Hi all just got my first 300zx tt manual yesterday love the car already but has a fewvproblems that needs addressing

 

1.wont boost above 7psi limp mode? The knock sensor has fallen offvand previous owner assure s me thatmonce refitted the car will go back to boosting what it was before 12psi is this true? Or have I another problem

2. Struggles to go in first gear and coming down the gears aswell it has a short shifter installed owner say thats the reason why its stiff and I have got to get used to it is this true I beleive I can also here a wine aswell would a oil change help?

 

Bit off spec about the car if if helps it has

.blitz ecu

0.8mm boost jets

2 bailys dump valves

had a manual convertion

 

any advice would be great cheers

7psi is what's known as safety boost, it restricts boost level to prevent engine damage after seeing knock signals or bad connections to the knock sensor. You can run your ecu codes, I expect you will get code 34. There's a how to on that in the teq section. Once you've identified that as the issue you can work out wether it's the connections/loom fix it and reset the ecu to clear the code, or is the sensor itself is junk you have three options because it's in a god awful place, fit a resistor inline, fit a new one in an easier the access location as a temporary fix or dig the engine bay apart to fix it.

Conversely it might be working and telling you there's an issue, with the car being new to you and of an unknown I would recommend doing a boost leak test and inspecting the coil pack and injector connections for corrosion, it's also worth having a look at the plug condition.

 

12psi should net you about 330hp if it's all working correctly with a generic chip, a lot of them art much cop though so be very careful and keep an ear out for detonation, ideally if it's all an unknown it would be a good shout to get a rolling road to look at it and assess your air fuel ratios etc to see it's running safely.

7psi is what's known as safety boost, it restricts boost level to prevent engine damage after seeing knock signals or bad connections to the knock sensor. You can run your ecu codes, I expect you will get code 34. There's a how to on that in the teq section. Once you've identified that as the issue you can work out wether it's the connections/loom fix it and reset the ecu to clear the code, or is the sensor itself is junk you have three options because it's in a god awful place, fit a resistor inline, fit a new one in an easier the access location as a temporary fix or dig the engine bay apart to fix it.

Conversely it might be working and telling you there's an issue, with the car being new to you and of an unknown I would recommend doing a boost leak test and inspecting the coil pack and injector connections for corrosion, it's also worth having a look at the plug condition.

 

12psi should net you about 330hp if it's all working correctly with a generic chip, a lot of them art much cop though so be very careful and keep an ear out for detonation, ideally if it's all an unknown it would be a good shout to get a rolling road to look at it and assess your air fuel ratios etc to see it's running safely.

 

Oh and ditch the short shifter, change the gearbox oil for some quality stuff line redline 99 and the shifting problem will disappear.

Hello fellow Leicester dweller.

 

Give me a shout if you need any help on the tuning side of things or diagnosing your issues.

Thanks for replys guys gearbox has become much better since changing the oil on it much easier to get in the gears and the bloke I bought it off gave me a 2nd hand wirking knock sensor ans showed me where it connect I just have no idea how it fits and do you know anywhere good who could fit it fir me find thecerror clear the codes ect so its running perfect again or are u yourself able to do that cheers