nitrous 100 shot questions

[luckybmw]

i'm going to a 100 dry shot on the zex system. the engine can take it no problem. it has nearly optimum compression for nitrous. my main concern is the fuel system. should i get an inline booster fuel pump? can the stock fuel pump handle it all alone? all you guys running superchargers and turbos.... what fuel pumps are you guys using? do i need to upgrade my stock fuel injectors? thanx for all the help guys. see you all at the BBQ june 30 with drag radials and a full bottle

don't worry randall+dave, i promise to be good

[luckybmw]

should i get a booster or a completely new inline fuel pump. if i get a new inline fuel pump how do i go about bypassing the old in-tank one? i am thinking a booster will be my best option because i can make a switch to have it on only when i want to (on the bottle) and still keep my stock fuel pump. any help from all you forced induction guys will help greatly. thanx everyone.



ZEX Booster Fuel Pump Kit
To avoid running your performance engine lean, you need to "amp" up your fuel system. The best upgrade to use is the ZEX Booster Fuel Pump Kit. It is installed inline, so there is no need for the mess of dropping your fuel tank. Unlike other manufacturers who just sell you a pump, the ZEX Booster Fuel Pump Kit includes all the hoses, hose clamps, wiring, etc. you need for an easy and clean install. The kit provides the potential to boost your fuel system flow capacity up to 650 hp, even on high fuel pressure turbo, supercharged, and dry nitrous system applications. So, "amp" up and ensure that you always have the fuel you need to beat your competition. This high capacity fuel pump is an inline bolt-on and it fits any high performance automotive application up to 650hp.
$191.20



Electric, 500 hp applications, 45 psi, fuel pump
Accel's 400-HP fuel pump is meant for a fuel injected (45 psi) application and is good up to 500 horsepower. The pump is designed to be installed in-line and even comes with its own mounting brackets.
$145.69



Universal, 50 gph at 70 psi rating, T-Rex fuel pump
All fuel pumps are not created equal. As fuel pressure requirements increase, fuel flow drops. This is particularly important with Vortech superchargers, as they raise fuel pressure in proportion to boost to deliver a correct air/fuel ratio. That's why Vortech created this T-Rex series fuel pump. It's specially designed to maintain a high flow rate at elevated pressures and to keep your boosted engine supplied with enough fuel to make serious horsepower
$195.69



Multiport EFI systems require a stable fuel supply to maintain best performance throughout the engine’s rpm range. This high pressure and high flow fuel pump features a roller vane pump mechanism which is extremely resistant to clogging and jamming. The pump mounts in-line (out of the fuel tank) with two supplied cushioned clamps for a quick and sturdy installation. The nipple inlet is 3/8" with a 5/16" outlet. The wire terminals feature brass studs for secure connections. Made in the USA, the pump is ideal for use as a booster pump for turbo or nitrous oxide applications and will support up to 500 hp.
$121.38

[Brad D.]

You could get my fuel injectors from my M3...I believe they flow quite a bit more fuel than the ones you have now.

I have the stock ones if you want them.

[Seedster]

Fuel injectors are definitely gonna hold you back. The 325's ones were pretty wimpy (no offense). Not sure in the difference between the stock ones and the 96+ M3 ones (Brad's). Also, dropping in a new fuel bump shouldn't discourage you. From some tutorials i've seen online...it REALLY isn't that hard. You can do it from underneath the backseat from what I remember. No need to drop the tank (dont quote me on it though...for the life of me I cant remember if the top of the gas tank is visible from underneath the rear seat or not....or was that my buddy's accord?? ).

[luckybmw]

thanx guys. anyone know the flow rates of 325 injectors vs. 3.2 m3 injectors? also if the m3 fuel pumps flow more than my 325 fuel pump?


brad- if you got those injectors still i'll take them off your hands, just tell me how much you want. also, what fuel pump are you using for your turbo?

joey- if you read this what fuel pump are you using for your AA turbo?

saeed- you are right about the fuel pump under the back seat. it is cake to replace. but i just don't think it can handle what i want it to do. i definitely don't want to be the first to find out it can't hack it... $5,000 lesson

[Scho]

Luke, have you called or e-mailed AA? They are pretty helpful and usually get back with you pretty soon.

