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Old 05-26-2010, 09:32 PM   #1
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Default How much horsepower can I expect?

1990 that will have the following installed this weekend:

Warner-Ishi (RH-B5?), with the Thunderbird upgrade on the compressor side @ ~10psi
I think begi manifold (or fm)
begi dp (or fm) I forget
370cc injectors
link ecu w/ afm delete
clutchmasters flywheel (8lb~) and stage one clutch
intercooled w/ bypass valve
2.5'' exhaust w/ hollowed out cat but with muffler


It will be dyno tuned immediately after having this installed.

Any ideas of about how much horsepower to expect? Thanks!
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Old 05-26-2010, 09:41 PM   #2
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I have no idea what the turbo will get you, but stock fuel pressure with the 370s will be a limiting factor, somewhere around 175whp will max them out. I freaking hate the thought of injectors with no headroom, you really do find out they have nothing left only when it's too late.
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Old 05-26-2010, 09:45 PM   #3
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I can install a walbro 255 also, or is there a better one? I'll order it now so I can install it while I'm doing everything else.
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Old 05-26-2010, 09:49 PM   #4
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It isnt the fuel pump that limits you. It is the injector sizing. You can either upgrade to large injectors or get a RFPR to push more fuel for them. Realistically the larger injectors is the path you need to go.
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Old 05-26-2010, 09:49 PM   #5
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Quote:
Originally Posted by linuxbox View Post
walbro 255
No offense here, but why? It'll just keep your return busier.

An afpr will buy you more headroom from your injectors (some), and there is no need for a big fuel pump with it or the stock pressure regulator. What are you trying to do?
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Old 05-26-2010, 10:07 PM   #6
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My friend had his 92 miata with RC 370CC injectors putting down 210HP at the wheel, but the injectors were basically at 100%. I would suspect you'll be at 180ish hp.
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Old 05-28-2010, 03:58 PM   #7
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I'm getting 460's now to put in, will I need a AFPR or another fuel pump or is the stock pump alone fine?
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Old 05-28-2010, 04:01 PM   #8
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The stock fuel pump is fine, and you won't need an AFPR.
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Old 03-31-2013, 12:11 AM   #9
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Quote:
Originally Posted by shuiend View Post
It isnt the fuel pump that limits you. It is the injector sizing. You can either upgrade to large injectors or get a RFPR to push more fuel for them. Realistically the larger injectors is the path you need to go.
im installing my turbo next week, but im confused now about what you just said. im using 750cc inj. now do you think i could use BOSCH 69659 Fuel Pump? please help
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Old 03-31-2013, 01:39 AM   #10
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herp
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Old 03-31-2013, 01:40 AM   #11
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Quote:
Originally Posted by fhdez87 View Post
im installing my turbo next week, but im confused now about what you just said. im using 750cc inj. now do you think i could use BOSCH 69659 Fuel Pump? please help
you dont need a new fuel pump install bigger injectors tune it with your ems and youre done
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Old 03-31-2013, 01:43 AM   #12
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Basic description of fuel system: The stock pump is only keeping 60psi in the rail before the fpr opens and lets the remaining pressure back to the tank, and it's a very easy job. When required, the injectors open to squirt fuel, and how big they are determines how much fuel they'll squirt. So your injectors will squirt up to 750cc of fuel per minute AT 60psi

If you buy an adjustable fuel pressure regulator, you can raise that pressure a little and get a little more out of your injectors. So your [email protected] could be more like [email protected] I'm sure there's a formula to find out the exact flow at higher pressures, I don't know it.

But the stock pump doesn't run I to issues until upwards of 100-120psi, so don't replace it unless its having issues.
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Old 03-31-2013, 05:29 AM   #13
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Yes i am gonna use a fuel presure regulator. Thanks for your reply man i really appretiate it.
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Old 03-31-2013, 05:53 AM   #14
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I wouldn't. Your 750cc injectors can support around 350-400hp. You're not making that much, and therefore wasting money with an adjustable fuel pressure regulator.
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Old 04-03-2013, 04:09 AM   #15
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Quote:
Originally Posted by curly View Post
I wouldn't. Your 750cc injectors can support around 350-400hp. You're not making that much, and therefore wasting money with an adjustable fuel pressure regulator.
yes it is true im just gonna make like 250 or less, but i have an old universal regulator from my 99 integra turbo and i didnt really use it, so its new thank you for the advice.
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Old 04-03-2013, 08:28 AM   #16
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Quote:
Originally Posted by fhdez87 View Post
yes it is true im just gonna make like 250 or less, but i have an old universal regulator from my 99 integra turbo and i didnt really use it, so its new thank you for the advice.
So sell it and put that cash towards other things?
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Old 04-03-2013, 10:31 AM   #17
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Frank you need to stop posting and start reading dude.

Bumping old threads which have exactly the information you were looking for is pretty weak.
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Old 04-03-2013, 10:35 AM   #18
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Quote:
Originally Posted by fhdez87 View Post
yes it is true im just gonna make like 250 or less, but i have an old universal regulator from my 99 integra turbo and i didnt really use it, so its new thank you for the advice.
sounds like a perfect reason to add pointless complexity to a car you have no idea what youre doing with...
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