AFM delete kit - need help

[CorvetteC6]

Dear All ! Could you please be so kind and help me to choose only minimal options to get rid of the AFM?

I would delete AFM but save the VVT. I mean minimal changes in ECM.

In my view it's needed just to change the LS3 camshaft, replace all lifters to the LS3 (12698945), change VLOM and disable AFM from the ECM. Valve springs could be kept and pushrods' lengths could be saved as is.

Please correct me if these 4 options are not enough to delete AFM.


In addition,

- Do I need install just stock LS3 camshaft GM 12623063 or GPI LS3 LS SS1 cam is the same hardware and much more preferable ? Or in case of GPI more ECM tune is required ?

[Moto-Mojo]

I'm no expert but I do hang here. By far the easiest way to delete AFM is with a simple tune. This would fit the 'minimal' bill. Changing a camshaft is not, in and of itself, necessary to delete AFM. Certainly if you were wanting a bigger cam then yes, AFM lifters should go and all the supporting mods needs to to be seriously considered - push rods, proper lifters, appropriate valve springs for the new cam, possibly trunnions, etc.

Someone can correct me if I'm too far off here.

[1JEWLDSSRS]

Yes. The minimal way to do it is to just tune out the AFM program which disables the AFM in the ECM. But then you will still have those crappy AFM lifters in there. Suggest you swap out the AFM lifters for the GM Performance ones, then tune the AFM out in the ECM. By far the cheapest and minimal work needed. No cam change is needed, unless you want more power from a bigger cam. Just my .02.

[acutron42]

Right on Moto, It can be as easy as a quick flash of the ecm to shut off the dod right down to a complete system delete. It all depends on what you want to spend. Most will say get rid of the dod/afm completely but is it necessary, no but there is risk of failure.

[TheFlyingBananaSS]

I did this exact thing. Lots of options to do this depending on your goals. I suggest contacting Andrew Cammer at GPI. He helped me with my build. A wealth of knowledge.

[1JEWLDSSRS]

Originally Posted by TheFlyingBananaSS

I did this exact thing. Lots of options to do this depending on your goals. I suggest contacting Andrew Cammer at GPI. He helped me with my build. A wealth of knowledge.

Totally agreed here. He can get you squared away.. Good place to start.

[morepowerjoe]

Originally Posted by CorvetteC6

Dear All ! Could you please be so kind and help me to choose only minimal options to get rid of the AFM?

I would delete AFM but save the VVT. I mean minimal changes in ECM.

In my view it's needed just to change the LS3 camshaft, replace all lifters to the LS3 (12698945), change VLOM and disable AFM from the ECM. Valve springs could be kept and pushrods' lengths could be saved as is.

Please correct me if these 4 options are not enough to delete AFM.


In addition,

- Do I need install just stock LS3 camshaft GM 12623063 or GPI LS3 LS SS1 cam is the same hardware and much more preferable ? Or in case of GPI more ECM tune is required ?

First off, your engine is a l99 not a ls3. So if you want to do a ls3 swap you'll lose your vvt but if you want to keep your vvt then it's a little bit more involved. There's vvt cams out there (GPI is the best) that you can buy that will require a timing lock out block that will need to be installed in the cam phaser that will limit your timing swing but you will still enjoy the benefits of vvt. Personally knowing what I know now I wouldn't keep the vvt just because of the fact that the ls3 conversion is so much simpler then the vvt stuff and it's a lot more tuner friendly. But that being said either way you can do a remote tune with GPI that will get you going. As far as parts go you can get it all in a kit from GPI or you can contact Andrew Cammer at GPI and he will put together a cart for you to purchase online.
https://gwatneyperformance.com/about

[CorvetteC6]

Originally Posted by 1JEWLDSSRS

Yes. The minimal way to do it is to just tune out the AFM program which disables the AFM in the ECM. But then you will still have those crappy AFM lifters in there. Suggest you swap out the AFM lifters for the GM Performance ones, then tune the AFM out in the ECM. By far the cheapest and minimal work needed. No cam change is needed, unless you want more power from a bigger cam. Just my .02.

Thank you for the detailed reply.

