Is this chip any good for my car until I figure out which stand alone is right for me, or is there a possibility I am wasting my money and might end up hurting my engine?

JDM
RX7- FC3S KNIGHT
SPORT PERFORMANCE
ECU CHIP
For 88-91 RX7 TURBO
FOR N374 ecu's
With manual transmission(5spd)

 

Just wait and go stand alone. This will be useless once you do. Just a waste of money IMHO.

 

?? What does that mean?

 

IMHO = in my honest opinion.

 

I'm running that ECU on mine and I honestly couldn't say a bad thing about it.
As a cheap plug and play play mod it's awesome. You'll notice instant performance gains over the stock ecu due to better fuel maps, fuel cuts removed, and takes to basic mods very well.

I'm running mine with a T04 hybrid turbo, FMIC, etc.. and it works great, it's limited to about the 160-180rwkw (stock injector max) but up until that point it it's awesome. I bought mine with the intention of using it until I got a standalone ecu organised and becasue of how well it works I've been in no huge rush to go standalone, however I have a microtech now, just need to install it

 

Thanks for the input I might get it until I know which stand alone ecu to get. What does 160-180rwkw mean?

 

how much fuel it lets in?

 

Ok how much fuel will let let thru with 720 cc secondaries? does anyone know?

 

kw is a form of power measure.

rwkw = rear wheel kilowatt

so 160 - 180 rwkw = 214 - 241 rwhp

where hp = horsepower and rwhp = rear wheel horsepower

FYI, 1 kw = 1.34 hp

 

Thank you. How can you measure rwkw?

 

same way you measure rwhp, with a dyno. It probably just displayed in kilowatts instead of horsepower.

 

Yeah in Aus power is more often measured in KW's instead of HP, so it's become a somewhat standardised form of power measurement over here.

If i recall correctly the ECU's fuel maps are good up to 1 bar (14.7psi). Over in japan they would run this ecu with a rebic controller and extra injectors if they want to break that 160-180rwkw zone.
I'm running a walbro intank fuel pump with mine and it handles it fine, not sure how it would got with bigger injectors though...

 

im thinking about running this chip (i have it) with my 800cc secondaries and a walbro, coupled with my safc2 off of my n/a until i get a standalone... anyone have any experience with this setup?

 

I was told not to bother using the knightsport chip for my stock ecu and not to bother using the knightsport rom ecu for my for either so I am just getting a stand alone.

 

It's a good upgrade over the standard ecu, but of course no where near as good as a standalone. Mine's worked well as a temp replacement over the stock ecu until I go standalone.

 

I had a knightsport chipped ecu in my turbo vert, and it made a definite difference. No fuel cut, no rev limit, and extra fuel especially on top end. I dont know about the ones sold on ebay, whether or not they are "real" but if they are, I wouldnt hesitate to use it.

 

Not to get offtrack again, but doesn't IMHO mean In My Humble Opinion? Not Honest. Anyway, yeah sounds like a decent part.

 

kevin im gonna put this in the black turbo i got from you... i just want to make sure it will be mapped for my setup...
with the fuel cut on the chip i wont need my fcd any more? should i remove that?
also i have 800cc secondaries and a greddy fmic / racing beat exhaust, no emissions...
should i also install my safc2? im really confused about chips, i understand mechanics a lot more than this :/

btw the car is amazing

 

Chips are a good way to get more out of stock or near stock cars with just an intake/exhaust/ic. IF you have larger injectors and other tuning devices like safc's the chip is pretty useless. The chip removes the factory cutoffs, so you dont need an FCD anymore. IT also increases injector pulsewidth at times, meaning it holds the stock injectors open longer to deliver more fuel. IF you have bigger injectors installed, guess what...you are already delivering more fuel.

Let's look at it this way. The stock injector is 550cc. Let's guess that at a certain point on the load map, the injector pulsewidth is 0.2 seconds. That's 1.8cc of fuel injected per injector, per pulse.

Now, lets say you go around and put in 680's all around while keeping the stock ecu, whch can be done and still have the car idle and run halfway normally. The computer doesnt know anything has changed, and still operates the same pulsewidths. Now at that same pulsewidth you are delivering 2.25cc of fuel. This change is effective all across the board equally...whatever the difference between stock and aftermarket injector volumes, in percentage, you'd be injecting that much percentage extra of fuel at all rpm points.

IF you install an safc or other tuning device you are basically adjusting pulsewidth in order to adjust fuel delivery. So you'd tune the safc, which would cut the pulsewidth at times, and get the fuel delivery back almost to where it was stock, but at certain load and rpm levels you'd want more fuel than you had stock, which was the goal of all of this.

If you use the chip, it will increase pulsewidth for you, again only at certain load/rpm points. The big difference is that it was "tuned" for stock injectors...it INCREASES pulsewidth, and cannot decrease it. The only way to get more fuel out of the stock fuel system is to increase pulsewidth in the computer, and thats what the chip does. Therefore..if you have larger injectors, you need to DECREASE pulsewidth in most places to lean the fuel mix back to an acceptable level. So the chip will make for a worse running car in this situation, not a better one.

 

Ahhhhh I get it now
Now this chip doesn't retard timing under boost or anything I'm assuming... So its a waste for me ill just stick with safc2 until I get some more dollars for microtech + tuning. Thanks kevin

 

The timing map may be changed, there's no way to know. Its most likely more fuel changes than anything else.

 

Thank you for sharing your experience with us all. I am getting a wolf 3d v400 plus stand alone for ratarywarehouse.com I am not going to go with a chip or knightsport tuned rom ecu. The information you listed above does help me to understand more about what will need to be done to my car once I have the engine, wolf3d and injectors and upgraded fuel pump installed. I am going to be posting in the Fuel management section to see if I can get help to tune my wolf 3d ecu when it is installed. Thank you much for the useful info.