Blew my motor today :(
Feb 21, 2012, 06:42 AM
#48
29psi on the stock turbo is pointless. It's not efficient past 26psi so you're just straining your internals without gaining any power. Bad tuner, bad!
Why on earth were you in 5th at 45mph? That's like 1500rpm isn't it? Have you ever looked at your engine load when you accelerate from low RPMs in 5th? They're sky high, and they stay there forever since you don't accelerate quickly. That can cause you to throw a rod even on a 100% stock setup.
Sorry, but it seems like you've done everything wrong
Why on earth were you in 5th at 45mph? That's like 1500rpm isn't it? Have you ever looked at your engine load when you accelerate from low RPMs in 5th? They're sky high, and they stay there forever since you don't accelerate quickly. That can cause you to throw a rod even on a 100% stock setup.
Sorry, but it seems like you've done everything wrong
2 main things.
-29psi
-that much load on your engine at such a low rpm not to mention your boost probably spiking to 29psi.
Think of it like this, your on a 24 speed mt bike, and try to start off in the 24th speed. Think about how much strain is on your chain. Very similar affect is what happend to your rods.
-29psi
-that much load on your engine at such a low rpm not to mention your boost probably spiking to 29psi.
Think of it like this, your on a 24 speed mt bike, and try to start off in the 24th speed. Think about how much strain is on your chain. Very similar affect is what happend to your rods.
Plus I don't think the OP ever said, 'yea I drive around at WOT *ALL* the time in 5th gear at 45mph.'
Feb 21, 2012, 06:55 AM
#49
Usually it's not the final event that sends a motor over the edge, but a series of conditions that weaken the motor over time until it's ready to let go from just about any trigger condition.
Usually I like to tune the Evo X's at 26 PSI tops on the Stock turbo because any more at lower RPM's below 4000 seems to be trouble on these engines. You can tune for zero knock and get mad torque which feels great but really is incredible stress when you hit 29 psi at the boost threshold in 4th and 5th gear. Because the boost tapers from 25 psi at 5500 down to 20 psi at 7000 anyways, you really don't lose any top end pull by running 26 psi peak boost, just some low end torque that won't be enjoyed anyways once you start rowing the gears during racing conditions since you will be between 5000-7000 rpm anyways. While that extra 3 psi might feel good coming out of a slow speed corner, the engines just don't like it all that much and it's not worth the extra risk in my book.
Hopefully you will figure out what to go with, Buschur has some nice options for rebuilds from 2.0L to the mighty 1BAMF 2.2L that we're dropping into Dr. Seto's Evo X for the 2012 One Lap event.
Usually I like to tune the Evo X's at 26 PSI tops on the Stock turbo because any more at lower RPM's below 4000 seems to be trouble on these engines. You can tune for zero knock and get mad torque which feels great but really is incredible stress when you hit 29 psi at the boost threshold in 4th and 5th gear. Because the boost tapers from 25 psi at 5500 down to 20 psi at 7000 anyways, you really don't lose any top end pull by running 26 psi peak boost, just some low end torque that won't be enjoyed anyways once you start rowing the gears during racing conditions since you will be between 5000-7000 rpm anyways. While that extra 3 psi might feel good coming out of a slow speed corner, the engines just don't like it all that much and it's not worth the extra risk in my book.
Hopefully you will figure out what to go with, Buschur has some nice options for rebuilds from 2.0L to the mighty 1BAMF 2.2L that we're dropping into Dr. Seto's Evo X for the 2012 One Lap event.
Last edited by Hiboost; Feb 21, 2012 at 07:00 AM.
Feb 21, 2012, 08:09 AM
#50
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Usually it's not the final event that sends a motor over the edge, but a series of conditions that weaken the motor over time until it's ready to let go from just about any trigger condition.
Usually I like to tune the Evo X's at 26 PSI tops on the Stock turbo because any more at lower RPM's below 4000 seems to be trouble on these engines. You can tune for zero knock and get mad torque which feels great but really is incredible stress when you hit 29 psi at the boost threshold in 4th and 5th gear. Because the boost tapers from 25 psi at 5500 down to 20 psi at 7000 anyways, you really don't lose any top end pull by running 26 psi peak boost, just some low end torque that won't be enjoyed anyways once you start rowing the gears during racing conditions since you will be between 5000-7000 rpm anyways. While that extra 3 psi might feel good coming out of a slow speed corner, the engines just don't like it all that much and it's not worth the extra risk in my book.
