Need boosting help...

[elwesso]

Alright, heres a quick disclaimer...

1. I am a n00b to boost2. I know Im posting in the wrong forum3. Im posting here because a certain admin recommended that I do this

OK.. now on to the issue at hand...

As some of you know im planning on running a little SC on my Q45. The setup is not to be questioned as this is the route im going......

Anyway, the only other person to do this is Dr. Rex, and this is the email I got from him.....

Wes: I had Jim Wolf do a ECU upgrade. I'd use this for ignition and fuel, but they set everything up rich and I'd use an aftermarket fuel interface module to fine tune the set-up on the dyno. Mine ran flawlessly. I still have it as a piece of history.... Best of luck, Rex

My plan for the ECU was to send it to JWT and have their boost map installed. Straightforeward and nothing needed as far as tuning on my part... The reason I liked this, or at least it seemed best, is because its a MAF based boost program that adjusts timing and fuel... I want to make this as safe as possible...

However, after recieving that email, I talked to some people (or person ) and the JWT doesnt really seem like the best way to go.. Obviously I want this as optimal as I can get... Plus not having to wait months for a simple ECU reprogram wouldnt be too bad either! So this said person recommended to me the APEXi SAFCII or something like that...

Right now, I have the standard JWT upgrade with the nitrous module (irrelavent)...

What im getting at here, is I want to know the best way to tune this thing.. I was hoping JWT would take away my woes but I dont think thats gonna do it... Plus, adding other mods (such as headers) would be nice to be able to tune for that as well.......

After reading some brief information on the web, it seems like its gonna be best for me to keep my JWT ECU the way it is and run a piggy back FMU or something... Im merely asking for your advice on this.. Im very much a novice when it comes to boosting and all that stuff, and I was hoping in said noviceness that the JWT would take care of everything... No such luck, eh??

THank you KA-T people for your knowledge

[DRIFTEADOR]

for simplicity, as long as you aren't going for more than double the power of what stock injectors can provide (your stock injectors can handle quite a bit btw), I would reccomend piggyback fuel managment. A safc works fine in regards to fuel tuning but gives no control over timing. Greddy emanage, imo (maybe a little biased), the next best thing to a standalone ecu. that'd would be my first choice. I mention simplicity because with a standalone system you have to tune for starting, idling, a/c loading, part throttle accel/decel, and everything else concerning closed loop operation. with piggyback (stock ecu assisted) control, on the other hand, you only have to worry about open loop mode (high load/WOT), the stock computer uses factory nissan settings for everything else. Don't get me wrong a standalone is definitely the way to go for big power, but this is your first boost setup. something as simple as not having a check engine light can turn into a big headache (dont ask me how i know ). plus the option of upgrading down the line is still available. jwt/enthalpy/bikirom, which are a combination of standalone/piggyback, would be the best option if they were assosiated with local performance shops so that their chips could be dynotuned to a specific setup, but they aren't, at least not yet. one fits all doesn't work for me.

[SeVa-S13]

As said above, E-Manage is the way to go for a good piggyback setup. The SAFC is overpriced and underpowered.

[elwesso]

I appreciate the post drift..

The thing that i would like to see happen is just for me to retain my stock JWT ECU (so call it a stock, i like my raised redline) and be able to tune this thing to a certain degree myself...

I am not going to exceed the HP of my injectors, the 370CC Q45 ones can hold something like 500hp or something?? I wanted to max them out at like 90% duty cycle since the Q injectors are fragile.....

No way I want to deal with a stand alone ECU.. Im looking at approx 400HP at 6lbs of boost, so im not running that much power. i know a guy in austrailia who hsa a motec ECU.. Definitely the best choice, but his ECU cost $4000!! Thats more than the car is worth... Just too much work and really since im running such low boost its not really worth it..

I suppose id have to go somewhere where a tuner could get it working good... I like the ability to "fiddle" with things! I suppose "tuning" the car would be a completely different thread...

I need to get down tothe basics though.. how does it wire in?? do you splice certain wires on the factory harness??

[DRIFTEADOR]

yes, it splices into your ecu wiring harness. heres a write up i made for a 240 to give you an idea. zerothread?id=113767

you'll need to find a copy of your own ecu pinout for the correct wires to splice into.

[Import_Ant]

It seems like you are pretty much DIY so I'll toss this site in the mix for you (lets you tune your own roms and install them, I think there's an adapter for real-time tuning as well)

http://bikirom.com

http://forum.bikirom.com

good luck with the setup.

[elwesso]

yes, it splices into your ecu wiring harness. heres a write up i made for a 240 to give you an idea. zerothread?id=113767

you'll need to find a copy of your own ecu pinout for the correct wires to splice into.

