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Old 01-14-2011, 08:03 PM
Race1Mopar Race1Mopar is offline
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Default Question. New YSi, cutting out in dyno at 5000rpm

I have a question for you boost guys.
I have a 410ci with a YSi on a mild 6lbs of boost. While trying to tune it we can do a full hard run in 2nd all the way to 6000rpm with no problems but in 3rd she cuts out at 5000rpm like clock work, so we think it's load related.

She is build with a forged crank, h beam rods, custom pistons, 8.8:1 compression, hot cam, single plane intake, 58mm throttle body, custom dual exhaust that x-piped and has high flow cats and mufflers.

We went to a colder plug, gapped it at 20, added the new 135mj MSD. Actually it used to cut out in a couple placed till this and now only cuts out at 5000 now. Replaced cap, rotor and wires.

I'm not big yet, tuning at 6lbs first and only about 480 at the wheels so far, but of those of you running big power are you running a stock crank sensor? I'm wondering if the flex plate is flexing under a load and throwing things off. The reason i say that is on the logs when it cuts out you can see the RPM drop and then go back up. Were going to add a new crank sensor and if that doesn't work add and external one but was wondering if any of you have run into this and how you solved the problem.

It's also intercooled and the input air temp is really good.
Thanks,
Joe
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Last edited by Race1Mopar; 01-14-2011 at 08:20 PM.
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Old 01-14-2011, 10:51 PM
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Sounds like a awesome setup Joe . Have you posted any pics ? I would love to see it . Have you monitored your fuel pressure when this happens ? You could have a failing fuel pump .
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Old 01-17-2011, 11:34 AM
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It's doing good on fuel when it happens. I have one of KRC's full return systems in it with two pumps in the tank. Logs show I'm only 40% duty cycle on my 75lb injectors. I'm leaning to the crank sensor or flex plate because the two times we caught it on the logs the rpm drops for a split second then goes back to normal. There isn't any hint of detonation, just drops power for that split moment that the rpm drops. If you get through that spot it will pull the rest of the way to 6000 rpm just fine on the dyno.

Another friend of mine, Brandon, sent me this. I plan on looking into it also.
"I know that dodge has used the crank sensor on the flex plate and they've had TSBs about a slow start problem which may be related. check to make sure the flex plate isn't cracked. If it has even a slight hairline crack in it this will allow a big gap when a heavy load, against the pressure plate, is applied. If this happens when you put the load on it it's possible that it's loosing signal. You can put a scope on the sensor and watch to see the reaction when it starts cutting out. "

Plan on getting a scope on it to see if that's the problem.
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Old 01-17-2011, 11:38 AM
Race1Mopar Race1Mopar is offline
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Old 01-17-2011, 11:47 AM
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Originally Posted by Race1Mopar View Post
Plan on getting a scope on it to see if that's the problem.
That's what I'd recommend. Scoping the CKP waveform will tell the whole story on how it's working. I see you're using MSD ignition - is that just the box or are you running one of their coils as well? A stock coil could very well be breaking down.
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Old 01-17-2011, 11:59 AM
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I'm running a 45k coil as well, aftermarket. I did change the coil with the other electronics to ensure it wasn't the ignition system.
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Old 01-17-2011, 08:36 PM
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I don't have any input/advice/or expertise on helping you solve your flat spot but your set up is SIKK. I know you are still tuning but what kind of numbers is that thing putting down? I am curious to know. Any other main drive train components that you needed to beef up? Billet torque convertor. Vavlebody on the trans?
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Old 01-18-2011, 12:28 PM
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Thanks SUL7ENAZ
She's built front to back. Kevlar bands in the trans with built valvebody. Aftermarket Torque converter, Custom Drive Shaft with 1350 U-Joints. Just about everything can stand the power right up until I split the block if I wanted to but at the moment we are getting bugs worked out before flogging on it. If you get through the spot it will pull all the way to the limiter cutoff I set at 6000rpm. I've spun her to 6400 and she still pulls strong all the way up but I want some longevity too, hence the 6000 limit. We hit 480rwhp run on the dyno once but again we really haven't tuned her yet.

Just being patient...
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