my poor y7 AUTO changes gears at around 5200-5500-. so if i switch them myself by manually moving the auto stik i can hold off till 6800? is that right? and yes im trying to find a y8 tanny cause the y7 is such a dogger. thx

 

Shaving weight off the valvetrain and getting a lightened flywheel will help you gain RPMs... but there is no reason to get higher in RPMs unless you tune your engine for it.

 

also the d's have a longer stroke than a b series, so revving them high will cause a lot more premature cylinder wall wear do to excessive piston speeds

RPM stands for ruins peoples motors

 

that's actually kind of interesting... the fact that the engine makes peak power above your so-called drop-off of 6800. Peak power comes at 69 and change.

 

ok heres the deal guys. HP and TQ not only depends on the parts, compression, displacement...etc...but also on a number of factors that you cant control, such as temp, humidity, air pressure, gas quality, age...a billion things you cant control. there are thousands of different numbers out there on HP and TQ and their RPM's, one person says 6500 for hp, one says 6900+change...bottom line is there is no set number. it, like actual numbers, also depend on a billion other things. 6800/5500 is about average. so stop the bull**** arguing about where it 'really' is. its like arguing over 'how much hp will i make on 6psi'...theres just no way to really tell because there are a billion and one other factors that need more info provided to get a better idea.

 

The bottom end of a Y8 is not made to rev that high. I am not going to write a long drawn out post about it but it simply aint. If you have the un-dieing need to rev that high for whatever reason you need a couple things to do it safely. 1 like mentioned is a cam, something agressive enough to give you that power but say goodbuy to what little low end power you had before. Also a set of valve springs, retainers, little bit larger valves, head porting and polishing. your looking at around $800 to $1000 in the head alone. Then you need to addresse the bottom end. First and formost a set of arp rod bolts are needed, you may be able to get away with just rod bolts but if you dont enjoy putting your engine together only to have to pull it back apart in the near future I would buy a couple other things. A set of lighter yet stronger rods like some crower all motor rods that are not forged(at the power levels you will actually get with this you dont need forged). What this leaves you with is about 80% of a all motor setup, you might as well go ahead and slap some 11 to 1 compression pistons in it, a nice set of ITB's, convert to obd1, run Hondata or EMS, and tune the **** out of it on 93 octane.

But in the end all this is not worth it unless you are just doing it with no power levels in mind, you could maybe see 160ish whp out of it but it will not be daily driver freindly at all, get crappy milage, and be a pain in the *** to maintain.

 

That is precisely why there is such a thing as a 'standard.' If you want I can go back and edit my post to say "under standard conditions," but I assumed that part was implied given those numbers are the factory rates.

Besides, saying "tq drops off on all Ds at 5500 and HP at 6800" is the stupidest thing I've ever read on this site. Some Ds peak torque as low as 3000rpm. If your statement were correct, they'rd be no reason to spend $200 on Z6 head, or $1000 on a jdm d15b swap, because they're all the same right? Preformance costs money, and the only way to know what you're buying is with sets of standards.

 

how is an engine the exact same if it makes power at the same RPM? you're saying that an old civic that makes peak power of 85hp at 6000rpm and a vette that makes 400hp at 6000rpm is the exact same engine? that makes no ****ing sense at all.

anyway...making power at a specific RPM doesnt determine performance. its the entire powerband that determines performance, along with the quality of the engine itself.

 

"tq drops off on all Ds at 5500 and HP at 6800"

Hence my saying, "they're all the same right?" As in, "since all D series are the same, right?"

 

Look you guys be good, you are taking this way off topic of what was asked from the get go.