HELP :: Diablo Adjustable Parameters

[Spider]

Hi everyone, I have just installed my diablo two days ago after updating it through diablosports.com and my current version is v.8r20 and so far everything was fine, till I decided to play around with the parameters

First I've chosen the Diablo Performance Tune with CAI (I have Volant CAI) and modified its parameters, raised the rev. limiter in neutral to 5000rpm and disabled the auto shift and installed the Tune... then I drove the car, with the manual shift on 1st I hit it and when the rpm reached around 6000rpm the computer shut down and the check engine icon start flashing!!! I had to stop on the side of the road and had to re-start the car and everything was fine except the check engine icon ...

So I cleared the error and reset the parameters but the car did the same thing again, so I manually changed the parameters to where they were (stock auto shift and 4000rpm on neutral) but I started to hear a loud noise from my exhaust! my brother said it might be because of the extra power I have which my stock exhaust can't handle ...

To find out the source of the problem I restored the original backup and the car is back to stock, and the loud noise is no longer there !!! so is't true ? my exhaust can't handle the extra power ???

I need your help with these issues guys ... I'm getting a MagnaFlow pretty soon and I'm planning to disable the MDS but not sure what are the implications of disabling the MDS! any idea?

And what should be the safe rpm rev limit while driving the car? 5500rpm !!

[Midnightsun300c]

Originally Posted by Spider

Hi everyone, I have just installed my diablo two days ago after updating it through diablosports.com and my current version is v.8r20 and so far everything was fine, till I decided to play around with the parameters

First I've chosen the Diablo Performance Tune with CAI (I have Volant CAI) and modified its parameters, raised the rev. limiter in neutral to 5000rpm and disabled the auto shift and installed the Tune... then I drove the car, with the manual shift on 1st I hit it and when the rpm reached around 6000rpm the computer shut down and the check engine icon start flashing!!! I had to stop on the side of the road and had to re-start the car and everything was fine except the check engine icon ...

So I cleared the error and reset the parameters but the car did the same thing again, so I manually changed the parameters to where they were (stock auto shift and 4000rpm on neutral) but I started to hear a loud noise from my exhaust! my brother said it might be because of the extra power I have which my stock exhaust can't handle ...

To find out the source of the problem I restored the original backup and the car is back to stock, and the loud noise is no longer there !!! so is't true ? my exhaust can't handle the extra power ???

I need your help with these issues guys ... I'm getting a MagnaFlow pretty soon and I'm planning to disable the MDS but not sure what are the implications of disabling the MDS! any idea?

And what should be the safe rpm rev limit while driving the car? 5500rpm !!

I haven't run the newest revision however from the information that you've posted the new tune may not be the culprit. The rev limit in drive needs to be raised along with the auto shift disable to shift manually above the stock limit. Try raising the rev limit to 7000 rpm in drive and see what happens. Your exhaust is not the problem. having a stock exhaust may rob you of a little horsepower(5-10) but it will not cause the PCM to go into limp mode. Bumping off the rev limit will always induce limp mode and a key cycle is the cure. MDS is not the problem either, disabling it will help drone but affect little else except good gas mileage.

[Spider]

Midnightsun, that really makes sense especially that the car PCM goes into limp mode when I go over the 5500rpm But is there any risk raising the rpm to 7000 ?

Am also curious about the noise I hear when when I applied the CAI performance Tune ... the only performance mod I currently have is the CAI so do you suggest using the 93Octone Performance Tune or should I use the CAI Tune ?

Regarding the MDS I think am going to get the Corsa (I just got a good deal) so that shouldn't be an issue anymore

[Midnightsun300c]

Originally Posted by Spider

Midnightsun, that really makes sense especially that the car PCM goes into limp mode when I go over the 5500rpm But is there any risk raising the rpm to 7000 ?

Am also curious about the noise I hear when when I applied the CAI performance Tune ... the only performance mod I currently have is the CAI so do you suggest using the 93Octone Performance Tune or should I use the CAI Tune ?

Regarding the MDS I think am going to get the Corsa (I just got a good deal) so that shouldn't be an issue anymore

KR is the key to a safe tune. There may be a false KN on our engines, especially with a "tall" cam, but regardless if you monitor and stay below the KN threshold you should be safe. As a general rule, the worst knock will happen at peak torque, which is down in the 4-5K rpm range so higher rpms will generally not be a knock sensitive area. I am thankful to your query to the to 7k, which is not a suggestion to where you should manually shift but a suggestion to raise the limp mode enable threshold beyond where you would be shifting. Prudence should dictate that a stock 5.7 should not venture far beyond the 6.2K limit. A balanced rotating assembly or upgraded harmonic balancer will raise that limit.

