American Racing Headers and Lund tune

[superman07]

I won't waste my time with Lunds Ff tune. I'm probably going to just have Watson tune it and not waste anymore time on the email tunes. To much bs.

have you been back to Watson lately?

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[superman07]

What kind of flex fuel tune issues are you having?

I still believe a lot of the issues are with AFR's and the deductive logic for determining Alc percentage, and the effects of AF ratio change dorking with short and long term fuel trims. Add in the CAI and exhaust changes in his car and Its probably even more volatile.

I have seen to much weird behavior when this car learns the fuel if it isn't driven to a real empty tank. I have had it lock into a percentage in under 2 minutes, there wasn't possibly time for the fuel to disperse, normalize, and run enough through the engine to be optimal. I have not found a way to force a reset to trigger a re-learn.

I have been driving down the interstate, with the car running awesome, just to pull over and need fuel, fill up with e85. Then noticed after the re-learn it felt sluggish.

 

[Johnb-5.0]

John, do you feel the torque improvements? My car is stock, so there isn't nearly as many variables. Incidentally, my car hated the lund tune and the Lethal off road pipes, killed torque. Car felt like I added 800 pounds. had to take the pipes off, which was fine as it was way to loud for me.

what are some of the most severe issues?

What has Lund been able to do so far? Sending in WOT data logs doesn't seem to really smooth out drive-ability issues. I think Lund sold his car.

Are you going to find a shop and just get a "custom" tune?

The first Lund FF tune, the car ran great, no issues until the check engine light with codes p0430 and p0420. After the tune update, that's was when the hesitation and popping started on hard acceleration. Nothing else on the car was changed no fuel added and ACL remained at 69%. After sending numerous data logs another tune was sent with no improvements. Lund thinks the o2 exstension cables could be bad, I'm not sure on that one. Sometime in next few days I plan to reinstall the first FF tune and see how it runs.

 

[65sohc]

Have you done before and after dyno pulls with the stock vs Lund tune?

No reason to. It is worth it to me just knowing I'm not handicapped by 91 octane. I have no interest in running race fuel, especially when e85 is convenient, at least as good, and a fraction of the price.

 

[Voodooo]

No reason to. It is worth it to me just knowing I'm not handicapped by 91 octane. I have no interest in running race fuel, especially when e85 is convenient, at least as good, and a fraction of the price.

I'm not disagreeing with you, but it's not worth the hassle to run E85 for me.

 

[65sohc]

The first Lund FF tune, the car ran great, no issues until the check engine light with codes p0430 and p0420. After the tune update, that's was when the hesitation and popping started on hard acceleration. Nothing else on the car was changed no fuel added and ACL remained at 69%. After sending numerous data logs another tune was sent with no improvements. Lund thinks the o2 exstension cables could be bad, I'm not sure on that one. Sometime in next few days I plan to reinstall the first FF tune and see how it runs.

I didn't know what those codes were so I looked them up. Malfunctioning cat, or at least cat-related. One way to troubleshoot would be to write you a catless tune with rear O2 sensors off.

 

[Johnb-5.0]

I didn't know what those codes were so I looked them up. Malfunctioning cat, or at least cat-related. One way to troubleshoot would be to write you a catless tune with rear O2 sensors off.

You are correct, the first Lund 93 tunes I received they were turned off like I requested. Some how that didn't get done when I ordered the FF tunes.

 

[65sohc]

What are "N/cats"?

 

[Johnb-5.0]

What are "N/cats"?

Guess I should edit that No cats. lol

 

[oregongt350]

N/cats

What are "N/cats"?

:lol::lol::lol::lol:

N/cats are a breed of cats that live on freeways and expressways. They are extremely difficult to catch and have been known to make hi pitched sounds sometimes mixed with load thunderous roars when least expected. Do not approach without using extreme caution and a full checkbook

 

[65sohc]

I figured that was the case but since your error codes are cat-related I thought maybe I was missing something. All the more reason to suspect that Lund may be right as far as your O2 sensor extension cables. If the tune works on Lund's own car it should work on anyone's.

 

[superman07]

e85 was 1.79 this morning.

 

[Derek@Lethal]

I didn't know what those codes were so I looked them up. Malfunctioning cat, or at least cat-related. One way to troubleshoot would be to write you a catless tune with rear O2 sensors off.

Those codes are related to the front O2 sensors. I believe he does not have cats, so if those codes are coming up, it's most likely either a bad sensor or a bad extension harness which is giving a false malfunction.

Don't run extensions on these cars. There is enough slack in the stock harness to connect directly to the sensor just by releasing the body side of the harness from it's clip on the top of the transmission bell housing.

 

[superman07]

I would be very careful driving this car with the potential of a bad o2 sensor reading, knowing how screwed up it was with E-blends and just a vacuum leak, man, the deductive refueling logic and inference strategy depends on the O2's to get you the right percentages, and ultimately AFR I assume.

Before I had figured out what had happened I put large amounts of 93 in the tank just to see the Alc percentage stay roughly the same. Freaked me out, and ultimately led me to identify my clean side separator was in 2 pieces.

 

[superman07]

I figured that was the case but since your error codes are cat-related I thought maybe I was missing something. All the more reason to suspect that Lund may be right as far as your O2 sensor extension cables. If the tune works on Lund's own car it should work on anyone's.

To be fair Lund never had the same modifications, and we have at least one report of Voodoos car running lean on the generic tune before fuel was added to accommodate the ARH tubes.

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