PFF - Pennock's Fiero Forum, PDA Edition

LS4 / F40 swap - fieroguru (Page 87/216)

Bozzie

JUL 20, 09:48 AM

Mine does the same thing. Had it Cyro'd and put back together tighter and it still does. Other than that no problem with it.

fieroguru

JUL 20, 09:25 PM

Did some more refinement to the part throttle tune today... The camshaft is quite large for the 5.3L and my narrow band O2 sensor is further from the engine than stock, so while in closed loop I could "feel" the narrow band O2 sensor swing rich/lean. Reducing the Closed Loop Proportional by 90% helped it, but it was still there and quite annoying.

This pulsing with the narrow band O2 goes away when running open loop, so I switched back to 100% open loop. I did a couple of 100% OL MAF and 100% OL SD logs today just to make sure they are dialed in as close as possible (less than 1% error) and then combined them in a Dynamic OL tune. So under 4000 rpm, the ecm will be using both MAF and SD to determine fueling and then 100% MAF over 4000 RPM. While doing this, I didn't mess with anything in the WOT ranges since it was dialed in on the dyno. Car runs nice and smooth in open loop.

The added benefit of running 100% Open Loop is I can change the A/F ratio for various airflows. I am still trying to break 30mpg on the interstate and improve on the 20mpg for the last 3 tanks doing my daily commute. So during the log I recorded the Hz from the MAF at idle and 60-70 mph as well as the kPa/RPM on the speed density side. Then on the MAF calibration, I reduced everything under 4000Hz by 7% and also took 7% from the group of cells connecting Idle to cruise range in kPa/RPM (43-60kPa and 400 to 2400 RPM) . The adjacent cells were reduced 3.5% to smooth the transition back to 14.7. These changes now allow idle and cruising to be in the 15.5-15.9 A/F range and back to 14.7 to 15.0 when under moderate acceleration.

I will be monitoring the logs while using this modified open loop tune checking for knock and various temps. But so far it runs fine with this new tune on my normal test route.

[This message has been edited by fieroguru (edited 07-20-2013).]

fieroguru

JUL 21, 04:34 PM

sig test

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1988 Notchie: LS4/F40, 382 whp @ 6800 rpm, 325 wtq @ 5000 rpm, 2807 curb weight, 29 mpg 70-75 mph, 20 mpg on my daily commute. 4" CAI, LS7 MAF, LS2: TB, Intake, Injectors, 224/232 cam, E67 ECM, LS7 Exhaust manifolds, Magnaflow muffler, 12 lbs aluminum flywheel, 10" Spec stage 4+ clutch, 13" rotor conversion, rear lateral link relocation brackets, rod end lateral link upgrade, top of struts relocated 1" inboard, cut FJF front springs, Koni shocks up front, with 275 lbs/in rear coil overs.

fieroguru

JUL 23, 08:49 AM

In my quest to get DoD active, I went back to square one and listed the DoD Inhibitors (as specified in the service manual), then scanned for the actual data values at cruise RPM (where scanning was possible), compared thos values to the ones either in the DoD tables within the configuration file or the service manual. After doing all this and multiple brainstorming discussions with Darth Fiero... DoD still doesn't work.

This images is larger than 153600 bytes. Click to view.

This images is larger than 153600 bytes. Click to view.

Darth's theory at this point (and I agree with him) is that the BCM must be hooked up for DoD to work with the Gen 4 ECM's including the E67. The brake position switch goes through the BCM and this is believed to be the issue. There are only two LS4 swaps currently using the E67 (mine and the last one Darth did) and neither can perform a Case Learn nor will the electronic crusie control work. A review of the LS3 crate engine calibrations show the same issue with the P0315 code diabled (can't perform the case learn), as well as misfire detection, and no cruise control option. Even GM couldn't get the E67 to work 100% in a standalone condition.

The brake position switch status is the likely culprit as it must be seen by the ecm to perform a case learn and for cruise control to work. Since DoD also needs to shut off when the brake is pressed, it needs this input as well, and it likely uses the same input method as the cruise. The inhibit list includes a parameter "Engine Brake Torque Management" that must use a brake input of some kind. While this feature is disabled in the FWD DoD configuration, it still must use the brake switch to turn off V4 mode when the brake is pressed.

There is a 12V brake switch input directly to the ECM, but it appears the ECM doesn't use this input for anything, as both the E67 LS4's have this hooked up, but we still can't perform some of the other fucntions that require knowing the brake pedal is pressed.

So the next step is to go back to the additional controller to see if the brake switch can be routed through this new controller and share this info through the CAN line.

Another tidbit of info that isn't listed in the service manual, is on the Gen 4 ECM's, if Cat Over Temp (COT) is disabled in the calibration, DoD will not longer work. This has been proven through multiple sources where long tubes were added to a DoD vehicle, COT disabled, DoD stopped working, the customer went back to have COT enabled, then DoD worked again.

Will

JUL 23, 11:49 AM

Do you have a photo showing how tight the LS4 crank pulley is to the timing cover? You don't know the pulley part number off hand, do you?

My dad's working on a 5.3 Datsun build. I think if we can get the accessory drive close enough to the engine to tuck behind the steering rack, we can move the engine back another 1"+

Right now it has the truck accessory drive, with an extended crank pulley that "straddles" the steering rack such that the belt is in front of the rack while the timing cover is behind it.

[This message has been edited by Will (edited 07-23-2013).]

fieroguru

JUL 23, 12:33 PM

Part # is ACDELCO OE SERVICE 12635650 Harmonic Balancer. Cheapest place shipped to you is Rock Bottom Auto Parts on ebay. Shipped is $138.78. I just ordered a new one as mine has a wobble on it and I am fighting a slight belt chirp. If you go with this balancer, then you will likely have to go with an electric water pump or use the LS4 one (if it fits).

Here are a few pictures: