Jump to content
SAU Community

R34 Gtt Detonation

B-Boi34

By B-Boi34,
in Engines & Forced Induction

 Share

Recommended Posts

B-Boi34 Community Regular

B-Boi34

Posted
Posted

Hi Guys

I put my car on a dyno yesterday & was told its pinging right at the top of the rev range.

Its pretty much standard apart from exhaust, filter & boost controller which was set on 8psi for the run.

I suspect its pinging due to the timing being out. The fuel to air ratio was fine at 11.2 pretty much all along the rev range.

My question is can any one confirm if the plastic R34gtt bottom timing cover is different to the metal ones previously used on 32 & 33's.

The reason I ask is my plastic cover was removed because it warped & was hitting the pulley. It was replaced with a metal cover & im thinking if the metal cover's timing marks are different then my timing would be out.

Thanks in advance

Link to comment
https://www.sau.com.au/forums/topic/418872-r34-gtt-detonation/
Share on other sites
  • 2 weeks later...
B-Boi34 Community Regular

B-Boi34

Posted
  • Author
Posted

Ok so I put the car back on the dyno, the timing is set at 15 degrees btdc however it still pings right at the top of the rev range with any thing over stock boost.

In fact anything over 6psi. It appears by turbo/wastegate is stuffed as it will not hold boost. Starts at 8psi & drops to 6 but thats a different issue.

The tuner recommends I get a FMIC as im still running the factory SMIC.

Has any one had this problem before or have any idea what the problem could be?

Tonks Community Regular

Tonks

Posted
Posted

The SMIC wouldnt be too efficient at 12psi, fit the FMIC and go from there. You need supporting mods before start winding boost up. Have a look at the rb25 turbo/dyno result thread and see everyone elses supporting mods to get an idea

  • 5 months later...
B-Boi34 Community Regular

B-Boi34

Posted
  • Author
Posted

So just encase anyone finds themselves with the same issue it was the SMIC that was causing the detonation, apparently its not good for up to 200RWKW as iv read elsewhere.

FMIC fitted & no more detonation, it also gave me a 30rwhp increase.

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

    • Kapr
      RB20DE NEO smallbox clutch.

      By Kapr · Posted

      For once a good news  It needed to be adjusted by that one nut and it is ok  At least something was easy But thank you very much for help. But a small issue is now(gearbox) that when the car is stationary you can hear "clinking" from gearbox so some of the bearing is 100% not that happy... It goes away once you push clutch so it is 100% gearbox. Just if you know...what that bearing could be? It sounding like "spun bearing" but it is louder.
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      Yeah, that's fine**. But the numbers you came up with are just wrong. Try it for yourself. Put in any voltage from the possible range and see what result you get. You get nonsense. ** When I say "fine", I mean, it's still shit. The very simple linear formula (slope & intercept) is shit for a sensor with a non-linear response. This is the curve, from your data above. Look at the CURVE! It's only really linear between about 30 and 90 °C. And if you used only that range to define a curve, it would be great. But you would go more and more wrong as you went to higher temps. And that is why the slope & intercept found when you use 50 and 150 as the end points is so bad halfway between those points. The real curve is a long way below the linear curve which just zips straight between the end points, like this one. You could probably use the same slope and a lower intercept, to move that straight line down, and spread the error out. But you would 5-10°C off in a lot of places. You'd need to say what temperature range you really wanted to be most right - say, 100 to 130, and plop the line closest to teh real curve in that region, which would make it quite wrong down at the lower temperatures. Let me just say that HPTuners are not being realistic in only allowing for a simple linear curve. 
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      I feel I should re-iterate. The above picture is the only option available in the software and the blurb from HP Tuners I quoted earlier is the only way to add data to it and that's the description they offer as to how to figure it out. The only fields available is the blank box after (Input/ ) and the box right before = Output. Those are the only numbers that can be entered.
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      No, your formula is arse backwards. Mine is totally different to yours, and is the one I said was bang on at 50 and 150. I'll put your data into Excel (actually it already is, chart it and fit a linear fit to it, aiming to make it evenly wrong across the whole span. But not now. Other things to do first.
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      God damnit. The only option I actually have in the software is the one that is screenshotted. I am glad that I at least got it right... for those two points. Would it actually change anything if I chose/used 80C and 120C as the two points instead? My brain wants to imagine the formula put into HPtuners would be the same equation, otherwise none of this makes sense to me, unless: 1) The formula you put into VCM Scanner/HPTuners is always linear 2) The two points/input pairs are only arbitrary to choose (as the documentation implies) IF the actual scaling of the sensor is linear. then 3) If the scaling is not linear, the two points you choose matter a great deal, because the formula will draw a line between those two points only.
×
×
  • Create New...