98 Formula - help with tune
Thread Starter
Joined: Jun 2002
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From: League City, Tx
98 Formula - help with tune I'm tuning a 98 Formula with a cat back and LS1 intake. When the car was brought to me, it had a 4* of KR at 3800 under WOT. The car was not tuned for the intake, and it had a de-screened MAF.
I've tuned it with the STFTs. The table seems close but way off from the stock LS1 intake table. I still have 4* from 3800 and up it seems. What am I missing/skipping?
the first two are the stock tune/log . . . and the second is the modded tune.
I've pulled 3* on the low table, and it now has a screened MAF.
EDIT: Car now has a LS6 intake, and not the stock LS1 intake.
I've tuned it with the STFTs. The table seems close but way off from the stock LS1 intake table. I still have 4* from 3800 and up it seems. What am I missing/skipping?
the first two are the stock tune/log . . . and the second is the modded tune.
I've pulled 3* on the low table, and it now has a screened MAF.
EDIT: Car now has a LS6 intake, and not the stock LS1 intake.
Last edited by Tootall; Mar 17, 2008 at 11:35 AM.
Thread Starter
Joined: Jun 2002
Posts: 5,076
Likes: 2
From: League City, Tx
we've already swapped that out for a screened MAF . . . it's in my first post at the end. Thanks for the suggestion, but is there anything else . . . does the VE table look ok ?
Thread Starter
Joined: Jun 2002
Posts: 5,076
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From: League City, Tx
You said "I'm tuning a 98 Formula with a cat back and LS1 intake" in your initial post.
As for KR 98's are infamous for throwing 4* of false knock retard, you could probably pull out 15* & it would still pull 4*.
Im sure there are threads on here about it.
As for KR 98's are infamous for throwing 4* of false knock retard, you could probably pull out 15* & it would still pull 4*.
Im sure there are threads on here about it.
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Thread Starter
Joined: Jun 2002
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From: League City, Tx
Hey I'm sorry about that, I'll edit the post above.
ok, thanks for the help, I'll keep searching.
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Darn for some reason I can not see the graphs above.
But as stated above, the intake is an LS6 intake with AIR/EGR removed. Although my KR has happened since I bought the formula nearly 6 months ago when it was completely bone stock down to the stock lid.
Also to note the KR only happens when it wants to, not all the time. As before when I had my old MAF it happened at every WOT run but now just from time to time with the screened MAF I replaced it with.
But as stated above, the intake is an LS6 intake with AIR/EGR removed. Although my KR has happened since I bought the formula nearly 6 months ago when it was completely bone stock down to the stock lid.
Also to note the KR only happens when it wants to, not all the time. As before when I had my old MAF it happened at every WOT run but now just from time to time with the screened MAF I replaced it with.
Thread Starter
Joined: Jun 2002
Posts: 5,076
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From: League City, Tx
anyone else? . . . I'd like to nail this down tomorrow. I'm really interested in tuning with the drivers side O2 sensor out, and have my WB there in place instead.
TTT.
So my options are:
1)Address PCV problems -98's are common to have faulty PCV?
2)Replace knock sensors and harness with newer units? -98 Problem, although I am hearing actual knock as well as some false knock.
Any other ideas? Thanks
So my options are:
1)Address PCV problems -98's are common to have faulty PCV?
2)Replace knock sensors and harness with newer units? -98 Problem, although I am hearing actual knock as well as some false knock.
Any other ideas? Thanks
I'm not sure about PCV. I've never heard that 98s in particular had any more problems than any other years with oil consumption through the PCV system.
I scrapped my entire PCV system capped it all off and installed a breather. Car runs much better since then
Thread Starter
Joined: Jun 2002
Posts: 5,076
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From: League City, Tx
I wanted to bring this up as to see if anyone else had any opinions. We will be replacing my knock sensors and harness this weekend and are hoping that this fixes the problems but since he is doing the tune, maybe someone has some other insight. He is going to set my VE tables back to stock and attempt to tune my MAF. Thanks
You can put it in open loop and pull one of the front factory O2 sensors for the wideband - that's the way I do it all the time. In open loop, the factory O2 sensors aren't doing anything anyway. After you completely tune the VE tables and then the MAF table in open loop with the wideband, put it back in closed loop, reinstall the factory O2, and check the LTFTs. If the LTFTs are way off, or one is higher than the other, you need to check for leaks, or you may have a worn out O2 sensor.
And yes, the 98s are bad about KR. You can tune on the knock sensor tables to desensitize them, but it is hard to know how much to do on them so you don't totally disable them... I usually make small changes and see when the false knock goes away. If the tune is on, and it is knocking, chances are really good it is false knock.
And yes, the 98s are bad about KR. You can tune on the knock sensor tables to desensitize them, but it is hard to know how much to do on them so you don't totally disable them... I usually make small changes and see when the false knock goes away. If the tune is on, and it is knocking, chances are really good it is false knock.
And yes, the 98s are bad about KR. You can tune on the knock sensor tables to desensitize them, but it is hard to know how much to do on them so you don't totally disable them... I usually make small changes and see when the false knock goes away. If the tune is on, and it is knocking, chances are really good it is false knock.