Thanks! I did notice one thing... How would I control 8 cylinders??? Is there an e-manage that allows me to do this?

I have the FSM so this shouldnt be a problem...

Thanks for the links ant..... That looks a little to sophisticated, and Id like something that allows realtime deals.. I wonder, if with that setup, I could have htem make a copy of the JWT boost map and then be able to re-flash a new code??

The problem with that sort of thing that ant posted is if its compatible with the Q...?

[fiznat]

Wes,

Since you already have the JWT ECU but you are also looking for some "tinkerability," you can piggyback the S-AFC on if you like to enable yourself to "fine tune" the engine a little bit. The ECU will give you a solid, safe base to work from-- while at the same time you can lean it out a little if you like with the S-AFC and do that tinkering that you've been looking for.

The S-AFC alone is an O.K. idea, but keep in mind that it is not capable of tuning timing at all, it only works with your fuel maps. You could get a S-AFC and then something for timing like perhaps a MSD BTM (which automatically retards timing based on your actual load: retarding per psi boost), the combination of which would be very effective and allow you to mess with it some. This kind of setup (for optimal performance) would most likely require tuning on a dyno with a wideband, even though you can probably get away without it.

The next step up would probably be the Greddy E-manage, although I am not sure whether it is available for your car or not. This system is like a baby standalone: you get the map and you manually tune in the timing and fuel based on load and RPM. This setup would definitely require wideband dyno tuning, but it is also the most flexible and probably most effective setup within this price range.

Basically it comes down to (1) how much you want to spend, and (2) how "DIY" you want the system to be. The more DIY you get, the more power you will probably get (assuming it is done well), but the chances something will mess up will also increase. The less DIY you get, the safer (and easier to setup) the system will be, but your peak power will go down.

[onosqv]

Thanks for the links ant..... That looks a little to sophisticated, and Id like something that allows realtime deals.. I wonder, if with that setup, I could have htem make a copy of the JWT boost map and then be able to re-flash a new code??

I believe JWT scrambles their maps so that they are not easily downloadable and re-flashed to another ecu.

[elwesso]

I believe JWT scrambles their maps so that they are not easily downloadable and re-flashed to another ecu.

That would make sense..

Anyway.. I want this to be nearly fool proof. Im not an idiot so i think that I can do this to a certain degree.. This forum should be able to guide me on how to do it.....

Id say that Id want to have it tuned to about 90-95%.. I can deal wiht 5% left on the table for safety... I gotta have some fallback...

It looks as if I want the apexi thing if get the JWT boost map.. however IM thinking it might best to keep what I already have....

Will I be able to change the rev limiter with any of these piggy back ECUs or am I just looking at controlling fuel and timing. so that being known, theyre all roughly the same price, it seems completely redundant to have the JWT BOOST map (not ot be confused with my JWT upgrade i have now) and a piggy back.....

SO now the trick is to find one that is compatible wiht the VH45DE.. Ideally Id like something where I can bolt on the supercharger, and it will be safe, and then I can tweak it..... With my JWT upgraded ECU (non boost) do you think that it will be fairly safe? Basically I want to start where its OK and nice and safe, and then i can tweak from there on...

FYI max boost id be running would probably be around 7lbs

[elwesso]

I wanted to sak you guys about these things

http://www.xtronics.com/

The EPROM emulator and programmer.. What do you think about those things???

[Checkered-Member]

There are performance shops that have a dyno on site, that can install and tune the e-manage, shouldn't cost THAT much, even if it does everything will be done professionally.

[get_up_mark]

will greddy emanage be able to handle my 50lb injectors? i believe that is 550cc might be slightly more than double

[Checkered-Member]

will greddy emanage be able to handle my 50lb injectors? i believe that is 550cc might be slightly more than double

yes

[get_up_mark]

thought so. thanks

[DRIFTEADOR]

I wanted to sak you guys about these things

http://www.xtronics.com/

The EPROM emulator and programmer.. What do you think about those things???

they're great once you have the hardware to use them. thats something similar to what jwt/entalhpy use and what you would need to use if you went with bikirom or any other dyi software if you wanted to create your own maps from scratch. thats way more advanced though. before you burn a tune you need to have an erasable chip installed in your ecu. soldering is required, that is if there is even a daughterboard available for your ecu. not to mention you need to have a good understanding of fuel and ignition. emanage and safc adjust in percentace differences from stock. not too much guesswork. with dyi chipping, you insert your own values from scratch. here's a few websites on diy chipping to give you a better idea of what is needed, http://forum.ztechz.net/, http://www.sr20tuning.com/theo....html, http://ztechz.net/id10.html.