The intent of my suggestion is to alert you to the fact that it takes two adjustments in the Predator to actuate the higher shift points above stock...the raised shift rev limit in drive and the disabling of the auto shift feature.

In regards to the "noise", you have a finely tuned ear if you can hear knock in our engines as it is a deceptive sound that most cannot hear. If you can in fact hear detonation you are of a select group and should consider an appropriate profession in music or acoustics! That is nothing more than a sincere a compliment!

If you have a CAI then use the appropriate CAI tune correspondent to your octane rated gas. If you are using 91 octane gas use the 91 octane CAI tune.

In regards to the Corsa, I think that they have applied the requisite science to their R&D and consequently have produced a product that gives what is advertised. I think that you will be very happy with your choice if the elimination of drone and quited idle is your goal.

IMHO the Predator is an amazing product and a quantum leap forward for our DCX platform engines. It gives us the power, but it is up to us to use it wisely.

[Spider]

Thanks for compliment

Anyway I will take your advice on the relation of the autoshift and the higher rev. limit ... I will test it and post back the results - although I don't want to harm the engine

[UK CHRYSLER 300C]

I run my 5.7 to 6700 rpm and installed it last december,no problems with my motor,it will be fine

[Spider]

Originally Posted by UK CHRYSLER 300C

I run my 5.7 to 6700 rpm and installed it last december,no problems with my motor,it will be fine

Are you the running the CAI performance tune?

[Midnightsun300c]

Originally Posted by UK CHRYSLER 300C

I run my 5.7 to 6700 rpm and installed it last december,no problems with my motor,it will be fine

A couple quick questions:
Is the 6700 attainable with autoshift or just manual?
How often have you reached 6,700 rpm?

The reason for my question is that the only way I can reach those rpms is with the auto shift disabled with my AWD. Also, the stock harmonic balancer and crank of the 5.7 is not rated above 6200 rpm. It may perform well above that rpm limit a few times but it may not last long if you persist. When I had my crank balanced (6.1 replacement) there was a fair amount of drilling and weighting even with it, and it is rated to 6,600! Maybe more a word of caution than a question.

[UK CHRYSLER 300C]

I am running 93 cai tune,the 6700 rpm shifts in auto and manual,I reach 6700 rpm quite a lot especially in 2nd gear,it gets to 80 in 2nd then bang into 3rd and just keeps pulling.I dont get much chance to pull 6700 in 3rd as I tend to run out of road cos I'm already doing 80 in 2nd.Obviously if I dont want to pull 6700 rpms I shut off and let the tranny do its thing.
I'm running v18,I tried v20,it was crap,so I went back to v18,so you may have different speeds with v20 as I had tranny issues with v20

[kymag]

Originally Posted by Midnightsun300c

KR is the key to a safe tune. There may be a false KN on our engines, especially with a "tall" cam, but regardless if you monitor and stay below the KN threshold you should be safe. As a general rule, the worst knock will happen at peak torque, which is down in the 4-5K rpm range so higher rpms will generally not be a knock sensitive area. I am thankful to your query to the to 7k, which is not a suggestion to where you should manually shift but a suggestion to raise the limp mode enable threshold beyond where you would be shifting. Prudence should dictate that a stock 5.7 should not venture far beyond the 6.2K limit. A balanced rotating assembly or upgraded harmonic balancer will raise that limit.

The intent of my suggestion is to alert you to the fact that it takes two adjustments in the Predator to actuate the higher shift points above stock...the raised shift rev limit in drive and the disabling of the auto shift feature.

In regards to the "noise", you have a finely tuned ear if you can hear knock in our engines as it is a deceptive sound that most cannot hear. If you can in fact hear detonation you are of a select group and should consider an appropriate profession in music or acoustics! That is nothing more than a sincere a compliment!

If you have a CAI then use the appropriate CAI tune correspondent to your octane rated gas. If you are using 91 octane gas use the 91 octane CAI tune.

In regards to the Corsa, I think that they have applied the requisite science to their R&D and consequently have produced a product that gives what is advertised. I think that you will be very happy with your choice if the elimination of drone and quited idle is your goal.

IMHO the Predator is an amazing product and a quantum leap forward for our DCX platform engines. It gives us the power, but it is up to us to use it wisely.

I have a question. Are you saying that raised shift points will not work unless you disable auto upshift? I thought that all you had to do was raise shift points and raise the rev limiter in drive to get the raised shift points to work. I hope I just learned something here. The car will have raised shift points in D also or just in autostick? Thanks