Peeps,

 

Ive come to the obvious conclusion that the boost has been upped in my latest zed, as it is currently running 0.7 of a bar (10.5 psi).

 

Would i be right in assuming that the only 3 ways that this could have been done is:

 

Boost Jets,

Manual boost controller

or

Electronic boost controller.

 

My car has neither sort of boost controller, so im assuming that its had boost jets fitting. If this is that case, what size do you think they would be to only provide an extra 3.5 psi of boost? secondly, as ive never had a zed that uses jets, where are these fitted and how do i get to them?

 

Finally, im also assuming that its been chipped to deal with the additional boost as its not showing any signs of detting. Being a series 4 (1995) is there any physical differences in the chips, apart from the fact mine will be a 32bit. Secondly, how can i find out what map is on the chip it appears to be a nameless one. Would it mean a trip up to JD, or is there readily accessable software i could install so i could just hook up the ecu to my lappy and analyze the map myself.

 

Also, am i right in thinking that even though the 95's have a different design of injector, the actual flow rating (370cc) remains the same?

 

Cheers in advance

 

Nick

Peeps,

 

Ive come to the obvious conclusion that the boost has been upped in my latest zed, as it is currently running 0.7 of a bar (10.5 psi).

 

Would i be right in assuming that the only 3 ways that this could have been done is:

 

Boost Jets,

Manual boost controller

or

Electronic boost controller.

 

My car has neither sort of boost controller, so im assuming that its had boost jets fitting. If this is that case, what size do you think they would be to only provide an extra 3.5 psi of boost? secondly, as ive never had a zed that uses jets, where are these fitted and how do i get to them?

 

Finally, im also assuming that its been chipped to deal with the additional boost as its not showing any signs of detting. Being a series 4 (1995) is there any physical differences in the chips, apart from the fact mine will be a 32bit. Secondly, how can i find out what map is on the chip it appears to be a nameless one. Would it mean a trip up to JD, or is there readily accessable software i could install so i could just hook up the ecu to my lappy and analyze the map myself.

 

Also, am i right in thinking that even though the 95's have a different design of injector, the actual flow rating (370cc) remains the same?

 

Cheers in advance

 

Nick

 

is .7 bar not standard boost?

thats what i thought.

to my knowledge extended boost should be 9.5 psi

Sounds about right.

 

unplug the stock boost solenoids and you will get actuator boost, about 4 psi.

 

If it stays the same when they are unplugged then you must have an added valve somewhere.

 

Also how have you taken the 0.7 (10.15 psi) bar reading as thats not much far off stock.

9 psi is about standard and with it being so cold it could just be over boosting and the oem guage is crap anyway so get an aftermarket guage on there to check it.

 

Mike

Sounds about right.

 

unplug the stock boost solenoids and you will get actuator boost, about 4 psi.

 

If it stays the same when they are unplugged then you must have an added valve somewhere.

 

Also how have you taken the 0.7 (10.15 psi) bar reading as thats not much far off stock.

 

when you say unplug do you meanjust the conectors or the actual piping?

when you say unplug do you meanjust the conectors or the actual piping?

 

just disconnect the harness...

the harness you mean the little metal thing attached to both sides of the engine?

also a good exhaust will reduce back pressure so it'll boost to 10psi :)

yeah, just the wiring plug on each one

 

Ecu will not notice it no longer has control of the overboost level.

 

Then you are just left with the mechanical actuators, same as 'safty boost' but without the ecu error.

 

Mine are disconnected, electronic overboost is now controlled only by my ebc.

 

Currently cira 16psi

i cant seem to get past 12 psi without detting. :(

Timing out? Injectors failing?

hmmm injectors failing..... hmmmmm

i knowthe timing is bang on 15 degrees.

i kinda came to the conclucion that the amature who replaced the timing belt has fitted it a tooth out :(

how can i test the injectors for faults?

4 way adjustable acuators . :)

Peeps,

 

Ive come to the obvious conclusion that the boost has been upped in my latest zed, as it is currently running 0.7 of a bar (10.5 psi).

 

Would i be right in assuming that the only 3 ways that this could have been done is:

 

Boost Jets,

Manual boost controller

or

Electronic boost controller.

 

My car has neither sort of boost controller, so im assuming that its had boost jets fitting. If this is that case, what size do you think they would be to only provide an extra 3.5 psi of boost? secondly, as ive never had a zed that uses jets, where are these fitted and how do i get to them?

 

Finally, im also assuming that its been chipped to deal with the additional boost as its not showing any signs of detting. Being a series 4 (1995) is there any physical differences in the chips, apart from the fact mine will be a 32bit. Secondly, how can i find out what map is on the chip it appears to be a nameless one. Would it mean a trip up to JD, or is there readily accessable software i could install so i could just hook up the ecu to my lappy and analyze the map myself.

 

Also, am i right in thinking that even though the 95's have a different design of injector, the actual flow rating (370cc) remains the same?

