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Old 02-05-2008, 11:57 PM
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twin turbo 305.

i was thinking about doing a twin turbo on my 305. (86 monte carlo)

aftermarket intake and cam. and some 350 heads. probably stock bottom end.

im debating whether to stroke it to a 335 or leave it be. (probably be stronger as a 305)

how many pounds of boost do you think the engine could take and what kind of power would i make estimate?


also a quadrojet cant be used with a turbo setup correct?
what would be a good carb choice?

this is the twin turbo kit http://cgi.ebay.com/ebaymotors/Chevy...spagenameZWDVW

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Last edited by F3RR3T; 02-06-2008 at 12:04 AM.
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Old 02-06-2008, 01:14 AM
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No offense but I wouldn't waste the moooocho $$$$$$ to do a dual turbo on a 305. Build a good stout 355" with forged internals if you want to make some serious reliable 'horse pressure".
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Old 02-06-2008, 01:18 AM
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my reasoning is that one if the 305 grenades its easy to swap in a 350 short-block.

i would like to see the what the 305 can do. i know there is one guy in the 9's with one (runs a late model camaro)
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Old 02-06-2008, 01:30 AM
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It's your money but I'll bet that 9 sec. car doesn't have a stock bottom end or much other stock parts. You start putting the boost to cast pistons and cast crank.......did you say "Grenade". Now if you run minimal boost it will probably be ok but thats not what you want. All you can do is try it and see what happens. I'm sure the turbo mfg. could recommend a proper carb for their unit.
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Old 02-06-2008, 01:34 AM
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Quote:
Originally Posted by 327NUT
It's your money but I'll bet that 9 sec. car doesn't have a stock bottom end or much other stock parts. You start putting the boost to cast pistons and cast crank.......did you say "Grenade". Now if you run minimal boost it will probably be ok but thats not what you want. All you can do is try it and see what happens. I'm sure the turbo mfg. could recommend a proper carb for their unit.
o defiantly not getting a 9 out of my car. maybe a 12.
basically the 305 is a test before i swap in the 350 short block (i need to rebuild it)

i figured its there already mine as well see what she can take. (low mileage motor its only got 43k on her my dads the orginal owner had it since 86
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Old 02-06-2008, 05:56 AM
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Get the book Maximum Boost. Many secrets revealed in there.

http://www.amazon.com/Maximum-Boost-.../dp/0837601606
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Old 02-06-2008, 07:13 AM
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first, don't use a carb. You really need to use fuel injection. Go to Megasquirt.com. They have cheap diy efi systems. Get a system with ignition timing control and low impedance injectors drivers


If you want to go cheap, get a used turbo off a 280zx turbo. It is a T3 turbo with a bolt on wastegate set at 7 or 8 psi. Can be increases to a higher pressure easily. Plus these turbos boost really quickly on a 168 cid engine which would make 2 of them work great on a 305 (152.5 cid each) You can also find turbo exhaust manifolds on ebay for a sbc. get the ones with a T3 flange. The turbo manifolds mount the turbos at valve cover height.

The power the engine will make on boost depends on how much it was making before the turbo. The amount of boost is a multiplier on the base hp.

The formula is for the multiplier is (boost + 14.7)/14.7

so if you run 10 psi of boost..... (10 + 14.7)/14.7 = 1.68

and if your 305 is making 180hp/250ftlb then at 10 psi would make 302hp/420 ftlbs. hp is not so good but you will feel that torque! Of course, this assumes you have the properly sized turbo and fuel/timing control.

so you really need to make as much hp before the turbo is added. use a small turbo cam, do a little bowl work in the heads, run a set of dynomax mufflers, ect.

if you can make a 7.5:1 cr 305 that makes around 225hp/275ftlbs then add 14 psi of boost with an intercooler, then you could make 440hp/530ftlbs.

The nice thing about a small turbo setup on on a mild engine is the gears and converter can be stock. 1400 rpm stall converter and a set of 2.73's will work great.

good luck with your project.
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Old 02-06-2008, 10:19 AM
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efi is out. im really don't feel like screwing with it. more $$ maybe later down the road
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Old 02-06-2008, 10:48 AM
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you can manage around 15 psi boost before you start pushing head gaskets. for turbos you would be good running nissan turbos off a z car, or a turbo off of a volvo diesel 5cyl. look at the smaller turbos they will spool up quicker and give you more power on the lower end where you spend the most time. i would suggest you get a single small turbo and just tune the waste gate.

as far as aftermarket cam and intake, your other posts suggested that your budget was a bit limited. i would recomend getting a single turbo, hooking it up and getting the most out of it with what you already have on your engine. IF AND ONLY IF you can get that to work well look at another turbo.

theres a whole lot of work getting a turbo set up and connected and plumbed, and having all the oil and coolant lines run to them.

like someone already said, get a book and see whats involved.
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Old 02-06-2008, 05:47 PM
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You would be money ahead starting with a lower compression motor. The l69 305 has 9.5:1 compression stock and will not like any kind of boost. Sure, you could run it until it dies but what happens to your turbos when you start pushing melted piston pieces through them? Do it right the first time.

Greg
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Old 02-06-2008, 05:59 PM
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Put your money into a better engine,Like a 350!!!!
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Old 02-06-2008, 06:00 PM
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if i were to upgrade engines it would be a 327
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Old 02-06-2008, 06:10 PM
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Thats not bad!!They have made good hp!!(375hp)
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Old 02-06-2008, 06:15 PM
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If you're going to spend thousands and thousands on a twin turbo setup, why not spend an extra $500 and upgrade to a 350 while you're at it? You can only polish a turd so much.
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Old 02-06-2008, 07:48 PM
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do what you do man who cares run that **** 305 350 your car
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