hey guys. I've built myself a turbo setup for my '73 falcon coupe (Australian Ford) with a 383ci sbf, and I'm looking to change things around a bit.
I currently have a basic 76mm S400, 1.32 T6 turbo. Engine specs are SVO 9.2 block, Scat forged crank and rods, Diamond 22cc-dish forged pistons, CHI aluminum 225 heads, 8.6:1 comp, solid roller cam (Adv dur 288 int, 288 exh, dur @50 254int 258exh, .714/.714 lift, 114 Lsa), 80lb injectors, Megasquirt.
I have a Reid-cased Coan powerglide with a 3500 Coan stall, and 3.5:1 9". 28" tyres.

I'm still at the tuning stage as the engine is new, but I'm already looking at upgrading the turbo. I'm looking at the 80mm S400SX with T6 1.10 rear, and possibly a race-cover.
I know the 1.10 exh will bring the boost in sooner, which would be good on the street (where the car will spend 90% of it's time), but would it be too much of a restriction up top and on the track? Is the 80mm compressor ideal or should i stick with the 76? and, is the 80mm/1.10 a good combination a good one for my engine etc?

as for the pipes, this is my current set-up:

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As you can see, the dump pipe drops from 5" to 3.5" right after the turbo, then it runs in to a tight 90deg bend, with another 1.5' after it. It eventually feeds into a twin 3" system. I'm guessing this is a huge restriction. Am i right in assuming this?

I want to turn the turbo around to face north-south, and have the dump pipe run alongside/above the valve cover, allowing me to remove the 90deg bends, and run a 4" dump. But this will wait until I change the turbo. I'll also lose the Ebay 'gate, and run a turbosmart or similar from the merge.

At the moment my main query is the new turbo, but any opinions etc on the piping is welcome too please

thanks, Phil.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

The 1.10 you are talking about is with the 83mm turbine wheel, right? If so there's no way I would go with that wheel on a healthy 383. The turbo you have now can be upgraded so an 80mm. Oh yeah, that's a monster cam!

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

I was looking at this page, http://www.forcedinductions.com/productsborgwarner.htm and this turbo: S400SX-80 ETT** 1050HP 1.10 92mm T6 and T4 $1199

There's also an 87mm turbine unit just below. I guess the 92 would be better suited to my CI.

Yeah it's a healthy cam, Dave Storlien from Porting Dynamics spec'd it for me.

I also forgot to mention the car weighs around 3700lb's.. it's a bit of a heavy pig haha..

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

the other option i have is to just buy a 1.10 turbine housing to fit on my current S400. I'm unsure of what size my current turbine wheel is, but there is a 1.10 housing that fits right on. The cost of one does however go a long way towards a whole new turbo..

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

If you're talking about the 83mm turbine, then no, that's way too small for a 383, especially with a cam with 28° of overlap. You need a HUGE turbine with that setup. If you're dead set on a different hot side, go with an s480 with a 92mm 1.1a/r turbine and get a custom cam. Your post turbine exhaust is really hurting spool, too. 3.5" is too small. I'm guessing that's not a custom cam for your setup as it's awful. Personally, I'd get a custom cam and fix the exhaust before swapping turbos.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

I walked off in the middle of my response and missed several replies lol. With a 383, a 96mm turbine definitely isn't too big. If they'rreally finally making a 1.1 housing for the 96mm wheel, that's the way to go. I've gotta be honest with you, that cam sucks. That cam is killing top end.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Unfortunately I know absolutely nothing about cams. It's all voodoo to me.. I sent Dave @ Porting Dynamics all the details on the engine and car, and he sent me the above cam.

It's disappointing to hear it's 'not ideal'..

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Jace (86xlnotch) on here is running the 92mm 1.10 and is hitting big backpressure with a stock 6.0L LS truck engine. I personally wouldn't want anything over 350ci on anything smaller than a 96mm wheel. That cam has 60° of overlap seat-to-seat, so you are going to need a huge turbine just to avoid backpressure. With a lot of overlap you end up forcing fresh air past the valve, adding more volume and more backpressure.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Bingo.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

thanks for that explanation/advice, much appreciated. With the improved dump pipe i'm planning (as much 5" as i can fit before the 4" going down to the twin 3", with minimal bends) would this turbo work well? S400SX-80 ETT 1.32a/r 96mm T6. Could i still use my current cam with that turbo and improved exhaust flow, or should i start again with a new cam?

hypothetically, if the above is ok, any ideas on when i'd start seeing positive pressure?

thanks again guys

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

That turbo would be great. The cam still has too much overlap though. Something like a 236/240 115lsa would be much better. You're current turbo is easily capable of 800 to the tire.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

I mean, that cam is seriously awful lol.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

lol..

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

the original idea to change the turbine housing came from having the WG coming straight off the current housing, and it being in a bad position when the turbo gets turned to face forwards. Turbodaves.com has quoted $450 for the 1.10 housing, plus $150 shipping to where i am in Australia.

I figured if I'm spending that much why not go bigger.. If the 1.32 S400 i have now can support that i'll look into another 1.32 housing. depending on cost, it'll either be that or the 80mm S400

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Call Jose at Forced Inductions . I think you can upgrade your S475 / 1.32/96 to his new Billet 80mm for $ 450 . Add the Race Cover and now you REALLY have a bad ass turbo . Probablly the badest 80mm out there .


OH YEA !!!!

Stay away from Turbo Daves !!!!!!!!

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Ah, gotcha. Yeah, definitely need the bigger turbine with that many cubes. A smaller turbine works, but leaves a lot on the table. The 80 should make around 1000 to the tire.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Just out of curiousity, what are your cam specs?

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

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Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

Interesting, a little tighter lsa than I expected.

 

Re: Going to a larger turbo/ changing pipes, need some advice please 383 sbf/Falcon C

that sounds real interesting. What is his username on here?