Well I finally am letting my self off the break in period since im at about 1000 miles. Anywhooooooo, I pushed my car a couple times last night and am unsure of the 0-60 and the associated shifts.

From what I could judge pushing it in second through the powerange takes it to aroudn 55, requiring a third shift.

Am I going crazy? I thought it was 1-2 shift to nail 60? Or should I just be pushing it a bit more .. I hit around 6100 and shifted (no power outside of it).

 

If I had an FCD in my T2 I would be able to hit 60 in 2nd gear, but I have to shift at 5500 to prevent fuel cut.

 

5500 rpm fuel cut ?
wha t happen to 7k redline

 

I have a larger than stock exhaust with no cats, so the reduced backpressure allows the turbo to boost more. The ECU cuts fuel to the rear rotor at roughly 8.6 psi. There have been a few times where I have seen more boost (9-10 psi on subzero nights) without hitting a fuel cut, but for the most part I have to shift sooner to keep out of the high boost.

The reason I don't currently run an FCD is because I am not going to waste 50-100 bucks on one when I am going to get a Rtek 2.0 upgrade as soon as I have the extra $400.

 

You should be at 60 by the top of second.

 

'89 TII running 11 lbs-I can't make 60 in second as peak power drops before 60.
With 25" tires you'll need to hit 6700, which is a little high for my TII, at least to keep in the power band.

 

Is'nt fuel cut determined from Boost pressure? (s4 t2's @6-7lbs) s5 t2's @ 8-9lbs?)

I'm microteched/rebuilt/streetported/3'' turbo-back and I hit 60 as soon as I look down after shifting to third so.

later,
-Dustin

 

i have 3 inch exhaust with no cats. with a FCD. 1st gear i usualy rev to 7,500 since its so
f-ing short. still only does 6-7 psi. IN second gear i do 7,000 rpms doing 60 mph but still only hitting 7 psi. IN 3rd and forth thought it will creep to 9psi dropping to 7psi by redline.

no boost controller. boost should have nothing to do with hitting 60mph in second gear. All t2's should do it.

 

This:

Yes. I believe the magic number is 8.6 if memory serves me correctly.

Enzo, Mazda decided that to keep from over-boosting the motor, they would cut fuel to the rear rotor above a certain boost level. That's bad. So, you get an FCD (fuel cut defender) to avoid that.

Until, of course, you end up with so much power/boost/whatever that you go to an aftermarket EMS.

 

i shold have posed my question better. i know its possbile .. but is it worth it to really run the gear out outside of the powerband ... or is the tradeoff between running outside of the powerband and the time it takes to power shift third greater?

basically is it quicker to run the gear out ofr just shift

 

You need to play around and see what works best. It might be better to shift a little sooner than you are, just to stay in the best part of the power band.

 

Unless you've messed with the gearing (diff ratio or overall tire diameter), the 7000rpm redline gets you exactly 60mph in 2nd gear.

No, it's not. Overboosting is potentially a lot more damaging.

 

Here's an easy way of determining the MPH/RPM using the trans gear ratio, diff ratio, and tire size:

http://www.bgsoflex.com/rpmmph.html

 

WHat do you mean? Look man your turboII has powerband at 6,200-6,500 rpms and should have plenty of power by 7,000. And if you think it doesnt and you shift shorter than 7,000 on a rotary engine than you should just quit trying to race. or atleast racing rotaries.

BUt i could understand IF it is your first turbo vehicle. Since everyone knows when the boost kicks in it feels hella fast but when boost settle it feels like its not doing as much.. but guess what! your still pulling hard man!!! Learn to drive. My opinion... Go to a track and shift at 6,500 like you say all the way down the track. Than do it again like i do it. First gear 7,500(depends on your launching style) rest of gears at 7,000 flat.

 

i think the time you save by shifting only once isnt better than that little bit of power (also less chance of missing a shift)

someone should try it at the drag strip

 

my first turbo car .. well its not. but that wouldn't matter. Anyway I know the whole turbo and its range of efficiency as well as where the power drop off is. and discussing with a lot of people on a turbo 2 drop off is a bit before 7000.

I'll check it out at the track once i get my car up and running

 

If you shift as soon as power drops you will end up lower in the powerband then if you shift higher. I would sugest shifting higher because their is still substancial power after 6100 rpm and you will end up higher into the powerband.