What is the max RPM (redline) of the 3.1 liter engine?

Fieros (at least my 85SE v-6) have rev limiters controlled by the ECM. At a set point RPM (6000 on my car) the ignition cuts out. This has saved me on a couple of accasions when I lost traction blasting into a corner that had sand on the pavement. The 2.8L is relatively short stroke and revs quickly.

If you mean what is the max rpm the 3.1L can safely handle I'd have to guess around 7000 or so. You can probably run it higher but you'd shorten the engine's life. Also this would depend on the age of the engine.

About 6 grand with hydraulic lifters and stock valve springs is about all I'd do.

The practical limit is 7000 without some serious valve train work.

there is no gain in the upper rpm ranges so there really is no neeed to rev it past 6000 i've taken the limit program out of my car and peged it out above 7400 accidentaly on the dyno with no broken parts... (stock 2.8)

How much power is made above 6,000 rpm's? Is it worth turning the engine the engine up that high if peak torque and HP is made lower? I am wondering because the v6 in my 88 doesnt "like" to rev past 4500 under load.

1FST probably means no gain with a stock engine which is true. But, go with a longer duration/higher lift cam, headers, head porting, etc. and now it does pay to get into the upper RPM range because there is more power since the HP curve has shifted.

Terry is right about not being able to tap into this high RPM (reliably) unless you spend big bucks on the valve train: light weight valves, heavy duty dual springs, roller or solid cam and lifters, roller rockers, screw-in rocker studs, etc.

Cooter, if you still have the tired old stock ignition, they don't seem to like high RPM. You might need a new high output coil and new plug wires. Weak valve springs will greatly limit the amount it will rev too. Actually, lots of things could hamper performance.

I was just wondering if the longer crank throw put more stress on the bottom end and therefore limited the high RPM potential. If a 2.8 can achieve 7000 RPM without braking than would a 3.1 do the same.

What is the red line for a 3.4-liter engine like the crate engine from GM performance parts? In their catalog they show a graph that only goes up to 5000 RPM. This may be because the 3.4 engine does not produce any power above 5000 RPM or it can’t safely rev that high because of the longer crank throw.

yes the added weight is exponentialy more painful to the bottom end. BUT! if it's balanced correctly and built withing the factory or more stringent specs you'll be fine... solid lifters would help A LOT!

I wouldn't worry too much about trying to get more rpm out of a V-6. They are naturally unbalanced. They can have a lot of lower rpm power but just are not made to rev endlessly. My Fiero is pretty smooth, even up to 5000, but it does have strong motor mounts and a top mount/dog bone holding it down.

Build for more power in the exsisting rpm range. Not for more rpm. Also, when you move the rpm range up, you loose bottom end power, important when trying to move a 2700 pound car (we weigh a lot more than the MR-2 with the same horse power).