Jump to content
SAU Community

Recommended Posts

anyone else here of an R35GTR from sydney that has lunched an engine?

Apparently lost the top of a piston & has damaged the block & several rods.

If this is true, someone has blown, literally, a lot of money. I can see the Nissan official line now..."Sorry; no warranty on grey or personal imports...". Maybe the thread on 35 engines in this section will heat up even further with ideas! (LTS Jayce now keeping one sceptical eye on the 'For Sale' section, LOL)

Link to comment
https://www.sau.com.au/forums/topic/243931-r35-gtr/#findComment-4249948
Share on other sites

I second that....

This does not bode well for Haltech's reputation...

I dunno. It depends on what they were doing at the time. If they were pushing the envelope, at least they now know where the limit is and what the motor doesn't like.

"Blowing stuff up and then pegging back the next one a notch" is probably a bit more popular a tuning method in America, given what I've seen with VQ35DE modification (it probably explains why Edison is considered their greatest inventor). A lot of manufacturers will stress test their mules and wait for something to break.

For example, Nismo found out that the conrod pins in a stock V35/Z33 VQ35DE could only handle around 7200RPM before they started to stretch, and they'd instantaneously snap at around 7800RPM. I can't see them figuring out those numbers without putting some pistons through some heads. It was the Americans who were probably the first to figure out that out the bottom end will only take around 300rwkW before the conrods snapped if you opted for non-natural aspiration, usually by aerating the side of the block.

Assuming they know why it failed, Haltech will be one of the few tuners that do. When it boils down to it, their GT-R is a test mule as well. Their car was never going to be sold on to a customer or be used as a daily driver.

From a regular person's perspective, it's better that they learn on their own car rather than a customer's. It's just unfortunate that's it's going to cost them a bucketload to get a new engine.

Link to comment
https://www.sau.com.au/forums/topic/243931-r35-gtr/#findComment-4253305
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

    • @Haggerty this is your red flag. In MAP based ECU's the Manifold pressure X RPM calculation is how the engine knows it is actually...running/going through ANY load. You are confusing the term 'base map' with your base VE/Fuel table. When most people say 'base map' they mean the stock entire tune shipped with the ECU, hopefully aimed at a specific car/setup to use as a base for beginning to tune your specific car. Haltech has a lot of documentation (or at least they used to, I expect it to be better now). Read it voraciously.
    • I saw you mention this earlier and it raised a red flag, but I couldn't believe it was real. Yes, the vacuum signal should vary. It is the one and only load signal from the engine to the ECU, and it MUST vary. It is either not connected or is badly f**ked up in some way.
    • @Haggerty you still haven't answered my question.  Many things you are saying do not make sense for someone who can tune, yet I would not expect someone who cannot tune to be playing with the things in the ECU that you are.  This process would be a lot quicker to figure out if we can remove user error from the equation. 
    • If as it's stalling, the fuel pressure rises, it's saying there's less vacuum in the intake manifold. This is pretty typical of an engine that is slowing down.   While typically is agree it sounds fuel related, it really sounds fuel/air mixture related. Since the whole system has been refurbished, including injectors, pump, etc, it's likely we've altered how well the system is delivering fuel. If someone before you has messed with the IACV because it needed fiddling with as the fuel system was dieing out, we need to readjust it back. Getting things back to factory spec everywhere, is what's going to help the entire system. So if it idles at 400rpm with no IACV, that needs raising. Getting factory air flow back to normal will help us get everything back in spec, and likely help chase down any other issues. Back on IACV, if the base idle (no IACV plugged in) is too far out, it's a lot harder for the ECU to control idle. The IACV duty cycle causes non linear variations in reality. When I've tuned the idle valves in the past, you need to keep it in a relatively narrow window on aftermarket ecus to stop them doing wild dances. It also means if your base idle is too low, the valve needs to open too much, and then the smallest % change ends up being a huge variation.
    • I guess one thing that might be wrong is the manifold pressure.  It is a constant -5.9 and never moves even under 100% throttle and load.  I would expect it to atleast go to 0 correct?  It's doing this with the OEM MAP as well as the ECU vacuum sensor. When trying to tune the base map under load the crosshairs only climb vertically with RPM, but always in the -5.9 column.
×
×
  • Create New...