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300hp to 400hp upgrade

Old 07-11-2018, 09:03 AM
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How do you know how much octane you need?
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Old 07-11-2018, 09:10 AM
  #242  
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What does your knock sensor say?
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Old 07-11-2018, 09:23 AM
  #243  
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Lets try this a different way. What octane were you running at what boost level (and which turbo again)? Even with good gas, timing is a thing, post your timing table.
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Old 07-11-2018, 09:48 AM
  #244  
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If i have a turbo, i run the highest octane available.

And then tune for it.
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Old 07-11-2018, 11:13 AM
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Old 07-11-2018, 11:29 AM
  #245  
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What's the price difference between a tank of higher octane fuel and an engine?

Asking for a friend.
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Old 07-11-2018, 11:37 AM
  #246  
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Originally Posted by sixshooter View Post
What's the price difference between a tank of higher octane fuel and an engine?

Asking for a friend.
Roughly the price of engine minus a cheap spark plug
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Old 07-12-2018, 12:03 AM
  #247  
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Yikes.
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Old 07-12-2018, 07:26 AM
  #248  
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I run 95RON, wanted to tune for low octane for the power level it will allow - higher octane here is a problem.


- I suspect something is wrong with the base timing - I run MS3 Basic and offsset on the ecu came out -13deg I do not know if it is true TDC... Could be the marking on the ATI are not true TDC of the engine.\ (I read that sevington showed the center mark on the ATI does not match the timing gear)
- After a few hundred km running with no boost I started tuning for boost, I noticed the boost run very linear upto 20psi @ redline.

This is the ignition map that came with the ecu:

MS3 Basic base map
I run this ignition map thinking it is very low, less then 10deg @ 200kpa...

Well, I wanted to check why the boost is so linear so I did run upto 20psi~ (linear) at redline... a few times, the afr was 11.5-12 all the time, I did not have my knock sensor earphone on :\ - no audible knock from the driver sit.
After those runs the engine start showing blow by - I believe it was hurt,

Another small thing:
My ignition setting was:
Rising edge on 99-05 Spark mode, I understand from Dimitrious that it should be Falling edge ...( it run ... what does it effect ?)

Thanks for the input guys.
Elior
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Old 07-12-2018, 07:34 AM
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Leading edge versus trailing edge could be worth several degrees of timing. It would make it advanced.
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Old 07-12-2018, 07:53 AM
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My lesson is:
- Find TRUE TDC and true tdc offset - base timing.
- Correct timing settings
- start with low timing in boost
- low boost to start with
- tune with my expensive knock sensor on
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Old 07-12-2018, 08:10 AM
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95 RON is generally considered to be about 90 (R+M)/2, which is the American standard of measurement.
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Old 07-12-2018, 09:11 AM
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Originally Posted by sixshooter View Post
Leading edge versus trailing edge could be worth several degrees of timing. It would make it advanced.
So does this stay true even if the base timing is set using Rising? I just looked at my tune, set up spark three years ago and it is also set on rising. wondering if I have been close to meltdown.
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Old 07-12-2018, 09:23 AM
  #253  
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Base timing is very important. When I throw boost at a motor, I physically verify it with a dial indicator, if the motor allows it.
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Old 07-12-2018, 09:40 AM
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na, what I am asking is: if I am on rising edge and set base timing, is my ignition going to be more advanced in boost than if I do the same with Falling edge?
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Old 07-12-2018, 09:57 AM
  #255  
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The head is dead the block is good.

Can I use a non VVT head on VVT block ?...
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Old 07-12-2018, 10:14 AM
  #256  
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why not?
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Old 07-12-2018, 10:19 AM
  #257  
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Old 07-12-2018, 10:34 AM
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Out of curiosity, do you have a log of when this happened? What were the specs for the block and head? Was it a stock vvt head? Any idea where in the range the vvt was?

Looks like this happened at 2 pistons, correct?
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Old 07-12-2018, 10:42 AM
  #259  
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all 4, vvt was disabled...
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Old 07-12-2018, 11:12 AM
  #260  
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wowww
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