TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

lo3 + gt45?

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Old Dec 13, 2011 | 05:30 PM
  #1  
kill4thril's Avatar
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From: liverpool ny
Car: 1990 firbird formula
Engine: 355ci
Transmission: t56 spec3+ cluch
Axle/Gears: 9 bolt disc brake 2.77
lo3 + gt45?

Ok so I'm turboing my stock inturnals 305 it has 81000 miles on it and I was just looking to get some imput on what you guys think like how long will the motor run and such. I'm only going with 8to 10 psi.
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Old Dec 13, 2011 | 06:49 PM
  #2  
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Re: lo3 + gt45?

this will all depend on your foot and brain. i would do a compression check on the engine first. also does it smoke any at all even just on start up. it will also count on keeping the rpm's in the stock range. this is just the engine part. im sure people will tell you that the l03 like i have is a dog. which it really is. the 3 things i believe will help the best.
1. be smart about it
2. dont expect it to be real fast afterwards
3. expect things to break.
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Old Dec 13, 2011 | 06:55 PM
  #3  
jahblah's Avatar
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Posts: 287
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From: NC
Car: 87' Firebird Formula
Engine: 350
Transmission: 700r4
Axle/Gears: 3.73
Re: lo3 + gt45?

Originally Posted by one92rs
this will all depend on your foot and brain. i would do a compression check on the engine first. also does it smoke any at all even just on start up. it will also count on keeping the rpm's in the stock range. this is just the engine part. im sure people will tell you that the l03 like i have is a dog. which it really is. the 3 things i believe will help the best.
1. be smart about it
2. dont expect it to be real fast afterwards
3. expect things to break.
amen to that
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Old Dec 14, 2011 | 03:42 AM
  #4  
dimented24x7's Avatar
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: lo3 + gt45?

With low boost and the anemic stock output, the engine probably wont be the issue unless its run real lean or something. The trans may cause some headaches, though. The T5 isnt real strong, and wont stand up to a lot of torque. Doubly so with numerically low gears out back.

As for the power, youd be MUCH better off just modding the engine. Theres 5 liters of displacement thats hardly even being used. The only real restriction with a 305 is the small bore which places some limitations on the size of I/E valve and lift you can run.

Some good heads, a modest cam, good induction and exhaust will really wake the motor up. A turbo setup with nothing else will still be slow. It'll also be totally undrivable if you dont switch the ECM to something better and tune it.
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Old Dec 14, 2011 | 10:47 AM
  #5  
kill4thril's Avatar
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From: liverpool ny
Car: 1990 firbird formula
Engine: 355ci
Transmission: t56 spec3+ cluch
Axle/Gears: 9 bolt disc brake 2.77
Re: lo3 + gt45?

I have the ebl flash and I'm port and polishing the stock heads till next winter when I can get the forged inturnals and a nice pair of vortec heads and maybe lt1 cam
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Old Dec 14, 2011 | 03:34 PM
  #6  
jay7199's Avatar
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Re: lo3 + gt45?

The lt1 cam is so cheap and easy... I have sold 3 LT1 cams for $30's Its too bad my vette is a flat tappet otherwise id have put one in it.
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Old Dec 14, 2011 | 07:47 PM
  #7  
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From: league city
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Re: lo3 + gt45?

darnit i need an lt1 cam.
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Old Dec 14, 2011 | 09:12 PM
  #8  
Ron_90's Avatar
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From: Baltimore, Maryland
Car: '90 RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 2.73 Open
Re: lo3 + gt45?

Originally Posted by one92rs
darnit i need an lt1 cam.
If LT1 cars are scarce at your local junkyards try emailing this guy http://nashville.craigslist.org/pts/2742358190.html

To search craigslist ads nationwide you can use this: http://www.allofcraigs.com/
-How I found my $25 headers (well, $47 after shipping)
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Old Dec 14, 2011 | 10:01 PM
  #9  
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Re: lo3 + gt45?

welllll i could use some money... I have one lt1 cam left.. its a bit rusty though.. notthing a oil bath wouldn't take care of. PM me.
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