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Old 04-19-2011, 07:45 AM   #1
kjtyo4
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Default Turbo

I was wondering on putting a turbo on my sohc engine after I rebuild it. I do know it can be done because my dad had a spectrum turbo that had a a 1.5 liter in it with a turbo factory installed so I know it can be done and run good with the proper tunning with a 1.9 liter.
what kind of turbo should I put in it?
thanks
kenny.

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Old 04-19-2011, 07:58 AM   #2
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Default Re: Turbo

Swap a DOHC in for much less hassle, more reliability, and the same amount of power as a turbo DOHC.
SOHC + 5-8psi = ~30hp increase to ~130-135hp. $3k-$4k
DOHC + bolt-on's = 5-10hp increase to 130-135hp. ~$500
DOHC + 5-8psi = ~50-70hp increase to 170-180hp. $3k-$10k+ (depending on how much power you want)
Depends on your tune with MegaSquirt or some other stand alone computer as well, no way to do anything with the stock one. People are working sporadically on the 1st gen PCM's but I don't think they've gotten anywhere useful.

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Old 04-19-2011, 09:35 AM   #3
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Default Re: Turbo

meant "turbo SOHC" in that first line...evil edit window

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The proper way to fix a S-Series automatic is to replace it with a 5spd O:)

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Old 04-19-2011, 03:46 PM   #4
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Default Re: Turbo

As mentioned, of course you can turbo a SOHC, but it's not worth it at all. First step of any decent turbo S-Series build is a DOHC swap, and if that sounds like more than you can handle, then a turbo setup is more than you can handle as well.

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Old 04-19-2011, 05:40 PM   #5
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Default Re: Turbo

Quote:
Originally Posted by PurdueGuy View Post
First step of any decent turbo S-Series build is a DOHC swap....
And if the SOHC car is running well, the best way to do this is as a car swap. IOW, sell the SOHC car and buy a DOHC car. With today's gas prices (and the way they're going), good-running SOHC cars are desirable, and the difference in price between an SOHC car of a given age, condition, mileage, etc. and its DOHC counterpart is almost nil. Another option is to keep the SOHC car as a daily driver / parts chaser, since the turbo car can be expected to spend most of its time (esp. initially) on stands.

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Old 04-19-2011, 07:44 PM   #6
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Default Re: Turbo

Quote:
Originally Posted by kjtyo4 View Post
I was wondering on putting a turbo on my sohc engine after I rebuild it. I do know it can be done because my dad had a spectrum turbo that had a a 1.5 liter in it with a turbo factory installed so I know it can be done and run good with the proper tunning with a 1.9 liter.
what kind of turbo should I put in it?
thanks
kenny.
it's funny how often this question comes up. let me answer it with another... how much money do you have to spend on this install???


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Old 04-19-2011, 09:21 PM   #7
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Default Re: Turbo

uhhh, he gonna need about tree-fiddy

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Old 04-20-2011, 12:10 AM   #8
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Default Re: Turbo

I was just wondering how hard it would be.I was told that the dohc had alot of problems with head gaskets. thats why i was going to stick with the sohc motor. would a dohc motor bolt up to the 5 speed i have know?
thanks
kenny

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Old 04-20-2011, 06:21 AM   #9
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Default Re: Turbo

It's not the DOHC with the problems....it's the SOHC. Either it cracks the head or you have to do the intake manifold gasket properly as the robot failed on most of them '00+. Might have head gasket problems with the DOHC at 300-500hp....but the SOHC will never see more then 200hp from what I've seen/read.

It'll bolt up fine but you'll lose cruise control. Saturn saved $0.50/car on the '96+'s by changing a physical switch on the clutch pedal to programming in the PCM.

...
The proper way to fix a S-Series automatic is to replace it with a 5spd O:)

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Old 04-20-2011, 07:29 AM   #10
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Default Re: Turbo

I don't have cruse control know not with my 5 speed.
I am thinking of rebuilding a dohc and puting on in.
kenny

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Old 04-20-2011, 08:06 AM   #11
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Happy Re: Turbo

Quote:
Originally Posted by kjtyo4 View Post
I was just wondering how hard it would be.I was told that the dohc had alot of problems with head gaskets. thats why i was going to stick with the sohc motor. would a dohc motor bolt up to the 5 speed i have know?
thanks
kenny
where are you getting your information? the DOHC doesn't have any head gasket problems that I have heard of in my years 1992-2010 of Saturn ownership. your best bet is sell the SOHC and start with a DOHC then mod it. I mean sell the entire car, not swap the engine. swapping the engine at this point would be a waste of time and money. why bother modifying a 85-100 hp car when you can get a 124 hp car for cheap and it will come with better seats and suspension.

