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HELP ME OUT - need easy tuning tips for 305 LG4 carb motor

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Old 05-10-2004, 01:20 AM
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Car: 1985 Trans-am
Engine: LG4 160bhp carb
Transmission: 3 sp auto + od good for 130mph
HELP ME OUT - need easy tuning tips for 305 LG4 carb motor

Hi All,

This is my first post in thirdgen & I hope you are ready to give me a little help....as I need it

Yesterday I purchased a 1985 5.0 Trans-am auto as my first american car. (I'm in the UK). Now its the 160bhp carb model with the LG4 motor and apart from a new stainless exhust its 100% Bog stock.

First
Please post any easy (low cost) mods to get a little more power out of the beast.....it does need more power for sure! but still cracked 120mph on the way home...just. I'm not looking for a race setup.... lets just say I'd like to make 200bhp

Second
If there are any Mags worth subscribing to relevent to my car let me know

I look forward to reading the replys

Cheers
Fin
Old 05-27-2004, 06:09 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Well, we've been a lot of help here on this side of the pond, haven't we?

Check out the tech articles on the base forum www.thirdgen.org . There's one on getting the most out of your q-jet.

About the only thing to add to what it said is it often helps to advance the base ignition timing over what the factory called out. Assuming you have a computer controlled q-jet, 6 degrees vs. the factory spec zero degrees can make a nice difference.

From your other post, you've already improved air cleaner flow. A 2nd snorkel would help even more.

After that, you're beyond tuning and into modification. Exhaust is a biggie. Then you're looking at cam change, head porting, etc., to improve beyond that.
Old 05-27-2004, 06:20 PM
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Car: 1985 Trans-am
Engine: LG4 160bhp carb
Transmission: 3 sp auto + od good for 130mph
Thanks for that,

I've played with the secondarys a little and have them just about right,

I'll have a go with the other tip, I've also removed the smog pump belt which seamed to make alot of differance.

The car has a £550 rebel powerflow exhurst system......ITS NOT VERY WELL MADE AT ALL. the bend over the Diff is all kinked the Y pipe is a T....all the bends seam to srink in DIA

So I now need a nice set of headers and I'd then like to make my own dual exhurst system...

Its all good fun

Cheers
Fin
Old 05-27-2004, 09:44 PM
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Car: 83WS6TA
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Welcome to the boards. I got drunk a few times in Lincoln but then I can say that about most places I've been.

As for magazines forget it. Buy a shop manuel and search on here for information as needed. Cross check the responses though if your not sure because while there's a lot of good information on this site nevertheless there are some people who couldn't find their backsides with both hands.

An LG4 will respond well to a proper exhaust system as previously mentioned.
Old 05-28-2004, 07:43 AM
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Car: 1984 LG4 Camaro
Engine: 350 Roller Motor
Transmission: Level 10 700R4
Axle/Gears: Strange 12 bolt 3.42
Check out my webpage or the articles I wrote that are posted on this site.
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