Cold air intake box

[jonbills]

if the trigger angle is configured 10° out, the timing would report 10° out acoss the range. all works fine, but if you command 34° advance but the config error means thats really 44°, then it'll knock and you'll retard to 22° and wonder why.

 

[Turn & Burn]

The ignition timing has been set by the technician to a avoid knock, whether there’s an error in sensor location which results in a reading of 22 rather than 34 it wouldn’t explain the drop off in power?
The knock maybe a product of high 11:1. compression and poor burn with that head design so compensating for the knock is killing the motor?
As the motor drops off so early could it be a retarded cam?

 

[Alphabettispaghetti]

if the trigger angle is configured 10° out, the timing would report 10° out acoss the range. all works fine, but if you command 34° advance but the config error means thats really 44°, then it'll knock and you'll retard to 22° and wonder why.

That makes sense, its got to be timing/timing related somewhere. Unless the injectors are max chat

 

[SeanDezart]

Thanks chaps.

Had an exchange with Jenvey who said that my current injectors are 350cc and that they also offer 550cc.....but 350cc per cylinder is surely enough - no ?

Looks like I may be switching rolling roads in the New Year under the auspices of my friend, Daniel Valinho up near Paris..... A/F and all the frills !

Anymore thoughts are welcome, I'll be reporting back in with any news. So as not to upset the mods and stay on subject - he and I'll be working on a cold-air intake and biggest airbox we can fit between rad support-panel, BMC, trumpets and inner wing AND the chassis rail to bonnet....30litres is the target but 20'll do !

 

[Turn & Burn]

According to the charts a 350cc injector on a 6 cycl motor should get to 360bhp at 3bar. Did you check fuel pressure?

 

[SeanDezart]

Thanks - for me to check, Martin of MZR restored and prepared the car so should know what he's doing.

 

[Mark N]

According to the charts a 350cc injector on a 6 cycl motor should get to 360bhp at 3bar. Did you check fuel pressure?

That seems to be the general rule of thumb in Skyline circles that the injector size on a 6 cylinder at 3bar base fuel pressure is the maximum power they will support.
i.e. 550cc = 550BHP

 

[Alphabettispaghetti]

Thanks chaps.

Had an exchange with Jenvey who said that my current injectors are 350cc and that they also offer 550cc.....but 350cc per cylinder is surely enough - no ?

Looks like I may be switching rolling roads in the New Year under the auspices of my friend, Daniel Valinho up near Paris..... A/F and all the frills !

Anymore thoughts are welcome, I'll be reporting back in with any news. So as not to upset the mods and stay on subject - he and I'll be working on a cold-air intake and biggest airbox we can fit between rad support-panel, BMC, trumpets and inner wing AND the chassis rail to bonnet....30litres is the target but 20'll do !

I wouldn't get too caught up in airbox size. I think an e36 m3 is about 14ltrs. thats over 100bhp N/A

 

[status]

Those injector sizes you have Sean baby should be sufficient

 

[SeanDezart]

I wouldn't get too caught up in airbox size. I think an e36 m3 is about 14ltrs. thats over 100bhp N/A

Funny you should mention that - we had one on our hands and slipped in in an engine bay to see...

Yes Paul, I agree - either as it was suggested (by Franky ?), the injectors are not at 'max-power' OR there is a whopping timing issue !