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Turbo Tahoe Worklog

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Old 03-06-2006, 08:04 PM
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Default Turbo Tahoe Worklog

I started this over at turbomustangs.com, so some of it is a copy/paste. I'll update it when I have something worth saying.

JUST starting, but I figured I would let yall see what I was doing. Also, from what i have seen, not many projects like this has been done before, so I figured I would give those few interested a place to look. This is an extreme budget set-up and will take some time, so yall bear with me.

*1998 Chevy Tahoe with 5.7L Vortec 5700
*Factory stock besides exhaust, rims/wheels and a stereo.

Just in the planning (mental masturbating as some say) stage right now. I was considering a T04E-60 but decided it would be too small as a single. This is what the foam is modeled after though. As you can see, even with a larger turbo, size will probably not be an issue. Especially once I move the battery to the rear.

6" X 7" X 8"


^ With Air box and ducting pulled up.


^Ideal position.



^With some gentle messaging :P(sp?) of the lines in the compartment, I think I will be able to come up with at least 4-5^3ft of working space.

Please excuse my rudamentary design criteria, I lack the petty cash($10,000) to pick up a copy of AutoDesk Inventor or something of the like for designing. I'll make some official designs when I return to school after spring break. The exhuast is already routed to the pas side, so I think I will do as I saw somweone esle do. Keep the drivers side manifold the way it is and just cut off the exhaust and fab up a pipe that will connect to the custom ps manifold. I will be doing some research into airflow charicteristics, as I do not want to choke the turbo with a shitty exhaust mani design.


*Img rights of the creator. Image was linked off of the turbo bible.


Just looking over it and wanted to say sorry for the poor image quality. Twas a cold, late night and I was all alone. Updates along with questions and plans will come soon. Any and all comments are very welcome.

Thanks for looking!
Randy
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Old 03-06-2006, 08:06 PM
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I'm building this to be a fun driver, I love sound, I love this vehicle, love the idea of a sleeper, and cream myself everytime I think of getting in it and hearing that motor scream, the turbine whistlin and being pushed back in my seat. Some wonder why even put money into an SUV/pick-up to make it fast, but hey, "to each, his own". I'm not going for crazy power, no more than 400 horsies on the ground (my dad calls me abnormal, saying 400HP is not crazy power ) and no specific ET. I will replace the pistons with something a little more boost friendly, and I am considering rods, but crank may stay. I have read of a few people doing very well with stock cast iron cranks, and making more power than I plan. No FMU, but I am unsure of management as of this moment. That's abotu all I can think of before I go to bed. I'll bring this back up once I have something important to say.

I remember something I wanted to say. The stock fan and shroud make placing a decent sized IC literally impossible, so I decided I would save up and go for either one mondo electric or two smaller ones so I could get that shroud off and an IC in there. I want my 11PSI to be as cool as possible.

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Old 03-06-2006, 08:07 PM
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Was doing some research today and found I can get forged pistons for stock bore/stroke 350's for $29.99 I think I will go with that at first, watch the boost/HP and then as I get moolah, continue swapping out the internals and upping the power.

Originally Posted by hybred
seen a few set up like that. with the pipes going behind the motor in between the oil pan and trans. be a nice diy with a holset hx35w with the internal wastegate. if you decide to step up the mods a little you can always upgrade the turbo too. should get you to 450 hp nicely for a dailly driver.
Looking into my options. I got a flow map from some website I got to through the knowledge base and it gives some pretty high numbers, so I am going to have to check that out and see if I can validate it. They are I think 10lbs/min higher than my cals were. Until then, I won't be mapping anymore compressors. I'll make sure and look into the hx35w though.
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Old 03-06-2006, 08:29 PM
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I'm pretty sure you could squeeze a pair of reasonably sized T04b snails in there. The T04b is much easier to find cheap, as the technology is considered obsolete in comparison with the T04e. I'm looking at some of the piping (pulled up a full bay pic of a Tahoe) and it could be interesting. Is it an AWD or RWD? A turbo Tahoe would be very cool, kind of like a more powerful Typhoon/Syclone. Perhaps a pair of 60-1s off of SVO Mustangs or turbo Thunderbirds would work better. I will have to find the issue, but HotRod Magazine had a snippet of a Canadian built Tahoe running a 408ci V8 on twin snails making an easy 1000+ HP. Certainly cost a bit, but could be replicated JY style for much cheaper. As far as exhaust manifolds, there was a TT Firebird at one point, wasn't there? Exhaust ports on the Vortec's may be different, but it may be worth checking out. Neat project though.

