With this set-up how much Psi can I run with my current 550cc injectors - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-19-2011, 03:58 AM   #1
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Default With this set-up how much Psi can I run with my current 550cc injectors

I only plan on running high psi for about 2-3 days and about 5 straight line runs

94 Motor Balanced and Blueprinted
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Old 06-19-2011, 04:08 AM   #2
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I don't see an afpr on that list. And with all the increased flow of the reworked head/cams + that big of a turbo my answer would be: NOT a lot. Under 15 that's for sure.
Lots of variables are involved as well, so don't expect a precise answer. In fact, don't expect anything even remotely precise.
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Old 06-19-2011, 04:10 AM   #3
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I was running 19 psi at one point. That is when I blew out third gear in the transmission. So I know it is good for 19 psi .
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Old 06-19-2011, 04:11 AM   #4
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You'll tap the 550s out at ~300-310whp, which will probably be around 14psi with that setup. Be careful, use a wideband.

edit: I don't see a wideband. I'll guarantee that you weren't running 19psi safely from a 3071R on 550s at stock fuel pressure. Forged pistons don't give you immunity from being stupid with the tune - it just means the mistake takes longer to show up, and more money to correct afterwards.
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Old 06-19-2011, 04:11 AM   #5
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Quote:
Originally Posted by 3Thirdlife View Post
I was running 19 psi at one point. That is when I blew out third gear in the transmission. So I know it is good for 19 psi .
pressure=/=power
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Old 06-19-2011, 04:20 AM   #6
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When the car was dyno'd it dynod at 310Rwhp at 14.5 psi. The injectors were at 90% at 14.5 psi when dyno'd
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Old 06-19-2011, 04:26 AM   #7
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Quote:
Originally Posted by 18psi View Post
I don't see an afpr on that list. And with all the increased flow of the reworked head/cams + that big of a turbo my answer would be: NOT a lot. Under 15 that's for sure.
Lots of variables are involved as well, so don't expect a precise answer. In fact, don't expect anything even remotely precise.
I do have an afpr. I don't know how to use it though! lol do I need to turn it up with the boost?
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Old 06-19-2011, 04:32 AM   #8
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Quote:
Originally Posted by 3Thirdlife View Post
When the car was dyno'd it dynod at 310Rwhp at 14.5 psi. The injectors were at 90% at 14.5 psi when dyno'd
90% is already beyond the safe operating limits of injectors. You can't turn it up any more.

Don't touch the AFPR, don't touch the boost, don't touch a damn thing. Set it back exactly like your tuner set it, and just drive it. If you want more power, you need more injector and a new tune - you cannot just crank up the boost without compensating for it in the tune.
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Old 06-19-2011, 04:33 AM   #9
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Alright just being curious what is the perfect A/f ratio under load?
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Old 06-19-2011, 04:37 AM   #10
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You're either the biggest n00bsicle in the world that happened to buy a pre-built/tuned car or a troll. In either case, you're about to feel the wrath of mt.net with questions like that.
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Old 06-19-2011, 04:39 AM   #11
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Lmfao ik i'm a noob! Geez!!
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Old 06-19-2011, 09:12 AM   #12
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People have argued anywhere from high 10's to mid 12's for good afr under boost.
Guys, not to scare him, but wasn't he at 90% with his injectors party because of his stock fuel pressure? Wouldn't his Afpr change the equation and lower it?

But don't forget what sav said, 90% is already too high for comfort.
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Old 06-19-2011, 09:31 AM   #13
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You don't need any more power. I've seen how you drive. You'll blow yourself to pieces.
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Old 06-19-2011, 11:56 AM   #14
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Run all of it you *****
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Old 06-19-2011, 02:05 PM   #15
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Alright Thanks again guys!
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Old 06-19-2011, 02:31 PM   #16
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Take the car to a compitent tuner and have them tune the car to more boost pressure while also increasing the base fuel pressure. It's not just fuel you should be worried about. It's not as simple as turning up the afpr and running mire boost. Your motor will blow up. Unless the csr is tuned for 19 psi DO NOT run thamuch pressure again. Simply turnig up the base pressure will make your whole map richer causing it to run like poo. If you turn up the pressure you need a re tune.
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Old 06-19-2011, 02:32 PM   #17
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I would look at getting a set of ev14 based injectors that would support your hp goal and have some room incase of spikes or any other issues that arise
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Old 06-19-2011, 02:33 PM   #18
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Oh and ditch the link for a more modern ecu. Good luck finding anyone to tune that system.
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Old 06-19-2011, 10:01 PM   #19
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Quote:
Originally Posted by falcon View Post
Take the car to a compitent tuner and have them tune the car to more boost pressure while also increasing the base fuel pressure. It's not just fuel you should be worried about. It's not as simple as turning up the afpr and running mire boost. Your motor will blow up. Unless the csr is tuned for 19 psi DO NOT run thamuch pressure again. Simply turnig up the base pressure will make your whole map richer causing it to run like poo. If you turn up the pressure you need a re tune.
This is pure crap. I run 23psi all day every day and I have no AFPR.

Just run more boost and make that turbo happy!!! that is how you win
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Old 06-19-2011, 10:15 PM   #20
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I about you get bigger damn injectors.
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