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post #1 of 10 Old 02-26-2003, 04:57 PM Thread Starter
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powerstroke question

I am faily new to turbos and have aquired a powerstroke turbo for my 90 mustang. here are the specs on the turbo i have:The intake a/r is 1.1 and exhaust is 84. The allied signal pn is 991966c91
my questions:
1) what is the stock internal wastegate set to psi wise?
2) on the exhaust turbine outlet there is a butterfly that is not connected to anything, what is that for?
thanks,
mike

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post #2 of 10 Old 02-26-2003, 06:31 PM
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Re: powerstroke question

Quote:
Originally posted by mr_minnis

2) on the exhaust turbine outlet there is a butterfly that is not connected to anything, what is that for?

If i'm not mistaken, thats the exhaust brake.

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post #3 of 10 Old 03-01-2003, 01:16 PM
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Quote:
2) on the exhaust turbine outlet there is a butterfly that is not connected to anything, what is that for?
It's a backpressure valve for cold starts. Ever driven a cold powerstroke? They're pigs until that valve opens.

Quote:
1) what is the stock internal wastegate set to psi wise?
For '99 to current 7.3L they're set at 16 lbs max.

For the new 6.0L they're regulated for 22 lbs max. They don't have an "actuator".

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post #4 of 10 Old 03-01-2003, 02:24 PM Thread Starter
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thanks for all the help guys. i think this turbo will be perfect for what i want if i can ever find the v clamps for it

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post #5 of 10 Old 03-01-2003, 05:09 PM
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You can get the V-band clamps from any Ford dealer...

The compressor discharge vband clamp # is, YF-2488.
The exhaust inlet clamp # is, YF-2562.
The downpipe clamp # is, XC3Z-5A231-AA

Now, as far as flanges to meet up with those, well, I'd try turbonetics. Sometimes exhaust shops can build them.

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post #6 of 10 Old 03-01-2003, 06:22 PM Thread Starter
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19COBRA93
Thank you VERY VERY VERY VERY MUCH !!!!
I went to the ford dealership and they were clueless about a v clamp was. Just make to sure we are talking about the same turbo the exhaust inlet outer diameter is about 3 inches and the compressor discharge is about 3.25 (the one in the pic). Does the downpipe clamp go between the downpipe and the exhust system>?

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post #7 of 10 Old 03-02-2003, 02:28 AM
 
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Question Dumb Question

I know nothing about Turbo's yet, but I know Diesels don't turn much RPM (Cummins like 3,000 or something). Wouldn't that exhaust turbine or housing (whichever it is) be set up for that lower rpm operation? Wouldn't a car running to 6,000 rpm redline spin it too fast or something? Explain how this works and how he can use it on a Mustang. - John

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post #8 of 10 Old 03-03-2003, 03:07 PM
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Quote:
I know nothing about Turbo's yet, but I know Diesels don't turn much RPM (Cummins like 3,000 or something). Wouldn't that exhaust turbine or housing (whichever it is) be set up for that lower rpm operation? Wouldn't a car running to 6,000 rpm redline spin it too fast or something? Explain how this works and how he can use it on a Mustang. - John
This is sort of hard to explain without getting too technical, but basically;

You've got to look at cubic inches along with RPMs when looking at different OEM turbos.

The diesel motors do turn lower RPMs, but they're also much larger cubic inch motors. So basically it comes down to exhaust volume. A 7.3L diesel motor at 3000 RPMs is putting out roughly the same exhaust volume as a gas 5.0L at 5500. I'm sure there's a technical way to calculate it, but that's pretty much now it works.

The turbo I started out with was a T04E "54" trim with a 1.00 a/r turbine housing. This turbo was used on Medium duty Ford trucks with a 7.8L diesel. It has worked very well on my car for over 40,000 miles with no problems. Although I did upgrade the compressor to a 62-1 about 20,000 miles ago to gain more power. The "54" was only good for about 400 hp at the crank. This 62-1 is sooooo much better. So far I haven't found the limit.

Also, mr minnis, You are correct on the clamps. They are for what you said.

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post #9 of 10 Old 03-03-2003, 07:29 PM
 
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Which powerstroke turbos are the best ones for the highest overall power production? I thought that I heard that there was one that could support around 600hp in a gas engine. Nick
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post #10 of 10 Old 03-05-2003, 02:40 PM Thread Starter
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I have heard that the 99 plus are the best to use. Supposedly they will support around 500 horse. I am not sure though I will look throuigh my turbo book to see if there is a way to calculate the cfm.
19COBRA93--Thanks again for all the help


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