Hi guys,

Had my 1993 300ZX TT Automatic on the rolling road today and the Dyno operator could not get a good figure out of the session as the auto box would change up before peak power was reached.

How is the Zed auto successfully dyno'd, any info would be much appreciated.

Thanks - Andy

 

 

You need a new dyno operator

17 minutes ago, jimmer said:

You need a new dyno operator

This!

Rather than an new dyno operator, I think that he just needs enlightened on how to dyno a 300zx with an old "slush" box.

He's mainly used to having Scoobys on the rollers and is quite competent - so some practical advice would be nice.........please.

 

From memory is there not a hold button to stop it changing up so soon.

Not on a UK spec, there isn't!

 

You need to remove the automatic transmission, replace with a manual transmission and try again. ?

Comedians, the lot of you ?

On 20/08/2021 at 17:59, CrashCourse said:

Comedians, the lot of you ?

LOL - sorry fella, sometimes the banter gets the better of us!

Seriously though, there has to be a way. I mean, plenty of new performance cars get dyno'd and pretty much all modern fast cars are autos. Can it not be done with the 'box set to either "1" or "2" or with the OD switched off - to stop it changing up any further?

Not that I'm an expert, it was a suggestion - maybe Jimmer can answer that.

From memory, you take overdrive off , select drive and increase engine speed slowly until the car is in top gear, then you floor it and commence your readings from that point. It is more difficult for the dyno operator to get accuate readings both on torque and BHP but very doable. 

 

Cheers

 

 

Some information on what needs to be done here:

http://www.twinturbo.net/nissan/300zx/forums/general/view/1713620/You-need-to-lock-your-auto-tranny-in-3rd-gear-to-get-a.html

http://www.twinturbo.net/nissan/300zx/forums/technical/view/1044203/Re-Automatic-Transmission-Dyno-Trick-Which-2-colored-wires.html

https://ess-racing.com/

How much more power would the auto sap compared to a manual?

Mine on rundown was sucking Circa 80 BHP extra up and above typical Manual box loss,

 

 

Thanks for the replies, I've now found a new "Dyno guy" who knows his way about Zeds, Skylines, Stageas.....etc.

His first recommendation was for me me have a Nistune board fitted, that will enable more accurate mapping to optimise the power of the rebuilt engine.

I've also had a word with Horsham Developments, re the fitting of said Nistune board and hope to have that done in the next few weeks.

I'm not looking for silly power, just a safe, efficient map that has to be better than the generic chip that is installed at the moment.