[Sean]

I got our car on the dyno today (600 miles on it) and the dyno graph was very jagged at the bottom end.
I didn't see any knock sensors, but think it must have them and the dealer put in cheap fuel.
Any input would be appreciated.
The peak RWHP was 332 (Dynojet, car is bone stock).
Here's a picture of our coupe.
Regards,
Sean

 

[Andrew]

Sean,

Great looking car. Did they give you a disk with your dyno read outs? If so, can you post the photo on here, I'm sure we would all love to see that.

 

[Sean]

Hi Andrew,
Thanks for the compliment on the car (I'm glad I lowered it right away).
The dyno graph was very choppy.
The car was filled by the dealer and they msut have put in cheap gas as I just filled it last night (for the 1st time) with 93 octane.
The car ran A LOT better (stronger) today.
I'll get it back on the dyno and see how if it improved like it feels.
I plan on engine tuning and exhaust mods, but need a good baseline.
Once it looks proper, I'll post it.
Regards,
Sean

 

[Brad]

Sean,

Take a look at my dyno graph with *exactly* the same low-end jaggies. Look familiar? Did yours flatten out at 4100 RPM?

Here's mine: http://www.maseratiforum.net/forum/viewtopic.php?t=76&highlight=

 

[Sean]

Hi Brad,
Yes, mine was similar, but went to a higher RPM and was more choppy before flattening out.
I'll try and get it back on the dyno tonight.
I did notice that both yours and mine start way too lean.
There's more torque to be made by adding fuel on the low end, which should help with the detonation also.
Regards,
Sean

 

[Brad]

Hi Brad,
Yes, mine was similar, but went to a higher RPM

Higher than 7600 RPM?

 

[Sean]

Sorry, I meant the choppy part continued to a higher RPM, then it flattened out and pulled smooth to 7,600.

Regards,
Sean

 

[Brad]

Ah, now I see what you meant!

After having Maser upgrade the ECU, I lost a bit of power, but the choppiness was gone.

Installing the Tubi brought some of the power back, but not to the original highest point.