Stock engine - star pattern on pistons

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Jan 27, 2011 | 10:02 AM

#61

JonathanN

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Joined: Dec 2009

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From: Garden City, KS

I'd love to tune my own truck, but I haven't even had the chance to feel good tunes. I can now identify when my truck does tuning-related things so my familiarity is there, it'd just be more of the fact that I can't throw it on a dyno whenever I dang-well pleased to see what a tweak did. But I need to get a DP-Tuner first... I don't even have the money for that!

Jan 27, 2011 | 11:18 AM

#62

SkySkiJason

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Joined: Jul 2008

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From: N.GA Mountains

Quote:

Originally Posted by Pocket

Are the AC codes using stock nozzles?

If you are noticing that much of a difference, and the only thing that changed was going from 175cc singles to 160cc singles, then there might be something else going on. You sure you don't have an exhaust leak?

Stock nozzles. I did go to a 38R turbo... New, bellowed up-pipes and I didn't see any evidence of exhaust leaks when I just had the engine out. I also pulled the injectors (about 10k miles on them) for inspection - all looked good!

Dang, now I'm worried a little. The truck seems to run FINE, just noisier than before and a little low on power. EGT's, ICP (3000psi!), fuel pressure all good - per gauges.

What else can I look at with AE to find an issue?

Jan 27, 2011 | 02:45 PM

#63

Pocket

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Joined: Jun 2004

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From: Parker, CO

Quote:

Originally Posted by SkySkiJason

Well the injectors shouldn't be any noisier. And you shouldn't feel much of a difference in power either. But sometimes some injectors are built different than others. So who knows. If EGT's are in check, and everything else looks good, then I wouldn't be too worried about it. Sometimes the SOTP meter can be deceiving.