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pre-dyno tuning / minimizing dyno time and ching-dow

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Old Aug 11, 2008 | 09:12 PM
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Originally Posted by y8s
reality is more that you need excess fuel for complete combustion of the oxygen available because of the non-ideal nature of a motor. fuel sticks to parts, doesn't vaporize well, etc. dump in more than you need and hope for the best. that need has declined as engines are better designed but it's still there.

i dont know about fat/tq and lean/hp but the difference there is probably more engine speed and airflow related. i wonder if that's more a result than a cause.
well, i thought anything fatter than stoichiometric meant unburnt fuel fuel / colloid mixture. However, you have to take into account that I'm a not a chemist, not a tuner, and genuinely dumb to all this ****.

The more research I do, the more I want to let a professional tune the car...but then I run into the same variables I was crying about earlier with ripping me off and shitty ideas on tuning.
Old Aug 11, 2008 | 09:17 PM
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Originally Posted by hustler
well, i thought anything fatter than stoichiometric meant unburnt fuel fuel / colloid mixture. However, you have to take into account that I'm a not a chemist, not a tuner, and genuinely dumb to all this ****.

The more research I do, the more I want to let a professional tune the car...but then I run into the same variables I was crying about earlier with ripping me off and shitty ideas on tuning.
i bet even with the diy timing map and an afternoon of logging you'll make 250whp easy. get it together have some fun and maybe look into tuning over the winter
Old Aug 11, 2008 | 09:30 PM
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Originally Posted by Mach929
i bet even with the diy timing map and an afternoon of logging you'll make 250whp easy. get it together have some fun and maybe look into tuning over the winter
well I have a track day on 9/20. I also have an 8.8:1 static compression motor, so i can roll the spark way forward...because I'm baller.

Its going to be a real bitch when I get it to the dyno and realize its making more torque and power than I wanted (transmission death), and have to roll it back. lol I think the bore, head, bigger turbo, 3" exhuast, and alignment of the planets spurred by me working on the car will make 250whp pretty ******* easy to hit.
Old Aug 11, 2008 | 10:19 PM
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Originally Posted by Mach929
i'm pretty sure you want them 1500-1600
as a maximum. sustained 1600 F temps could burn valves over a pretty short time. short term is ok. on a track I'd keep them below 1500 since you'll be in boost for longer periods at a time. (bear in mind that where you measure makes a difference--lets assume this is at the collector pre-turbo)
Old Aug 11, 2008 | 11:09 PM
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Originally Posted by hustler
well, the compressed gas pre-turbo is going to be hotter than the gas post turbo.
Would someone care to share where is the best location to place the EGT sensor?

Thanks
Old Aug 12, 2008 | 12:17 AM
  #66  
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Originally Posted by Rafa
Would someone care to share where is the best location to place the EGT sensor?

Thanks
I can't speak to the best place, but most people around here are going to put it somewhat close to to the turbo in the manifold / collector. Here's where mine is.. the probe is not in the port but the port's there on the right..

Old Aug 12, 2008 | 07:18 AM
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Thanks for that pic Matt
Old Aug 12, 2008 | 09:12 AM
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mine is going as far forward on the downpipe as possible. I've seen taps crack on manifolds in VW's and I'm not playing that game. If I have any problem with the manifold, I plan on sending it back to BEGi without any resistance.
Old Aug 12, 2008 | 10:22 AM
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Originally Posted by hustler
mine is going as far forward on the downpipe as possible. I've seen taps crack on manifolds in VW's and I'm not playing that game. If I have any problem with the manifold, I plan on sending it back to BEGi without any resistance.
For $5 BEGI would have added the EGT bung. They put mine on #4. I drilled and tapped my greddy manifold and never had a problem with cracking.
Old Aug 12, 2008 | 10:40 AM
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Originally Posted by hustler
mine is going as far forward on the downpipe as possible. I've seen taps crack on manifolds in VW's and I'm not playing that game. If I have any problem with the manifold, I plan on sending it back to BEGi without any resistance.
I hope you meant manifold and not downpipe. I can't see how temps post turbo would give you a reliable measure of the heat coming out of your exhaust valves.
Old Aug 12, 2008 | 12:35 PM
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I originally had mine tapped right into the pipe but later added a 1/8NPT bung. Part of the reason was the threads got jacked in the original hole and F'd up the collar.

That pic shows the bungus among us.
Old Aug 12, 2008 | 12:45 PM
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Originally Posted by jayc72
For $5 BEGI would have added the EGT bung. They put mine on #4. I drilled and tapped my greddy manifold and never had a problem with cracking.
I don't want to take the chance.
Old Aug 12, 2008 | 01:01 PM
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Originally Posted by jayc72
For $5 BEGI would have added the EGT bung. They put mine on #4. I drilled and tapped my greddy manifold and never had a problem with cracking.
Jay, do you have a pic of yours?

Thanks
Old Aug 12, 2008 | 01:23 PM
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Originally Posted by Rafa
Jay, do you have a pic of yours?

Thanks
You want a picture of my bung?

I no longer have the Greddy manifold, and the bung on the BEGI manifold is nearly impossible to see with out removing the manifold, which I don't plan on doing It is under the #4 runner. I would have rather seen it in the collector, but given how it is constructed that would be darn near impossible. I locates the probe JUST into the manifold (my Prosport probe is pretty short), which is a good thing I didn't like how far into the manifold my Autometer probe went.

My EGTS are low compared to my greddy setup. This could have to do with location, accuracy of the probe or the turbo itself and manifold design.

Jay
Old Aug 12, 2008 | 01:24 PM
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Originally Posted by hustler
I don't want to take the chance.
THIS is a shocker. Send the manifold to BEGI and have them do it.
Old Aug 12, 2008 | 01:26 PM
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Originally Posted by jayc72
THIS is a shocker. Send the manifold to BEGI and have them do it.
no, I'm talking about taking the chance of it cracking regardless of who does it.
Old Aug 12, 2008 | 05:19 PM
  #77  
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Originally Posted by jayc72
You want a picture of my bung?

Jay
Are Canadian bungs smaller?
Old Aug 12, 2008 | 06:32 PM
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Originally Posted by Rafa
Are Canadian bungs smaller?
i know my American probe is long and rigid. It slips in American just fine, and worked just fine in an Asian bung on Saturday night. I've also used it in an Italian application and it worked very well in both the front and rear bungs.
Old Aug 12, 2008 | 06:39 PM
  #79  
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Originally Posted by hustler
mine is going as far forward on the downpipe as possible.
You know that the temperature post-compressor is lower than the temperature pre-compressor, right?
Old Aug 12, 2008 | 07:15 PM
  #80  
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I'm curious too if an EGT sensor in the DP is worthwhile. I've got the stock narrowband just sitting there doing nothing. Whack a $50 egt sensor in there for more logging info. If the numbers post turbo don't mean much then it's $50 wasted. Dont' need to just throw away Kaish.



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