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Discussion Starter #1
Hi Everyone,
Just wanted to share that I've made some pretty big changes in the way my '04 Coupe runs.
I did a bunch of testing right after I bought the car and found that the ignition timing and air / fuel ratio were far from optimum.
The engine ran leaner than it should for maximum torque at low RPM loads and too rich at the upper RPM.
The timing was very low through most of the wide open throttle pulls.
I have a pretty well equipped business that develops and modifies parts for the Dodge SRT cars and Vipers.
Fortunately, that makes it pretty easy for me to modify my own cars as well.
Anyway, I've been tuning the Maserati this last week and have pretty much made the car an animal. My wife and guys at the shop couldn't believe how different the car felt, even though the power on the dyno only went up by 17 RWHP.
Right now the car is all stock with no rear mufflers (made replacement tips for it) and engine tuning. Its best pull recently was 345 RWHP and 302 RWTQ. That's nice, but the car changed a lot in how the power comes on as you roll into the throttle. It makes much more torque now and pulls really hard. Now it runs and sounds like the Maserati I envisioned it would be.
Pretty much what other people have felt with flash tunes by Eurotech and Powerchip are what I experienced as well. The big difference, mine's about 1/4 the cost. :D
I will post dyno results soon.
I want to drive with the tune another week or so and get it back on the dyno with the new S&B air filter when it arrives.
Regards,
Sean

PS.
Just so you know I'm not full of BS, here's my company website: www.roeracing.com
I built that business out of my passion for making the cars I drive better and offering the products at reasonable prices.
If I offer some of the mods I've made to my car, we'll become a paying advertiser on this site as well.
 

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Sean, you have made several new best friends.....

I cannot contain how interested I am....

Are you mods done with the ECU?

What is your address to send mine overnight? :D
 

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I'd be interested as well. I agree, 390hp out of this engine is pretty anemic, it needs a dose of Viagra.
 

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STARDOC said:
I'd be interested as well. I agree, 390hp out of this engine is pretty anemic, it needs a dose of Viagra.
That dose is from Eurotech. Upgrade the ECU, it makes this car wicked IMO.

Christian
 

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Discussion Starter #5
It was surprising to me how much the car drivability changed with tuning.
Normally, you expect to feel a difference at full throttle only.

I considered the options from the two main companies offering custom tuning, but their price point wasn't right for me. If the reflash were $500, I would have done it without a second thought.

I took a different approach for the tuning. First, I began with dyno testing and linking into the stock ECU to log what the factory programmed it to do for fuel and timing. Realizing that I could improve the tune and make my car better (read “more fun to drive”), I looked at the tools I had at my disposal to get the job done.

You realistically have three options to change the tuning.
1. Reflash / replace the prom.
2. Utilize an in series engine controller that fires the injectors and controls ignition advance, leaving the stock control module to run everything else.
3. Alter the key inputs used by the stock ECU in order to alter the timing and fuel curves, like a piggyback controller.
The easy and fast one is always #3, but it only works if what you’re tuning isn’t too far from ideal. If you have to change inputs too much, you’ll get check engine lights.

So, I did a wire pin out on my car to find all the sensor inputs to the ECU (good luck finding a wiring diagram anywhere) and started altering inputs from the stock sensors to the ECU, watching how it changed injector duty cycle and timing. Fortunately, I was able to change the fuel and timing to much better settings by altering as few as two key sensor signals. I wrote up some maps, altering the voltage settings based on RPM and engine load, and then proceeded to start dyno testing. I did about 25 dyno tests over two nights, followed by several drive tests over the next few days. Wide-open throttle tuning is relatively easy and drivability always takes a little longer. I've got it pretty well dialed in now and am quite happy with the way it drives. My Viper has 600 ft / lbs of torque at the rear wheels at 1,800 RPM, so I'm used to some big power.

The only thing I have left to do is add a switch so I can have a stock setting or performance setting option. With the performance tune, my gas mileage dropped 3 MPG and I want to have the option to turn it back to stock without having to link up to my controller with a serial cable.

I did not set out to make a Maserati product, but making improvements on cars like this is what I do, and I enjoy it. When it's all done, as long as I'm 110% satisfied and happy with it, I'll offer it to a couple people here to try, at no risk. Installation will probably take 45 minutes depending on what I do for a switch circuit and hidden switch mounting location, though the switch will not be a necessity.

If money is of no concern, go with a Eurotech or Powerchip tune. The cars are definitely more fun to drive when they have more power. We’re lucky that it’s this easy to increase the power (just tuning, no major modifications).

If anyone is in the Jacksonville Florida area and wants to go for a ride in my car, let me know.

Regards,
Sean
 

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It sounds like you really know your stuff.
I would be very interested in doing this to my coupe.
I agree that Eurotec seems pricey.

Tony
 

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Discussion Starter #7
"The only thing I have left to do is add a switch so I can have a stock setting or performance setting option. With the performance tune, my gas mileage dropped 3 MPG"

Disregard that comment.
Only my stop and go average fuel economy is down.
On the way into the shop this morning I rest the trip computer.
Driving 9 miles in a 55 MPH zone with only 2 stoplights, the average speed was 52 MPH with a fuel economy of 24.7 MPG.
I can live with the decrease in stop and go gas mileage as long as my cruise fuel economy is still good. So I won't be adding a switch.

Below are two pictures.
One is of the control box (I put it in the compartment with the relays and fuses under the passenger footrest). The controller is the small black potted box with white serial port connector. Since it's potted, it could go in the engine compartment also.
The second picture is the car on the dyno. One laptop is linked to the controller, one laptop is linked to the stock ECU and the desktop is running the dyno.

Regards,
Sean
 

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Sean,

Please keep us updated.

Thank you,
Kevin
 

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Sean,

Fancy seeing you here! With any luck, I should be picking up a Mas within the next couple of weeks.

[I know this is an old post].

Recoil
 

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I would be really interested in seeing your dyno sheet with A/F ratio before and after.
Brand dyno did you use?
Are your results below SAE??

Robb
 

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I am also interested.

I have a GS would you have the same ecu as mine or would it be a little different let me know thne we certainly can talk
 

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Hey Guys... FYI, the originator of this thread ( which is very old ) has long since sold his Maserati and scraped this project. For now EuroTech, PowerChips, LeoNardo and others are your best choice although some new products are rumored to be coming out soon.
 

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Racing Fuel????

Has anyone ever tried 109 octane unleaded Racing Fuel in a Gransport? I have access to all I need but I don't want to damage the engine.... any suggestions?

John
 

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Has anyone ever tried 109 octane unleaded Racing Fuel in a Gransport? I have access to all I need but I don't want to damage the engine.... any suggestions?

John
Yes, but it will do you no good without a performance chip to advance the timing and to correct the air / fuel ratio to take advantage of oxygenated fuel.

We do have a 110 Octane program for VP with our "flip chip" You will notice the difference, I prefer to mix 110 with 91 to get to about 96 Octane for the street, and we've developed a program for that combination as well. That way you get nearly max power for the street but keep the costs and hassle factor a minimum. You only need to keep a 5 gallon around of VP and mix at the pump as opposed to a 55 gallon drum or buying at the racetrack.
 
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