first startup after engine build, no exhaust is this OK? any suggestions or tips?

[R32GT-R]

I am starting my new engine for the initial idle and 2000 rpm idle breakin and setup. is it OK to run it with just the down pipe on, i.e.. no exhaust. will this reduction in back pressure hurt anything. it will still have some, just not as much as it would with the exhaust on.

any tips?

[Skym]

Louder, might be harder to start (use throttle), A/F ratio might be affected due to narrowband or wideband o2 sensor is close to exhaust exit (I think more oxygen / o2 = lean), if on stock type of downpipe only. Also can't run wideband back enough in frontpipe to get accurate reading (less turbulence), as there isn't a frontpipe to put it into.

At least fill turbo or turbo's with oil, so don't dry start. Dry start can cause early turbo failure.

If have new cams, cam break in procedure -

http://www.camshaftshop.co.nz/index.php/Camshaft-Information/flat-tappet-break-in-procedure.html

It mentions filling crankcase with oil.

[R32GT-R]

great article thanks...

[MKIV]

Great info.

[R32GT-R]

it went good, video in my build thread, tomorrow i will take it for a drive if time permits

[NismoS-tune]

it went good, video in my build thread, tomorrow i will take it for a drive if time permits

Wait, what? You didn't drive it the first time your started it? tisk tisk tisk. I guess we all break in differently, are you going with an easy break in?

[R32GT-R]

i kept revs cycling between 2000-3000 rpm , AFR at 14-16 for 15 mins to break in my cams, mate buckets to lobes.

next time it starts it will be semi aggressively run for 100 or so kilometres up to 6500 rpm's.

than its tuning time.

[Dakota_gsx]

Louder, might be harder to start (use throttle), A/F ratio might be affected due to narrowband or wideband o2 sensor is close to exhaust exit (I think more oxygen / o2 = lean), if on stock type of downpipe only. Also can't run wideband back enough in frontpipe to get accurate reading (less turbulence), as there isn't a frontpipe to put it into.

At least fill turbo or turbo's with oil, so don't dry start. Dry start can cause early turbo failure.

If have new cams, cam break in procedure -

http://www.camshaftshop.co.nz/index.php/Camshaft-Information/flat-tappet-break-in-procedure.html

It mentions filling crankcase with oil.

I just used lots of assembly lube with cams when i built my motor last year,
And before you fire it up for the first time, disconnect the fuel pump fuse, and turn the motor over a bunch to get the oil pump pushing oil through the engine and parts.
Or in my case, flow it out the oil gallery where i should have put a plug in

[NismoS-tune]

I just used lots of assembly lube with cams when i built my motor last year,
And before you fire it up for the first time, disconnect the fuel pump fuse, and turn the motor over a bunch to get the oil pump pushing oil through the engine and parts.
Or in my case, flow it out the oil gallery where i should have put a plug in

You know, by disconnecting the fuel pump fuse, you'll still get some fuel squirted in the engine. That's why we disconnect the CAS instead no injection happens.

[Dakota_gsx]

You know, by disconnecting the fuel pump fuse, you'll still get some fuel squirted in the engine. That's why we disconnect the CAS instead no injection happens.

This is on original build though. My fuel rail was taken out during the build, guess i should have specified that. But unplugging the CAS definitely sounds smarter. Thanks!