ICP voltage gauge?

MorganY · Apr 28, 2014

HobbyStock62 said:
So how can you get a correct reading? How is the scan guage or the other one reading it? It seems to me that if it can be scewed right from the sensor it can be scewed from anywhere. If I plug in the snap on scan tool will it give me an accurate volt/psi reading?

Voltage is a correct reading. It cannot be skewed unless there is a vref issue or short. In either case, ICP would default. Actual psi output calculation from the pcm is skewed.

Michael · Apr 28, 2014

MorganY said:
The isspro reads output voltage from the icp sensor. PCM cannot skew the that.

Correct, it is just reading directly from the sensor, the PCM has nothing to do with the output of the sensor, so if the HPOP gauge shows low, you are getting low pressure.

If anyone has problems with one please let me know, the most likely issue is in the solder joint to the connector. They don't make a female side of those connectors so we have to buy ones from a company that makes them as an integral connector on a similar sensor, leaving us a tiny stub to solder each wire to. All problems I have seen were from one of those solder joints breaking. Our guys have gotten better at finding the perfect temperature to get a good joint without melting the connector, so newer ones are typically less likely to have a problem.

Regards,
Michael Pliska

strokin6L · Apr 28, 2014

MorganY said:
Chris. I think we've had this discussion before. Putting the truck back to stock in your case pulled fuel back, giving you the higher pressure reading.

The isspro reads output voltage from the icp sensor. PCM cannot skew the that.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

I know Morgan....I talked to Eric several times about this with his tuning. He told me that both voltage and psi readings can be scewed the same on some trucks when tuned. He told me its all in the tuning.... so idk. For instance...before I started running the MTW stage 3 I would only see 1500psi and 2.3 when tuned with Eric's tuning. Now....for some reason when I had Eric rewrite my tunes for the stage 3....I'm now seeing over 3600psi and 4.5v at 3/4 throttle. I don't know how to explain it Morgan...but that's what Eric told me and that's what I've seen with my truck. Maybe ask him about it...idk. plus eric told me that turning back to stock was the best was to check for an accurate reading. Just giving my experience and what I was told is all.

HobbyStock62 · Apr 29, 2014

ok, so i am confused as to how anyone can get a truly accurate reading without returning tuning to stock?

HobbyStock62 · May 1, 2014

Will it be a toss up weather or not the isspro guage will properly read?

MorganY · May 1, 2014

No. The isspro will work. I've ran Matts and Erics tuning. Both stay consistent with a mechanical gauge.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

HobbyStock62 · May 1, 2014

Alright thanks. Soooo, let's say it holds full ICP. I'm doing the fuel system mid summer, do you think I would be safe to go with 205/75s in the fall? Or is that something that nobody knows and It could maintain ICP fine or it could suck mad wieners?

MorganY · May 1, 2014

crowz said:
LOL Welcome aboard

Depends on who builds them. If it's built right, you'll be able to maintain 2.2ms with with a 205/75

HobbyStock62 · May 1, 2014

Alright. Hopefully it will hold pressure when that time comes.

strokin6L · May 2, 2014

ive had certain tunes only read 1500psi with my ISSPRO and Dakota Digital HPOP gauge(both tapped directly to the ICP sensor)...and other tunes read correct ICP with the same gauges. For me...certain tuning will give me a correct psi readout and others wont.

Michael · May 2, 2014

strokin6L said:
ive had certain tunes only read 1500psi with my ISSPRO and Dakota Digital HPOP gauge(both tapped directly to the ICP sensor)...and other tunes read correct ICP with the same gauges. For me...certain tuning will give me a correct psi readout and others wont.

The ISSPRO gauge reads directly from the ICP sensor, which is a capacitive pressure sensor that is only an input to the PCM (aside from the PCM supplying the regulated 5.0V to power the sensor). I can't see any way a tune can affect the reading without lowering the HPOP pressure itself. In other words, reading DIRECTLY off the sensor like we do, it is the true pressure regardless of the tune. The devices that read ICP through the PCM are the ones that are affected by the tunes as described above (requiring a stock tune to get an accurate reading).

strokin6L · May 2, 2014

That's exactly how I have it wired....directly to the ICP. According to Eric at IDP it can be so idk. Like I said before my truck and some others have experienced the same. Right now I have a tune in the truck where icp won't read over 1500psi. If I switch to Eric's x-street or x-x for this 68mm vgt....I can hit 3600psi at 3/4 throttle no problem. Tuning has shown to play a role on hpop psi readout on my truck.

CSIPSD · May 2, 2014

strokin6L said:
That's exactly how I have it wired....directly to the ICP. According to Eric at IDP it can be so idk. Like I said before my truck and some others have experienced the same. Right now I have a tune in the truck where icp won't read over 1500psi. If I switch to Eric's x-street or x-x for this 68mm vgt....I can hit 3600psi at 3/4 throttle no problem. Tuning has shown to play a role on hpop psi readout on my truck.

Its not possible.... Sorry, but the gauge is only reading what is there. If you doubt it, put a mechanical gauge on there, or buy the TQ App for your phone and watch it thru the OBD-2 port.

strokin6L · May 2, 2014

Idk what to tell ya. It is what it is. Im not doubting my readouts. Just giving my experience with hpop gauge readings with gauge wired directly to icp sensor with the ISSPRO and dakota digital hpop gauge. Its wired directly to the ICP sensor and readouts have gotten scewed with tuning. So tell me then why I can load one tune up and run the truck and only see 1500psi and then load another tune up and run it and see over 3600psi? Not being a dik my any means...but can you explain it? Just trying to understand why my truck reads what it does for ICP when its wired the way it should be.

swinky · May 3, 2014

So is 4.5v okay? I'm getting 4.5 on a full fuel tune with 190/75s and a 220k mile hpop.

Sent from my HTC One using Tapatalk

ford rules · May 3, 2014

4.5V is fine.

swinky · May 3, 2014

Thanks bud

Sent from my HTC One using Tapatalk

ford rules · May 3, 2014

ICP voltage

(PSI) (MPA) Voltage
0 0 .02v
200 1.5 .4v
400 3 0.73v
600 4 .96v
800 5.5 1.2v
1000 7 1.4v
1200 8 1.6v
1400 9.7 1.9v
1600 11 2.1v
1800 12.4 2.3v
2000 13.8 2.6v
2200 15.2 2.8v
2400 16.5 3v
2600 18 3.3v
2800 19.3 3.5v
3000 20.6 3.8v
3200 22 4v
3400 23.4 4.2
3600 24.8 4.3
3800 26.2 4.5
4000 27.5. 4.7v
4200 29.3 4.9v
Not sure if you saw this one posted earlier.