Apex injectors

[mbarryracing]

I am running the 392 pump, so has more flow at the higher pressure but not totally comfortable with the reliability of this pump, though.
Dave, what is the next option? Wouldn't mind eliminating the in-tank pump and going with just one, less draw and less to go wrong. Inline was just for convenience at the time.

 

[mulot30th]

Stock new fuel system on some will go to about 300hp
With pump and and bigger injectors at seas level I have seen 363 HP on stage 1 turbo.
18 psi boost
It was the end of making anymore power and I don't think stock motor would take much more.
Used sled come in with stock pump and can't get 270 hp !!
Seems like pump gets weak over time.

363hp, stock engine?


How much time before it goes kaboom?

 

[mbarryracing]

Won't if you feed it "special" fuel, or meth, to accomodate the compression ratio. There are some sleds out there running bigger boost then that on the stock engine. I personally wouldn't push it much farther, though...

 

[mulot30th]

Ive personnaly pushed a stock engine to 300hp with strait c16, and while engine was running pretty good, the engine block was completely scrap....

Still was making good power, but I just dont think I would run this for longer than 600 to 1000 ft pulls.

 

[zross1]

I'm not against larger injectors, I would put them in if I didn't have other means of injecting fuel at higher boost levels. My previous post was only using my stock injectors though. Walbro 255 is good for over 400 hp. I dynoed 475 AWHP on a stingy mustang dyno with my old Eclipse with one single intank walbro 255 on pump gas.

 

[mulot30th]

I'm not against larger injectors, I would put them in if I didn't have other means of injecting fuel at higher boost levels. My previous post was only using my stock injectors though. Walbro 255 is good for over 400 hp. I dynoed 475 AWHP on a stingy mustang dyno with my old Eclipse with one single intank walbro 255 on pump gas.

Same thing here, the walbro 255 worked up to 550 whp on my ls1.... but then its starting to drop pressure...


Using a 'boost a pump' we have been able to go up to 670whp on a supercharged ls1 using the same 255 walbro.

 

[TurboMatt]

I've never had my sled on a dyno, but running 97g of weight 100+mph track speed @ 20 psi at 10500 ft elevation up a mountain I think it's making decent power. With a Walbro 255 I'm seeing 12.5 a/f ratio. I've never had it over 20 psi but I think I could to at least 22 with the stock injectors. I'm going to find out over the weekend just how much boost I can run before running out of injector

Are you using stock fpr too or rising rate fpr?

 

[mulot30th]

By the way, I don't exactly know how this translate to 3 ramps ... but I easyly push 83 grams of ramps X 4 ramps on my turbo apex at 17 psi almost hitting rev limiter all the way.

 

[sneakattak88]

ok , Im confused,( doesnt take much)i have a inline pump now to add fuel, but lets say I decide to go with the bigger injectors wont that messes up all my A/F again, and start all over, Am I not going to be dumping that much more fuel? I understand its safer then adding a pump ,,and on the dyno once we added the pump the number showed we were NOT dropping on the fuel.. but if its recomended to go with bigger injectors I would ,but not sure what it would do to me,,, and be nice to me if this all sounds silly IM NOT TECH just a guy that wants whats best for my sled..

 

[TurboMatt]

ok , Im confused,( doesnt take much)i have a inline pump now to add fuel, but lets say I decide to go with the bigger injectors wont that messes up all my A/F again, and start all over, Am I not going to be dumping that much more fuel? I understand its safer then adding a pump ,,and on the dyno once we added the pump the number showed we were NOT dropping on the fuel.. but if its recomended to go with bigger injectors I would ,but not sure what it would do to me,,, and be nice to me if this all sounds silly IM NOT TECH just a guy that wants whats best for my sled..

Yes, if you put bigger injectors in you sled it needs to be re-tuned because they will be adding more fuel. Also, normally if you are at the point were you need bigger injectors you also need a high flowing pump as well.
You only NEED bigger injectors if you NEED more fuel ie. your stock injectors are maxed out.

 

[insane]

Have the stock injectors bored out by Hurricane and then you can keep the stock fpr and run your fuel injection at less duty (more efficient). Mapping becomes simple with a 2-3 bar, if you can data-log one or two passes will get you pretty close. With the high flow pump, bored injectors, stock fpr, the fuel system is much more linear to the amount of boost. Only place I had to mess with the actual map was at starting idle, probably still could have compensated with my 3-bar. From 2500 to 10,800 done easily with 3-bar on linear graph on a dynojet pc-3, I think the RB-3 is very similar.

 

[HURRICANE]

Insane
That was well said.Guy's,that's it in a nut shell.