what happens if you run past 10psi on ghettodyne?
 

so the original chip only reads to 9.5 psi. what happens if you go past that, say 10-12 psi?

what do the ignition maps and fuel tables do? im starting to think this is why my engine blew up...help me clear things up.

Re:what happens if you run past 10psi on ghettodyne?
 

im un-fimiliar w/ ghetto dyne but if the fuel map is only for 9.5 psi and you are boosting 11psi the car wont have the right fuel so i would imagine it would stick w/ that 9.5psi fuel column and that would be way to lean. If you richen up the 9.5psi column and run 10psi...you would be fine...but 11 or 12 psi...it would be terrible.

Thats the way i understand it atleast. im probably wrong. but i know that if you are boosting 11-12psi you are going to be very lean

-bignig

Re:what happens if you run past 10psi on ghettodyne?
 

11-12psi looks like 9.5 psi on the stock MAP sensor. Even more than ghettodyne it is your MAP SENSOR!!! that is the problem.

as bigwig said, go past the limit of the stock MAP sensor and you will go lean. The ECU can't detect any changes past the limit of the sensor so it provides fuel and timing for less boost than is there.

If you don't richen / retard your last column for the overboost condition, you're going to blow ---- up sooner or later.

Re:what happens if you run past 10psi on ghettodyne?
 

so that would explain why my engine lasted 2 days...? i blew all the ringlands. im guessing it got pretty hot and detonated quite a bit?

Re:what happens if you run past 10psi on ghettodyne?
 

How long were the pulls you were doing? I still find it hard to believe that this happened. You say you went to 10 maybe 11? Unless you were boosting 11psi for a long period of time this should not have happened, especialy if the map was rich at 9.5psi. It might have leaned out a bit over the safe zone, but to blow the ringlands is just crazy. Doesn't the stock sensor read to around 11.xxpsi? Wouldn't that allow the GD to compensate for fuel up to 11.xxpsi?
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Re:what happens if you run past 10psi on ghettodyne?
 

i was hardly in 10 or 11psi. as soon as i saw it i left off or shifted. the engine was strong, very strong, when it was not turbo, hell it was strong when it was turbo.

during the turbo install, i poped the vavle cover to tighted the head bolts a bit tighter than stock. i found some didnt seem to be torqued to proper stock specs and one rocker arm bolt was loose (the bolts that hold down the assembly)

and it's not like i just cracked the ringlands, i cracked peices of them from the piston. but the rings themselves looked perfect!

maybe i got a shitty batch of pistons or something?

Re:what happens if you run past 10psi on ghettodyne?
 

That would be my guess.

You got any pics of the damage?
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Re:what happens if you run past 10psi on ghettodyne?
 

http://www.imagestation.com/picture/...3.jpg.orig.jpg
http://www.imagestation.com/picture/...a/fa247f23.jpg

might be easier to view in the large version in the link above the picture.

that was #4 piston. im 80 miles away from my car/pistons/camera right now, so i cant do any better at the moment.

Re:what happens if you run past 10psi on ghettodyne?
 

stock OBD0 reads to 9.5psi or so.
stock OBD1 sensor might read 0.5 psi higher.
past the max reading, no more fuel.
no more fuel + much more boost = lean
lean = boom
the end.

Re:what happens if you run past 10psi on ghettodyne?
 

so, my engine blew because it went lean and got too hot, and the ringlands went?


i just want to make sure i know exactly why the engine blew before i try this again.

alot of people say ringlands = detonation. which would be ignition related. but the lean condition makes more sence to me. if it gets too hot in the cylinders the ringlands will break?