 

Cheers in advance

 

Nick

 

I've had a 1996 zed for a while, there seems to be a bit more grunt lower down than earlier engine - might be because of the vtc being removed.

 

More than likely if it has been chipped it has simply being replaced with a pre 1995 ecu as this works fine! only way you'll know is by opening it up and having a look for the socket.

 

The shape of the injector changed to a standard injector around 95 but the cc is no different, makes upgrades bit cheaper tho as no need for a fuel rail adapter!

 

 

Hope thats not preaching to the choir

 

Ste.

See i knew 9 psi was standard, hence saying the boost has been upped. Im taking my readings of defi gauges, and it boosts consistantly a 10.5 psi, and holds at this setting rather than a small amount of overboost then dropping down to 9 psi, regardless of the ambient temperature.

 

Ill have to look at the ecu tomorrow. Has any one got a picture showing the difference between the 16bit and 32bit ecu's. As mentioned by Ste, would be interested to see.

 

TBH this car is deffinatly quicker than my old zed when they were both at this state of tune (filter and cat back exhaust). My old zed dyno'd at 296bhp fwhp and this one has been dyno'd and 310 fwhp, so this extra 15 hp has got to have come from somewhere (cant remember what the torque figure was on my old one, but ive got the dyno sheet for this car somewhere so ill have a look in the morning)

 

cheers for the responses

 

Nick

See i knew 9 psi was standard, hence saying the boost has been upped. Im taking my readings of defi gauges, and it boosts consistantly a 10.5 psi, and holds at this setting rather than a small amount of overboost then dropping down to 9 psi, regardless of the ambient temperature.

 

Ill have to look at the ecu tomorrow. Has any one got a picture showing the difference between the 16bit and 32bit ecu's. As mentioned by Ste, would be interested to see.

 

TBH this car is deffinatly quicker than my old zed when they were both at this state of tune (filter and cat back exhaust). My old zed dyno'd at 296bhp fwhp and this one has been dyno'd and 310 fwhp, so this extra 15 hp has got to have come from somewhere (cant remember what the torque figure was on my old one, but ive got the dyno sheet for this car somewhere so ill have a look in the morning)

 

cheers for the responses

 

Nick

 

Not my field of expertise but i think the 32 bit is rarely chipped as the car runs the same on a 16 bit chip so will more than likely be a 16 bit if its socketed.

 

Bear in mind mate that your new car is 4 or more years younger than your previous and sales of 95 onwards where that it was only fans of the car that brought them and as such will more than likely not have the nuts thrashed off it like the earlier models which were more of a fashion statement for alot, so the engines going to be in a better state.

 

mig tips are easy to find if they're there pop off the the small wastegate vacumm hoses and they'll fall out!

 

Would of thought they would of raised boost more than that but i guess it depends on the size of the mig tip.

 

HTH

 

Ste

To be fair, 15bhp on a car like these is nothing. It could have had that anomoly since it left the factory. A manufacturers spec of x bhp is normally an average of what the cars actually are. Especially on more performance stuff, look at the skyline often far more than its factory rated spec!

To be fair, 15bhp on a car like these is nothing. It could have had that anomoly since it left the factory. A manufacturers spec of x bhp is normally an average of what the cars actually are. Especially on more performance stuff, look at the skyline often far more than its factory rated spec!

 

Ditto to that. All cars perform differently. You might have good compression on good turbos, that makes a difference. So does RR calibration. 15bhp is negligable.

9.8 psi is STD IIRC, so your up 0.7psi which is rat all. Atmospheric pressure could affect you that much! Or the cold winter aircooler air is denser so as it heats it would expand giving the effect of a higher pressure depending where the pressure is measured from... Not sure if this could happen within the engine bay but surly an ambient of 0*c and an ambient of 30*c is going to affect it in some ways!

 

I'll be honest i just made that bit up but it makes sense in my brain!

To be fair, 15bhp on a car like these is nothing. It could have had that anomoly since it left the factory. A manufacturers spec of x bhp is normally an average of what the cars actually are. Especially on more performance stuff, look at the skyline often far more than its factory rated spec!

 

Thats very true.

 

well it may just be the case, that purely and simply, i have strong engine. And thats something i dont intend on winging about!!! :duffer:

 

To be honest, upping the boost is the very last thing i intend to do (unlike last time where i was a power hungry 21 year old). This time everything is going to be in place before upping the boost, ie 555's uprated SMIC's, Full GTR brake set up etc.

 

Looks like i may have struck gold with this one, but only time will tell :wack:

.. and a good free flow unchoked intake kit allows denser air in to start with so it all helps!

 

There was a chart by Stillen that showed 10.5psi with the only mods being intake kit and exhaust so I thought that the better breathing out and in was where the tiny bit of extra boost pressure was coming from. My stock guage shows these kind of levels with those same mods. Like to believe it's true but as people say the stock guage is not so accurate nor are many of the after market ones.