LittleBlue!

HP tuners 2014 Chevy Spark (and beyond)

17 posts in this topic

Posted (edited)

I just ordered the VCM suite from HP Tuners with the MVI2. My interest in tuning my spark came from the turbo project I am currently working on. I plan to familiarize myself with the tuner before the turbo project is complete and I will share my experience here. 

Edited by LittleBlue!

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HP tuners has updated their website showing 2014 to 2017 are tuneable. Unfortunately, it will require 4 credits for licensing ($189).

 

With the research I have done so far I want to:

1. Ensure wide open throttle (WOT) IS 100%

2. Remove any delay in power enrichment (PE)

3. Flex fuel tuning

 

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Posted (edited)

does the 2014-2017 have the same engine set up though?

 

And is that for each of the items?

Edited by zamlawls
adding

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23 minutes ago, zamlawls said:

does the 2014-2017 have the same engine set up though?

 

And is that for each of the items?

The engine is different from 2014 to 2017. My 2014 is a 1.2 and 2016+ are 1.4. I'm hoping that I may only need two credits because there is an asterisks next to the 4 credits that relates to the 2017 model. The credits are what allow you to write new information on your ecm. It is a one time payment and you can tune that ecm as much as you want. 

 

https://www.hptuners.com/vehicles/

 

Screenshot_2018-08-25-01-13-15-1.png

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Posted (edited)

Here is an introduction to the product. It was updated relatively recently. 

 

Here is an amazing write up from HP tuners about how to tune the e78 which is the ecm in the Spark. They have a torque based control structure which is unique but this guide breaks it down nicely: 

 

https://www.hptuners.com/help/vcm_editor_tuning_how_to_advanced_e78.htm

 

Edited by LittleBlue!

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The MVI2 was delivered today. I hooked it up to my car and saved the file as the original. Following the guide from HP tuners that I previously posted, I was able to locate some of the values that I need to change. 

1535415021206_image.png

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Following the HP guide I was able to locate the other figures that will be changed. Now I have to determine how much I should increase those values.

image.png

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Posted (edited)

This one is pretty straight forward. The electronic governor is set at 109mph. You can set it at anything from 0 to 318mph. I will max it out, effectively removing it.  Not sure if I'll ever make it over 109mph but it may help top end acceleration and why not?

1535418418703_image.png

Edited by LittleBlue!

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This is the power enrichment tab shown with stock defaults. PE is triggered only when the conditions listed are met and the throttle is at 92%. I lowered the RPM threshold from 6k to 3k, removed the .008s delay, and reduced the throttle threshold to 75%. I increased the enrichment ramp in rate to the maximum. 

1535430733370_image.png

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I run e30 in my car currently and due to the differences in fuel, I would like to tune the vehicle to run as efficiently as possible. One change is the stoichiometric air fuel ratio, which basically means best fuel to air mixture. 

 

87 octane regular fuel is around 14.7. The more ethanol you add, the richer you need to run to compensate for lower energy content. As the chart below shows, 13 air to fuel ratio is ideal for e30.

 

Below are screenshots of the stock 14.7 setting and after I changed it to 13.0. My car does not have an alcohol sensor so I changed all values in the table. 

1535929586592_image.png

Edited by LittleBlue!

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Just want to give a Bravo for the work and documentation you're putting in. Thank you and keep it up. It's certainly appreciated.

LittleBlue! likes this

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1 hour ago, GammaRadiation said:

Just want to give a Bravo for the work and documentation you're putting in. Thank you and keep it up. It's certainly appreciated.

 

Thanks! I have been having a lot of fun. I try to document the process as much as possible to hopefully help others (if not from success from my failures along the way). It's a learning process and we all learn better together. 

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Here is a very helpful overview of using HP tuners on a torque management system like the Chevy Spark's e78:

 

The Driver Demand table is now a crucial part of the calibrators’ lexicon. The ECM uses Desired Throttle Torque to calculate the Desired MAP, which in turn uses Throttle Inlet Absolute Pressure sensor to determine how much to open the throttle blade to achieve the Desired MAP. This is crucial to understand because in a turbo application, you could crank up the boost and make the same power because the throttle closes to compensate. Now the Driver Demand tables are what command engine power based on vehicle speed and position of the gas pedal. From there it is converted into Driver Demand Axle Torque, where it is calculated by a number of things including Axle Torque Limits, Maximum and Brake Torque Limits.

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Based on the previous quote, if I plan on running even 5 psi of boost, I will need to increase these values. I'm not sure maxing these out is the best approach. To be determined. 

1537242634152_image.png

Edited by LittleBlue!

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Here's the table for throttle %. Assuming no other limiters are active this is the % of throttle at various RPMs. Notice wide open is limited to 87% (13 on the table) from 3,200 rpm to 6,000 rpm. I will change that to 0 and hopefully that will open the throttle 100%. Once I get my car back togetherand running I will be able to verify this with the scanner. However, this 87% max is consistent with my previous scans of stock settings.

1537720447092_image.png

Edited by LittleBlue!

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I ordered a wide band guage from AEM. A wideband replaces the second O2 sensor or can just be placed in the exhaust and reads the air fuel ratio. This guage plugs right in to the obdII port and can log data in hptuners. This is crucial for me to adjust for the increase in air with my turbo and increase in fuel with the modified injectors. 

 

Here's a video explaining it a bit 

 

 

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I've hooked up my flex fuel sensor just before the fuel rail and wired it to the ecm. The next step is to enable the sensor in hp tuners. 

image.png

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