Maximizing Predator performance on an SRT-8

[DaveW68]

Originally Posted by 300C_Chris

Dave thanks for the info, are these changes to the performance tune or the cai performance tune?

Yeah i saw Hahn Racecraft, I thought i would like to know if someone has had a tune from them or maybe i'll just go check them out after the intake and exhaust mods.

Those were actually adjustments to the CAI tune. 91 is premium in CA, but I'm not sure if they baselined the 91 or 93 CAI tune. I think Brute said it was set to the 91 CAI tune & then adjusted. Either way, I did it to the 93 CAI tune and it absolutely rocks!

[MKILLER]

So Mike from Diablo admits that their programs in their unit will not work the same on all cars even it they are the same model.



Something I agree with and see everyone is over looking. This comes from Mike at Diablo regarding a question from Mike L.

Quote:
but what works for one car may not work for another.
To properly dial in the tune, you need to log and determine your own changes, rather than what worked for someone else.
__________________
Quote:
Don't let a great DA and a full hook up fool you. You'd be surprised what that combination can do with good power. DA is the most under estimated, most important (most over looked on forums) thing when it comes down to putting down good numbers for a specific bracket of car.

[Mike_Levy]

And I've been trying to get info from him on what to scan/log for a few days now, and haven't gotten a response.

On a positive note, pulling the advance in the 4-4.8k range eliminated the KR in my case.

[MKILLER]

Has anyone used Proscan or other software to adjust their Predator programming?

[immo]

Originally Posted by DaveW68

These changes produce more than 20 hp & 20 lb/ft of torque.

In the WOT Fuel adjustments, go 3% rich for all 3 rpm ranges.

In the WOT Spark adjustments, advance the spark +2 for the first 2 rpm ranges and +1 for the 5k-7k range.

.

So is this for 91, 93, or just a good rule regardless?

[DaveW68]

Originally Posted by immo

So is this for 91, 93, or just a good rule regardless?

It seems to work perfectly for either the 91 or 93 CAI tune for 2006 SRT-8's. It seems there may be some differences in the PCM programming for the 2007's where it may not be perfectly suited. That's why if you have a 2007 SRT-8, you may want to have it dyno tuned to get it dialed in.

[DaveW68]

Originally Posted by MKILLER

So Mike from Diablo admits that their programs in their unit will not work the same on all cars even it they are the same model.



Something I agree with and see everyone is over looking. This comes from Mike at Diablo regarding a question from Mike L.

Quote:
but what works for one car may not work for another.
To properly dial in the tune, you need to log and determine your own changes, rather than what worked for someone else.
__________________
Quote:
Don't let a great DA and a full hook up fool you. You'd be surprised what that combination can do with good power. DA is the most under estimated, most important (most over looked on forums) thing when it comes down to putting down good numbers for a specific bracket of car.

Here's the thing: If you are running an SRT-8 of the same year with the same PCM version and the same mods, then what works for one will work for the other if you are running the same type of gas (octane and ethanol mixture). The only other variable that I think could make a difference is how the tune reacts to the climate you drive in. Also, I don't buy into the argument that some on this forum have made about some SRT-8's being factory freaks. They all have the exact same internals. The only thing that can possibly make one factory engine faster than another (of the same year and PCM version) is the way the car was broken in and the amount of wear on the engine....or if the car was built with defective parts.

[EricG]

Also, I don't buy into the argument that some on this forum have made about some SRT-8's being factory freaks. They all have the exact same internals. The only thing that can possibly make one factory engine faster than another (of the same year and PCM version) is the way the car was broken in and the amount of wear on the engine....or if the car was built with defective parts.

I agree for the most part with that. I think in the last SRT engineer chat session that they see less that a 2% variance in power output with their engines....so maybe an 8-10 hp difference on the high end with most probably differing by only a few. Modern machining and such must yield consistent parts. I do think the break-in is important(although some people would say even that doesn't matter as much in new engines as it did with older ones), and people that over-rev their motors when all the way cold over and over again may see a faster wear out. But that's another thing with modern synthetic oils that may not matter much anymore like it used to.

Eric

[4herb2tas0tik]

Originally Posted by EricG

so maybe an 8-10 hp difference on the high end
Eric

man you know how much i paid for a extra 10hp...
why couldnt i have gotten a factory freak with the extra hp...

[300C_Chris]

Originally Posted by EricG

I agree for the most part with that. I think in the last SRT engineer chat session that they see less that a 2% variance in power output with their engines....so maybe an 8-10 hp difference on the high end with most probably differing by only a few. Modern machining and such must yield consistent parts. I do think the break-in is important(although some people would say even that doesn't matter as much in new engines as it did with older ones), and people that over-rev their motors when all the way cold over and over again may see a faster wear out. But that's another thing with modern synthetic oils that may not matter much anymore like it used to.

Eric

I'm a toolroom machinist with 30 yrs in the aircraft industry, there is more deviation in modern machining than you would think, one or two ten thousands of an inch does make a difference and there is also differences in material type and hardness, then there is differences in the actual finish on the machined surfaces. Bottom line is you can take parts run at the same time and custom match the parts to get a better assembled unit, And sometimes that does happen by accident and you get something that does run better.