Ok I know this isn't an F-body, but I can't find anything that is really giving me the info that I need. So here goes...

My brother has a 94 S-10 with a stout 355 in it right now, but he wants more. This is not being built for drag racing, but for a street/pro touring truck with a triangulated 4 link and coil overs out back with 315/35/17 tires and coil overs up front with a 275/40/17, and a cage. We are in the process of finding a 400 block and he has a forged 350 crank and we are going to put together a 377 single turbo motor for now and it might be a twin turbo after he gets board of the single. The motor he has right now is 10.75 to 1 compression so boosting this motor is out, but it will be used for mock up. Or could we boost his current motor with a small amount, something like 4-6 psi?

I'm trying to do all of the research for him on turbos, but I'm not completely sure on what turbo, wastegate, blow-off valve, or anything else to get. The new motor will be built for boost and probably 8-8.5 to 1 compression so he can really turn the turbo up, probably 15-20 psi??? And he also has a set of ported stock cast iron heads the were professionally ported for a supercharger that we will use on the 377 when we put it together.

But what I need is some info on a good turbo to get, what #s should I look for, what inlet type, what outlet type, how big, what to do to hook it to a carb, and so on. I was looking on ebay for a cheap one to use as a mock up and then he could buy a good one later on, but any helpful info would be greatly appreciated

 

i would do a 350... forged... 9/1 compression (if not a bit more even)... how much power you want?

I would say a front mount with a T67 for a good 600 hp and fast spool. Better the heads flow the less boost it will take to make more power...

big cube 427 with twins would be badass... but this is a s10... i think twin turbo will be adding a lot of weight up there... lol

 

Yea stay away from the 400 blocks with boost. You'd be better off building a 350 block.

You never stated your hp goals, which are quite important when choosing a turbo.

As far as the carb goes, get a carb and hat from CSUcarbs.com. They work extremely well out the box and they can sell you a proper fuel pump and regulator too. Be prepared to spend $1500 on these components.

 

We are trying to get into the 600-650 rwhp with this truck. Why not do a 400 block with a 350 crank to make a 377? I figured that a 377 (a motor that like revs) would be better suited for a turbo build. Either way we have 3 350 4 bolt main blocks and 2 2 bolt main blocks laying around and plenty of parts to put one together minus pistons and rods.

We are just begining to put the truck back together now and it probably won't see any boost for some time but we have the parts to start a motor build and he has always wanted a turbo so it will get one next year or the year after. Like I said this isn't going to be used for drag racing, but more of a pro-touring type setup that we can have some fun with and hopefully not wreck LOL

 

Funny thing is . . . turbo motors don't like to rev. There's a guy on tm.com that's making 1200 rwhp in a turbo mustang with a true 302, and it peaks at 5500 rpm. No need to rev a turbo motor. You can build one that revs, but you'll need a T6 framed turbo, which is huge, laggy, but will make 1500 hp. Way beyond your needs. And besides all that, 400 blocks are weak.

To get 600-650 rwhp, you could build a mild buildup. 355 or 383 cid, 224/230 cam, Vortec heads, single plane intake, CSU 750 carb, etc. For turbo's, you could scrounge up a couple of stock Buick GN turbo's, or a single Turbonetics T76MPS to get you there.

 

Thanks for the info, I always thought turbo motors were better off reving but I guess that I was wrong.

Well the parts that he has are a set of cast iron ported heads (I don't have any flow #s but they were professionally done for one of his friends blower motors) and a ported to match songle plane victor jr intake, forged crank, and blower cam, but I don't remember the specs. Hes planning on getting a set of blower pistons and some rods and then put it together and see how it does.

Right now the truck is coming back apart for a cage and powdercoat the frame and build the 4 link and put tubular arms up front and coil overs all around and making room for some big tires out back. Then well put the motor back in and drive it for a little bit then build the turbo setup during the winter and drop in the new motor.

So you are saying that a t76 turbo would be plenty to hit 650rwhp? I told him about the CSU carbs and hats and hes planning to buy from them. What blow off valve and wastegate should he look into buying and what else does he need? The truck already has a MSD 6al box, MSD pro billet distributor, holley blue pump, and hes planning another pump and a timing retard box for when the boost comes on.

Thanks alot for the help

 

A small-framed T76 has been as high as 990 rwhp. Large framed versions can go higher, probably as high as 1100 rwhp.

As for the WG, the JGS units are top notch. I would use a JGS 50 for the combo you describe.

Mike