bheiman

i am getting a stand alone engine management unit called megasquirt, it will take care of everything.
http://www.msefi.com

BobfisH

that may be the case bheiman, but it still doesnt change the fact that people are posting irrelevant comments.

As i said, cars need two things to make them faster. More fuel and more air. Gain 50hp by upping the boost or by squirting 35 shot of nitrous, the end result is the same as is the reliability. Just get it tuned to fuel correctly, watch your boost and do it properly and it doesnt matter what ECU you have, because the wet kit provides the fuel.

the megasquirt will however be useful for retarding the ignition.

Just wanna check, when you say wet kit - you do have a separate solenoid for the fuel dont you? (i.e the nitrous injector injects fuel and nitrous, not just turn up the fuel pressure?)

Mr rx-7 tt

iTrader: (5)

Nos on a turbo rotary for street use is stupid. It is less reliable, will cost you money to fill it up constantly and you have to plumb all the lines/eletcrics etc.. Buy a dp, ecu etc.

BobfisH

Mr RX-7 TT What is less reliable about NOS? Do you have a NOS kit? Have you ever used one before? have you ever tuned a NOS kit?

just curious as to why you say its less reliable. Fair point about cost to fill it up etc, but all nitrous does is add more fuel and more oxygen, which is EXACTLY what turning up the boost and getting an ECU does.

bheiman

well here is a pic of my engine bay, it is kinda hard to see but you can see the nitrous system

BobfisH

ok, i see two injectors with two lines going into each, correct? If so, thats one nitrous and one fuel line for each - so it does look like a proper wet kit.

Some kits claim to be wet but all they do is increase the pressure the FPR sees forcing the fuel pressure higher and making more fuel be injected per duty cycle. This is a bad way of doing it and almost guarentees a problem on piston engined motors let alone our sensitive rotaries.

If you want to be extra cautious with your nitrous get an aftermarket knock sensor, EGT gauge and AFR gauge (in that order) to allow you to see when (if) a problem occurs.

I personally wouldnt run nitrous on my rotary, but there is no reason you cant - as i say, it does just the same as upping the fuel and boost via a boost controller and ECU.

Mr rx-7 tt

iTrader: (5)

Uh, yes. I have been building rotaries, all types of ports and forced induction for over 20 years. I ran a 200 shot on my car for years.


Delivering and metering fuel and Nos on a rotary is not as accurate as using a tuned ECU and turning up the boost. There is a reason racers turn up the boost and use small shots of Nos for spool on rotaries.

fastcarfreak

I would also like to give you my take on the ecu you plan to buy. Just remember, you get what you pay for. If you buy and ecu for only 400 dollars, expect it to only perform like a 400 dollar ecu. I for one feel, your ecu is the absolute worst part of the car to go cheap on. It pretty much controls whether your motor runs or dies. I dont think i have actually heard anyone using the megasquirt ecu on the rotary. Im sure people do, i just havent seen it. If you really want the car to last, get an ecu that is been proven time and time again on rotary engines. The power fc is the most common ecu people use, if your new to the stand alone world, this is your best bet. I ran it for over 2 years before i switched over to microtech. I liked it, i just wanted something a little better. Some may argue that the power fc is better, i guess its all opinion when it comes to these better ecus.

Adam

rotorbrain

the reason for an ecu, bobfish, is because there is more at bat than just fuel and POWER. . . theres a safety margin that needs to be touched as well. the programmable EMS is the key.

a megasquirt is a good setup. i think its a great concept. . . for piston engines. the megasquirt is workable on a rotary, yes. . . but not completely, YET. it WILL work, just not as WELL as a higher dollar one. thats the case across the board though. if the megasquirt is the one youre getting, then just do it. . . and WAIT to turn on the nitrous kit.

ive seen your posts on this thread and it looks like that is the information youre looking for. . . hope that helps.

also, about EMS choice. MAKE SURE that the EMS you use is one that is widely used and tuned in your area. as in my region. the EMS of choice is the powerfc. more users for it in this area, therefore, more information. steve kan comes to this area a lot, so its the obvious choice. yes, steve can tune more than the powerfc, but the combination of the two factors makes it the optimal choice.

paul

XSTransAm

yeah it dosent matter what ecu you have until it spikes your boost and you hit overboost fuel cut... Or it advances your timing until your gas knocks.

kaboom!

with a aftermarket ecu you can control these factors, In anycase though i always reccomend running a higher octane fuel when combining turbos and nitrous.

cbf246

even if it is a WET kit. the kit is only ment to add the neccessary fuel to create an equal mixture of nitrous and fuel. the kit does not add the fact that there will be a boost spike and extra air. if you upgrade the fuel jet to compensate for this, then yes, use the kit. but still get an ecu. itll help with the engines life, and monitor all other parameters.

