MPG after CP3 Conversion

[kashtyaatsi]

So after putting over 12k miles on the CP3 pump and driving in all conditions and weather I can confidently say my mpg has dropped about 15-20% since. Car is tuned by Malone and they say everything looks normal. They also say that a drop in mpg is normal as the CP3 has more pumping losses. Could something else have happened during the install to cause a drop in mpg? Surprisingly this is most significantly noticed while on the highway (Cruise control set at 70mph a majority of the time). Taking trips I regularly do (500-1000 miles) and have always gotten between 49-51 mpg, the past two times I've have gotten right around 42 mpg. In town the loss is much less, around 44 mpg previously and 41-42 mpg now. I have always driven the car hard and continue to do so (hitting redline every drive at least once) Curious to see others findings. And yes the mpg decrease was noticeable immediately after the install. Car seems to run fine other than some higher egts than I'd like to see.

It's a 2011 Golf 6MT - Mods:

- GTB1756vk Turbo from Xman
- Whitbread CP3 kit
- 2200 bar fuel pressure sensor
- 4 bar map
- S3 intercooler
- Deleted all the way back to stock muffler
- EGR and cooler delete
- Aux pump delete

 

[turbodieseldyke]

They also say that a drop in mpg is normal as the CP3 has more pumping losses.

"It's normal to lose mpg because our tunes suck."

 

[kashtyaatsi]

Ha I expected some response similar to this.

 

[tdipig]

So after putting over 12k miles on the CP3 pump and driving in all conditions and weather I can confidently say my mpg has dropped about 15-20% since. Car is tuned by Malone and they say everything looks normal. They also say that a drop in mpg is normal as the CP3 has more pumping losses. Could something else have happened during the install to cause a drop in mpg? Surprisingly this is most significantly noticed while on the highway (Cruise control set at 70mpg a majority of the time). Taking trips I regularly do (500-1000 miles) and have always gotten between 49-51 mpg, the past two times I've have gotten right around 42 mpg. In town the loss is much less, around 44 mpg previously and 41-42 mpg now. I have always driven the car hard and continue to do so (hitting redline every drive at least once) Curious to see others findings. And yes the mpg decrease was noticeable immediately after the install. Car seems to run fine other than some higher egts than I'd like to see.

It's a 2011 Golf 6MT - Mods:

- GTB1756vk Turbo from Xman
- Whitbread CP3 kit
- 2200 bar fuel pressure sensor
- 4 bar map
- S3 intercooler
- Deleted all the way back to stock muffler
- EGR and cooler delete
- Aux pump delete

I just finished a r70 cp3 and have only done city test runs but it does seem to be down so far…you ever find a cause for yours? I’m still trying to figure out the cam timing on these (cbea) and how it sets itself after you’ve messed with the cam gear

 

[kashtyaatsi]

I just finished a r70 cp3 and have only done city test runs but it does seem to be down so far…you ever find a cause for yours? I’m still trying to figure out the cam timing on these (cbea) and how it sets itself after you’ve messed with the cam gear

No luck so far.

 

[tdipig]

No luck so far.

Well sorry to report mine seems to have gone up a little after some more test runs on the highway. For yours 20% decrease is a lot…something is definitely going on there. I’d double check the timing, obviously not cp3 timing, and make sure the hub isn’t slipping on the pump…torque stripe it or something. Also make sure your metering valve is correct, although you should have seen some codes, and make sure your pump doesn’t need the aux pump...piston ones like the r70 do

 

[smelly621]

It's a 2011 Golf 6MT - Mods:

- GTB1756vk Turbo from Xman
- Whitbread CP3 kit
- 2200 bar fuel pressure sensor
- 4 bar map
- S3 intercooler
- Deleted all the way back to stock muffler
- EGR and cooler delete
- Aux pump delete

So you were getting 50mpg with all the above mods except the cp3? Was it already tuned by Malone?

I have near identical mods, but best I get is 37mpg, which is an improvement over the 33 I was getting stock. Also Malone tuned with egts that seem higher than I'd expect.

Been meaning to reach out to @Xtremefunky and what's involved in getting a better tune.

 

[kashtyaatsi]

So you were getting 50mpg with all the above mods except the cp3? Was it already tuned by Malone?

