Sizing a turbo

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I've narrowed down my choices as of now. I think I'll start by trying to find a name brand unit like Garrett or Turbonectics. For me this will happen in the spring so I've got some time to shop around.

I talked with Cattledog last night and we'll be looking into having the manifolds machined for the EGR passage. If this project is something you would like to join in on let us know.

As far as that turbo specifically I don't know but the .81 ar turbine seems about right.
 
Tank. Thanks to some unexpected funds from some military duty I am assembling all the parts. The turbo and the manifold are the two big items. I emailed the seller of the manifold directly and am waiting to hear.
 
tiorio said:
I think that's the point, at what cost does the supercharger produce this airflow? You have a tradeoff between losses and gains, the perfect match between engine demand and compressor output means nothing if it requires a significant amount of power to get there.
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What's significant power? My point is exactly that if CE is low enough on the turbo (specifically, you can't find a good match), the 25hp required to drive the SC becomes effectively less differential. Combined with instant boost and throttle response, certainly a closer match than I've seen in any off the shelf turbo map.

With a single turbo, you are either going too go big to meet the displacement = lag, or too small to gain the low end response = lose high end exhaust flow.

At 1.5PR the TRD SC is on the air demand of the engine. The real question is, does the inefficiency of a large single turbo designed for double the PR the 80 is running, make more, better or higher power?

IME, that's the question. Anyone can do the math on the SC. It's a lot tougher to do the math on the turbo application. I say a turbo that's running at half or less of it's designed PR is at a distinct disadvantage.

This would be a lot simpler if we had a good comparison between the two types of forced induction. Right now, we have an intercooled turbo setup, with timing/fuel mods and exhaust compared to a non intercooled SC setup, with bad fuel mods and stock exhaust.

I'm working on evening that up a bit. Paying customers come first in my shop. Unfortunately, all turbo quattros...

ST
 
What would be the ideal choice between these three choices from West Coast Turbos? What does the E, B, and S mean? I hear a lot about going with a T04E and a T04B but, haven't heard much about the S... Either of the three are within my price range if they are a quality company.

http://www.westcoast-turbo.com/turbob.html
 
I did some Googling and believe that OBX is made in Tiawan and does not get good reviews. The West Coast Turbo sound like a better option. At least it is made/remanufactured here in the US.
 
Just a FYI for the DIY people. Turbo Engineering used to be in Denver but has since moved to CA. A friend of ours owns it now. Might want to see what they can do for you. http://www.turboengineering.com/

They have all the state of the art equipment to fix, rebuilt and service turbo's. Tell them the guys from Slee sent you. They have also in the past rebuilt Safari units when the housing cracked. In these cases the turbo's was replaced.
 
Purchasing a turbo

Some heads up from a turbo guy:
Forget ebay, unless you already know exactly what you want or need. Call a turbo builder, there are several in the US. They are going to want some airflow numbers and displacement numbers and PR targets from your truck. Get Corky Bell's book and get those numbers.

I say you buy a 500dollar turbo, you may or may not get want you are looking for. And you will probably spend 3 times that to get it working right for your application. Up the budget on the hardware. I'd bet most guys will come in at a grand or so, and be much better fitted to the application.

I'm all up for cheap**ss racing. IMO/E that only requires that you educate yourself better so that you don't waste a lot of money getting it right. If you aren't willing to educate yourself better, then find someone that can do it for you. Ebay won't.

.02 from a well seasoned turbo and budget director.

ST
 
Well, I've probably figured out what I'll buy for a Turbo and it will most likely come from EBay. Is it the best choice, who the hell cares. I'm not trying to win any races or some prize for the best design, just having some fun modding my truck.

While me and Cattledog will be doing this together we have both chosen different turbos at this point. It will be fun to work them out and compare the results when done.

For me it's the journey as much as the results that I enjoy. If I wanted a slam dunk I would fork out the cash for a kit. I didn't do that with my suspension and won't do it with this as well.
 
MSGGrunt, I considered the first one as well. If fact I still am. For another cheap alternative would be this one, from the same guy (TURBOS). It would require an adapter that can be gotten from EBay as well for 45.00. The advantage is the ballbearing center. There is one of these being resold right now that was purchased from TURBOS but not used.

But I'm still on the fence.


As far as the OX brand, the fact that they already added some bling factor scares me as that might indicate a marketing strategy toward a cheap flashy product, not what I'm looking for in a turbo.
 
I agree with your concerns with the OBX. The other turbo would require and adapter for the T3 turbine side? I've heard/read to go with a straight T4 flange. Which makes is harder to find the right turbo as most everything out there is a T4/T3 hybrid.
 
I'm bidding on the first one in my last post. I hope the size is correct for the 4.5 looking for more power in the 2000 RPM plus range for towing on the highway. Now I need that manifold.
 
MSGGrunt said:
I'm bidding on the first one in my last post. I hope the size is correct for the 4.5 looking for more power in the 2000 RPM plus range for towing on the highway. Now I need that manifold.
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Right now it's a best guess situation and that one would be as good as any that I can see. If you get it I'd like to take a look at it if you don't mind.

Best of luck with the bidding and let us know.
 
One thing I recommend you guys doing is to take note of the rpm band where you drive daily. Take the OBDII logger and log some data and play back the rpm signal. How often do you drive at 1800/2200 rpm and is this the time you need the power.

I know the expert on the forum thinks the AVO turbo is to big, but I can assure you it makes power where you need it. 1/2 throttle going up hill etc etc.

We did the final testing yesterday, and I would like to see another 80, even with supercharger keep up with us going up I70. Truck has 37" BFG AT's, 5.29 gears, all the common armour and it will top I70 at 90mph at the top of Look-Out mountain. Those in Denver know what I am talking about.
 
sleeoffroad said:
I know the expert on the forum thinks the AVO turbo is to big, but I can assure you it makes power where you need it. 1/2 throttle going up hill etc etc.
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Haha, I cannot figure out if he thinks that the APS/Safari System is too big or too small either, of course he says that there "is no turbo that is the right size for the 1FZFE they are all too big or too small" but of course he also has not done his dutiful homework enough to know that the APS/Safari has custom castings and that the internals do not match much that Garrett has got!

But Christo, as respectfully as I can say this, you are wrong on one thing; for the future please don't call him "the expert" ... he is anything but!!!

:D :flipoff2: :D
 
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