Muzz

Folks,

Can anyone who drives an Australian Delivered 350Z confirm if they are speed limited (to 180kmh) and at what rpm the rev limiter cuts in in higher gears like 4th.

Thanks

zuffy

last time i hit the rev limiter it was around 6600rpm...

although i have changed gear when the light indicator flashed, and mine is set to 6600 so it might be a tad higher.

Muzz

Zuffy, I am not refering to the tacho light but at what revs the engine management system kicks in and shuts down the supply of fuel. Rev limiting occurs regardless of where you set the tacho light and is probably set in the ECU. You know when this is happening because the engine loses power and behaves like it is running out of fuel. For Track models this is with VDC turned OFF otherwise you can get a similar situation of the engine being starved of fuel during hard gearchanges even if the revs are well under 6,000 rpm.

On the racetrack about 100m before a major breaking point, a glance at the taco shows the egine revving through 6,200 rpm in 4th gear (180 kmh). I figured I would be okay to rev to 7,000 to avoid a change into 5th for only 100m before changing back to 2nd for slow corner. I suspected this to be speed limiting because my previous japanese import was speed limited to 180km/h. The speed of 180km/h could be coincidental with the rev limiter reaching its limit. Next time out on the track I will change up to 5th to see if I can pass the 180km/h speed.

However perhaps some of the rest of you folks can confirm your experiences in relation to rev limiting even in 2nd or 3rd gear.

apsilon

The rev limiter is 6600 I believe. We don't have a speed limiter like the JDM cars AFAIK. Mine was up to ~215kph in 5th on the dyno.

Muzz

Thanks Apsilon. I was reading the thread about Technosquare ECU which sounds very interesting. They vary the Rev Limiter to 7,100 which would be ideal for me, however I am not sure if all the other settings they make for USA fuel etc would be optimum for AUS. The comments on Technosquare say that it is optimised for the mods on the car and no changes by the ECU over time occur to negate mods like an exhaust.

Any one have any information on this?

SoCalKid86

hey guys, I'm from the US and I just got my Technosquare ECU flash done. I'll tell you, its ****ing fabulous. The rev limiter is set at 7100 (still with the fuel cut) and also the throttle is now able to open at 100%, previously it wasnt only opening to about 80, and also the speed limiter is removed. The A/F is improved, the engine pulls hard all the way to the new redline, altho its 500 RPM up, 7100 feels like a lot more than 6600. You guys should get it done. We have shitty gas here..whats the octane rating there? I'm sure the ECU will like the better gas.

harryw

We have 98RON readily available (in most major places anyway). In fact OZ specs are tuned to run "only" on 98. I for one havent tried any lower grade fuel so Im not sure what would happen if I did.

The problem with the Technosquare ECU, AFAIK, is that you have to send them your ECU?

If that is true it poses a bit of a problem, unless of course you can do without your Z for a while.

I think I have decided to wait before I do any mods (including exhaust) until either someone here does a decent flash or I can get one I can upload myself. Either way Im not going to be a guinea pig so it will have to be proven.

H

apsilon

Keep in mind we measure octane differently. Our 98 is equal to 93 in the US I believe. I've run on our 95 and could detect any difference.

You're correct Harry in that you have to send them your ECU. Would take at least a week to turn around and you run the risk of loss or damage in transit as well as potential customs problems. The benefits aren't there IMO. Yes the rev limit increase would be nice but the speed limit (if there is one) is far above any speed you're ever likely to see and the power increase is marginal.

If they'd sold it at a better price I may have considered it out of curiosity but instead I'll wait and see. You can be certain other options will come out of Japan.

REDZED

Just curious about the 80% throttle opening - can't remember where, but I read about a sequence to "reset" the throttle after removal or some such. Does anyone know wether this is true.
If all our throttles are only 80% open then it seems like theres EASY power to be had......

zuff

yeh, i've read that throttle opens to around 80% when you mash the pedal.

From what i read reseting the ecm doesn't change that.

I wonder if James from Perfect Power has fixed that with the smt6 and that is where he gains the power from?

apsilon

Doubtful. I don't see how the SMT could control the throttle. The TS ECU apparently does open the throttle further as well as raise the redline, and change the fuel and ignition mapping and still only got, what, 7rwhp? The gains being claimed from the SMT haven't been shown on a stock car yet so are unproven IMO. I hope I'm proven wrong.

zuff

"I hope I'm proven wrong."

So do I mate, so do I! It would be great to get another 20kw from an optimised map.

ZZZ-35

You are all forgetting the fact that the US cars have 8kW (214kW) more to start with and the only difference is the ECU so adding the re-flashed TS settings plus mappings should gain us around 11rwkw. That IMO is not to shabby plus 7100rpm redline 100% throttle opening.

David

apsilon

True but we also don't have their quality of fuel so it's possible you'll experience detonation even on our 98 if the TS maps are agressive enough which I believe they'd have to be in order to get the gains in the first place.

nizmo pete

To check if you are getting full throttle, remove the intake pipe from the air flow meter & the throttle body and then select 1st gear. Now turn on the ignition but dont start the motor and have someone fully depress the accelerator. My bet is you will all see the butterfly open 100%.
It just does not make sense to only open it 80%
My car opens 100%.

malcolm

I also believe that we will pick up at least 11kw by installing the TS ECU. The TS ECU has been set for 91 octane fuel as is available in California. Our 98 RON is 91.5 octane, so we should be OK. I wanted to buy a TS upgrade, but am waiting to see what happens with the SMT6.

zuff

I looked up some info on RON to PON conversion.

Here is the equation to use

PON =(RON+MON)/2

Here the RON and MON data from BP...I presume Mobil is the same with it's 98oct fuel

RON MON
old Leaded Super 86 86.
Lead Replacement Petrol 96 85
Premium Unleaded 96 85
Regular Unleaded 91 82
BP Ultimate 98 86

source http://www.fefcholden.org.au/techinf...ls_PET2002.doc


So our 98 oct should be 92 PON