Jump to content
SAU Community

Microtech Help On Rb25Det

the_jack

By the_jack,
in Engines & Forced Induction

 Share

Recommended Posts

the_jack Enthusiast

the_jack

Posted
Posted

G'day

I have purchased a Microtech LT12S for my RB25DET, however it is set up with an rb30et base tune. I have rung up Microtech and they said all I have to do to run it on the RB25det is chance the cas settings. So the question is, how do I do this? I just have to finish some wiring on the engine loom and the engine should run. I want to have the engine running on the base map and have everything 100% ready before it goes to get tuned so there are no problems once it hits the dyno.

Any help would be much appreciated.

Cheers

Link to comment
https://www.sau.com.au/forums/topic/431278-microtech-help-on-rb25det/
Share on other sites
the_jack Enthusiast

the_jack

Posted
  • Author
Posted (edited)

Yeah iv already done that and changed the wiring to suit. Now i just need to change the settings in the ecu as the Rb30et only runs a single coil instead of 6 coils.

Also, how do I wire up the vct? just use the AUX output off the LT12 to trigger a relay to give power to the solanoid? Im assuming I can just ground one side of the solanoid and then give it 12v + through the other side through a relay?

cheers

Edited by the_jack
PSI086 Community Regular

PSI086

Posted
Posted

I'd just bin it and buy a decent ecu. I just finished wiring a lt12s up on a 25/30 and it was the most outdated piece of shit I've ever tried to use. VCT won't be enabled as its set up for a RB30 and you can't configure the outputs yourself, which means sending it back to microtech and paying them money to change stuff which you can do with the click of a button in any other ecu. Unless you are prepared to throw good money at something that has the technology of a commodore 64 for a reconfigure, you would be better off selling it and going with something else. We even had to send my mate's back to get a thermo fan output added which is just a joke

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Chupapy
      Help! Leak coming under transmission

      By Chupapy · Posted

      Yes will do mate
    • GTSBoy
      Help! Leak coming under transmission

      By GTSBoy · Posted

      Get an inspection camera up there. 
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      Yeah, but look at the margin in viscosity between the 40 and the 60 at 125°C. It is not very large. It is the difference between 7 and 11 cP. Compare that to the viscosity at only 90°C. The viscosity axis is logarithmic. The numbers at 90 are ~15 and ~35. That is about half for the 40 wt oil and <half for the 60. You give up viscosity EXPONENTIALLY as temperature rises. Literally. That is why I declare thicker oil to be a bandaid, and a brittle one at that. Keep the oil temperature under about 110°C and you should be better off.   Having said all of that, which remains true as a general principle, if you have indeed lost enough oil from the sump that the pump was seeing slightly aerated oil, then all bets are off. That would of course cause oil pressure to collapse. And 35 psi is a collapse given what you were doing to the engine. Especially if the oil was that hot and viscosity had also collapsed. And I would put money on rod or main bearings being the source of the any noise that registered as knock. Hydraulic lifters should be able to cope with the hotter oil and lower pressure enough to prvent too much high frequency noise, although I am willing to admit it could be the source.
    • Chupapy
      Help! Leak coming under transmission

      By Chupapy · Posted

      Thanks for the reply mate. Well I really hope its a hose then not engine out job
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      But.... the reason I want to run a 60 weight is so at 125C it has the same viscosity as a 40 weight at 100C. That's the whole reason. If the viscosity changes that much to drop oil pressure from 73psi to 36psi then that's another reason I should be running an oil that mimics the 40 weight at 100C. I have datalogs from the dyno with the oil pressure hitting 73psi at full throttle/high RPM. At the dyno the oil temp was around 100-105C. The pump has a 70psi internal relief spring. It will never go/can't go above 70psi. The GM recommendation of 6psi per 1000rpm is well under that... The oil sensor for logging in LS's is at the valley plate at the back of  the block/rear of where the heads are near the firewall. It's also where the knock sensors are which are notable for 'false knock'. I'm hoping I just didn't have enough oil up top causing some chatter instead of rods being sad (big hopium/copium I know) LS's definitely heat up the oil more than RB's do, the stock vettes for example will hit 300F(150C) in a lap or two and happily track for years and years. This is the same oil cooler that I had when I was in RB land, being the Setrab 25 row oil cooler HEL thing. I did think about putting a fan in there to pull air out more, though I don't know if that will actually help in huge load situations with lots of speed. I think when I had the auto cooler. The leak is where the block runs to the oil cooler lines, the OEM/Dash oil pressure sender is connected at that junction and is what broke. I'm actually quite curious to see how much oil in total capacity is actually left in the engine. As it currently stands I'm waiting on that bush to adapt the sender to it. The sump is still full (?) of oil and the lines and accusump have been drained, but the filter and block are off. I suspect there's maybe less than 1/2 the total capacity there should be in there. I have noticed in the past that topping up oil has improved oil pressure, as reported by the dash sensor. This is all extremely sketchy hence wanting to get it sorted out lol.
×
×
  • Create New...