Hopefully you will figure out what to go with, Buschur has some nice options for rebuilds from 2.0L to the mighty 1BAMF 2.2L that we're dropping into Dr. Seto's Evo X for the 2012 One Lap event.
Usually I like to tune the Evo X's at 26 PSI tops on the Stock turbo because any more at lower RPM's below 4000 seems to be trouble on these engines. You can tune for zero knock and get mad torque which feels great but really is incredible stress when you hit 29 psi at the boost threshold in 4th and 5th gear. Because the boost tapers from 25 psi at 5500 down to 20 psi at 7000 anyways, you really don't lose any top end pull by running 26 psi peak boost, just some low end torque that won't be enjoyed anyways once you start rowing the gears during racing conditions since you will be between 5000-7000 rpm anyways. While that extra 3 psi might feel good coming out of a slow speed corner, the engines just don't like it all that much and it's not worth the extra risk in my book.
Hopefully you will figure out what to go with, Buschur has some nice options for rebuilds from 2.0L to the mighty 1BAMF 2.2L that we're dropping into Dr. Seto's Evo X for the 2012 One Lap event.
+1 you usually don't even feel that big torque hit unless you go around flooring it at 2k rpm
Feb 21, 2012, 08:34 AM
#51
Using too high of a gear is definitely a problem... You should be in 4th gear at 45-50. I don't think that was the only factor in this situation though.
That dyno graph shows how inefficient the stock turbo is at 29psi. Also, that's not a very smooth graph either.
OP: Good luck getting your car back on the road. If there's anything Vivid can do to help, let us know.
That dyno graph shows how inefficient the stock turbo is at 29psi. Also, that's not a very smooth graph either.
OP: Good luck getting your car back on the road. If there's anything Vivid can do to help, let us know.
Feb 21, 2012, 08:39 AM
#52
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I haven't dabbled with tuning X's yet, but is the problem that in a low RPM/high LOAD situation the ECU can't reference a correct part of the table or what? Can the car not account for low RPM/high LOAD situation? Excessive knocking? Can't be tuned out by adding fuel or pulling timing?
Feb 21, 2012, 09:18 AM
#55
I haven't dabbled with tuning X's yet, but is the problem that in a low RPM/high LOAD situation the ECU can't reference a correct part of the table or what? Can the car not account for low RPM/high LOAD situation? Excessive knocking? Can't be tuned out by adding fuel or pulling timing?
Feb 21, 2012, 09:33 AM
#56
I haven't dabbled with tuning X's yet, but is the problem that in a low RPM/high LOAD situation the ECU can't reference a correct part of the table or what? Can the car not account for low RPM/high LOAD situation? Excessive knocking? Can't be tuned out by adding fuel or pulling timing?
Feb 21, 2012, 09:56 AM
#57
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Feb 21, 2012, 10:06 AM
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One or a few people have had this problem before with the 4b11 motors, and there's a LONGG thread on here somewhere explaining the weakness of these motor, the rod bolts or something I think? One person did have the same issue though while just cruising in 5th also....I wanna say TTP engineering knows this problem to the T, the story I remember reading was a guy felt a loss of power so he did a compression test, found cyls 1 and 4? with low compression and the guys on here was saying thats ok nothing to worry about and ttp said pretty soon this and this is going to happen, everyone called bs, then later it happened just like ttp said. It's a common thing on these motors. I'll look for the thread later if I can.
Either way you should post the tuner and bring it back to them or tell them what happened, it was probably caused from the tune, maybe not happened when the car was in the shop but the more aggressive tune was the reasoning. I've seen lots of "Pro work" look like a 6 year old did it too.
Either way you should post the tuner and bring it back to them or tell them what happened, it was probably caused from the tune, maybe not happened when the car was in the shop but the more aggressive tune was the reasoning. I've seen lots of "Pro work" look like a 6 year old did it too.
Feb 21, 2012, 11:03 AM
#60
It's the rods. there have been several cases of people replacing their rods in a 4b11t that appeared to been running perfectly fine, only to find out that the one of the rods was horribly warped. Like several people have been saying, the damage that caused the engine to break may have happened long ago.
This reportedly came out of an evo x that was running just fine:
edit: another similar example:
This reportedly came out of an evo x that was running just fine:
edit: another similar example:
Last edited by blk-majik; Feb 21, 2012 at 11:10 AM.