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Old 04-10-2012, 01:29 AM
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Budget HP gain with no loss in MPG?

Hey guys
I have a Firebird with a 305 (Yes a 305, not a 350, i dont want a 350). I really want to increase my HP since its absolutely horrible (135HP), but i also don't want it to affect gas mileage. I have attached links to parts I want to go and get, I only have a budget of around $800. Any suggestions would also help. Im only 17 so my budget cant really go past that $800 limit and I can barely afford the gas right now.(It took me forever to save for these parts!) Also, if i only got that exhaust system and header combo, how much HP increase can i expect? And how much gain from all of these? Im new to this restoration scene so any ideas help! Thanks!

http://www.summitracing.com/parts/CMB-05-0014/

http://www.summitracing.com/parts/GRN-36-1595MPG/

http://www.summitracing.com/parts/SUM-850030/

http://www.summitracing.com/parts/ETP-E3-42/

http://www.summitracing.com/parts/KNN-E-1650/

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Old 04-10-2012, 02:58 AM
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For starters dump the E3 spark plugs and get plain AC Delcos. The E3's are gimmick plugs just as the "split fire" plugs were and do absolutely nothing to help performance or mileage. I also wouldn't bother with the exhaust system. Yeah while it might look nice, looks aren't the focus here. I would get a set of full lenth headers that are of 1.5 inch primary size as that's all a 305 needs. I would have a exhaust shop run dual pipes into turbo mufflers. That alone will save you considerable money compaired to the kit.
I think it was me who made these suggestions to you and so far your on the right track. I wouldn't waste my money on the plug wires you've chosen either. Get a set of Moroso Blue max spiral core plug wires with 800 ohms resistance. They will cost you considerably less than the ones you have chosen. Next is how many miles are on the given engine? If it's over 50,000 you will need to install a timing chain, and the money you will save on the tips I gave you, you'll have plenty of money left over to afford a timing chain and then some.

Last edited by DoubleVision; 04-10-2012 at 03:20 AM.
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Old 04-10-2012, 03:14 AM
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Here are the pieces I would recommend.
http://www.summitracing.com/parts/BIG-11108FLT/

http://www.summitracing.com/parts/MOR-72522/

http://www.summitracing.com/parts/WLK-17713/

http://www.summitracing.com/parts/CLO-9-1100/

The spark plugs you can pick up yourself at your local parts store.
Your car should use AC Delco R45TS or there abouts.
If you have a advance auto parts near you also you can get these same mufflers as I have listed here there also. Just ask the shop who will install the system what type of entrance and exit placement needs to be. I figure it'll be center entrance offset outlet.

Last edited by DoubleVision; 04-10-2012 at 03:20 AM.
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Old 04-10-2012, 08:07 AM
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Like Double said, put some headers and free flowing exhaust on that 305. Other than that, anything you do will affect mpg more than gain power.
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Old 04-10-2012, 09:23 AM
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Explain exactly your immediate and long term goals for this car. What is it's intended purpose?

Also, if i may be so bold, i would be concentrating strictly on school work and leaving the car alone if it runs ok. (yes, i am your father )
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Old 04-10-2012, 09:41 AM
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if you want power and mileage get a set of headers as described and a cheap free flowing exhaust. Then get a fuel injection setup and a megasquirt system. Your power and mileage will go up.
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Old 04-10-2012, 10:38 AM
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Quote:
Originally Posted by 79bird
Hey guys
I have a Firebird with a 305 (Yes a 305, not a 350, i dont want a 350). I really want to increase my HP since its absolutely horrible (135HP), but i also don't want it to affect gas mileage. I have attached links to parts I want to go and get, I only have a budget of around $800. Any suggestions would also help. Im only 17 so my budget cant really go past that $800 limit and I can barely afford the gas right now.(It took me forever to save for these parts!) Also, if i only got that exhaust system and header combo, how much HP increase can i expect? And how much gain from all of these? Im new to this restoration scene so any ideas help! Thanks!

http://www.summitracing.com/parts/CMB-05-0014/

http://www.summitracing.com/parts/GRN-36-1595MPG/

http://www.summitracing.com/parts/SUM-850030/

http://www.summitracing.com/parts/ETP-E3-42/

http://www.summitracing.com/parts/KNN-E-1650/

One way to get some free hp is to center the sparkplug "gap" to the center of the intake valve.
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Old 04-10-2012, 10:49 AM
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as everyone has advised you, ditch the exhaust system, wire, plugs, and i would ditch that distributor as well. the headers and mufflers recomended above would do good. below i have listed the distributor that i would recomend. i use this exact distributor on my street/strip 385cid 87 camaro.




http://www.skipwhiteperformance.com/...?Item=PE-322-B


and as mentioned above a new timing chain is probably in order as well.

if after that you find your self with some extra cash you could save up for another intake, carb and maybe some #416 305HO heads.
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Old 04-10-2012, 02:04 PM
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Quote:
Originally Posted by against all odds
Explain exactly your immediate and long term goals for this car. What is it's intended purpose?

Also, if i may be so bold, i would be concentrating strictly on school work and leaving the car alone if it runs ok. (yes, i am your father )
Im using the car as a daily driver to school and back, but its definitely my baby
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Old 04-10-2012, 03:00 PM
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Quote:
Originally Posted by DoubleVision
Here are the pieces I would recommend.
http://www.summitracing.com/parts/BIG-11108FLT/

http://www.summitracing.com/parts/MOR-72522/

http://www.summitracing.com/parts/WLK-17713/

http://www.summitracing.com/parts/CLO-9-1100/

The spark plugs you can pick up yourself at your local parts store.
Your car should use AC Delco R45TS or there abouts.
If you have a advance auto parts near you also you can get these same mufflers as I have listed here there also. Just ask the shop who will install the system what type of entrance and exit placement needs to be. I figure it'll be center entrance offset outlet.
Will those headers fit my car? I know the Firebird and Camaro are the same, but just want to be sure?
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Old 04-10-2012, 03:23 PM
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Yes, they'll fit. It's a F body, identical to the camaro. They both used the same sub frames, the only difference was the front and rear clips.
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Old 04-11-2012, 10:12 PM
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In that case, i'm not exactly sure why you need to jazz it up if you can barely afford the gas?
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Old 04-11-2012, 11:36 PM
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The big things holding you back are the heads/compression. That's tough to overcome in a 305 on your budget. It pretty much requires either milling the heads way down or rebuilding the shortblock with different pistons. Its also one of the reasons everyone says "get a 350" because for $800 in a 305 you can chase hp, bust knuckles, and curse a 305... or for $500 you can buy a good running Vortec 350 that comes from the factory with 275 hp, or make your own with a Vortec longblock, a vortec carb intake from Ebay (bought mine for $35 off a crate engine) and re-tune your carb/distributor to make it work.

Swapping an engine is also no more work than swapping heads... maybe less work.

But... if you want to spend $800 on the 305, get headers, free-flowing exhaust, and intake. You'll gain 15 hp and not lose any MPG. Or, for $800 you could do a vortec 350 swap, DOUBLE your HP, and potentially gain MPG.
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Old 04-12-2012, 07:55 AM
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Quote:
Originally Posted by 79bird
Yes a 305, not a 350, i dont want a 350
You can pick up a used 350 for less than $500. Which, if you get the right one will get you more power than all the other mods you have planned, AND get better mileage.

Used 350's are crazy cheap, and the 305 you have is NOTHING special.
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