• Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


R35 MAF pipe diameter

Recommended Posts

OK, I have spent half an hour trawling search results without concluding anything. 

Is anyone able to definitively state the stock MAF pipe diameter for an R35? I am looking at using a single R35 MAF (I assume they have one for each bank, never looked) in another application altogether. It may not even end up used in the final tune of my car.

My ECU has a table of voltage versus grams/sec airflow for a MAF which I like a lot better than at least the early Nistune/Nissan table of MAF percentage that has been kludged back to a HP figure not an air mass, but I have not yet found the pipe diameter Nissan used to validate the data for my setup. Another option would be a HPX MAF as they provide a spreadsheet to scale the output to any pipe diameter you like with the output in various formats, but they cost maybe 50% more than the R35 unit.

I am looking at it for my HR31 track car, which has an Emtron KV8 ECU. I am looking at it for light load use in the tune, blended out to speed density at higher loads, but also to validate data and refine a table related to throttle body mass flow calculations used elsewhere in the ECU and potentially for some turbo dynamics stuff (Data nerd here) 

Fundamental to the lot is knowing what diameter pipe Nissan used so that the MAF table in my ECU matches reality. If I cant define that I will be better off spending the extra hundred bucks or so for a HPX and be done with it.

Share this post

Link to post
Share on other sites

I am guessing after a good few days with no response that I am on my own on this one. Pity, but it makes the money on a HPX look like the better option. When I am am aiming to nail down one known good data point in the setup to swing a number of tables off it makes no sense to go guessing. 

I am betting no Nissan dealer is going to be very keen on letting me take the inlet apart on an R35 to find out for myself 😥

Edited by Blue

Share this post

Link to post
Share on other sites

I will go check it out on FB. There is no real pressure on it at the moment, I am not going to do much on the car over Christmas.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now