E40 gto safe mode

[saleen9973]

Well i fired up my gto today. I tuned it speed density with a dpe 2.5 map, 72lb FIC injectors and a torqstorm blower. It fired right up and idled great until it warmed up then it started to surge and the dash read safe mode. Also i noticed the afr was perfect while warming up it was between 14.2-14.7. then once warm bam pegged rich and that safe mode thing and surging. I let it cool a bit and started it again, it ran for a minute then died and wont restart. Any sugestions?

[saleen9973]

Its a stock ls2 long block no cam, auto car. Put it on the code scanner and it says no codes.

[Lakegoat]

Your IFR table is set up like a return system, your volts vs vac is set up like a dead head system---and you said that you had 72# injectors. Table says 63.5 across the board, and that is the limit on the E40 computer. You have to double stoich, half ifr, and half IVT Terms (afr) and tune in lambda. Find out if the 72# is at 43psi or 58psi. You need to use the 58psi numbers and half them unless you are running 43 psi pressure. If you are running the stock dead head fuel system, you need to make the ifr table like stock (increasing).
Power enrichment--Map enable, change to 85kpa. Rpm delay change to 0, Enrichment ramp change to 2.0000
I know these numbers will change, but look at your primary and boost ve table. Row 105kpa should be the same on both charts so there is no blip when changing tables in boost. Then smooth it out.

[saleen9973]

I will try those things. I called the tuning school and they told me to use the put the 63.5 in for the injectors then use the multiplier for the size difference. They said i didn't have to do the double stoich method. I am still unclear about this method. So if i am using 72lb inj the put in 36 for the injectors then 29.4 for stoich? Also when i cut and paste the injectors data from fuel injector clinic the numbers change very slightly. I used their data for the e40 ecu.

[saleen9973]

Sorry if i am slow to pick this stuff up. This is the first time i have ever messed with a cars ecu. Thanks for the patience and advice.

[saleen9973]

And yes i do have a stock style dead head fuel system. I should set that back to stock right? I made the other changes you suggested, i copied the 105kpa table from PE over to BE then smoothed between vertical lines. Then injector data is 72lbs @ 58psi. Also when i half the IFR table it goes to 31.7, now my question is how do i make it increasing like you stated? all cells say 31.7.

[Lakegoat]

FIC should have the correct IFR flow rate for the dead head system. Look at your stock file at your IFR flow chart. It starts low and increases. That is how the FIC chart should look. Yes, the cut and paste numbers change slightly on the offset vac table. Did you use their min injector pulse and short pulse limit?
The double stoich is easy---get the correct FIC numbers for the dead head IFR table, cut it in half, put it in the chart. Double stoich--29.4 (actually most gas station 93 is 14.3 so you could make it 28.6000 to be correct). Half IVT Terms to 3.96. Done------except now you have to tune in Lambda instead of AFR. AFR will not be correct. Lambda is always 1 so that is easy. Above 1 is lean, below 1 is rich.

[Lakegoat]

Website says 82.70 at 0kpa to 90.30at 80kpa, 58psi, E40 computer. Here is how your IFR table should look (if you do the double stoich) if those numbers are correct from the website. The multiplier will have to be changed to 1.00. I don't know how the school gave you 1.13 if they flow 80#.
Go to FIC website and open GM data and go to the bottom of the spread sheet and click on pulse width adder. Use the pw adder and min pulse width from that chart in your tune.

[saleen9973]

so i started the car up with the changes. It starts great. then while it was warming up i hit the gas around 110 coolant temp and it started surging and dash said reduced power mode safe mode and i shut it off. I did log the event.

[saleen9973]

here are the changes i made.

[saleen9973]

here is the log.

[saleen9973]

I was outside messing with the car when you sent me the last notes so the file and log dont incorporate your last suggestion

[Lakegoat]

Get that other stuff fixed because it is running pig rich at idle. In DTC's, make P0101 MIL on first error!! In Engine Diagnostics, make MAF low fail 1 instead of 0 in the second box down.

[Lakegoat]

You need to log some more things also. Here is my channels setup

[Lakegoat]

Make this whole table 100 except the 0 row across

[Lakegoat]

Is the maf gone out of the intake? Relocated IAT? If no Maf, go to airflow--dynamic and make Hi rpm disable 8000 and reenable 7900.
Quit logging mass airflow in channels, it can skew your airflow readings. Where is your wideband?

[Lakegoat]

I looked at you log again and your Intake air degrees stayed about the same. Do you have it hanging outside somewhere? It is an important part of fueling calcs---gotta be in the intake after the blower.

[Lakegoat]

Make this whole table 100 except the 0 row across

[saleen9973]

The MAF is out of the car totally. I have a break out harness off the maf connector for the IAT, its in the intake tube about 10-12 inches from the throttle body after the bov.

[Lakegoat]

You log showed the IAT to be around 45 to 46 degrees all the time it was running. Is it wired correctly.