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Old 04-20-2011, 11:03 PM   #12
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Default Re: Turbo

If you are going to turbo ANY saturn s-series, you better have a LOT of money, time, and headache pills
It can be done but for anyone thats not rich, doesnt have very much free time, or doesnt have a huge passion to modify a saturn, its better off to find a different car

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Old 06-24-2011, 04:42 PM   #13
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Default Re: Turbo

Quote:
Originally Posted by fetchitfido View Post
Swap a DOHC in for much less hassle, more reliability, and the same amount of power as a turbo DOHC.
SOHC + 5-8psi = ~30hp increase to ~130-135hp. $3k-$4k
DOHC + bolt-on's = 5-10hp increase to 130-135hp. ~$500
DOHC + 5-8psi = ~50-70hp increase to 170-180hp. $3k-$10k+ (depending on how much power you want)
Depends on your tune with MegaSquirt or some other stand alone computer as well, no way to do anything with the stock one. People are working sporadically on the 1st gen PCM's but I don't think they've gotten anywhere useful.
What do you mean by Bolt-on's

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Old 06-24-2011, 04:51 PM   #14
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Default Re: Turbo

Bolt-on modifications:

Intake
Throttle Body
Header
Cat back
Popcorn Machine
Stickarz

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Old 06-25-2011, 01:37 PM   #15
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Default Re: Turbo

do the dohc swap and s/c it

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Old 06-25-2011, 02:55 PM   #16
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Default Re: Turbo

As been said a million times on these forums, keep the Saturn as a daily driver (or sell it if you need the money), and buy a turbocharged car. That's what I'm going to do. I'm keeping my good ol' bone-stock Saturn and buying a MazdaSpeed 3 when I scrap up enough dough.

If you THINK you have enough money to turbo a Saturn, either you're wrong and you don't, or you have enough money to buy a much nicer turbocharged car (WRX, MazdaSpeed, Eclipse/Talon, etc.). So if you don't have $5,000 laying around, just forget it altogether. If you do, buy a car that came from the factory with a turbo.

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Old 06-25-2011, 04:44 PM   #17
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Default Re: Turbo

Quote:
Originally Posted by aaron95sl2 View Post
As been said a million times on these forums, keep the Saturn as a daily driver (or sell it if you need the money), and buy a turbocharged car. That's what I'm going to do. I'm keeping my good ol' bone-stock Saturn and buying a MazdaSpeed 3 when I scrap up enough dough.

If you THINK you have enough money to turbo a Saturn, either you're wrong and you don't, or you have enough money to buy a much nicer turbocharged car (WRX, MazdaSpeed, Eclipse/Talon, etc.). So if you don't have $5,000 laying around, just forget it altogether. If you do, buy a car that came from the factory with a turbo.
and then be like every one else lol individuality is why my saturn is s/c, its easy to just go out and by a factory turbo car but then theres no satisfaction in it just my 0.02

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Old 06-25-2011, 04:51 PM   #18
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Default Re: Turbo

Quote:
Originally Posted by aaron95sl2 View Post
If you THINK you have enough money to turbo a Saturn, either you're wrong and you don't, or you have enough money to buy a much nicer turbocharged car (WRX, MazdaSpeed, Eclipse/Talon, etc.). So if you don't have $5,000 laying around, just forget it altogether. If you do, buy a car that came from the factory with a turbo.
I'd like to know where I can find a good WRX for $5k.

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Old 06-25-2011, 07:44 PM   #19
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Default Re: Turbo

Quote:
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I'd like to know where I can find a good WRX for $5k.
It was a ballpark figure, and obviously referring to USED vehicles (unless you can find me a brand new SL2). Really, I know nothing of WRXs, but thanks for missing my point.

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Old 06-25-2011, 07:46 PM   #20
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Default Re: Turbo

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Originally Posted by shadowspiyre99 View Post
and then be like every one else lol individuality is why my saturn is s/c, its easy to just go out and by a factory turbo car but then theres no satisfaction in it just my 0.02
The type of "individuality" you speak of is expensive. And people don't buy Saturns because they're rich.

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