Possibly a dumb Predator question..

TMRs SRT8 · 11-05-2009, 01:37 PM

Apologize in advance if this should go in the SRT section.

What's the difference between the "performance" tune and the "CAI" tune with the 9r12 crom? Does the CAI tune add more fuel to compensate for more air?

Reason I ask is because I'm getting audible pinging with either the 91 or 93 performance tunes right at around 3k. Slightly less with the 91 tune but still there. Just loaded the 91 CAI tune, but due to where I live if I go take the car out, I won't have a spot for blocks so I didn't run it yet.

The car does run 93 as that's all I'll put in it. Exxon was the last fill up a few days ago on the way home from work. Car also has a catch can in it along with the stock thermostat (for now).

I haven't logged anything yet, either because I'm getting ready to head down to Atlanta for the SSHS event this weekend.

Just curious if the CAI tune with my stock air box will make any difference or not.

Thanks.

Mr. iNCREDIBLE · 11-05-2009, 01:42 PM

performance tunes where created using the stock air intake system

CAI tunes were created using several popular Cold Air Intake brands

the CAI tunes do add more fuel and retard timing different than the non CAI tunes..

TMRs SRT8 · 11-05-2009, 01:57 PM

That's kinda what I figured, but wasn't too sure. I'm used to the SCT XCALs. Thanks dude. Much appreciated.

Mr. iNCREDIBLE · 11-05-2009, 02:17 PM

have you data logged to see if you are getting Knock Retard? our cars are known for false knock issues, Esp if you have headers...

TMRs SRT8 · 11-05-2009, 04:04 PM

Nah, not yet. I'll do that once I get down to Georgia tomorrow. I've read about the knock retard on here before, but I'm actually hearing it when I hit the gas. I'll see what I get when I log it.

**stevesrt8** · 11-10-2009, 10:45 AM

Wait a minute... you should never hear audible pinging. Knock sensors pull the timing back way before that!

There's something else going on here.

TMRs SRT8 · 11-11-2009, 04:37 PM

I agree that you should never hear it, but I did. I unfortunately know that sound very well from having a super charged car prior to this. It eventually lifted a head. lol

Seems like I'm in the minority while searching here, Google, etc. for audible knock on these cars as there wasn't much info out there. I DO know there is a pool of oil in the back of the intake manifold, but I've added a catch can to help alleviate that part of things. Maybe the pooled up oil in the intake is still affecting things? No idea.

With the 91 CAI tune and stock air box, I heard no audible ping/knock/detonation at all on the 1700 mile round trip to Georgia. Took it down the track 6 times like that, too. Once I slapped on the K&N FIPK Monday night when I got back, the audible ping came back. I even went so far as to get gas out here by me instead of in NJ where it's cheaper (BP 93) and still heard it.

I added a ton of fuel on the 91 CAI tune, something like 3%, 14%, 14% (I have to verify for sure when I go to mess with it later) and I don't hear it any longer. I wound up taking out 1*, 2*, 2* in timing but data logging it I'm getting upwards of 7.0 ST KNK at around 5100 RPMS.

I'll probably get to the point that I'll just get a CMR tune to save me the hassle and time messing with it. This thread was mainly for my peace of mind that I wasn't going to blow a car up at the same event, 800 miles from home.....again

Thanks for the replies.

UK CHRYSLER 300C · 11-12-2009, 01:00 AM

It might be the fuel you're running,I run the 93cai tune on a stock motor(no cai,or anything),I datalogged it and sent it to Johan at Diablo and he returned it saying everything is fine,I've been running that tune for 2 years now with no problems

**DGatzby1** · 11-12-2009, 05:20 AM

I agree with Steve, something is going on that is unique to your car or the fuel. Sounds really unusual. I run the 91 oct/CAI tune with BP 93 octane gas with absolutely no problems this time of year. I have data logged it and it is nearly clean. Certainly nothing approaching 7 degrees of ST knock, and that is with no fuel added. Looks like we have the same equipment basically.

Does not sound like the same BP 93 octane we have here in the midwest, assuming your car is okay.

TMRs SRT8 · 11-13-2009, 06:19 AM

I'll be trying a local Mobil station after this tank runs out and we'll see what happens.

And this car better be ok....it's only got 15k on it. lol

Thanks for the replies, guys.

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