitley a couple. sounds like all of them but it’s only for 3-5 seconds hard to tell. 
    • Final update!!! Got the front bar fitted and sprayed and all sorted now. My cutouts worked great and the indicators aren’t just falling off. 😂  
×
×
  • Create New...