twospoons_

Doh, the lock out is in software??? Ohwell, then writing or getting a tool to do a brute force crack should be pretty easy to do.

If we are correct that the password is 5 characters long and does not include numbers and / or special characters then it will take and average of 9 days to brute force crack it with the 9600 baud com port running at full boost (240 tries a second).

Kooldino

Not sure you'd gain much at such a low PSI.

Dunno what setup Jeff is running, but I'd guess around 240whp for Jon.

twospoons_

If Jon is running at 7psi we should see an increase of 61.6% torque and 48.6% hps (if the aussies weren't lying).

That ammounts to 263 hps and 209 torque for Jons car based on his previous dyno results.

The sad part is that it looks like we are having 25.6% drive chain loss.
I wonder if RB could post their dyno stats since the have an engine dyno. Curious to see if we really have 238 hps.

bureau13

You can't calculate horsepower based on pressure like that. Too many other factors....as has been said many times, if you take two turbos of different sizes and run 'em both at 7 psi, the larger turbo will make more power, all other things being equal. Its all about the number of air molecules that go in, pressure is just one element of that equation.

jds

twospoons_

If the temp of the air and the size of the tubes are the same why would a larger turbo producing the same PSI make more power than a smaller turbo?

ctupton

it is able to flow more air at 7psi than a small one, right?

RXhusker

If we get numbers like 189 hp -- I guess all the threads will again speculate on if the 8 can be accurately dyno'd again Let's hope that's not the case.

RXhusker

It will also be interesting to see how Greddy's map hold up against Jeff's custom tuning.

twospoons_

I might be totally off here but I'll give my 2 cents.
IF you have 1" tube you plug one end up and plug the other one into something which can pressurize the air inside the tube.

You get the pressure inside the tube to 7 psi. You open the closed end and let the pressure out. The amount air (molecules, if the temp. is the same) being let out is exactly the same regardless oh how you got the pressure to 7 psi. If I used a hand pump and got to 7 psi, or if I used a gigantic turbo charger the pressure inside the tube is still 7 psi. Granted a large turbo can generate that pressure faster and higher, that’s why you use a larger turbo, but it also requires more exhaust to spool up.

Assuming you attached that tube to your intake and you keep the pressure gauge still on. If I can pump fast enough with my hand I can still generate 7 psi (which is what the Greddy turbo does). If I keep the tubing size exactly the same and just put on a bigger turbo and keep the pressure at 7 psi how in the WORLD can more air molecules get inside my intake? Pressure is a function of how many air molecules you have crammed inside a certain space at a certain temperature.

ctupton

True... hmm... then I dunno?

bureau13

Big if though...the larger turbo will be more efficient generally (somebody yell at me if I'm getting this wrong) and so the temperature won't be the same.

jds

Kooldino

True, but I've also heard that it takes the same amount of air to create the same amount of psi on a given motor. Assuming both turbos are equally efficient, then turbos A and B both making 7psi on a given motor will be pushing the same amount of air to do so, and thus make the same amount of HP.

Not sure which was is the correct way, but it's food for thought.

Broke_Apex_Seal

In this case running 7,8,9,10 psi should make the same level of power but jeff can run more boost BECAUSE of the bigger turbo. 7 psi on tdo6 and 7psi on a t78 should(will) be the same. Now jeff has his own maps he can lean his out, as philodox is stuck with a preset map from greddy. So Jeff I think will make more power if he got enough time on the dyno.

Kooldino

That's a reasonable and true point in some cases, BUT, you really need compressor maps to get specific.

At 7psi, I'd wager that neither of the turbos in question are out of their efficiency ranges.

If we were talking abot 17psi, it'd be a different story.

Kooldino

QFT

bureau13

Good point, I hadn't considered that at low boost, the efficiency differences would be negligible. That's probably true. Hmmm, so unless you're planning on upping the boost by quite a bit over the stock GReddy settings (and incuring the greater risk to your motor by doing so) the complaints about the GReddy turbo in the kit being a bit on the small side are probably irrelevant.

jds

twospoons_

I would also assume that when you increase the pressure a bigger turbo is more likely to be able to sustain the desired pressure without to much fluctuation.

slavearm

Engine Dyno shows 207-212 for the 13B-MSP courtesy of my visit to the Racing Beat Facility.

twospoons_

Thanks! Now it all makes sense! If you average for 210hps then the Greddy kit gives us roughly 102hps more. 15.7% drive chain loss is much better

So my guestimate are: 312hps crank, 263hps wheels.

truemagellen

hey not bad at all especially considering the price

I'll still wait for the dynos b4 I get excited but your analysis is interesting

twospoons_

It's just a maths based upon the numbers the aussies claimed for their 7.5psi turbo. If their numbers were bs, then this math is bs.

dmp

Most ppl are estimating 230-240hp at the wheels. 100hp from 7 pounds boost on a 1.3L engine? I'd say 50-60 would be lucky.

twospoons_

Well, the ppl down under claimed 362hps with 7.5psi.. Theoretically 14.7psi should give you a 100% increase in hps, so it's not completely unreasonable...

Edit, they calculated based upon 238 hps crank, which is incorrect. Their numbers should be 319.2hps and not 362.

dmp

I still don't buy 100hp from 7psi on a 1.3L. I probably can't argue 'why', but that's where I stand. IMO, mid 200s at the wheels is the most one can expect.

fwiw, on my last car - 2.5L Mazda V6, my car went from ~160whp to ~250 whp on 8psi - similar sized turbo as the GReddy RX8 kit uses, IIRC.


Side note: Quoting 'crank' HP is a bad habbit, imo...it's impossible to measure, and in reality, doesn't mean squat.
:D

lol :D

NAVILESRX8

iTrader: (1)

why do people always insist on comparing piston engine displacement with rotary engine displacement?

It doesn't quite work that way.