Jump to content
SAU Community

Recommended Posts

Hey,

My r34 recently developed a hesitation around 5krpm to around 5500rpm and I believe it is most likely the afm. Is there anyone in Brisbane area that has a spare afm or working one that I can test to see if this is definitely the problem? Let me know would like to confirm the issue asap should be a 6 pack in it for whoever helps.

Thanks

Link to comment
https://www.sau.com.au/forums/topic/366852-afm-help/
Share on other sites

Usually if its a coil pack you can see the damage...

It will fire the spark out the side of the pack to the cylinder head, leaving a "char" mark on the side of the coil pack...

Its easily spotted on the dyno with the lights off, its like a lightning storm under load at 5000rpm...

Just check the plugs and as you pull the coil packs inspect them closely...

A set of platinum plugs will set you back over $100, a set of new coil packs I think are still about $500-$550ish...

Here is way old-school thread i did where I had the same problem on the dyno --> http://www.skylinesaustralia.com/forums/topic/116653-a-day-with-matt-spry/page__hl__matt+spry

Link to comment
https://www.sau.com.au/forums/topic/366852-afm-help/#findComment-5853376
Share on other sites

Usually if its a coil pack you can see the damage...

It will fire the spark out the side of the pack to the cylinder head, leaving a "char" mark on the side of the coil pack...

Its easily spotted on the dyno with the lights off, its like a lightning storm under load at 5000rpm...

Just check the plugs and as you pull the coil packs inspect them closely...

A set of platinum plugs will set you back over $100, a set of new coil packs I think are still about $500-$550ish...

Here is way old-school thread i did where I had the same problem on the dyno --> http://www.skylinesaustralia.com/forums/topic/116653-a-day-with-matt-spry/page__hl__matt+spry

Thanks for that mate. I have heard most people don't bother with platinum and actually prefer using copper plugs and replace them more often.

Haha that thread is awesome epic story man definitely a top rap for Matt Spry also never heard of a shop doing something like that for a customer

Link to comment
https://www.sau.com.au/forums/topic/366852-afm-help/#findComment-5855482
Share on other sites

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

    • Hi Apex and welcome! 
    • Probably too late to reply to this, but worth a try. It's not calliper flex, the calliper as a whole is moving so it has to be calliper mounting bracket flex.  Calliper mounting brackets are designed to stop the calliper rotating, they don't need to be designed heavy duty to stop the calliper moving in and out.  Whatever it is is not the major cause of poor pedal feel, the outer pistons are moving towards the disc rotor the same amount as the inner pistons are moving away from the disc rotor.  Hence no change in fluid usage, what extra fluid is needed to move the outer pistons is recovered from the inner pistons. For a calliper to move as a whole by far the most common reason is the rotor is not perfectly centred in the calliper.  The first thing I check is that hub face is perfectly clean, bare metal, where the rotor hats contacts it.  Then I check the that rotor is firmly held in place by at least 3 wheel nuts (or equivalent). If all of the above are confirmed to be in perfect alignment then I would check the piston sizes and ensure that the 3 inner pistons and 3 outer pistons have matching diameters (eg; 28/32/36mm).  I have seen a no name 4 spot calliper that had 1 of the 4 pistons a different diameter. Maybe I missed it, are both the callipers exhibiting the same problem? I would remove the transfer pipe and inspect it to make sure that there are no restrictions. Maybe you already have but if not I would return them with the video and have them confirm all of the above.   Hope that helps Cheers Gary    
    • If you have the original log book and it didn't have a chassis number quoted, then no money required.  I have "rechassied" a number of race cars, no problem as long as you have the original log book.   Cheers Gary
    • Well the good news is that it won't run any worse with an atmo bov than it does with no bov, I've owned a few Nissans over the years (r32, s15 and now r33), the stalling issue caused by a bov or no bov while still having an afm is easy enough to live with, most people get used to driving them and just feathering the throttle when you come to a stop to avoid it stalling. Changing to a proper ecu with a map sensor is ideal but in the short term I'd just slap in the bov if you really want the whoosh sound. I looked into the pass through type maf like the R35 one above but decided against it as the amount of oil and crap flowing through the hot side would mean you'd have to clean it often to keep it working.
×
×
  • Create New...