As the title says, Just want to get an idea of how common this is?
Yes Bypassed it, to hell with those nissan engineers
No thought best to leave it
Whats a Hot Start Solenoid?
As the title says, Just want to get an idea of how common this is?
yarr
Although I didn't do it myself, SE Nissan did it whilst they were putting another fecked engine in
me, actually it is very common indeed - works a treat too
get rid of it - the whole thing is just a waste of hose...
mine's in the bin.
Made no noticeable difference.
I removed mine a couple of months or so ago.
Sideways danny kept on thretaning to rip it out at MK
mine's bypassed... and soon to return as a dodgy boost controller switchy thing
i ripped the bugger out of two actually, pulled it out of the loop in glens too
white '94 s13 200sx scrapped - mapped to 1.45bar. OS giken box, garrett GT2876R, 950cc injectors, ORC twin plate, nistune. 349bhp/325lbft @ 1.3bar CA18DET
white '96 s13 180sx - type g with more kouki bits
current status: 180 a bit broken but to be repaired.
sideways dannt ripped mine out to. whats difference does it make anyway?
Paul
Before I even drove mine I was told I didn't need it anyway, so the pipes formerly attached to it are now bodged as my DV vacuum hosing.
Its a switch to swap the vacum connection to the top of the FRP between the airflow just behind the AFM and the back of the plenum.
As to the point, best ask somone else!
I voted "ditched" although i havnet got round to unscrewing it yet.
Mine's been binned
Yep removed mine.....well bypassed it. On the day I am sure if made a difference to my lump running but I am not sure now as its still lumpy....
heh, nice reply symbol.
I also bypased FPR solenoid yesterday and it made huge difference to gas pedal response, now it feels like rocket
mines still in, been thinking about ripping it out but i dont know about the benifits i will gain/ what i will lose. so iv left it in for now. as the saying goes.......... if its running right, dont mess...
@IRS13
Run not walk to get rid of it.
Why ? Here my theory about the Holy Shit Solenoid....
Our ECU isn't aware of boost levels above 0,25 til 0,3 bar.
The highest load map only calcs with this value.
At every boost level above that the injectors open for
the same time. If they are oben as example for 77% at 0,3 bar
they are exactly 77% open at 1.2bar.
So, where is the more required fuel ?
The Fuel Pressure Regulator sees all values from vacuum, atmosphere
til boost. Accordingly to this the fuel pressure before the injectors
is changed as required. This way we get more fuel in the same time
through the injectors.
A little bit simplified but take a look what happens when the
FPR sees this three states at his control hose...
vacuum = lean
atmosphere = rich
boost = richer
So if you start the car and it idles you have vacuum.
That's fine and while idling the engine didn't need a rich mixture.
For a Cold Start Nissan thought it would be nice to "Enrich" this
for three minutes. So, if you start the car the solenoid is
triggered for three minutes and instead of seeing vacuum while
idling now the FPR sees "atmoshpere " and the mixture is richer.
This is fine for a cold start, off course.
But imagine you run highspeed over the highway and your tank
is emptry. You make a tankstop. Then fire up the car again and
because the engine is warm you gave again immediatly full throttle.
Now comes the problem. After starting the car new the ECU again
triggers for 3 minutes the FPR to atmoshpere. But you are on
boost now. This boost didn't reach the FPR for 3 minutes and
so you're not running "richer" as required. You ran damn lean.
No fuel control anymore over the FPR.
If you never have this worst case scenario nothing happended
and you can let it in. You only have then 2m hose routing
back and forth which cannot make the reaction time of the FPR
better. The responsetime is better with a short 10cm hose.
I had never problems with coldstarts since i removed this item.
And when i have a rolling road session i now didn't have fear
anymore. Before it happens that the guy there didn't let the
engine idle 3 minutes before a power run. Now he can do it.
Perharps someone else can measure the Hotstart Solenoid signal
for comparison. (the 3 minute thing)
It's long ago but i remember that my europe ECU behaves soo ...
hope this was of any help
cheers
Rainer
yep mines going too
thats a feckin good reason to rip it out
ill have ago at this tommorow, thanks for the explanation
Yepp , the "without club" must grow
It would be even nicer if someone could check cross the 3 minute
thing for safety reasons ...
.. and the "long hose - less response" part is reason enough...
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