Considering doing a single turbo, what size turbo would I need to say run something like 4 or 5PSI of boost while the engine is as is, and then possibly in the neighborhood of 10-14PSI once the engine is rebuilt and I have some experiance tuning and what not.

If this is something that I think can be done fairly easily I might start working on mocking up some exhause routing etc see what everyone thinks and what not.

TIA for any help
NO91

 

Go for it! You should be able to run about 6psi with no problems non-intercooled.

 

4 or 5 psi at the mile high you wont even feel nothing...you need to run about 10 on the stock motor intercooled then it is go time! but i would get a huge turbo i would think would be better then 2 little one's but i could be wrong?

 

I was kinda wondering about that.

I spent the better part of last night reading about turbos, and looking a compressor maps and what not, and I think I am actually more confused than when I started. I was thinking that a T04 turbo should be enough to provide a low level of boost, they are supposed to be able to support up to like 550hp, and there is no way my engine would make anywhere near that on 5 or 6PSI, the only thing that I am not sure about would be wheter or not the exhaust flow from a V8 would over spool the turbo.

As for fuel managment, I plan on picking up a 1227749 ECM (typhoon/cyclone) and repinning the wires that are in the car, and since my car is already a MAP car, all I would need to do aside from the repinning would be hook up a 2 bar MAP sensor.

I have been playing with the CATS tuner, and think that I could use that combined with a data logger, and the wideband dyno we have here to get the car dialed in pretty well. I already have a good laptop, and would buy the burner and cables, as well as a romulator since it seems that works pretty well, and it would be nice to be able to make changes and see how the car is responding without having to burn and erase and reburn chips.

As far as routing the exhaust, I think I have found a pretty easy way of getting it over to the drivers side. I am still trying to figure out what kind of material I will be using, because as it sits in my head I will be using the factory manifolds.

 

Hey no ordinary 91,
I plan on making a Turbo setup soon as well. I was told by jburnett ( Makes custom Turbocharged cars all the time) that you need pretty thick walls on the tubes if you use mild steel, unless you plan on using stainless steel.

But anyway, which way did you think of to route the exhaust pipe back to the drivers side? I'm planing on going with a Twin Turbo setup, but you could change my mind on this and would be cheaper ( One less Turbo). Plus what about using a sycloon or typhoon turbo, I found a site www.turbochargers.com They sell them for about 700 and they come with the wastegates. Also they support about 370ish HP, which with two is way more then enough for me. :yesnod:

 

Basically what I plan on doing it taking the exhaust off the passanger side and routing it under the oil pan, basically how they route the exhaust on the camaros, I figure with heat wrap, and heat shielding on the pan, and with the oil cooler, temps should see little to no increase.
I either plan on using the factory manifolds, or a set of shorties, I am not sure how easily available either stainless or the thick walled mild steel is around here, but I don't plan on doing this many times.

 

:lurk:

 

I've actually got a Buick GNX replica at the shop right now that has (get this) a built 305 TPI motor (replete with forged internals!) with a single 60-1 turbo on it. It uses a set of TPI Corvette manifolds (which are a low series, thin-wall stainless tubular header) that have been modified to work with a standard 3-bolt Turbo Buick style turbocharger... the exhaust is run EXACTLY as it would be on a standard Turbo Buick which is very similar to what you're trying to do; it uses a cross-over tube from the driver's side manifold over to the passenger side (reverse of what you're talking about) and the turbo is mounted where one normally would be on a T-Type... Very simple and pretty damn stout but he wants to spend some MAJOR money so they're going through the engine and building him some better headers, bolt on a BIG single turbo and swap over to Electromotive electronics...He's wanting to sell the turbo headers, cross-over, and flange assembly (sorry, turbo isn't available, it's going on my Grand National :D ). If you're interested I'll find out what he wants for it. It's kind of an ugly setup but it works...The only thing I would do if it were mine would be to TIG all the joints to strengthen and prevent the manifolds from cracking (which the wire-welded ones are prone to do).
-Jeb


[Modified by jburnett, 2:55 PM 7/26/2003]

 

I was thinking about doing something like that, but the heat, the low ground clearance, I dunno. Another thing the outlet pipe on the Turbo must be huge if it is a singal turbo, just doesnt look like theirs enough room for it to fit. Anyway check this out http://www.twinturbovette.net/Home1.htm His setup is pretty good, BUt I think he told me that his engine uses Block Hugger Headers, and I'm told that this isnt that good b/c the walls on the Headers are thin and would not stand the extreme heat and pressures. But his is still running. Maybe he did something different? :confused: LIke build his own thick walled Block Hugger headers.

 

If it works, then I would definately be interested.
I am not looking for anything to handle massive horse power right now, so something like this would do, once I get everything down and the engine rebuilt then it will be time for the stainless of thick wall exhaust, and huge turbo, possibly turbos :D
Jeb if you can snap some pics of the set up I would greatly appreciate it, and it he is interested in letting it go let me know.

-Isaac

 

I'm going on vacation for a week today but when I get back I'll take some pics and email them to you...The setup works pretty well; he's probably running close to 400 rwhp with the single 60-1 turbo on a good tune. The only thing I'd do is just like I said above, maybe hit the weld joints with the TIG welder and strengthen them a little bit to prevent cracking. I would also replace the 3-bolt turbo flange with a 4-bolt flange...3-bolt turbos are weird and are unique to T-Types... 4-bolts are much more common. Either mod wouldn't be difficult to do. I'll IM you when I get back into town.
-Jeb

 

Any news on the manifolds yet?

 

I would think twins would be an easier set up.

 

:iagree:

 

Just got back into town today...Will check with the owner and take some pics tomorrow and will let you know.
-Jeb