I'm gonna buy a spare engine and build it up, but which is better to go with?? how hard is 200hp from either of them?? I'd like to get around there and the 15 sec mark with gears a torque convertor custom exhaust and ignition i think it shouldnt be too hard. how much should I look to pay for either of these?? Which one has more aftermarrket parts??
thanks alot!!(especially ked85 cause I'm sure you'll have plenty of help for me

 

The 3.4 would probably be your best shot, but I'm not sure how thick the cyl walls are, so with the compression you're thinking of running, it might not work. Btw, for that kinda speed you're gonna need 9.4-9.6:1 compression. It's been done before, and I'm sure Red91Bird will be by soon to explain it a bit further..

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'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
Misc Mods: Cut air box, '83 Firebird spoiler.
Performance Parts: MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers.
Audio Mods: Pioneer DEH-P3000, two 12" Optimus Pro Audio subs in hand-made enclosure each powered by a 260 watt Optimus amp. Working on shaving the box for weight.
My Homepage, with pics.

 

NO REPLACEMENT FOR DISPLACEMENT!!!!!!! 3.4!!!!!!!

 

There is noe replacement for displacement when talkign about making pure power. A 3.4 will make more power than a 3.1 that had the exact equipment bolted to it.

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

AND FROM ONE WHO HAS DONE THIS SWAP.
You'll have a million miles more fun just opening the hood & closing it after ya do a stock swap.
FROM MY ESTIMATE, GM 3.4 engine is rated at 160 HP & 195 FT LB of torque. By adding the MPFI inductions ystem, as is (running RIGHT!) you are adding about 20 HP to that figure.
In other words, you are closes to your mark, without tricks, as is.
Only thing I would add is 1.52 roller tip rockers (comp cam style). AND hop up ignition to full performance rebuild.
You'll have way to much fun to worry about adding anything except a new tranny rebuild.
My suggestion, only.
What's my ET?
Haven't a clue YET!

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

The 3.4L will make the more power cid for hp gained. I haven't built one of these 3.4L engines myself however they react the same as any airpump will. Running 9.5 to 1 comp is not a problem in them, you will need to get a aftermarket chip tho. I would recommend getting a set of good pistons and boring to .030 max. Get you're heads done over and pay attention to the intake and head part. These engines can be peaky and LOVE to breathe. GM has gotten a 4 valve 3.4L into the 275hp range, doing a 2 valve to 240hp is not out of the question. It will take proper spark and fuel control. I personally would shoot for 200hp and add a 75 shot. Anything over 200 is gravy and easy to do. Remember the fiero 2.8L racers get 275 hp as a common place.



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1974 Ford Maverick Grabber 302 - yeah its fast enough. Former owner of a 1991 Firebird - long live the firebird.

 

hmmm this might be a dumb question but , could I get 275 hp out of my 2.8 without nitrous ? Wayne ...yeah i know there are prabably some people laughing right now lol

 

get dished pistons, cr to 8/8.5:1, and add either a super or turbocharger around 15 psi

remember forced induction does not like high compression ratios

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85 Firebird. $150.00
2.8 Auto.
Blown Head Gasket.
Mods Galore to Come....

 

Yeah you can get 275 out of a N/A 2.8L... that siad however it will NEVER run on the street. Idle would be in the 1500 rpm mark, your stall would be in the 4000+ mark and the engine would wind up to around 7500rmp to get that HP. Torque would still be in the 250 ft/lb area. Would idle extermely choppy and you would be pulled over every other stop light... If i were you i would build a 190 to 225hp 2.8L with torque in the 200 to 240 ft/lb area and add a 75 shot...


David




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1974 Ford Maverick Grabber 302 - yeah its fast enough. Former owner of a 1991 Firebird - long live the firebird.