I have noticed that people ask ALL the time (including me one time) what turbos they should use for a TT setup or a single turbo setup. so lets make a list and then have one of the mods make it a sticky if they would. so post what you think would be good for a TT setup or a single turbo setup for 5-20psi. and the A/R's that would work good.

just thought we could keep the board a little cleaner that way.

thanks

Josh

 

Stock motor:

twins could be turbo coupe turbos. I dont know the AR sizes but I think there are two different versions. The smaller being best obviously.

single, Id say a single 60 would be good. that is what comes wiht a lot of aftermarket kits for stock engines.

Modified motor: Cant say. Depends on motor mods.

Monty has those twin 51's making 1200hp. Or you could do a single 76 and make a decent amount of power either. But the sky is the limit after you start modifying ****.

 

Twins:
There are actually three different turbos for Turbocoupes. The later intercooled (87 up?) use a smaller IHI turbo. I'd stay away from that. The middle turbo is the usual .60/.48 T3. It'd be better on a 305 or smaller cube engine. The one most commonly seen on setups is the .60/.63. They seem to be good at making power (Stang guys don't seem to have a problem taking them into the deep tens) and spool pretty quick.
GN Turbos could be used. They're a little more expensive, but would probably support more power than the Turbocoupe models. They also use the 3 bolt flange, so remember that.
If need be the results from this could be pasted into the turbo sticky. Probably keep the board a little cleaner.

 

Two T3s off of a turbo coupe will make between 400 and 600 HP depending on heads and tune oviously. The IHI turbos off the '87-'88 TCs have very good spool times for those looking to make a turbo motor that redlines around 5500 RPM and makes 300-450 hp. The advantage of the smaller IHI is much better drivability from a broader torque curve. It also give the ability to run a smaller lift and duration cam which means you don't need to machine for 1.500" spring pockets or reduce the guide height. It also means the use of high strength springs and rockers are not necessary. The only T3 turbo that does not exit the compressor to the front of the vehicle came on SVO Mustangs. The IHI turbos exit toward the center of the vehicle and were intended for top mount ICs.

 

The T3’s used on the 2.3L fords both use the same compressor, a 60 trim. 2 of them move enough air to make up to about 700hp. The early manual tranny cars got one with a .63A/R exhaust turbine, the early auto cars got a .48A/R. The .48 will spool faster but will also become a restriction sooner, limiting the power production with a pair down to about 650hp. The IHI’s (RHB5) used later are much smaller, probably good for a little over 500hp as a pair. The GN turbo is also a 60/.63 T3, but it uses GM only flanges and a GN only compressor wheel which is a little larger and good for about 750hp when used as a pair. They will all spool well on a 350, the .48 and IHI’s will spool well on a 305 (really, the .63 will probably work well on a well built 305, but it won’t be fully spooled off the line).

Of course, what you actually see in your combination depends on your tuning and on that actual combination. None of the 3 turbos that came on the 2.3L ford were ever used from the factory to push over 210hp, and the funny thing is that the later cars with the smaller turbos were rated at much higher #’s then the early cars (in some cases, 145 vs 210hp), so of course, they’ll work for moving significantly less air then what is needed to make the HP listed in the first paragraph.

Most of the T3’s used on the ‘80’s Chrysler products are about comparable to the IHI’s and would top out in the 550 hp range. These will spool very fast like the IHI’s. I’ve seen a pair on a 350 that worked very well and ran high 10’s@120mph in an f-body. Most of the larger Saab and Volvo turbos are in this range or slightly smaller.

Most of the mitubishi and KKK turbos are quite small, the ones that are appropriately sized command too high a price. Be careful with he IHI RHB5’s, since there are variations significantly smaller then the version used on the ford 2.3’s, like the one used on the Probe which is probably not even enough to pump 200hp worth of air.

FWIW, the 60/.63 T3’s are just about the optimum size on a mild 350. Their compressor maps tend to match the engine’s air requirements very well up to over 20psi boost. The GN turbo will give you more airflow but you’ll need a significantly larger or better flowing engine below it to take advantage of it because you’ll exceed it’s maximum rated rpm above 17psi pushing more air then 700hp worth (again, assuming twin turbos, in other words, to use the extra air flow capacity of the GN turbo without significantly shortening it’s life you need to increase the airflow capacity of the engine below it so that the boost does not go over 17psi)

 

hmmmm.... this makes me wonder ( if some of us have size restrictions in the engine bay), how do we equate or come to a size of a single turbo that would equal the power potential of twins? And I'm pushing with both sides as a given. For instance, two .48's (t-3) would equate to....? I guess I'm, in around about way, wondering how my ht3b turbo will work when both sides of the 350 block are pushing out the juice. Any thoughts?

 

Heh, nice… I found a source for those, new rebuilds for $200…

The only reason that I didn’t grab one (or more) is that as best that I can tell, they’d be good for well over 1600hp on a gas engine and would be past the surge line at most points under 8-900hp. The smallest engine that I know of that they came on was the ‘small block’ Cummins which was something on the order of 14L…

 

When I first saw it the shear mass of it made me want it really.... it gets a lot of looks when we have ppl come through the garage.
like "holy ****, that thing could eat a large cat!". I"m going to see how it works kinda soon, and its certainly is different for a street rod. Plus I've got too much invested in the Burns Stainless down pipe/transistors to swap for something else right now without seeing it perform. I've learned so much about turbocharging since buying it. I've enjoyed every minute

 

Well, tell us how it works when you're done... I'm curious... like I said, I passed up on the cheap rebuilds just because I figured that they were too big.