Review the PL snapshot??

[TR Custom Parts]

Just a quick on a roll run up to 94 mph. Do things look OK, see some KR at the end where I lifted so hopefully false knock. LC1 wideband, alkycontrol kit, etc Any suggestions?

 

[VIN7]

Mark,

Not that familiar with the TT 6.0 but I've been reading up on it because I'm thinking about trying it out...

1-2 wot fuel looks like it is adding too much you can see where the correction factor goes to +19% fuel and your a/f drops below 10. If you trace 'blm' you can see the ecm add fuel to 153 which is when you hit your 10.8 target and stops adding fuel but the a/f continues to drop. So there may be some lag time in this arrangement. This may be because it is a rolling wot rather than a stage and go...again this is where I'm not familiar with the characteristics of the chip. Maybe set 1-2 a/f higher than 10.8 so that when the real load hits in 3rd you won't have that big rich dip.

3-4 wot fuel looks like it is able to recover to your target and maintains with minimal correction.

Trans shifts way low on the 2-3.

On a side note, I have an LC-1 and my a/f trace is jagged compared to yours. Did you add an analog ground from your LC-1 to the powerlogger analog block?

Thanks,
Mike

 

[TurboBob]

Mark,

Not that familiar with the TT 6.0 but I've been reading up on it because I'm thinking about trying it out...

1-2 wot fuel looks like it is adding too much you can see where the correction factor goes to +19% fuel and your a/f drops below 10. If you trace 'blm' you can see the ecm add fuel to 153 which is when you hit your 10.8 target and stops adding fuel but the a/f continues to drop. So there may be some lag time in this arrangement. This may be because it is a rolling wot rather than a stage and go...again this is where I'm not familiar with the characteristics of the chip. Maybe set 1-2 a/f higher than 10.8 so that when the real load hits in 3rd you won't have that big rich dip.

3-4 wot fuel looks like it is able to recover to your target and maintains with minimal correction.

Trans shifts way low on the 2-3.

On a side note, I have an LC-1 and my a/f trace is jagged compared to yours. Did you add an analog ground from your LC-1 to the powerlogger analog block?

Thanks,
Mike

where is your LC-1 grounded? (all of the ground wires)

 

[TR Custom Parts]

To answer VIN7, didn't add any extra grounds other than those required. I have the smoothing on, maybe you don't. Yeah, notice the BLM's going up, time to start messing around with it.

 

[VIN7]

Bob,

All LC-1 grounds are soldered at the ecm connector. (Check the post I sent you on full throttle tech if you have time).

Mark,

I may try smoothing, but it could be the way the TT sends fueling corrections versus how my extender (no wb correction) is reacting to my maf signal.

Also, your 2 gear dip could be from the alky hit.

Mike

 

[Eric Stage I]

The correction is having to add too much fuel when the boost first comes up. Notice the how high the injector pulsewidth gets, but the a/f does not get richer. I would check two things: fuel pressure is rising at the same rate as boost, and that the alky is coming in fast enough. Whatever it is that is responding slowly catches up later and the correction has to pull it all back out.

 

[TR Custom Parts]

The correction is having to add too much fuel when the boost first comes up. Notice the how high the injector pulsewidth gets, but the a/f does not get richer. I would check two things: fuel pressure is rising at the same rate as boost, and that the alky is coming in fast enough. Whatever it is that is responding slowly catches up later and the correction has to pull it all back out.

I've got the alky pump mounted out back since I have the Metco spare tire tank. Using the check valve Julio supplied me with when I did the conversion from having the pump up front. Alky pump is working as the logging and mech gauge shows. Looks like the gas fuel pump is putting out a max of around 62 lbs. Fuel pressure is set at 45 with line off. Have the gas fuel pressure logging too so that will be on the data. What do you think? I know it is supposed to go up 1 lb for every lb of boost but is that to the 45 with the line off OR the reading you get with the vacuum line back on the regulator???

 

[VIN7]

Mark it should be 1:1 to the reading vac line OFF!

Mike

 

[TR Custom Parts]

Looks like maybe pump time. Pump I have is the one Kirban used to sell YEARS ago. Put it in in 1996 right after buying the car. Looks like it isn't keeping up. Will try a new filter first.

 

[VIN7]

I think you got your money's worth out of that one :biggrin: That's probably a walbro 307.

I've had good luck with my Red's XP Plus.

Mike

 

[TR Custom Parts]

It may be old but only has about 24,000 miles on it. With all the Walbro issues lately not real enthusiastic about putting a new one in. Might try the Denso one.

 

[GNBRETT]

Mark when are u gonna bring that thing down to Otto's? Im sure he could help diagnos ur issues and get you better tuned on the dyno at the same time. That thing should make some really good power at 25 psi.

It must spool wicked fast with the PTC. Plus, I wanna see those rims in person.

 

[TR Custom Parts]

Yeah, got to make it down there. Never seem to have the extra $$$$ lately.

 

[Quiky One]

It may be old but only has about 24,000 miles on it. With all the Walbro issues lately not real enthusiastic about putting a new one in. Might try the Denso one.

The Walbro's are now fixed, but I do understand your hesitation!

Jason

 

[TR Custom Parts]

Well, new 340 in a new tank and the fuel pressure is the same. 62 lbs at 22 lbs of boost. 45 psi line off at idle so shouldn't I be seeing 67 lbs of fuel pressure???? My latest logs shows the same thing, BLM's climbing to about 150 for a second or two. Next step???? New hot wire setup installed at the same time. voltage on powerlogger was showing around 13 volts, going to measure the voltage back at the pump when I get a chance.

 

[Quiky One]

Bad AFPR that no longer rises 1:1.

Jason

 

[TurboBuRick]

Mark, I use a small air regulator to simulate boost on the fp regulator. When I test I run the fuel pressure all the way to 100psi. That tells me if the pump and regulator are up for the task.

HTH

 

[Eric Stage I]

You said you were logging alky pressure. Is the pressure up by the time max boost hits?

Eric

 

[TR Custom Parts]

Screenshots below. First one is a from a run a couple of weeks ago with the alky logging.

Unfortunately, the logging of the alky stopped working when I went out for a quick run today. The two last screenshots are from today. I increased the initial setting on the alky to about the 1 oclock position but still getting that BLM spike at first. Verfied that the alky is working since my hood mounted gauge is working. Got to figure out the logging problem now too! Wonder if the transducer is shot. Just getting a solid 0 across the graph, would think if the connections are bad it wouldn't have ANY line on the graph, right????

Disappointed that the fuel pump change didn't help, will be switching out the Kirban regulator to see if that makes any difference. No leaks at the vaccum line for the reg either. The run today, didn't even hit a solid 60 lbs.