Apexi Knock counter showing knocks on idling, any ideas?

Simmo

Simmo

Member
My Apexi-safc on the R is showing Knocks (KNK on apexi) ranging from 2-12 on idle but on normal driving the knock count remains at 0 (with and without boost). The Knock sensor is the original one. Using optimax fuel and car has been set up for optimax. New engine so I wouldnt have thought there would be many carbon deposits.

Has anyone seen this or know what it could be?


Cheers, Simmo
 
A

AJ4

Guest
could possibly be a heatshield rattling ? or just caused by the ignition advancing / retarding to keep the idle speed. I wouldn't worry about it bro.
 
Simmo

Simmo

Member
The idle speed is pretty irratic due to the cams so I think you could be right mate, I need to get the car dyno'd properly so I'll check the heatshield out while im at it


Cheers Simmo
 
L

LeeSmith

Member
do you have a top mount? as if there is a few bolts missing, or it's not cushioned then it will rattle on the engine causing the "knock" that the sensor pics up 8)
 
Simmo

Simmo

Member
Nah, fmic but thanks for the info, something worthwhile knowing :)

I've posted the full spec of the car in the Members R's section so if anyone gets a sec have a read through and let me know if any of the components can cause this


Cheers guys
 
L

LeeSmith

Member
just incase people can't be arsed to go have a look mate...
Simmo said:
Pics to come shortly (when I finally get home from this stupid hotel!)


1991 H Plate ripped apart and rebuilt!


- Spanking new engine block from Nissan

- HKS forged 86mm pistons
- HKS vernier pulleys
- HKS 2.0mm head gasket
- HKS valve springs
- Kent 284 cams
- Ported, Gas flowed and polished head
- Ported and flowed exhaust manifold
- Lightened and balanced crank
- Shot peened rods
- MD214 turbo
- Fidanza 4.5kg alloy flywheel
- AP Paddle clutch with support bracket
- Dakar box rebuilt and shot peened
- Forge fmic
- Usual Samco's everywhere!
- Bailey Evo dump valve
- Mongoose full Exhaust System with 5" small animal swallowing tail
- HKS Iridium plugs
- K&N filter
- Walbro fuel pump

- Hi-Spec 285 big disc conversion kit
- Ace 17” alloys
- Polly flex bushes
- Nismo Suspension kit

- Turbo timer
- Washer bottle relocated to the boot
- Air con removed
- Blitz SBC spec R boost controller
- Apexi SAF-C2
- HKS 2.0bar boost gauge


Mods to come very shortly:

- Replace Nismo springs with Whiteline/Tein as problematic
- Mocal 16/19 row oil cooler
- Water Injection
- Bigger injectors
- Better ECU
- Bump Steer kit, Strut Braces, Anti Lift Kit blah blah
- Seam Weld frame

- Maintenance - New Struts, Master & Slave cylinder, Clips and stop those bl00dy hoses from exploding off on >1bar boost!



What do you reckon and can you suggest any other mods?


Cheers, Simmo
Click to expand...
 
S

Shaun

New Member
:D Hi mate,i wouldnt panic as long as it goes as soon as you flick the accelerator,you will find that it hasnt been calibrated propely on the initial setup :wink:
 
Simmo

Simmo

Member
Phew, cheers guys.

I'll have a play with the Apexi this weekend. The car needs re-setting up anyhow so hopefully it will cure it.


Cheers again, Simmo
 
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