I was wondering what type of HP / TQ is capable on stock evo IX.

Coming from Modding Honda's you had to build up the block in order to get get all the necessary power from turbos. Just got into Evo. Trying to get some idea what Evos are capable. Appreciate the feedback.

 

i put down 511hp 420tq stock motor stock tranny n tcase got built motor now

 

with a good tune 500whp is possible on the stock block, tranny, etc..... generally the question is for how long will it last. Some last 10k miles, others seem to be running forever. In general its going to come down to how you drive, how well you maintain, and how often you beat on it. The more power you make the more wear your putting on your powertrain.

The block is closed deck and will hold alot of power, easily 500+hp, the first thing to go is usually rods, sometimes the pistons better to upgrade first because if the rod goes it usually makes a hole on the way out. Unless your planning on building a stroker building the engine is added insurance against failures.

The gears used in most 'built' transmission are the same as the stock 5spd gears. They can hold alot of power 500+ easily, but evo transmission tend to get beat on a bit, the 6spd has been shown to get weak around 400+ft/lb tq usually rounding off 4th gear.

 

so in that case, what is a 'built' transmission actually buying you?

 

I've read on here many times to not go over 400 "TQ" on a stock block. It's the torque that you need to be concentrating on, not horsepower.

 

WHP never break anything, Torque will F some stuff up though!

 

depends on who is building it but in most cases the case bolts are upgraded to help prevent flex, everything is shimmed to factory specs, the synchros, hubs and sleeves are all replaced with new parts and in some cases upgraded, cryo treated, or polished.

The synchros hubs and sleeves are the primary wear items on the transmission unless your grinding gears alot in which case they can wear also of course.

Here is what shepard transmissions websites lists as included features for their street/strip build....notice nothing is mentioned about the actual gears, however if yours are damaged they can of course replace them with new ones, most of the time they are still factory although some aftermarket gears are available I'm sure.

New 1st gear synchro
New 1-2 shifting sleeve
New 2nd gear synchro
New 3rd gear synchro
New 3-4 shifting sleeve
New 4th gear synchro
New 5th gear synchro
New 5-R shifting sleeve
New Reverse Synchro
New input shaft seal
New shaft end seals
New axle seal
New 3-4 fork
New input shaft bearings
New high strength roll pins
New 1,2,3,4,5,R synchro springs
Neodymium magnet
Bead blast
New thrust plates
New thrust plate retainer
New Oil guides
Shims

 

I have read the same as above. Stay right at or under 400 wheel tq and you should be good. Consider this, when your thinking of your power levels, turbo choices etc. Bigger turbos make power, with the tq coming on later, help the stock block. Most of the factory frame turbos are torque monsters, so those are the ones you have to be easy with imo.

As for the trans, imo, i think its all how you drive. If you like to launch, bang the gears, your gonna need a built trans quicker than I will. I do a lot of rolling pulls. Not too many launches and just ripping through the gears. So the trans, is all about how you drive.