How to verify both GT500 pumps are working?

[lito]

A few comments.

- The pumps have to be tuned, fact.

- There is an adaptive for FPVT but if you have not relaid the table it won't learn where you do not allow to. Also, as commented if too far off, won't learn as it will sweeping the old time.

- Dropping the value file is better than nothing but is still not the end solution. Stay away from value file tuners. (This was not meant to you BruceH as you are a PRP user but I am quite sure you've learned more of the system than many "tooners")

- GT pumps and GT500 pumps are the exact same electrical/mechanical pump.

- There is a PID and a DMR for logging the DC with LL. For those that say that it doesn't reach 50%, you are reading the PID that is halved. 0.500=100%.

- Not every system will work the same, there are conditions that affect final outings of the kit like losses common on PD blowers, commanded deltaPs, fitter/lines conditions, etc.

I think that covers it.

 

[dmhines]

I spoke with JDM this morning on the phone. Basically I was told again they don't make any updates for GT500 pumps. They never have and they have never had a need to. They have hundreds of customers running their tunes and are performing just fine. Does Jim SR have a secret technique? Maybe. I'm going to data log at WOT today and see what DC looks like. Jim did say it should be halved at WOT.

 

[1lowtoy]

I spoke with JDM this morning on the phone. Basically I was told again they don't make any updates for GT500 pumps. They never have and they have never had a need to. They have hundreds of customers running their tunes and are performing just fine. Does Jim SR have a secret technique? Maybe. I'm going to data log at WOT today and see what DC looks like. Jim did say it should be halved at WOT.

The fact that they don't calibrate for the pumps properly and it works "ok" doesn't mean that everybody should settle for it. There is a reason that Ford has the table there and that it was calibrated to begin with. It should be done properly. What PID are you logging for fuel pump duty cycle? This can show duty cycle to be reported half of what it really is.

 

[dmhines]

I just did some WOT runs with datalog. I'm thinking the GT500 tables are already in there.

OEM pump at 5400 Rpm with 1.2 Load my DC was at .86
Gt500 pumps at 5400 RPM with 1.21 Load my DC was at .62.

PIDS: RPM, LOAD, RTLS FPUMP DTYC

FPUMP FLOW RATE maxed at 3.821. I'll need a dyno run to confirm it will go over 4.0 which is max for GT pump.

 

[1lowtoy]

How stable is your fuel pressure? Tip in/out and under full throttle?

 

[dmhines]

How stable is your fuel pressure? Tip in/out and under full throttle?

which PID is that? I may not have logged it.

I did log RTLS VTAB X INPUT AND Y INPUT figuring this might be the fuel table.

X INPUT maxed at 7.864 and Y maxed at 2.044

 

[1lowtoy]

Log "PRES DROP F INJ".

 

[dmhines]

Log "PRES DROP F INJ".

crap. forgot to check that one.

I also logged actual and table fuel pump voltage. they were mostly identical but did deviate as much as .2 in some areas which is less than 3% deviation.

 

[stang67gt]

- Not every system will work the same, there are conditions that affect final outings of the kit like losses common on PD blowers, commanded deltaPs, fitter/lines conditions, etc.

Agreed. I look at the value files as guidelines and not the end result.

With that, here is was SCT changed in the value file...
sorry if its a little hard to read
TSG0-1 is Gt500 fuel pump value file
TSG0 is the stock file

 

[dmhines]

Agreed. I look at the value files as guidelines and not the end result.

With that, here is was SCT changed in the value file...
sorry if its a little hard to read
TSG0-1 is Gt500 fuel pump value file
TSG0 is the stock file

TSG0-1 is for a GT500 though isn't it? It appears those numbers are for a car with 50lb injectors.

I did more datalogging last night to log PRES DROP F INJ. Pressure stayed between 39 and 39.2 from 2500-5500 RPM at full Load and Full Boost.

Looks like the JDM tune is good to go ... I'm thinking it's tuned for GT500 pumps and is adapting to a GT pump.