Jump to content
  • Welcome To Mopar1973Man.Com

    We can see that your guest and been lurking about. When you register on the Mopar1973Man.Com site you'll be able to interact with all the other members. This is the most friendliest Cummins forum you'll ever join. Take the time right now and  REGISTER  on the Mopar1973Man.Com this will open up many more options and functions on the website. Everyone is very friendly and helpful just ask questions and everyone will help you out the best they can. 

Sign in to follow this  
dually

Compressor Map

Recommended Posts

This is what happened to me. I removed the 40 over rv fuel mpg test injectors, in my 8300 dually i did 18.5 mpg all hy miles. Then i removed the 20k over hg and replaced it with a factory one and put my 7x12 injectors back in. The 7x12 are around 200 to 240 over stock. I have to drive with the overdrive off because it can get smokey in traffic. So i drove around the city/hy mostly at 2000 rpm's and i am getting better fuel mileage. The turbo is a 64/71/13ss htt.So the question is do you think the gh change helped or running the turbo in it's peak map helped ? Or both.

Share this post


Link to post
Share on other sites

Update 250 miles to 1/2 tank. Thats 50 more with stupid big injectors and overdrive off. I did 200 in overdrive all on the freeway. Go figure.:shrug:

Share this post


Link to post
Share on other sites

removed the 20k over hg and replaced it with a factory one and put my 7x12 injectors back in.

??? Head Gaskett ?? Dunno man thats weird - even the HY would still be in its compressor map range at up to 25-30psi which your not running just driving around town. And such quick spoolup with the hy35 would think efficient at lower end So 1) More air flow with the 64/13 at the same rpm/speeds better combustion/efficiency 2) Lugging a little before in town in OD but not as obvious with the RV275 ? I more inclined to think its both like the extra airflow cfm and the runnning without OD. Injector style plays a role too ... I get same mileage with my +75 HP CPP injectors as my rv275s and both more than stock.

Share this post


Link to post
Share on other sites

Thats what i am thinking the head gasket. I had plans and they changed but the 20 over headgasket killed the low end for sure.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  



×
×
  • Create New...