# Which MAF sensor should I use on my SR20DET?

**URL:** <https://forums.speedlife.net/t/which-maf-sensor-should-i-use-on-my-sr20det/105176>\
**Category:** SON240sx Automotive\
**Created:** [April 3, 2007, 7:51pm UTC](https://forums.speedlife.net/t/which-maf-sensor-should-i-use-on-my-sr20det/105176 "2007-04-03T19:51:26Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![BAS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bas/32/5540_2.png) [@BAS](https://forums.speedlife.net/u/BAS)\
**Post date:** [April 7, 2007, 5:53pm UTC](https://forums.speedlife.net/t/which-maf-sensor-should-i-use-on-my-sr20det/105176/8 "2007-04-07T17:53:51Z")

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This makes absolutely no sense, what is the point of running larger injectors if nothing else is going to change. Any change in injector size on your ECU is going to require a retune, your not an OBD II where you have some learning leeway. You’ve got a basic ECU that has limited mapping range to work with.

So to answer your question the biggest injector you can run on your OEM ECU without a retune or S-AFR/AFC is your OEM injectors.

> [@Tonight channel 4 news - car mods!!!](https://forums.speedlife.net/t/tonight-channel-4-news-car-mods/11981/2):
>
> This might sound like a noob question but I have been getting mixed responces on this so I thought I would ask you guys to see if any one has ran into the same problem.
> 
> And please don’t answer Z32 MAF sensor I have one already, I was going to run 550cc injectors but I change my mind I want to run the biggest injector possible without having to change the stock ECU and get into tunning etc.
> 
> That’s my other question what is the biggest injector I could run without changing ECU and tunning etc. ?

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