i have two more questions concerning the map sensor and a fuel pressure sending unit.

on the map, i have a boost controller that uses a 3 bar map sensor. my plan is to piggy back the signal from this for the tecgt. as i was getting ready to wire it in tonight it donned on me i only need to hook up the signal wire becuase the map has power and ground already. am i on the correct line of thouht with this, just tap the signal wire into the existing map sensor that is used on boost controller?

second question deals with a fuel pressure sending unit. im using one of the gp i/o for the sender. now, do i hook up a ground black/white wire to it like the iat and coolant sensor wires as shown on pg90 fig. g3.2 or do i use a 5v red/grey wire ? im going to use an FJO pressure transducer. also, on the wintec 4 software under the general purpose i/o control manager, for whichever gp i/o i use, do i use the "custom #1" or " custom #2" setting. if one of these two are used you jsut set rpm at 500 say?

now, to view fuel pressure from pc i just have to look at flight log as engine is running?

just have this little hurdle and the basics will be done on the wiring.

ty
dean

I'm not really sure what it is that you're trying to do with the pressure transducer. If you need to record that, you need to use an input mode for the GPIO, like Analog Voltage. Then, how many wires does this sensor need? If it's only 1 or 2, it's not going to work with the GPIO without some other things. A 1 or 2-wire sensor is resistive and will require a pullup resistor from the signal wire to +5v. If there is a second wire it should go to sensor ground. If it's a three wire sensor, this will work the best. It will require power, ground and provide a signal. It will alos have the most linear response. None of these options will show PSI of fuel pressure. You'll need to log the voltage and convert to PSI from the recorded voltages.

Piggy backing from the MAP sensor you have is possible, you'll just need to hook the sensor ground from the TEC up to the sensor ground on the MAP sensor. But you'll need to be careful with boost controller map sensors. Not all of them are absolute pressure sensors. Unless you know that you have the right kind of sensor, I'd run a seperate MAP sensor for the ECU. If you send me a little info on the boost controller and the sensor it uses I can help you determine if you've got the right part. If you know for fact that it's just a GM sensor, don't worry about it, you'll be fine.

well shoot,

im kind of bummbed with respect to being able to data log the information. the primary reason why i wanted to data log and view the informaton is to compare the fuel pressure to boost pressure, rpm, etc. also, im running a high base fuel pressure and there are not to many companies that make fuel pressure guages that go over 100 psi.


fjo makes the sensor that i was going to use for this. i can only assume it is a two wire setup. but they do have a digital guage too so i guess ill just buy the whole setup and us it.

as for map sensor, it is a GM 3-bar map sensor. waht your saying on this is to hook the ground and single wires to it. i do have another GM 3-bar map sensor as well and could hook that up too if you feel that would be best.

i just dont want any issues. i know one little thing can lead to baldness.... lol i just want it to be a smooth transition to getting it running.

thank you for taking time to reply to my posts
dean

If it's a GM 3-bar, you can just hook up the ground and signal wires and you'll be fine.

Another option for fuel pressure is to go the auto parts store and pick the oil pressure sensor for a recent Corvette (I'll have to check that in the morning when I get to work). They're pretty cheap (less than $50 I think) and they measure up the 120 psi. I mention this becuase it's a three wire sensor (+5v, Ground, signal) and has a nice linear voltage output to get pressure. You can run it into a GPI with the analog voltage function and you'll be able to see the fuel pressure trends a whole which will tell you a lot by itself. Then, if you need to know what the pressure is at a given point, the conversion is subtract .5v and multiply by 30 to get psi.

Here's the sensor info you need:
BWD part number S4201 or S4202.
These are available at Advanced Auto parts for 00-05 Buick LeSabre (S4201) or 04-06 Pontiac GTO (S4202). There are others but I know those work.

The sensors are the same but S4201 has 1/4" NPT thread and S4202 has M16x1.5 thread with a copper or aluminum gasket.

The connector is available from BWD P/N PT217. I think you can order it from Advanced, but it's unlikely they would have it in stock. It's the same connector as the new-style GM TPS, but I'm not sure if it's a part we carry. I'll let you know once I can find out.

thank you very much for your help. ill go to autozone, kragen, local flaps, etc and see if i can pick one up. the 50 bucks sounds lot better then 200 for the FJO guage and sensor.

sent off email to FJO.... there sensors are three wire, 0-5v..

i found the s4201 around town, as cheap as 35 dollars. i didnt dig the 1/4npt thread size.

If hte FJO sensors are 0-5v 3-wire sensors, you can use those the same as the BWD sensors I listed above. If you don't like the pipe thread, don't forget that the s4202 has a metric straight thread (M16 x 1.5) with a copper gakset. Should be able to find that one just as easily.

ah, ok.. ty

i thought m16 was as big... it sounds big haha. after doing a little research i see its about same size or smaller then 1/8npt. autometer sells an adapter.

awsome, ty for your help jon

if you use oem pig tail, here is wire diag

blue=sig
blk=hot
grey=neg

looking at it

sig
____

neg | | hot