I have near identical mods, but best I get is 37mpg, which is an improvement over the 33 I was getting stock. Also Malone tuned with egts that seem higher than I'd expect.

Been meaning to reach out to @Xtremefunky and what's involved in getting a better tune.

Yep I had all those mods and on Malone's "stage 4" tune already and could get 50 mpg on long highway trips. Immediately after the CP3, new fuel rail sensor and CP3 tune the mpg tanked. On moderately warm days (mid 80's) I'll see egts around 900-1000F just cruising flat highway at 70 mph... That always seemed high for me.

 

[pro51492]

Mine went down as well. Malones tunes suck period. I could get 47 consistently before the stage 3 tune with CP3 and CR170, now I average Around 44-45 only perfect conditions warrant 47+ I drive around 800 miles per week almost all highway at 70mph and drive the car for efficiency.

 

[smelly621]

That's wild, back in the day when the cp3 swap was just getting going people claimed it had lower pumping losses. Seems like a dramatic difference. My egts in the golf are way higher in the same load situations compared to my 2005 5.9 cummins, which seems ridiculous and has always left me thinking I'm over-fueled. Spent awhile going through all the vcds measuring blocks but never found a way to log lambda using the stock sensor

 

[lemoncurd]

dog piling, my MPG went up by switching to xtremefunky.

funny enough, my car actually cools off even in 70f weather when on slight declines now.

my thermostat isnt even bad either. mr funky's tunes are just so much more efficient than malones.

im swapping to CP3 shortly! it's sitting my garage waiting for my timing belt. looks like 2-3 weeks then im getting into it

 

[pro51492]

May have to give his tunes a shot. How do you load them?

 

[kashtyaatsi]

I would be curious to get my logs looked at and get a second opinion as well.

 

[lemoncurd]

May have to give his tunes a shot. How do you load them?

tactrix openport 2.0 + PCMflash with the correct module for your ECU.
that is what i have.

@Xtremefunky may have some recommendations for flashing aswell.

after you buy, you send him a read. then he edits the binary and sends it back. you do this over and over as you log different measuring blocks dialing the tune in.

 

[x1800MODMY360x]

tactrix openport 2.0 + PCMflash with the correct module for your ECU.
that is what i have.

@Xtremefunky may have some recommendations for flashing aswell.

after you buy, you send him a read. then he edits the binary and sends it back. you do this over and over as you log different measuring blocks dialing the tune in.

I got both, I will do in the winter time as I'm not happy with malone.

 

[smelly621]

@lemoncurd - can you pm me where you ordered that tool from? I have a clone ktag I could never get to read and wouldn't trust to write so have been dragging my feet getting in touch with Mr funky assuming that was the only affordable option.

 

[lemoncurd]

@lemoncurd - can you pm me where you ordered that tool from? I have a clone ktag I could never get to read and wouldn't trust to write so have been dragging my feet getting in touch with Mr funky assuming that was the only affordable option.

your bio says you have a 2001 golf. not sure if that's accurate still. if so, hit up burpod for a tune. xtremefunky does mostly common rail stuff to my knowledge

genuine flash tools can do something called a "virtual read" of the ECU. it's rare to do an actual read of an ECU anymore.
i would say, buy a spare ECU and test flash that given you have a china clone.

 

[smelly621]

your bio says you have a 2001 golf. not sure if that's accurate still. if so, hit up burpod for a tune. xtremefunky does mostly common rail stuff to my knowledge

genuine flash tools can do something called a "virtual read" of the ECU. it's rare to do an actual read of an ECU anymore.
i would say, buy a spare ECU and test flash that given you have a china clone.

This was in regard to my 2010 golf. Did some more digging and seems genuine versions of the tool and software you mentioned are actually not $1000s of dollars.

Do you know if you're able to do a true full read via odb2 or is it a virtual read?

 

[lemoncurd]

This was in regard to my 2010 golf. Did some more digging and seems genuine versions of the tool and software you mentioned are actually not $1000s of dollars.

Do you know if you're able to do a true full read via odb2 or is it a virtual read?

virtual reads only by OBD2. virtual reads are fine, they are simply files someone else has read and uploaded to the web. they are the same as you have in your ECU except they are missing immo data.