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Old 04-08-2007, 09:37 AM   #1
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Default 1.8 injector specs - discrepancy in the FAQ?

Just wanted to check the 1.8 (tantop) injector capacity.

The DIY FAQ states two different values - 254cc and 265 cc.

Further, I've done numerous searches online and also have a (saturated) value of 240cc.

Which is correct???

I'm looking to know exactly so I can input the correct injector correction factor into the EMB.

Cheers.
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Old 04-08-2007, 09:44 AM   #2
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EMB correction isnt enough to register people use them stock with no mods, so just put in 240 and call it a day.
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Old 04-08-2007, 09:52 AM   #3
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Tan top injectors in a M1, will run 235/240 cc.... The reason they flow up to 260 in a M2, is because of the 60psi fuel system....

So if you are running the stock return system, in an M1, 240 will be fine for a correction factor. <G>

The M2.5's have different injectors IIRC though, which might flow a little more... different colour top too....

dave,
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Old 04-08-2007, 10:41 AM   #4
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Thanks heaps guys.
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Old 04-08-2007, 11:29 AM   #5
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injectors are usually spec'd at 43 psi.
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Old 04-08-2007, 02:43 PM   #6
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I used 240 and it came out real close to perfect.
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Old 04-08-2007, 03:10 PM   #7
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I have two specs because I havent seen a consitant flow yet. I've seen some reports of around 255cc or so (Witchhunter's) @ 43.5psi, and some at 265cc or so (Bruce's, Ben's and Flyin' Miata) @ 43.5psi, but it gets you in the ballpark.

But from my dyno results, they worked out to be 265cc, and what I consider them to be.

It's just like the 305cc supra injectors that all flows I've seen flow them at around 315cc.
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Old 04-08-2007, 05:38 PM   #8
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Quote:
Originally Posted by Uncle Arthur View Post
The DIY FAQ states two different values - 254cc and 265 cc.
Really the difference between those values isn't great enough to matter. There's quite a bit of fudge factor here as closed loop the car will figure out fuel delivery on its own and open loop is programmable via the emb.
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