BobfisH

xstransam, yes i suppose overboost fuel cut is possible and NOT a good situation to be in...but why would the timing be advanced?

rotorbrain

i think hes referring to the timing being TOO advanced on the stock ecu to handle that much boost PLUS nitrous.

lets say youre making high boost runs. . . and you have an air/fuel ratio of 10:1 at WOT. youre trying to achieve 11.5-12:1. . . obviously you reduce the amount of fuel entering the engine. . . well, what if your timing is too far advanced for the application at hand? egt's rise. . . because of that. . . the novice tuner might not notice this. . . and probably wouldnt have an EGT gauge handy. that = kaboom

bheiman

i have a egt
need an afr gauge.

Basically the reason for me going with a megasquirt is there is a guy around here that really knows rotories. Also, there is a guy here that has been making megasquirts for many many people. He is the person that complained enough to get the leading and trailing sparks into the megasquirt system. He hasnt had a chance to do a rotary yet because the guy that he was going to do is selling his. He normally charges 1000$ for it. But he is giving me a good deal for the experience. Also he has made a promise that is anything breaks he WILL pay for it. He knows that being his first rotory it may cause problems, but he has been waiting for the oppurtunity for a long time for an fd.

Btw he is also going to show me how to do it, so i can charge 1000$ a pop for building a ms and tuning it.

XSTransAm

That deal is a disaster just waiting to happen. Ide rather buy a pfc for 800$ and be done with it. no need to re-invent the wheel on a 12 year old platform with many cheap proven technologys.

rotorbrain

haha, good luck with charging. . . unfortunately, a brand new tuner wouldnt be touching my car. hahaha. . . and i wouldnt expect anybody to let me touch theirs in that sense.

youre on the right track, however. getting something with good knowledge base in your area is key. . . keep it going and have fun.

furthermore. . . let us know how the megasquirt works on the car!!!

cbf246

just make sure that you have another car to use if you blow your engine. thats all i gotta say. good luck.

bheiman

i prolly wont use it. I just though it would be cool to say it is in working order, just not really use it.

The ms setup, is going to be cheaper than i thought even. After talking with him, it is going to cost me hardware and a fe misc things. Thats it. Now if i like it i can obviously give him a few bones.

SDRacer87

Wow.

GUITARJUNKIE28

what?
if i'm gonna put nitrous on my car, it'll add at least 3-digit horsepower! but then again, i can tune for it, making a 100 or 150 shot safer than a 35 shot with no tuning.

Fd3BOOST

iTrader: (7)

I didn't have time to read through this thread but just wanted to add that Ray Crowe at Malloy sprays nitrous in his Fd. I don't know the details but I am sure he would love to elaborate if you called him at work.

pluto

yea, ray does run nitrous in his FD. but he's only running stock boost and on top of that, stock ECU. Last i remembered, he was spraying a 50shot.

lopedl

iTrader: (1)

I think all of you have a good postulation about nitrious on an FD, but that is just it postulation. I have yet to hear anyone say they blew their engine because of a nitrious shot, perhaps the reason is not many have had the nerve to try it.

Although I can't say the tuner you are dealing with is reputable. But if I had an worn high mileage engine, and the 100% certainty that if anything broke I would get compensated, I would play gopher for everyone else. But it seems like you have more to lose since your engine is in newer shape.

Sled Driver

iTrader: (9)

Wow....................

4 pages of replies debating NOS & your not really even gonna use it.

Just brag to your buddies that you got it?

Got this from their site......

http://www.megasquirt.info/

"MegaSquirt is an experimental Do-It-Yourself programmable electronic fuel injection controller"

Hummmm............So it just a piggyback (fuel only) controller like the Apexi AFC?
It's use has been debated years ago & deemed unacceptable for FD use.


A chipped ECU also controls timing, fuel cut, along with increase boost.
The PFC replaces the ECU with a stand alone unit that controls ALL functions.

I would be more concerned with the fact that your car is only putting out 250hp with all your mods (minus the ECU upgrade).

But when I reread you statement I realize your not interested in actual performance., since your not going to use it anyway.

You can buy a sub woofer that looks like a NOS bottle. Your friends would never know the difference & it would actuality increase the performance of your car.

Rx7_Nut13B

iTrader: (1)

All that and not putting down more than 250hp