I feel fairly comfortable staying in the rev limiter, but not too sure about doing that with it being raised beyond oe spec. Any thoughts on this subject?

 

Don't forget the 1.5 way diff...

As for staying on the rev limiter, The motor does shake around quite a bit. This cant be good for it among other parts of the drivetrain. Still, many guys racing their S2ks have bounced on it for many years/seasons. I feel if you keep it within reason and listen to the Hondata and other guys in the know, it should be fin for auto-x use. I will let someone else be the guinea pig though

 

I too am a little worried about the higher than OE spec redline. I'm thinking of storing two programs in the flash pro. One with a 8500 redline and one with a 8800 or 9000 redline.

 

The AP2 can handle 8600rpm just fine for quite some time, you just have to remember that engine wear is exponential and you are shortening the life of your engine. AP2 piston speeds are the same as AP1 piston speeds, so going beyond AP1 piston speeds would be too much of a risk IMO. Banging off the rev limiter is no exception, the good thing about auto-x is that it is in such short intervals. Road race guys are seeing about 20k miles worth of racing before the engine gets tired. AP1 valve train is built to handle 10k rpms, but 10,001rpm is likely to grenade the engine lol. Really, the bigger the engine the lower the rpm necessary because you make power sooner. The downside to a lower rev limit with a larger engine is the lower mph per gear, but racing is all acceleration and weight so to me there is no replacement for displacement. But it can all be seen as preference.

As for the Hondata reflash it is/was designed to slap onto a stock car, and a reflash is probably not a bad idea for someone that wants a tiny extra bit of power and the couple hundred rpm makes that big of a difference to them. The problem with the reflash stuff is that even though the tune was based off lots of experience each car is unique and requires a completely different tuning style. Then when you add exhaust and whatever else a reflash is really just cash thrown in the garbage. A good example of this is a customer of mines '07 Civic Si, it has I/H/E, and a mugen headgasket. He bought the Hondata flash pro and none of the tunes make the car run good in the entire rpm range. The car sounds like a diesel idling with the A/C on. My advice is invest in a custom tune unless you have a stock car like I mentioned earlier. Just my .02

 

I would bet my money this is a very rare exception and the problem lies with another issue outside the reflash. I'm also searching and reading about many problems the 2.2L motor may have when continuously revved beyond the stock limiter. If I were to set a limit right now, I'm leaning towards somewhere <8600 as Hondata recommends elsewhere. We all should be somewhat cautious and use as much good information as possible. There are so many valuable threads on here.

Erik, I would like to hear more of your input on the aftermarket diff. According to Aaron, this may be a must have based on his before and after times on course...

 

Yes, I think a good clutch-type LSD will prove to be a significant improvement for those serious about STR. Simply stated, you will be able to pick up the throttle sooner and more aggressively than what is possible with the factory torsen.

 

the only thing that scares me about buying the LSD is in case the rules change after the provisional year.......it does sound like a great mod though.....

 

Prices on the OS Giken LSD are going up after Jan 1st. I ordered one this week for my wife's Xmas present.

I think they are going up 10% IIRC

 

What if she wanted an 06+ instead?

 

She wants a blue CR. but she is going to have to wait a while for that...