[Mister Hymes]

What is the biggest shot of juice (dry) I can use safely on my non p.i. 4.6 with stock internals and 19lb injectors?

[1SLO85]

Originally Posted by Mister Hymes

What is the biggest shot of juice (dry) I can use safely on my non p.i. 4.6 with stock internals and 19lb injectors?

I would say 75-100 shot.

[blu89hb]

175 with the fuel presure uped and colder plugs w/ some race fuel

[Nite-Mare]

Originally Posted by blu89hb

175 with the fuel presure uped and colder plugs w/ some race fuel

Perhaps he would like to keep it streetable and use pump gas... 100 is supposed to be perfectly safe.

[blu89hb]

Originally Posted by Nite-Mare

Perhaps he would like to keep it streetable and use pump gas... 100 is supposed to be perfectly safe.

weak

[Nite-Mare]

Originally Posted by blu89hb

weak

Bwahahaha!

[Nighthawk]

the 2v motor's bottom end is usually good until around 400 rwhp. keep it under that to keep it safe. that being said, get there any way you want to, just keep a good tune and good gas in your car.

just add a high pressure fuel pump to blu89's list.

[CrewChiefLite]

A pretty good rule of thumb is to calculate the percent hp gain from nitrous...For example, on a 260 hp engine, a 100 shot is giving a 26% gain, which is pretty safe. A 150 shot is a 57% gain...it's not really an exact science, but it's pretty smart to have your hp gain from nitrous less than 40% or so...

[Don]

Make sure to have it tuned on a dyno and be conservative on the tune (rich). Buy a MSD digital window switch if it is a standard & let me know if you have trouble installing it. Get colder plugs and run race fuel!!! Hit it and hang on!

[SALEENT76]

Originally Posted by CrewChiefLite

A pretty good rule of thumb is to calculate the percent hp gain from nitrous...For example, on a 260 hp engine, a 100 shot is giving a 26% gain, which is pretty safe. A 150 shot is a 57% gain...it's not really an exact science, but it's pretty smart to have your hp gain from nitrous less than 40% or so...

Wow she is smart!!!!! LOL

[Mister Hymes]

Thanks for all the feedback. Here's the major problem I have. SCT hasn't made my calibration code available yet so I can't do a tune. Would I be able to do it by "raising" the fuel pressure with a adjustable regulator. I allready have a 155 lph fuel pump? I'd really like to do a 125 shot (at least 100) due to how poorly these heads flow. Any suggestions?

[CrewChiefLite]

Is there a local dyno you can tune at?

[Mister Hymes]

Yes, but they use SCT software.

[Nighthawk]

get some good gas and then put it on a dyno to make sure your a/f is in check. You should be able to get a decent tune just by adjusting fuel pressure. You'll have to watch your timing with a 125 shot, either race gas or find some way to retard the ignition timing. (timing adjuster?)