Winners Guide To Winning: The Most Cost Effective Upgrade for your Turbo Miata
09-22-2011, 05:48 PM
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Sixshooter22nd September 2011 17:45Quote:
Originally Posted by MiataMTF (Post 5333593)
Probably Scenario #3 followed by #1
I agree. You probably need a coolant reroute to give you more even cooling across your engine. Number four is always the most sensitive and first to go.
Quote:
Originally Posted by bigblue (Post 5334312)
Those multiply ground plugs are kind of a racket. The point is to uncover the spark not to hang more metal around to break off and give carbon something to hang on to. Stick with the NGK stuff.
Absolutely agree. This is why in competitive racing with wedge shaped combustion chambers it is considered important to index your spark plugs. The less shrouding around the spark kernel, the better.
Quote:
Originally Posted by tom4416 (Post 5340527)
Detonation starts before it's audible to the human ear sitting in the cockpit,
Absolute truth.
Quote:
Originally Posted by tom4416 (Post 5340527)
#4 cylinder tends to run hotter anyway
Also the truth, unless you spend a few minutes installing a coolant reroute.
Quote:
Originally Posted by tom4416 (Post 5340527)
unfortunately, one wideband stuck at the end of the collector only tells you that your total is acceptable when in fact, three cylinders may be rich and one lean to get you the aggregate total reading.
Also truth. And I always wanted individual EGT sensors for each cylinder for this reason.
Quote:
Originally Posted by eunos1800 (Post 5341186)
Spark plugs don't just fail like that.
I'm absolutely certain your getting detonation.
All because you can't hear it over the wind noise, SC whine, road noise, exhaust and engine noise doesn't mean you don't have it.
My advice is ditch the PCPro and go for a standalone like the MegaSquirt, Adaptronic, Hydra etc.
Yes, yes, yes, and definitely.
Quote:
Originally Posted by eunos1800 (Post 5341920)
Using det cans is undoubtedly the best method to tune and listen for knock, no doubt.
Build them for $25 or buy them for $60. You want them.
Quote:
Originally Posted by MiataMTF (Post 5378801)
The #4 cylinder may be running lean and/or hot which can cause detonation. As added insurance, I'd install a dual feed fuel rail and/or convert to a return fuel system. YMMV.
I don't buy the dual feed fuel rail as something that is needed. For pressure to be created in the rail, it fuel has to be restricted. If you put a gauge on either end of the rail it would read the same. The only ways this would not be the case would be if the rail was a very long and large amounts of drag were created by the fuel flowing from one end to the other, or if the fuel was thicker like syrup and drag was created. Gasoline is too thin and the diameter of the rail is too large and it's length too short for me to accept the dual feed as necessary. Especially when it has been documented ad nauseum that we have inherent imbalance in the factory cooling design.
Quote:
Originally Posted by elektron (Post 5378551)
Exactly the same damage of 4th piston like on my BP engine (2000 NB) after 2.000 miles of supercharged with FFS coldside kit also with PC PRO cards with 5th injector,coolant reroute,AEM uego wideband ,65/105 pulleys (10.5psi)
I didn't think this was possible with the FFS kit. Are you sure it wasn't a turbo? You probably need to edit this post before people start to realize there is a pattern here.
Quote:
Originally Posted by elektron (Post 5378551)
Why only 4th piston is damage ?
Because hot.
The fourth cylinder is the hottest cylinder unless you have reroute to help create more even cooling across the engine...
Quote:
Originally Posted by elektron (Post 5378551)
-PC PRO cards dont know accurate temperature of air in the intake manifold so time retard is not accurate
Really? That sounds like a pretty serious design flaw.
Wait a minute... That also means that they cannot alter fuel enrichment as the temperature changes? Holy cow! That sounds like a really dangerous device to run on a car.
Run a MegaSquirt, Adaptronic, Hydra, or AEM or something so you don't end up hurt. I remember 5th injector drivers were what people used back in 1986 over in Japan before there was anything else. That technology is very old now. And much better technology is very cheap. You don't use a home computer that was built the same as in 1986. Why would you use something like that for something as expensive as your engine? I'm confused by that.
The forums are for opinions and there are mine. I am really sorry for the op's situation. Best of luck from here on out.
Steve
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