My setup to come...
 

I will have a Street Ported, freshly rebuilt s5 TII Motor with my LT8 soon. This will be complimented with a 255 Hi-Flow Walbro, custom TID that will end at the Brake Duct (compliments of my East Bear Headlight Kit that allows for tons of space for this and a future FMIC), followed lastly by a 3" full exhaust with no Cat.

I ask, will I run super lean by maxing out the Fuel Injector's? Can the LT8 allow wnough fuel to my setup using my 550cc FI's? Do you think I will or should have to upgrade my Injectors to bigger ones?

For what It's worth, I just recently had my FI's machine cleaned and the one replaced with a newly cleaned one. Apparently, It had a sticky valve.

Sounds like a good setup.

Running lean will depend on a ton of stuff. Are you running stock turbo? If your running stock turbo at stock boost levels then I don't see a problem. If you want to turn the boost up a bit say to 15psi plus I would have upgraded the injectors, and looked at a new FPR.

I will have a new S4 motor with very large streetport. To4b hybrid turbo. I will be running an FD fuel pump. 680cc primaries, 1600cc secondaries, Paxton FPR, parallel fuel rails.

Thanks for the response...

Yes. I will be running the stock s5 TII Turbo. Atleast for now.:) I have a HKS EBC aswell that will allow me to raise the boost should I not run lean. Thats my biggest worry now.

I think this Is a sweet setup but don't want to have It short lived.:D As I mentioned before In another thread, I'm a noob again - since I entered the darkside.

What else should be considered?

How about my setup? Stock -RE motor, 4x550s, RB 3in exhaust, stock S5 turbo, and NPR FMIC :D

Check here to see if you will be ok.
http://www.rx7.com/cgi-local/2ndgencalc.cgi

(put 80 as the percentage)

And It Is working out for you? Sounds very much simular to my set up except I'll have a 13BT with street port. Details please.:)

I came across this at one point or another. 80 as a percentage for what? ECU Controlled Max Duty Cycle? Max Duty Cycle?

For the 2 above at 80 percent, I only have 253hp.:(

Ok so you know you could make more hp than that so you just have to limit your boost to stay within the fuel limits. Probably keep it 6-8psi?

Or Increase the Boost...until leaning occurs. Yah. I just wanted to get a hypothesize. Thanks for the link.:)

I think that calculator is a little conservative. The Max HP number can be increased by using a larger fuel pump and raising the fuel rail pressure. However Silverrotor I would not raise boost much past 10-11psi with the stock injectors, even with a Walbro. But that's just me.

Also, If I am running a TMIC too, I'd limit Boost to no more than 10-12. I'd think with the conservative number tabulated through your link, that having a standalone EMS would compensate for much more HP. I remember Brandon saying that the removal of the AFM, In conjunction with the MT LT8, would be good for 20-30 hp. Again, don't quote me on that.:)

Personally I'd go with some 720s in the secondaries to be safe. You will have the capability to tune them down easily with the LT-8 and it will make things much easier to up the boost, and much safer at the same time.

And rx7_turbo2:

I assume you have a microtech as well correct? Are you planning on getting a whole new larger turbo in the future? Because I have the same setup as you and am running pretty rich with just 720s in the secondaries.

I agree 100%

Yup I have an LT8. I do plan on a bigger turbo in the near future. Chris Ng on this forum runs the same turbo with 720 primaries and 1600 secondaries controlled with a Wolf 3d, it controls the fuel just fine. I am going to be breaking a new motor in with the microtech, so I will use 550 primaries and 680 secondaries with the FD pump to do that. I figure it should work fine for break in. Then once the motors broken in I will swap in the 1600's and tune it with a wideband.

Glad to have all this Info. At a later date, where would be the best place to get a deal on 720s?

Ya, your way is fine. Just wanted to make sure you know that with your current hybrid you will have a helluva lot of fuel ;)

I got mine for $110 a piece from rx7store.net but I have seen some used ones for about half that lately.

Havent started it yet. Im waiting for a local shop to finish making my IC piping.

Just an after thought...With my proposed set, won't I be seeing higher than normal boost levels? ie dangerous levels, possibly maxing out the 550 FI's?

I think now, come to think of It, this Is why I posed the Initial question.:)

Ok, there is no point in dicking around. Bigger injectors are better than injectors that are too small. If your concerned about it get bigger injectors.