The Project Pad

Retarded fast highway cars are pretty popular in Florida. No matter which of those turbos he picks I think power will come on like a switch. I do commend him for spinning to 11k rpm. That's going to sound spectacular!

I'll play the angel on the other shoulder.

Have you every driven a 600cc sports bike? How come those things don't get crap for being relatively dead until 12,000 and rev to 17500? I tell you, if you drive one for an extended period, you just learn without thinking that you keep the revs right at 12,000 for optimal fun!

Same way with bigger turbos.

I have a relatively "laggy" turbo on my 2.6L with the 3582r. That "nothing, nothing, nothing" is still faster than chipped URQs, stock 20vt URQs, urS, or even a 225hp TT. I have done pulls in top gear with a taller 01e transmission than any of these cars, and they still can't pull me from 50-100 roll on at 2000 rpm in top gear. Why? It is still a very flow happy engine. Any positive pressure is appreciated. I may only make 3 psi at 2000 rpm, but is still more power(airflow) than a 20vt with a k26 at 10psi. But who drives like that regularly in a hot rod? Why not just shift up 3 gears to 3rd where you are at 5000 rpm and on boil?

Nobody loves lag, but I have never had anybody ride(not drive) in my car and complain about it being laggy. Just gotta learn how to drive the thing! I have had the comment of lag when people drive the car, but that is just because they don't have the experience to ride out the powerband.

Have you every driven a 600cc sports bike? How come those things don't get crap for being relatively dead until 12,000 and rev to 17500? I tell you, if you drive one for an extended period, you just learn without thinking that you keep the revs right at 12,000 for optimal fun!

** Is it advisable to bury the tach on a 600? Redline is fine, 3k in to red? no power there anyway.

cheers

R6's factory limiter is at 17500. I buried mine daily for a year and a half and a better part of 15000 miles. Loved it.



Power did drop off up there, but "no power up there" is a little bit of a stretch. Still far more than 10,000 rpm.

ShavedQuattro wrote:R6's factory limiter is at 17500. I buried mine daily for a year and a half and a better part of 15000 miles. Loved it.



Power did drop off up there, but "no power up there" is a little bit of a stretch. Still far more than 10,000 rpm.

ever watch stunters with those things, they live on the rev limiter. No issue. Revs are like crack when riding a 600.

Totally unrelated, but Yamaha has been overinflating their tach output for years. They spin about 1500rpm lower than what the tach reads. 16,000 rpm is still badass though.

http://www.superbikeplanet.com/2006/Feb/060214d1.htm

My ZX-6RR is quite gutless to 8000rpm. It's fast if you wind it out, but it draws a lot of attention. Some day I'll be looking to replace it with an Aprilia or Ducati 1L twin. I think one of those would suit my style better.

There are a number of reasons for doing what I'm doing. For one, the mechanical engineer in me really likes all the design that went into (and the shiny of) the parts that are needed to achieve the RPMs I want to shoot for. Two, high RPM sounds AWESOME. Three, I like to push the limit a bit and do something different from what most others do (why build another stroker?). Four, I already have an NA, very responsive car to drive and I like the contrast with the way power comes on in a heavily-turbocharged application.

Yes, I'd probably be very satisfied with 750-800 whp, but at this point, why not shoot for the stars? It doesn't cost any (much?) more money to make 1000 whp than it does to make 750 whp. You still kinda need (or at least want) things like bigger studs, mains + girdle, and more for both builds. The only thing that is going to happen is that the powerband is going to shift up... it isn't going to get narrower. In order for me to meet my RPM goals, the turbo has to be able to flow up top, so it has to be bigger. The result of that is a power-band in the higher RPMs, but NOT a narrower power band. Also, the power in the "NA" portion of my RPM range isn't so terrible (remember, I already tested the car out to 25 psi on the HX52). It is still responsive... sorta like a stock 7a. I imagine it will only get better with the CNC port job, slightly increased displacement, and mild compression reduction (from 9.3:1 to 9.0:1 in this case). Also, like Hank said, even at 5-15 psi, this thing is flowing a lot and is not exactly slow. When the power does come on, it comes on HARD which is very fun.

Transient response isn't so good obviously, but the goal isn't to build an ultra-responsive track car. I guess it is just to make the most power possible and be able to put it down on the street.

John, I've already tested the HX52 to spool to 25 psi by 5500 RPM. It is basically the same size as a 4202, so I would expect spool to be very similar. I think 6-6500 is a fair bet for a full 40 psi as I alluded to in my flow map thing on page 163.

mmmmm 40+psi

Yeah john, I had heard that on the yamaha. I guess my argument is that who cares what the tach says, just run it where it makes power.

I love the 636 I rode for a while. Super nice bike. I like revs so the 600cc bikes are awesome to me. I prefer them to liter or twin.