Hi, i have been searching through previous posts but couldnt see a full answer for this (although I apologies if this is because of my ignorance).

 

I seem to be hitting a "wall" when accelarting through the gears. I am still getting used to the car's full capabilities and have taken my time in easing it in (since having a recoditioned engine put in). I have done all the recommended mileage about 4000 miles of it with the upmost care and have spent another thousand opening it up slowly. 1 for the fear of damaging it and 2 for the fact that it has an awful lot of power anyway.

 

But now I am trying to gauge it's full capabilities it stops at 3rd gear - 6200rpm and 4th 5500rpm. In second I have only gone upto about 7000rpm, and obviously 5th is a bit hard to examine.

 

(The car is a 1990, manual, Non turbo)

 

I have read previous bits on speed limiters but they dont seem to link in.

 

Is this just a case of getting it Dyno'd and having the engine remapped out???

 

If so does anyone have any recommandations of somewhere in the region of Brighton where I could get this done, as not being able to drop down gears is proving very frustrating! :headvswal

 

Your help is appreicated

what speed are you doing at these revs? i'm thinking that maybe the limiter hasn't been removed. top spped with limiter is 112mph IIRC.

 

good choice on the car too mate. i have a 1990 manual N/A :D

i have a 1990 N/A and had exactly the same symptoms. I found that the previous owner had disconnected the speed sensor into the ECU either by accident or on purpose. I hooked it back up through a Greedy Speed Limiter controler and no more cut out at 5500 rpm's. Remove the plywood in the footwell to expose the ECU and look for a pink wire running into the right lower connector to make sure it's secure.

If you look here http://www.geocities.com/z_design_studio/transmission_300zx_tt.html it seems he's not getting to that speed. Has it got the OEM speed limiter or some form of electronic converter to change from kph to mph?

If you look here http://www.geocities.com/z_design_studio/transmission_300zx_tt.html it seems he's not getting to that speed. Has it got the OEM speed limiter or some form of electronic converter to change from kph to mph?

 

 

I had a converter put in so it reads MPH, does this mean the problem is likely to just be the speed limmiter? If so do i just need to get it remapped or taken off?

 

I would say im not going anywhere near 112mph more like 80 - 90 ish (on the private road I use) will have to take it out and check.

If the problem started after the "converter" was put in, then remove it and see if you get the same problem. There are good and bad converters and also good and bad installers. If you check the wiring diag (on line manual here http://www.300zx.co.uk/cgi-bin/manual.cgi ) you can see that the ECU and speedometer are connected to many sensors (eg ECU, power steering, HICAS, gearbox just to name some). Despite a lot of research, I have yet to find ANY one offering to fit a converter who could fully explain how it did its job properly on a Zed. Like most things with this car, it's far from simple.

I had a converter put in so it reads MPH, does this mean the problem is likely to just be the speed limmiter?

normally the converter removes the limiter (i think) so i think you have a different problem