devdog1one

I am in the planning stages of my TII swap into my 87 Base. I purchased a donor 87 TII and have removed the follwing components:

Half-shafts
Differential
Driveshaft
Transmission
Engine

Upon removal of the engine I discovered it was an S5 motor with S4 oil metering pump, wiring harness (with spliced in injector connectors for the S5 injectors), S4 front cover, S4 LIM, S4 UIM, and S5 Turbo.

I checked into a turbo rebuild and it would cost $250.

What I was thinking about was purchasing a Stage 3 BNR upgrade for $725, but am not sure if the stock IC can handle the 340 RWHP rating of the BNR turbo. By the way it is a brand new IC. Actually still in the box.

I also will be installing a greddy Profec B II boost controller, Rtek 7 upgrade chip (FCD), greddy turbo timer, 2.5 inch RB downpipe, presilencer, catback, lightened steel flywheel, RB HD street/strip pressure plate/disc, walbro 255 lph fuel pump, blueprinted & cleaned inejectors, and all new air bleeds.

Will I need anything else? Any suggections?

Thanx from a turbo newbie.

Evil Aviator

It sounds like you have some nice hard parts, but a Mickey Mouse EMS setup. I suggest switching to a standalone EMS. That way you don't need to worry about the questionable wiring harness, you can ditch the AFM, tune the engine better, actually monitor your intake air temperature so you know if you need an intercooler upgrade, monitor your air/fuel ratio, and you will not need the Rtek chip or turbo timer. If you get an EMS with onboard boost control, then you will not need the Profec B, either.

If you want to stick with that setup, then I think you may need some type of fuel injector controller, unless the Rtek chip can take care of this.

You may want to check with BNR, but I think it's going to be difficult to make 340fwhp without a street port. You need to ask BNR about using the stock intercooler with their upgrade, but it sounds like an unnecessary restriction to me.

FYI 340rwhp is about 400fwhp. You can clean up your injectors as much as you like, but they are never going to support this horsepower level. You will need somewhere around 3436cc/min total for 400hp, depending on your fuel pressure, turbo/intercooler efficiency, tuning, etc. Your current setup is 550 * 4 = 2200cc/min total which is only good for about 255fwhp.

devdog1one

Evil Aviator,

When you say a stand alone, are you talking about a haltech that I am always reading about. What would you suggest for fuel injectors?

The low/high impedance thing is confusing me. Could you help clarify a little?

I was just quoting the webiste for the horsepower rating. I will e-mail them asking them anout what set up they had on it.

Thanx for your response. It helps alot.

Evil Aviator

Yes, but Haltech is a brand name, and they make several products. Other popular RX-7 standalone EMS manufacturers include Microtech, Wolf, and Electromotive. There are many other brands, but those are the most popular for the TII. Plan on spending $1,000-2,000 for the standalone EMS, and about $500 more for professional tuning. Much like rebuilding a turbo, this is something best left for the professionals. Yes, I know, it's a lot of money, but horsepower doesn't come cheap. Fuel computers are a little less expensive at about $300, and they will work OK for most situations, although not nearly as well as a standalone EMS that is tuned well. You will soon find out the it isn't the turbo itself that costs all the money, but rather all the junk you need to have to go along with the turbo.

See our Engine Management Forum for more information. We have some individual forums for the EMS products with the most discussion on this forum, and the less-discussed brands are covered in the general part of the EMS forum. Note that the Power-FC and AEM Plug & Play are only for the 3Gen RX-7.
https://www.rx7club.com/engine-management-forum-37/

I suggest that you do not buy anything until you get the rest of your engine system figured out. The type and size of fuel injectors will depend a lot on your horsepower level, fuel rail pressure, and engine management system.

https://www.rx7club.com/showthread.p...hreadid=163745

What I am trying to explain is that their horsepower rating is the capability of their turbo, not necessarily the capability of the engine system. You still need the appropriate cooling system, fuel system, and other modifications to take full advantage of their turbo upgrade. For example, you could buy tires rated at 186mph, but that doesn't mean that putting them on your car will in itself make it go that speed.

Beats the heck out of speculation and the internet peanut gallery comments, eh? I think the best thing is to just have a pencil and paper ready and ask them what you need. You may want to get a good clarification of all recommendations just in case the full-blown setup is a bit too advanced or expensive for your tastes, because you may want to back-track a little bit to keep the engine configuration a little more reasonable.