Turbo Testing Validity - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 28 (permalink) Old 09-03-2007, 04:09 PM Thread Starter
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Turbo Testing Validity

I have been wanting to know how it is said one turbo is better than another, or more specifically it spools better. I believe it is almost impossible to gage this with only the ability to compare based on memory.

I believe Charles made a intelligent statement when he gave references to dyno testing and seat of the pants comparison. It may have felt like it had more power, however the dyno did not reflect that feeling.

A turbo spools so fast I do not know how you can comprehend which one is faster while reading a mechanical gage and no ability to time stamp the results. There is to much room here for inconsistency. I have tested with the ability to time stamp, however it is still not what could be labelled as good scientific data. In a technical field you could never sell devices based on this type of testing.

What about taking a vehicle with a GT38R and put it on a dyno and apply X amount of load in overdrive, initiate Y amount of throttle angle and see what boost it makes. Next would be to swap the turbo and install a Turbonetics and try the same, would this not be a more accurate way comparing.

The turbo that made more boost under seemingly identical testing would be able to claim it spools more easily. The very same testing could be made to apply to turbo surging as well. I am not a Gale Banks fan by any means, however no one can refute the ability he has to accurately test products backed with the ability to provide legitimate data.

Testing products accurately with legitimate documentation should mean something to us as consumers. For me personally I would like to see a little more hard documented testing in lei of opinions so I can make an educated choice.
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post #2 of 28 (permalink) Old 09-03-2007, 04:59 PM
 
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Re: Turbo Testing Validity

I think a good back to back dyno run should tell the story.

The powerband should show you where the turbo starts to make power, and what the gains are through the power band.

A good weekend testing on the dyno, at the drag strip, and hauling trailers would be great comparing turbos.

Companies like hypertech do it for they're electronic devices, we should be able to get this kind of info for specialized parts such as turbos.
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post #3 of 28 (permalink) Old 09-03-2007, 05:51 PM
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Re: Turbo Testing Validity

I agree with the dyno pull as a testing tool. The main reason for this is the fact that spool time is about the lowest attribute to be placed on the list of those describing a turbocharger's worth.

You could take the stock turbo from a subaru and put it on your truck and in a spoolup comparison you would be crowned winner.

Another consideration is that engine power output does not follow boost as an absolute value. My truck makes more power at any boost value now with the compounds. Even before it starts really making any boost (less than 20) it will be pulling very hard and stands a very good chance of blowing the tires off.

One turbos 30lbs might not make any more power than anothers 25 or 20lbs. Compressor efficiency and the subsequent effect on intake air temperature and the relative density of that intake air are nowhere to be found on a boost gauge.

They will show up with wonderful clarity on a dyno however.
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post #4 of 28 (permalink) Old 09-03-2007, 06:29 PM
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Re: Turbo Testing Validity

scheid diesel compared the two back to back over a year ago i believe. i forget the details of the comparison etc, i'll see if i can dig something up. if i remember right the TN was down 12hp on the BB.

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post #5 of 28 (permalink) Old 09-03-2007, 06:50 PM
 
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Re: Turbo Testing Validity

What about the shape of the graphs as well, not just differences in peak HP
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post #6 of 28 (permalink) Old 09-03-2007, 09:37 PM
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Re: Turbo Testing Validity

Quote:
Originally Posted by JMS1 View Post
I am not a Gale Banks fan by any means, however no one can refute the ability he has to accurately test products backed with the ability to provide legitimate data.

"Ability" being the key word.

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post #7 of 28 (permalink) Old 09-03-2007, 10:19 PM
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Re: Turbo Testing Validity

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Originally Posted by gregrob View Post
What about the shape of the graphs as well, not just differences in peak HP
Fancy word...Calculus = area under the curve. Which is why a dyno would be ideal for comparisons.

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blip the throttle, and you just changed your "HPOP" oil
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put that on youtube
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post #8 of 28 (permalink) Old 09-03-2007, 10:21 PM
 
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Re: Turbo Testing Validity

Yep
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post #9 of 28 (permalink) Old 09-03-2007, 10:25 PM
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Re: Turbo Testing Validity

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Originally Posted by gregrob View Post
What about the shape of the graphs as well, not just differences in peak HP
i believe peak hp on one of them came a bit lower but they were close. i really am not sure. it was Les @ the Lafayette store that told me that if i remember right. this was june-july 2006 when i was looking at turbos.

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post #10 of 28 (permalink) Old 09-04-2007, 12:52 AM Thread Starter
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Re: Turbo Testing Validity

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Originally Posted by imelmo View Post
"Ability" being the key word.
Danny,

I believe we have the ability to properly test these turbos, maybe the parties of interest will consider stepping up and throw a turbo in the ring. The dyno ring that is, not just on someones truck to give us a seat of the pants commentary. Dyno testing would take all the opinions, manufacture and vendor loyalty and throw it out the window. Hard figures to compare.
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