Brad D., what spark plugs are you using?

[Brad D.]

Originally posted by luckybmw
thanx guys. anyone know the flow rates of 325 injectors vs. 3.2 m3 injectors? also if the m3 fuel pumps flow more than my 325 fuel pump?


brad- if you got those injectors still i'll take them off your hands, just tell me how much you want. also, what fuel pump are you using for your turbo?

joey- if you read this what fuel pump are you using for your AA turbo?

saeed- you are right about the fuel pump under the back seat. it is cake to replace. but i just don't think it can handle what i want it to do. i definitely don't want to be the first to find out it can't hack it... $5,000 lesson

Lucky-

You can pick them up from MechTech...I'll sign a letter for you to take over there to get them, but I refuse to go myself. I left them there with the understanding that I could have them back anytime I want.

The factory fuel pump doesn't need to get upgraded, it is good for (shit I can't remember exactly) but I think 90psi? 100psi??

Can't recall...all I know is I am running the stock fuel pump and it handles the 35lb injectors I have fine.

Factory M3 has 19lb injectors.

Scho-

I am running Iridium plugs.

[luckybmw]

thanx brad. i'll definitely take you up on those injectors. if your stock injectors are only 19lbs., mine must suck ass. my stock fuel pump needs replacing just because it is old and i don't trust it. i'll find out from the bmw dealership whether or not the m3 pumps flow better.

scho- i'll email AA and see what they say. thanx.

[Eric]

3.2L injectors are 21 or 21.5lbs
3.0L injectors are 18 or 18.5lbs
2.5L injectors must be 18lbs or less. my guess is you should be fine with brads old injectors, or you can get BOSCH 26lbs injectors from Ford motorspor for like $200 this also requires a cutom mapped chip, and since you need a custom burned chip you might as well get a 3.5 inch HFM from a 95 540i, this will give you better throttle response.

[JCM3]

I thought the 94-95 m3 and all the 325 had the same primary fuel pump. Definetly go w/ the larger injectors if you plan on going w/ that high of a dry shot. I personally never went over 80shot on my m3. 100 shot on a 325 is like (53%) NOS recommends not going over 40% horsepower from nitrous (that would be an 80 shot). You will need a custom chip to run the larger injectors and maybe retard the timing. Put in some 1 range colder copper plugs also (NGK R5671a-7) thats what I use. The fuel pump can handle 90+ psi (according to Corky Bell).

[Scho]

On the topic of nitrous, what spark plugs should I get to work when I am on and off the bottle. I was looking at the NGK's that Seedster has, but I am not sure if they will work on my 97 M3. Anyone have any suggestions?

[luckybmw]

Originally posted by Scho
On the topic of nitrous, what spark plugs should I get to work when I am on and off the bottle. I was looking at the NGK's that Seedster has, but I am not sure if they will work on my 97 M3. Anyone have any suggestions?

call summit racing and get the 1 stage colder NGK plugs. they are cheap and the best for the bottle. just tell them your year make and model and they will tell you what you need.

luke

[Brad D.]

Originally posted by Scho
On the topic of nitrous, what spark plugs should I get to work when I am on and off the bottle. I was looking at the NGK's that Seedster has, but I am not sure if they will work on my 97 M3. Anyone have any suggestions?

When on the bottle get the ones Lucky was talking about, off the bottle go with the Iridium plugs. I have had nothing but good luck with them.

[Eric]

brad - where can you get those irridium plugs? think i'll see any kind of improvements on my basicly stock 3.0L?

[Brad D.]

Originally posted by Eric
brad - where can you get those irridium plugs? think i'll see any kind of improvements on my basicly stock 3.0L?

Dunno...I got them basically for free because I bitched so much at shitty mechtech. No, you won't see any improvements on your car.