Henry
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Old 03-06-2006, 08:43 PM
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I have been thinking about twins, just not sure what would suit me best right now. I am going to do some more math (once I get the flow #'s confirmed) and look into it. My Tahoe is only 2WD, don't have to worry about the extra stuff down there I'm not sure about the Firebird, I'll have to check it out.
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Old 03-06-2006, 10:03 PM
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SSauto makes some turbo manifolds Probably junk like the rest though.Those Vortec 350's are great engines and I still prefer them over the 4.8 and 5.3 that replaced it.What kind of forged pistons are you going to get for under $30?Sounds a little to good to be true.
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Old 03-06-2006, 10:22 PM
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Originally Posted by 90dx
SSauto makes some turbo manifolds Probably junk like the rest though.Those Vortec 350's are great engines and I still prefer them over the 4.8 and 5.3 that replaced it.What kind of forged pistons are you going to get for under $30?Sounds a little to good to be true.
I would prefer to make my own actually. I am getting into fab, and would love designing/creating my own. I really like the motor as well. 255hp @ 4600 and 355tq @ 2800 is pretty decent. It used to move the Tahoe around pretty quick, as of lately it is getting sluggish though, so I'll have to fix that As for the pistons, I will have to look into them some more, they are great but in a link provided it states they are for 67-97. I think it is deck clearance that is different. I will have to do some research.

Originally Posted by http://www.SummitRacing.com
TRW-L2256F $29.95
Brand: TRW Automotive
Product Line: Speed-Pro Power Forged Pistons
Bore (in): 4.000
Piston Material: Forged aluminum
Piston Style: Flat
Compression Distance (in): 1.563
Dish Volume (cc): 6.10
Valve Reliefs: Four
Wrist Pin Style: Press fit
Pin Diameter (in): 0.9270
Top Ring Thickness: 5/64 in.
Second Ring Thickness: 5/64 in.
Oil Ring Thickness: 3/16 in.
Quantity: Sold individually.
Notes: Approximate compression ratios: 10.27:1 with 58cc, 9.60:1 with 64cc, 9.21:1 with 68cc, 8.85:1 with 72cc, and 8.52:1 with 76cc head.

Piston, Forged, Flat Top, 4.000 in. Bore, 5/64 in., 5/64 in., 3/16 in. Ring Grooves, Chevy, 350, Each


Thanks to a special aluminum alloy that doesn't expand as much as other alloys, these Power Forged pistons are designed to fit tight, providing the stability and ring control you need plus the strength you want. Speed-Pro even added ribbed skirts to them for better oil retention and even includes new wrist pins!
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Old 03-06-2006, 10:26 PM
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Well ---- nugget, I just did a quick search and turns out the heads are 64CC, so those pistons won't give me the CR I need anywhoo. I'll have to keep looking or switch heads if pistons are gonna cost too much. I'll look up how much volume I could make up with a thivcker gasket as well.
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Old 03-06-2006, 10:58 PM
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This thread is ------dom. Dont start a thread until you know what the ---- your doing :1




and what kind of horse ---- is that diagram... What retard drew that. He has the entry of the turbo used for where the downpipe is. And the exaust blowing out the entry then going into twins. hahahahahahahahaha
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Old 03-06-2006, 11:14 PM
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Originally Posted by rawr
This thread is ------dom. Dont start a thread until you know what the ---- your doing :1


and what kind of horse ---- is that diagram... What retard drew that. He has the entry of the turbo used for where the downpipe is. And the exaust blowing out the entry then going into twins. hahahahahahahahaha
Haha, I didn't notice that. And I feel confident that I know what to do at this stage in my project. Nothing else I can do though besides read the books I have right now and go through others projects...

Anyways, the diagram was not to show how I plan on running my turbo, it was to show the basic idea of how I am going to route the DS exhaust and create a single manifold for the turbine.

Similar idea to this


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