SR sensors on Coilpack bracket? (181kb)

[Neil]

I got this whole thing when I bought a Coilpack. I know what the coil pack is, but what are the other thingies for? I've read around where people say if you get a motorset it usually doesn't come with wastegate actuator things so it opens gradually between 0 and 7psi, instead of closed but opens sharply at 7psi. Are these for that functionality?

The black cap on the green sensor ( the >right> one) can turn but it doesn't have a stop, nor does it even indicate +/- per direction. I wonder what it is used to adjust or even if youre supposed to turn it? Of the 2 lines on it one of them is capped off. if i remove the cap and blow air through it it sounds like its exiting from under that turnable black cap on top. The other one I cannot blow or pull air through at all, so I assume that one is a vacuum sensor, or actuator of some kind. I assume the line that's capped got a cap from the previous owner for some homemade mod, because why would they make the blowthrough and not use it? another reason why i think its a cheap homemade mod is cuz the cap is so badly dry rotted already that its probly cheap *** material, which im (merely) assuming Nissan wouldnt use.

The other one on the Left also has two lines which tells me its a differential pressure sensor to keep some valve's operation in check. but which? Is this the one for the wastegate?

[SpeedRacer1]

I didnt read your post but the thing on the left is the boost control solenoid. Top nipple goes to the hole in the intake pipe. The bottom hole goes to a T between the wastegate and the cold pipe.

The green thing on the right is EGR equipment between the recirc and EGR. Toss it in the trash.

[Neil]

Thanks,

though the vacuum line routing confuses me as to what that would actually do to control boost.

I can see something working out if one was 'from cold pipe' and the other was 'to wastegate', but i dunno.

im lost if it t's into a line from the coldpipe to the wastegate... cuz whatever happens inside that valve the pressure would mainly run past it and go to the wastegate anyway.

unless it Stays open and recirculates to the intake till 7psi is reached then it electronically closes and the extra pressure that now can't escape to the intake forces the wastegate to open?

that would make sense...
Modified by Neil at 8:45 PM 11/6/2005

[SpeedRacer1]

My best guess, ECU gets a signal that the boost is too high (anything above 7 psi) it then opens a valve in the solenoid and bleeds the extra wastegate signal vacuum into the intake stream. The intake stream is always in vacuum so it will take the metered air in with no problem. Basically it bleeds the extra wastegate air out just like a manual boost controller.

[slow s13]

yeah I got those when I bought a used ignitor assembly, just toss them they are junk. I would just cliped the wires off nad wrap them into the harness, the ecu wont even throw any codes and the engine will work just fine.

[Neil]

im being told on other forums to ditch it too.

however, If it helps the turbo spool up faster im all for it. I believe that's its intent. otherwise, the wastegate opens little by little untill 7psi. With this thing it helps it stay closed untill 7psi is reached, then it snaps open.

Seems to me if the street-rod SR engineers didnt think it was helpful, they wouldnt have spent the money on R&D.

but then they did make that ****ing gay dampener box for the clutch.

[95lstegman]

hmm this little bugger's usefulness perplexes me, too. i'd like to think it's useful. tell you what. maybe i'll go out and get some vacuum hoses some time and hook it up and see if there's a difference. my guess is not really. but i would take a gander that this thing is part of the ECU's control over boost in first gear. i've got stock turbo, i/c, and boost, so i'm not sure the ECU would stop me from hitting full boost in first gear anyways, and in any case, i hit full boost in first with open diff and i don't lose traction if i'm pointed straight anyways.

::subscribing to thread::

[Neil]

I got this answer from another forum. Apparantly its only used to ensure anything over 7psi is not reached. good nitty gritty info though

its not going to feel any more torquey opening slowly because your not building boost to make torque, and the solenoid only really keeps the boost at a constant 7 psi, if it goes above it opens and vents excess out of the "cap" you are refering to. that is the atmospheric vent to bleed boost pressure to the wastegate, when you run the line from the throttle body to the wastegate it takes so loong to see boost it will come on a litle slow anyway. and regaurdless it will take a little time to build boost but if your on the highway or something you want it to boost full pretty quick to pass or something so I dont know why you would want it to make boost slow anyway, and keep in mind how a wastegate works, it stays shut untill the set amount of boost opens it then it regulates that pressure not the opposite, so the only way to make the car spool slower would be to bleed boost before the wastegate but this would also increase boost, so technically the solenoid doesnt really do you any good.[right][snapback]57807[/snapback][/right]

[95lstegman]

yeah, that's what i got from Jay at XAT today. he said all it does is prevent overboost (over stock boost).

[biglipzit]

Actually IN JAPAN they leave it in the car and when people buy electronic boost controllers, they hook them up to the ecu and use that boost control colenoid instead of bothering to buy a seperate other boost control solenoid. I am not sure how well it works but that is how it was done on my car when it came from japan.

[95lstegman]

Actually IN JAPAN they leave it in the car and when people buy electronic boost controllers, they hook them up to the ecu and use that boost control colenoid instead of bothering to buy a seperate other boost control solenoid. I am not sure how well it works but that is how it was done on my car when it came from japan.

that's interesting but with mad tight super sick boost controllers these days like the AVC-R i don't see a point in that. if i could get my hands on an AVC-R . . .

[SpeedRacer1]

Parts like the Power FC use that boost control solenoid wiring together with an AVC-R for controlling boost. Its an option, not required to run a power fc.