Does anyone know what the volumteric efficiency of this motor is or know how I can figure it out for myself? I'm considering doing a turbo setup but I need to fill in some blanks first, mainly what size turbo is best suited for this motor. I know how to do the calculations in order to compare different compressor maps and how they would perform on this motor, but I can't seem to find the numbers I need anywhere. Can anyone help me out? Also, I'm fairly new to carb setups so I have a question reguarding that as well. I know how to calculate CFM consumption on a boosted motor of a certain size at a certain boost level, so do I just need to simply pick a carb that matches the CFM consumption of the slant 6 at "x" PSI, or is there more to it than that? I'd like to pick a slightly larger carb than what I think I will need just so I can have some head room down the road, but I've read that oversizing the carb too much can be a bad thing. Any advice?

Do a lot of reading before attempting a turbo setup. A lot of people think it's cool and a great source of power but I only know a few guys that have a full running setup. I talked to Slantzilla and we agreeded that they are cool, but few and far between compared to the NOS setups. For the VE values you can look at my VE table for the megasquirt and pick off some numbers, it's under the fuel injection page "How to TBI". Talk to Sam about his I don't know how he's been doing lately. Matt Cramer is also a good resource, the best one I know is Shaker.
Becareful of "big" carbs, you get a situation called dip-in where it lugs when you stomp on the throttle, mine is extremely bad at that. Also, it can destroy your piston rings running too rich. A great book to get is Street Turbocharging by Mark Warner. Other resources are turbomustang.com (don't know if that is perfect url) and moparmarket. Good luck, if you have anymore questions shoot me a pm, I've been doing some research and am only held up by monetary restrictions.

Well, I'm not so much new to the turbo environment, just carbs and this particular engine. I've built turbo motors before (all fuel injected 4 cyl so far), so I know a few of the pitfalls. I'm not really shooting for insane power numbers either, maybe 300WHP range on pump gas. Was mainly just looking for the numbers I needed so I could crunch them and figure out what would be a good turbo for this engine at that power level, since it's a bit bigger displacement at a significantly lower redline than what I'm used to. I found a good ballpark VE % on another thread here that got me started, and using those numbers I started plotting some different compressor maps and I think the T04E 50 Trim will give me pretty much everything I'm looking for out of this motor. It will easily support over 300WHP and on this engine should hit 20psi (track boost only, 15psi street/daily driven) @ about 2700RPM, according to the calculations I have done so far. I still don't know what size turbine housing I want to run, though. If it was a smaller higher revving 4 banger like I'm used to I would say T3 all the way, but the displacement of the slant 6 has me wondering if a T4 housing wouldn't be better for more top end flow. As far as the carb goes, my math tells me that this motor at 20PSI should be moving about 537 CFM, so I'm gussing a 600CFM Holley 4BBL should do the trick? I think that's what Shaker is running on his setup, correct? This is kind of uncharted territory for me so all I really have to go on is what other people have already done, and his setup looks pretty good to me (I would be more than happy with a 12-sec car). Mine will be pretty similiar to his with the exception of a slightly more powerful turbo. Anyways, research seems to be never ending so I'm going to get back to it and go do some more. Thanks!

I would go with the T/4 setup all the way, T/3 is really just to small. Although a 50 trim could work, it would be better to step up to bigger size.
The T61 T/4 would be agreat turbo for what you are wanting. You can get one with a twin scroll exhaust housing and a GT35 compressure wheel that would have very quick spooling and great top end to boot. Plus the air would be a lot cooler than using a 50 trim so you could get by without a intercooler if you had to. This would allow you to make much more power with lower boost numbers on pump fuel than a 50 trim. Plus if the time comes for pumping it up and race fuel the turbo could go there as well. The /6 will spool a turbo much easier than what you are use to with the 4cyl engines.

On a carb I would try to keep it small, you will be able to tune it better. Even something as small as a 500 Holley two barrel could flow what you are wanting under boost. On a four barrel I would try to keep it 550 or smaller. And if a four barrel is used dont use vacuum secondary carbs, get machanical. The Holley's are very good for blo-thru setups. Also the hat you use on the carb has a hugh effect on fuel metering and air flow. Dont skimp and get a good one.


Jess

I have to agree the T61 was my turbo of choice. The GT35R would be even better, but a little outside of my budget. Also, a 300whp slant six is very impressive, it's not just a simple accomplishment. Such numbers are my goal for the next build and I'm pulling every trick I know. For a comparision the 360 crate motors through Mopar Performance are just accomplishing this.
The 20psi is defintely going to need an intercooler and possibly water injection, correct? On this note the Megasquirt is a very cool program and cheap setup to run both the fuel and water injection. If you familar with turbo 4 cylinders, you most likely know how to mess with the ECU this is exactly the same except you got to start with the VE and timing. Just an idea, good luck keep us updated.

Hey Valiant1,

Shoot me a PM if you need some additional specs. I have a thread/pics on turbomustangs.com and alcohol-injection.com as well.

The best advice I have is have a good fuel system, get a wide band O2, and start rich.

I don't think a T3 is too small. Shaker233 is running a T3 off a GN and is making over 300 hp.

I plan to run a T3/T4 hybrid and came up with the same compressor as you did Valiant1 (50 Trim). I am leaning in the direction of a .63 A/R turbine with a stage 2 wheel, based on comparison with the GN setups.

I don't think 300 hp (or more) is all that difficult with about 12-15 psi of boost. If a 2.2 can make an easy 200 hp with a similar flowing head and a small cam, then a slant with half again as many cylinders and a longer stroke (225) should make 300 fairly easy.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car