Jump to content
SAU Community

Recommended Posts

You could use a dremel it might make it easier in places. I just used 400 grit wet and dry then 800, then used a combination of polishing wheels finally finished off with autosol... came up ok... I'm not looking for ward to doing the plenum though... I did the cam covers the same way, came up mirror, but I'm now thinking I will paint them as having to maintain the shine of polished alloy is very time intensive...

You could use a dremel it might make it easier in places. I just used 400 grit wet and dry then 800, then used a combination of polishing wheels finally finished off with autosol... came up ok... I'm not looking for ward to doing the plenum though... I did the cam covers the same way, came up mirror, but I'm now thinking I will paint them as having to maintain the shine of polished alloy is very time intensive...

sounds good, do you have pics of the end result? i think it might save quite a bit for coin which could be better spent on food ^_^

You could use a dremel it might make it easier in places. I just used 400 grit wet and dry then 800, then used a combination of polishing wheels finally finished off with autosol... came up ok... I'm not looking for ward to doing the plenum though... I did the cam covers the same way, came up mirror, but I'm now thinking I will paint them as having to maintain the shine of polished alloy is very time intensive...

x2 would love to see how it turned out doing it urself

I don't have a decent camera but this is how the cam covers came out... it is really mirror like, they wern't too hard to do... just takes alot of time..

On the other hand the intake pipe and plenum take a lot more sanding to get it smooth but ends up the same, you do have to be careful to keep it smooth and not a wavy finish. When it is polished you will see distorted reflection. it would be easier to use a bench grinder with buff wheel attached..

I think I will just sand it smooth and paint all the polished bits a colour, maybe silver, as keeping the polished alloy nice and shiny takes time. My car is not a daily driver and it still needs a polish at least once a month to keep it looking great...

post-26316-1194508200_thumb.jpg

this really is a crap photo

Edited by 75coupe

fo the cross over pipe, get something a bit more aggressive to get it smooth before you hit it with wet 400 - 400 would take along time to get rid of the casting marks.

go all the way through to 1200 or 2000 for final run

try not to sand in the one direction the whole time either.

check out other tips in the polishing post within the fabrication section.

  • 3 weeks later...

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

    • Harness is for a s1 Rb25det, and it is engine and lower harness.  the old harness had broken off plugs and was in very rough condition/exposed wires and splices etc. it is not able to be put back on the car, I could visually inspect to see if they had rewired any pins on the ecu plug. The fuel pump definitly isn’t turning off it’s an external pump and very loud you can hear it. Will look at the other harness tonight, am also going to pull the fuel rail and watch the injectors spray, will update here with what I find. Pretty sure at this point it has to be something to do with injectors because car will fire up on starting fluid and cas is clicking the Injectors. Fuel pressure is steady 43psi 
    • 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. 
×
×
  • Create New...