FiveO 550s or 750s - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Niztec · 02-16-2011, 08:20 PM

Hi has anyone tried using these injecs on their SR with any success? If so what is the max power you ever achieved on either?

Niztec · 02-17-2011, 11:33 AM

Nobody?????

kandyflip445 · 02-19-2011, 01:37 AM

If they flow the advertised amount you can figure out your approximate max hp with a formula. I don't remember it though. lol It is, however, on this site so just to a search on here or google.

As far as a review on the brand I have no idea.

Niztec · 02-22-2011, 06:18 AM

Thanks Kandy

I would prefer to work with the 750's as opposed to the MSD equivalent.

Quote:

Originally Posted by kandyflip445

If they flow the advertised amount you can figure out your approximate max hp with a formula. I don't remember it though. lol It is, however, on this site so just to a search on here or google.

As far as a review on the brand I have no idea.

codyace · 02-22-2011, 07:25 AM

Quote:

Originally Posted by Niztec

Thanks Kandy

I would prefer to work with the 750's as opposed to the MSD equivalent.

So you'd rather trust rebuilt/redrilled injectors

MSD 72lbers will be fine. The 50 lbers are the ones that had issues 10 years ago running at 100% duty (go figure) and would go static.

Power wise, for the OP: 550's would be safe for 350ish whp, 750's good for 450-475.

BUT, when it comes to redrilled / non manufactured injectors, it's hard to ever really know. Use those above HP estimates just as 'references' towrads peak not fact.

Niztec · 02-22-2011, 07:44 AM

Cody I was under the impression msd 720cc injectors don't function too well @ 4bar. That's why I am a bit apprehensive towards the msds.

codyace · 02-22-2011, 08:51 AM

Quote:

Originally Posted by Niztec

Cody I was under the impression msd 720cc injectors don't function too well @ 4bar. That's why I am a bit apprehensive towards the msds.

Most of the issue stemmed from the 50 lbers being overworked at underdeveloped for quite some time. Then again, there are countless other guys running MSd 50lbers safely for countless years now, so long as they aren't being pushed beyond their design.

With that said however, do you need 4 bar of base fuel pressure? 72lbers at 4 bar would really be in the 800cc range....if you really need that much fueling, I'd go with a 1000 cc injector and call it a day.

Don't discredit RC injectors either...same 'Lucas Type' injector. I just simply do not trust redrilled or reworked injectors.

02-16-2011, 08:20 PM	#1
Niztec Join Date: Feb 2011 Location: Jamaica Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	FiveO 550s or 750s Hi has anyone tried using these injecs on their SR with any success? If so what is the max power you ever achieved on either?

02-19-2011, 01:37 AM	#3
kandyflip445 Post Whore! Join Date: Sep 2002 Location: Arden, NC Age: 36 Posts: 4,460 Trader Rating: (1) Rides Gallery: kandyflip445 Feedback Score: 1 reviews	If they flow the advertised amount you can figure out your approximate max hp with a formula. I don't remember it though. lol It is, however, on this site so just to a search on here or google. As far as a review on the brand I have no idea. __________________ My 240 vBgarage

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02-17-2011, 11:33 AM	#2
Niztec Join Date: Feb 2011 Location: Jamaica Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Nobody?????

02-22-2011, 07:44 AM	#6
Niztec Join Date: Feb 2011 Location: Jamaica Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Cody I was under the impression msd 720cc injectors don't function too well @ 4bar. That's why I am a bit apprehensive towards the msds.