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Nux Nux is offline
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3.2SS turbo conversion

Disclaimer: I know nothing of turbos. But have been reading a lot lately. So please bear with me here.....

I currently have a 3.2SS. It's running ITB's today with MS EFI. DC20 cams. 9.3CR (measured). Single plug.

I also have two shiny new Garret T3 turbos on my desk.......and I can't really stop thinking about turbo'ing my 3.2SS

Can I run a low boost setup with a CR of 9.3? Do I need an intercooler?

Or should I get it out of my mind ?
Old 09-05-2018, 04:50 AM
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definitely intercooler imo. and maybe E85?
Old 09-05-2018, 04:55 AM
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Al gas here (Northern Europe) has 5% bioethanol.

And 100 RON octane (around 96 octane for you guys) is available
Old 09-05-2018, 05:00 AM
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What is your lobe separation angle on your cams? If it's 112-114, IMO, you are fine. If you have like a 102-108, cylinder pressure plus your compression ratio might be a little high and detonation will be a possibility without retarded timing.

Longer LSA's bleed cylinder pressure, hence 112-114 is better for boosted applications. Plus, you getter a broader torque curve.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 09-05-2018, 05:41 AM
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113 lobe on the dc20's. I'm adding ignition to my MS2, so timing shouldn't be an issue.
Old 09-05-2018, 05:49 AM
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Quote:
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113 lobe on the dc20's. I'm adding ignition to my MS2, so timing shouldn't be an issue.
Well, what are you waiting for?!

Going to be one of those, "why didn't I do this sooner?!".
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 09-05-2018, 07:02 AM
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Haha cool!!!

What about those turbos: are they correct for the application? I guess I really don't need two right?

Car weighs 2100lb, so 350hp would be....interesting!
Old 09-05-2018, 07:29 AM
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Haha cool!!!

What about those turbos: are they correct for the application? I guess I really don't need two right?

Car weighs 2100lb, so 350hp would be....interesting!
No, not at all. I'd sell them for a larger one. Get a Garrett GT35R and you won't regret it. Or, I'm a fan of the Borg-Warner S360 or S362.

I'd be confident with revving your motor higher (whole point of SS, right?) plus the cams you have, as long as it's big port heads (not sure if you are basing on big port 3.0 or not?), I'd think you'd be closer to 375 hp at 0.5 bar???

After all, higher RPM makes more power as long as the components match the airflow requirements needed.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 09-05-2018, 08:06 AM
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If all you are shooting for is 350hp, then you might only need one of your t3 turbos, depending on which model it is. All you need is 38-40lbs of air. Twin turbos add complexity and cost.
If it is in your budget, you should definitely consider twin plugging the heads. Also, 9.3-1 compression might be a bit much for a turbo, but depending on your pistons, you might be able to knock some of the dome off without making the piston too thin.
Old 09-05-2018, 08:12 AM
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Quote:
Originally Posted by Tippy View Post
No, not at all. I'd sell them for a larger one. Get a Garrett GT35R and you won't regret it. Or, I'm a fan of the Borg-Warner S360 or S362.

I'd be confident with revving your motor higher (whole point of SS, right?) plus the cams you have, as long as it's big port heads (not sure if you are basing on big port 3.0 or not?), I'd think you'd be closer to 375 hp at 0.5 bar???

After all, higher RPM makes more power as long as the components match the airflow requirements needed.
375!? Ay Caramba!

I've got the big port heads. Rev limit is set at 7000 now.

Will look into those turbos you mention. Thanks!
Old 09-05-2018, 08:13 AM
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Quote:
Originally Posted by Ollies930 View Post
If all you are shooting for is 350hp, then you might only need one of your t3 turbos, depending on which model it is. All you need is 38-40lbs of air. Twin turbos add complexity and cost.
If it is in your budget, you should definitely consider twin plugging the heads. Also, 9.3-1 compression might be a bit much for a turbo, but depending on your pistons, you might be able to knock some of the dome off without making the piston too thin.
I rebuilt the engine 1500 miles ago, so would hate to open it up again, unless it is absolutely required.

It has the wegde shaped max moritz pistons, so twin plug is not an option unless I change the pistons.
Old 09-05-2018, 08:59 AM
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I had basically a 3.2 short stroke. 97mm pistons and cylinders in a 3.0sc block. Compression was 9.5:1. I was running 10lbs Of boost which was good for 403hp 360tq. I tore 2nd gear clean off th shaft. No detonation, no twin plugging, etc. if you can tune the ignition maps properly, it’s quite safe to run more boost. See my signature below for list of modifications.
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Old 09-05-2018, 09:52 AM
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You would be nuts not to intercool it. If you're worried about space I'd run a WTA set up. More compact than ATA and lets you package some weight at the front of the car.
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Old 09-05-2018, 04:04 PM
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Quote:
Originally Posted by scottrx7tt View Post
I had basically a 3.2 short stroke. 97mm pistons and cylinders in a 3.0sc block. Compression was 9.5:1. I was running 10lbs Of boost which was good for 403hp 360tq. I tore 2nd gear clean off th shaft. No detonation, no twin plugging, etc. if you can tune the ignition maps properly, itís quite safe to run more boost. See my signature below for list of modifications.
What cams??? WHP or FWHP?

Last edited by Tippy; 09-05-2018 at 06:21 PM..
Old 09-05-2018, 06:18 PM
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Quote:
Originally Posted by Uncle View Post
You would be nuts not to intercool it. If you're worried about space I'd run a WTA set up. More compact than ATA and lets you package some weight at the front of the car.
hmmm that may be good idea. I'm guessing such a system ads quite a bit of weight?

And any recommendations for size of the IC (both air and water)?

Last edited by Nux; 09-05-2018 at 10:24 PM..
Old 09-05-2018, 10:21 PM
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what gearbox?
Old 09-06-2018, 02:59 AM
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what gearbox?
915....so not really interested in too much HP.
Old 09-06-2018, 03:14 AM
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915....so not really interested in too much HP.
This is where the larger turbos might actually help. Too small of turbo, and your down low torque is easily going to turn your 915 into metallic soup.

Problem is, all the big turbos are even spooling sooner than the yesteryears....
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 09-06-2018, 05:41 AM
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S360 with a 3.2SS and 964 cams, power delivery is awesome and super manageable. Current setup is 9.5:1 JE's with single plug, but am now converting to twin plug since the heads will be off for a refresh anyway. Was scheduled for a dyno session a few weeks back but was unable to make it for other reasons.
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Old 09-06-2018, 10:56 AM
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S360 with a 3.2SS and 964 cams, power delivery is awesome and super manageable. Current setup is 9.5:1 JE's with single plug, but am now converting to twin plug since the heads will be off for a refresh anyway. Was scheduled for a dyno session a few weeks back but was unable to make it for other reasons.
Thats pretty damn close to my core setup. The DC20's are a little hotter (more like the Supercup) than the 964's.

Another happy S360 user then. What size wastegate are you using, 46?
Old 09-06-2018, 01:32 PM
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