Jump to content
SAU Community

Recommended Posts

  • Replies 130
  • Created
  • Last Reply

Top Posters In This Topic

Originally posted by whatsisname

I don't know the full details yet. I'll let you know when I do.

Reason I say this Matt is because AFAIK the Microtech doesnt have individual cylinder fuel trim control, hence 6 would be running the same pulsewidth as 5 and as 4 etc. etc. As for air distribution in an RB manifold? Generally 6 will receive LESS air than cyls 2 and 3, making it inherently richer. You will more than likely find that 6 has been running physically hotter than the other cylinders, due to the Skyline cooling system design, which has pushed it over the detonation threshold. Ie. it detonated to death, rather than 'leaned out'. I may well be wrong though.

Yep your right mate, the LT12 doesn't have individual cyl control. What you've explained, re 6 running hotter & leading to failure, sounds quite feasible. I'll post up the exact findings when the motor is apart.

Could the cause be a high pressure drop across the factory fuel rail and therefore no. 6 injector gets less fuel pressure and may have pushed it over the safe AFR edge? I would say the harder you push the fuel pressure, the greater the pressure drop.

Martin, what ECUs has individual injector control? Have you seen high pressure drops across RB25 fuel rails?

I've seen on a number of tune shop designed items, the fuel feed line is in the centre of the rail, thus ensuring more even fuel delivery for each injector.

I will be thinking serously about a better fuel system when I bolt a bigger turbo on I think (as per Martin's HPI story some time back re RB25 injectors). Either straight fit SARD or new/better rail with whatever injector we come up with.

Sorry for hijacking thread, should be in Matt's rebuild thread!

Hang on guys, the problem with Whatsisname's motor was nothing to do with the Microtech.

I just asked, what other ECUs have individual injector control?

What if it did, how would you measure AFRs for each cylinder anyway?

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

    • This looks great! Awesome to have the 5 speed with an LSD in this. The Recaro's look like SR2's or SR3's. It's a shame they've been retrimmed as they would have looked sweet in their original colours. I think I'd want my agent to be a little more up front and informative too. I've never imported but I reckon it would make me a little nervous, so the more info the better.
    • Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
    • My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
×
×
  • Create New...