Mods are in sig, but in short my motor is a 355 w/ eagle forged rods, Srp forged pistons, 2 bolt mains with ARP studs. Im seeing 11 psi on my d1sc and i want to add n20. How big of a shot can I run and be safe? Will I need to upgrade my fuel system? Right now I have a 255 lph intank pump, vortech inline booster pump, 42 lb/hr SVO's, and cartech FMU.

 

You should be worried about fuel supply and also the SRP's you have in there. The 255 and inline vortech is fine now, but may not supply enough fuel volume when your spraying it. You would be better with dual parallel 255's vs the series pumps. The 42's should hang, but i'd rather have 60's in there. As for the SRP's, have a real good tune, cause they won't hold up well to detonation. A 50 shot would make a world of difference at the track. Don't forget to pull some timing out if you spray it.

Ken R.

 

I have to disagree with roguedriver. I believe you are already starving for more fuel pump with your current setup. 400 RWHP is the average mark where most guys need to run a second 255 lph fuel pump. I would HIGHLY reccomend doing that right away before you add the spray.

After you have a second fuel pump, (depending more or less on the specifics of your engine build, CR for example) I would say you could safely run between a 100 and a 200 shot.

 

I have 2 fuel pumps...a 255 lph and a vortech inline pump...keep in mind i only put down 450 rwhp at 6000 feet. I have eagle h beams, forged srp's 9:1 compression. Stock crank, 2 bolt mains w/ arp bolts

 

I wasn't aware you were running a booster pump with the intank pump. The booster pumps are supposedly good enough to do the job, but if you are planning on juicing it, I still would say go with the dual in tank 255 lph pumps. The 9:1 CR is good for more power though.

 

So im safe to jump to a 100 or 125 shot? Im only worried about breaking stuff at this point..supposedly if i spray a 100 shot, it should be good for anohter 125 rwhp on a boosted engine?

 

I ran an intank 255 and inline NOS booster (another 255) on my 10psi 150 dry shot 350 setup. It ran over 500 hp and didn't have a fuel supply issue till i stroked it to 383 and 14psi. The problem with running an intank and a booster is that it will only flow the volume of either the highest (or lowest, can't remember) pump. It does not flow the same volume as 2 pumps in parallel, so you'll run dry when the demand is high running a series setup. Do a search. Lots of posts about it. If i remember right, injuneer explained it pretty good.

Ken R.

 

Some of your questions might be better asked in teh N20 section. I am not as knowledgeable of the spray as I am of supercharging and motors. I would say that your motor would take it given that you ran a second in tank 255 lph fuel pump. Now, depending on what type of N20 application you would run (wet or dry shot for example) might depend on if you need to up your injectors at all. As far as getting 125 RWHP gain out of a 100 shot, I doubt you would see that much increase. The best nitrous application I have seen is a direct port application (I believe NX has the best setup). With a direct port application you might gett 100 to 110 RWHP gain out of 100 shot, but keep in mind that the best you would regularly get out of a N/A car would be 100 RWHP gain out of a 100 shot. The only reason you might see a snidge more on the boosted side is that the juice will help cool your IAT's which would be higher as being a boosted car.