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Old 06-06-2018, 03:48 PM   #1
RoninDusette
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Default 2001 SL SOHC: Boost or DOHC swap and boost?

Hi! First post here. Now, I know right off the bat that the DOHC is the way to go, but I am no stranger to custom turbo kits, and don't really want a lot of boost. I am building a REALLY fast CRX (boosted b20 vtec 4wd. hehe), but I want to make my DD a little more fun to drive.

First question is; where would I find a turbo exhaust manifold for this thing? I mean, there has to be SOMEONE out there that makes them, but in my searching, I haven't found anyone yet.

On the flip side, I am not against swapping out the SOHC for the DOHC, as long as it's not a nightmare to do. Any links/tutorials out there for this swap? Also, if I swap, I will likely rebuild the engine before it goes in, so where are some good performance parts manufacturers for the DOHC engines of the later years (2001 is what I am rocking right now)? I figure if I am going to swap, I will at least put a light build in there too. Dough isn't really an issue. More just curious what is needed to swap from SOHC to DOHC on these cars (Hondas require very little depending on the series, so I am hoping this will prove true too for a Saturn. lol).

Thanks everyone!
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Old 06-06-2018, 10:44 PM   #2
Macgyver
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

Typically, you swap to DOHC as I've never seen a SOHC turbo setup per say. There are OBX manifolds on ebay to add T3 turbos. The manifold is the easy part, you need to figure out fuel delivery. There are very little performance parts for the S series these days.

I assume you already have several grand to do this? The ratio between people that talk about boosting their Saturn and actually come back on here with pictures saying it's running/setup are probably 1 in 5000.
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Old 06-07-2018, 09:27 AM   #3
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

Since you are doing a CRX, seems like you know what you are doing. A lot of folks freak out over mention of tuning a megasquirt / fuel tuning.
Quote:
Originally Posted by Macgyver View Post
I assume you already have several grand to do this?
And lots of spare time. The two don't usually go together because Time = Money

If you have several grand to do this, you are quite frankly much better off buying a different car. Instant increase in power / fun quotient, likely increased safety, and save a bunch of time and hassle. I say this as a long time fan of Saturn S-Series cars.

If you insist, browse this a bit:
http://www.differentracing.com/

The swap info is found under the tech articles
http://www.differentracing.com/tech_...dohc_swap.html

You'll also need to introduce the PCM to BCM, instructions are on this site.
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Old 06-07-2018, 09:42 AM   #4
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

Not many people made performance S-Series parts when they were popular, now just about the only one's you'll get are what you can create in your garage.

The best SOHC engine I've heard about only made 180hp while the average boosted DOHC makes 250 (highest I know of was pushing 600hp), so if power is what you're after don't bother with the SOHC. It's head flows air about as well as a sealed & insulated brick wall.

Granted the SOHC cars weigh less than the DOHC cars but a large portion of that is 'factory' performance stuff like larger front sway bar and the added rear sway bar as well as heavy 'factory options' as default (like A/C, power locks/windows and power steering).

I think a 4G63 manifold, with slight modifications, is the cheapest turbo manifold you'll find though I'd skip on the factory cast iron hunk of crap as it cracks between runners 2 & 3 simply because you looked at it.

SOHC -> DOHC swap is simple, hardest part is keeping the right exhaust manifold & downpipe to match up with the cat-back and normally I'd suggest running away from a 3rd gen to modify because of the PCM/BCM combo but you'll be going with a standalone anyway so those problems don't matter.
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Old 06-07-2018, 10:25 AM   #5
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

Quote:
Originally Posted by fetchitfido View Post

I think a 4G63 manifold, with slight modifications, is the cheapest turbo manifold you'll find though I'd skip on the factory cast iron hunk of crap as it cracks between runners 2 & 3 simply because you looked at it.
1G manifolds yes, they're all cracked. Here's a pic of my old one:



2G manifolds don't crack and flow better. Here's my 2g manifold after I ported it and cleaned it up:





Also, for what it's going to cost you to boost a Saturn you're better off putting that money towards the CRX (and post some pics! ) and just daily the Saturn.
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Old 06-07-2018, 11:00 AM   #6
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

For a couple of grand, you can buy a nice SC2, SL2, or SW2. Sell the SL1 to recoup most of that money.

Instant DOHC swap, zero down time, zero time spend sourcing parts, and you get some bonus accessory, seat, and suspension upgrades.
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Old 06-07-2018, 04:34 PM   #7
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

Leave the DD alone.

By definition, you don't modify the DD, you have a project car to mess with.
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Old 06-10-2018, 10:32 AM   #8
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Default Re: 2001 SL SOHC: Boost or DOHC swap and boost?

Quote:
Originally Posted by RoninDusette View Post
Hi! First post here. Now, I know right off the bat that the DOHC is the way to go, but I am no stranger to custom turbo kits, and don't really want a lot of boost. I am building a REALLY fast CRX (boosted b20 vtec 4wd. hehe), but I want to make my DD a little more fun to drive.

First question is; where would I find a turbo exhaust manifold for this thing? I mean, there has to be SOMEONE out there that makes them, but in my searching, I haven't found anyone yet.

On the flip side, I am not against swapping out the SOHC for the DOHC, as long as it's not a nightmare to do. Any links/tutorials out there for this swap? Also, if I swap, I will likely rebuild the engine before it goes in, so where are some good performance parts manufacturers for the DOHC engines of the later years (2001 is what I am rocking right now)? I figure if I am going to swap, I will at least put a light build in there too. Dough isn't really an issue. More just curious what is needed to swap from SOHC to DOHC on these cars (Hondas require very little depending on the series, so I am hoping this will prove true too for a Saturn. lol).

Thanks everyone!
If you want to make the Saturn DD more fun to drive, just swap a DOHC into it and leave fairly stock. The DOHC is a lot of fun to drive, with minimal modification to it. Add the MP3 5-speed manual to this engine, and you will have a 16s -mile car, stock.

Or, keep the SOHC and swap the MP3 transmission into it. While this doesn't increase your engine's power output, it will improve lateral acceleration from gear ratio torque multiplication, and make the car a little more fun to drive.
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