So, just to confirm. I just turn off AFM from ECM and replace AFM lifters to the GM Performance ones.

1) Could you please advise a part number of the GM Performance lifters ? Do you mean 12698945 (stock LS7 lifters) ?

2) Do I need to install LS3-type VLOM or install plugs on the oil lines under VLOM ?

Thanks in advance

[CorvetteC6]

Originally Posted by acutron42

Right on Moto, It can be as easy as a quick flash of the ecm to shut off the dod right down to a complete system delete. It all depends on what you want to spend. Most will say get rid of the dod/afm completely but is it necessary, no but there is risk of failure.

I use Range OBD Device. First 6 moths it was fine. But now I have rpm float (+/- 100 rpm) in AFM mode and sometimes vibrations coming somewhere from the engine when Range Device is enabled...
Did you left the stock AFM lifters 12698946 or replaced them ?

[TheFlyingBananaSS]

Short cuts lead to failure. Contact GPI. They have a complete AFM delete kit that handles this issue and it's a lot safer. Too many have tried short cuts only to drop a valve and a rebuild.

Personally, I'm not a gambler with high performance.

[CorvetteC6]

Originally Posted by morepowerjoe

First off, your engine is a l99 not a ls3. So if you want to do a ls3 swap you'll lose your vvt but if you want to keep your vvt then it's a little bit more involved. There's vvt cams out there (GPI is the best) that you can buy that will require a timing lock out block that will need to be installed in the cam phaser that will limit your timing swing but you will still enjoy the benefits of vvt. Personally knowing what I know now I wouldn't keep the vvt just because of the fact that the ls3 conversion is so much simpler then the vvt stuff and it's a lot more tuner friendly. But that being said either way you can do a remote tune with GPI that will get you going. As far as parts go you can get it all in a kit from GPI or you can contact Andrew Cammer at GPI and he will put together a cart for you to purchase online.
https://gwatneyperformance.com/about

Thank you ! I decided just to disable the AFM and leave my cam. I replaced recently VVT (because it maked trrrrrrr sound on could during first 5-10 minutes of driving. After replacement to the GM OEM part it makes it again... LOL ) and would to save it.

I am not a racer and the best option as mentioned above would be to replace the AFM lifters with GM Performance (if I can find their part number) and disable the AFM from the ECM.

Do I need to install LS3-type VLOM or install plugs on the oil lines under VLOM if I disable AFM from ECM and leave L99 cam?

[CorvetteC6]

Originally Posted by TheFlyingBananaSS

Short cuts lead to failure. Contact GPI. They have a complete AFM delete kit that handles this issue and it's a lot safer. Too many have tried short cuts only to drop a valve and a rebuild.

Personally, I'm not a gambler with high performance.

I would save the VVT, but all kits include LS3 sprocket instead it. I live in Swiss and here are quite serious requirements when inspectors are checking cars

[1JEWLDSSRS]

Originally Posted by CorvetteC6

Thank you for the detailed reply.

So, just to confirm. I just turn off AFM from ECM and replace AFM lifters to the GM Performance ones.

1) Could you please advise a part number of the GM Performance lifters ? Do you mean 12698945 (stock LS7 lifters) ?

2) Do I need to install LS3-type VLOM or install plugs on the oil lines under VLOM ?

Thanks in advance

These are the lifters I run. The ones you were posting are the racing "caddie" lifters, and you don't need them unless you are running upwards of 8000 rpm! And yes, you could just tune out the AFM in the ECU and leave everything else be, I did that for 7 years, and no problems. And I can't tell you how many times I hit the rev limiter while shifting in manual mode! Been lucky, but yea it can be done. But I do suggest, if you want to do it right, do the LS3 conversion and be good from there. This way ALL the AFM/DOD garbage is gone! And when it comes to tuning it with an aftermarket LS3 can, it will be more tuner "friendly". But before you do anything, I would contact "acammer" at GPI, he is our LS/L99 master guy!! Good luck.

https://briantooleyracing.com/chevro...2499225-1.html

[morepowerjoe]

Yeah if I was you I would check into the cam swap a little more if you do decide to do it because I know they are strict on the emissions stuff there. They could even fail you with a tune change.