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View Full Version : 3400 sfi max HP?



bobgagt1.0
07-05-2009, 12:52 PM
I was wondering... what is the max HP that has been coaxed out of a 3400sfi? I'm interested in both street legal and race HP

robertisaar
07-05-2009, 01:06 PM
people push them to 300 crank HP all the time with no problem...

19Cutlass94
07-05-2009, 01:28 PM
8000hp

Superdave
07-05-2009, 01:29 PM
depends on the setup, but i've seen 400+ out of a boosted 3400. I'd imagine with some upgraded internals 600-800 wouldn't be a problem. You'll likely run into transmission problems before engine problems.

robertisaar
07-05-2009, 02:10 PM
8000hp

i forgot we were dealing with top fuel engines :lol:

and X2 for superdave, tranny will likely give out before the engine does...

19Cutlass94
07-05-2009, 02:11 PM
:lol:

Youll end up spending almost as much on the transmission to hold the power, as you will making it.

Superdave
07-05-2009, 02:17 PM
you could probably build a 700R4 to take the power.. for a FWD app the HM284 should handle 400-600 depending on the torque, RPM range and driving style.

bobgagt1.0
07-05-2009, 02:17 PM
depends on the setup, but i've seen 400+ out of a boosted 3400. I'd imagine with some upgraded internals 600-800 wouldn't be a problem. You'll likely run into transmission problems before engine problems.

definitely would have tranny issues before I got the engine to 600-800 hp.
I 'm just wondering what would be involved in getting the 3400sfi in my GA up to it's maximum street legal potential. this has been difficult to find out since it seems like no one has really tried to do this. so to get it up that high I would need to rebuilt the whole engine right? rods, pistons, ported/polished heads/ uim/lim, TB,... anything I'm missing?

I'm thinking that once I find the cash I would rebuild a 3400sfi and a 5 speed to install in my 2000 GA if the final HP would turn heads and make people say "he got how much HP out of THAT motor?!?"

robertisaar
07-05-2009, 02:48 PM
i think if you're looking to push 600-800HP out of a grand am, you might as well have a tube frame made for it, and hook a T56 or TR6060 up to it.... a lot less likely to blow the tranny to hell that way...

TiredGXP
07-05-2009, 03:21 PM
I 'm just wondering what would be involved in getting the 3400sfi in my GA up to it's maximum street legal potential. this has been difficult to find out since it seems like no one has really tried to do this. so to get it up that high I would need to rebuilt the whole engine right? rods, pistons, ported/polished heads/ uim/lim, TB,... anything I'm missing?

Cam and forced induction?;)

:cheers:

Superdave
07-05-2009, 03:23 PM
definitely would have tranny issues before I got the engine to 600-800 hp.
I 'm just wondering what would be involved in getting the 3400sfi in my GA up to it's maximum street legal potential. this has been difficult to find out since it seems like no one has really tried to do this. so to get it up that high I would need to rebuilt the whole engine right? rods, pistons, ported/polished heads/ uim/lim, TB,... anything I'm missing?

I'm thinking that once I find the cash I would rebuild a 3400sfi and a 5 speed to install in my 2000 GA if the final HP would turn heads and make people say "he got how much HP out of THAT motor?!?"

your trans won't hold up so yah.. you'll need to put in a 5 speed or sink alot into the current auto. the HM282 is fairly common and will hold 400 HP easy. They are found in early 90's/late 80's V6 Cavaliers and Berettas.

Since you are talking about swapping engines anyways.. I'd start off with a 3500 from a '04-06 malibu (or a few other cars). then boost or build that ;)

01GPGT
07-05-2009, 03:48 PM
8000hp

over 9000!!!!

http://ui02.gamespot.com/801/67dea81e47c405c4af05e44d7b736cb2_2.gif


sorry had to:D

bobgagt1.0
07-05-2009, 05:37 PM
over 9000!!!!

http://ui02.gamespot.com/801/67dea81e47c405c4af05e44d7b736cb2_2.gif


sorry had to:D


LOL .... okay, come on now, i'm being serious

geoffinbc
07-05-2009, 06:29 PM
Asking that question is like asking how much power a small block will make and still be street legal/drivable. It is really up to your budget, skill and imagination.

How much money do you have? Because if you say you want to make 400 horsepower on $2000 well thats not going to happen because that will hardly cover a rebuild. You say you have $10,000 to burn well now were talking and really you can make as much power as your willing to risk. And by that I mean the block, no one really knows what the engine can take since no one has ever been able to break one. Now that 3500 forged cranks are out I don't think the crank is a concern like the old cast ones were. And even they have never been broken.

In the popular world of small blocks everyone knows the limit. Up to 400hp and stock 2 bolt mains are fine. More than that and you want factory 4 bolts mains. Start creeping up on 600hp and billet main caps become necessary and so does a bow tie block. What can you do with a 660? Well who really knows. So if you want to be safe and actually build something you can drive then stay around the same power that other have proven to be reliable. If you want to get fancy and have the cash to do it than be our guest. I am sure all of use are dying to know what could be!

Mars
07-06-2009, 01:59 AM
Dumb online HP calculator for my car :


Your Crapalier weighs about 2900 pounds and can run the 1/4 mile in about 12.10 seconds. This computes to about 323.54 HP at the wheels, and about 420.60 HP at the flywheel.

That kind of power (400 or so) can be had on a 3400 ALL DAY LONG. I beat the hell out of my car and besides trannies, it always comes back for more. Stock crank, rods, pistons, ect. Only mod I have is a cam, GM graphite head gaskets and LS6 springs. rest of the motor = stock.

I would say on a good tune, you could get a 3400 to 500 crank HP and be reliable.

Trans is easy though, look at the L67 4T65E-HD or whatever it is, they can be built to handle some power.

H282's well, I have had some issues with them and only get about 1.5 seasons out of them. (Hard drag racing use, and I drive it like an arsehole) I am just putting in trans #5 now...

But the V6's are damn strong IMHO.

01GPGT
07-06-2009, 02:07 AM
Trans is easy though, look at the L67 4T65E-HD or whatever it is, they can be built to handle some power.



that is debatable almost every one with a GP says other wise;)

Superdave
07-06-2009, 10:18 AM
I'm helping a local guy with his 3400/3500 hybrid/turbo build.. I'm guessing it'll be right around 500 @ the crank. That'll be pretty nice in a Beretta. :)

bobgagt1.0
07-09-2009, 06:40 PM
I'm helping a local guy with his 3400/3500 hybrid/turbo build.. I'm guessing it'll be right around 500 @ the crank. That'll be pretty nice in a Beretta. :)

I'd love to hear how this turns out. please keep us informed.

any concerns about cracking the block? I know the old 3.1 has had issues with that and the 3400sfi was essentially built from those design specs, were the block issues dealt with or were these "fatal flaws" left for us to deal with?

robertisaar
07-09-2009, 07:04 PM
i don't know where you heard this from, but these blocks were built right, it takes a lot of bad luck/parts to get a block to crack, unless you're the dumbass that leaves straight water in the radiator over the winter, then yes you'll have block cracking issues.