1quickTransAm

iTrader: (4)

I'm about to spray my LT1 for the first time tonight and wanted to double check on something. I'd like to get up to spraying a 150 shot as that seems like plenty to have fun and many people seem to say that is a relatively safe limit for LT1s, but what is the limiting factor for the 150 recommendation?

I already have mild engine work (hot cam kit and bolt ons) and put down 345 rwhp as is. I've done pretty much all the basic nitrous safety stuff (FPSS, BR7 plugs gapped to .035", wideband, Mallory 685 to pull timing and window switch) and even upgraded my fuel pump with the Racetronix unit and hotwire kit.

Based on the above and if I am conservative with my timing and AFR, should I have any reasonable concerns on a 150 shot? If so, what components are in question?


*I'm planning on starting off with a 100 shot and pulling 5 degrees of timing (mail order tune has timing advanced 1 degree before pulling).

87silverbullet

iTrader: (11)

Don't use those plugs. Get some br6ef if you are only going to go 100 shot or step up to the br7ef for the 150. You are right with your timing but may want to take out 1 or 2 more degrees then add it back in to see if it wants it.

150 will not be a limiting factor in anyway. I had guys spraying 250 hits on LT1's many years ago.

1quickTransAm

iTrader: (4)

I'm using the plugs that Nitrous Outlet recommended for me with the 150 shot goal.

Question about timing. I know what happens if you don't pull enough, but what happens if you pull 1° or 2° too many? Just a slight loss in power?

87silverbullet

iTrader: (11)

Yup and I'll take that any day over a blown motor.

lncboytre_d

Start off pulling 7 degrees of timing, work your way back down to 5... if you need to go that far. The good thing about the Mallory is you can pull in timing in tenths, not sure about the MSD. I would use NGK br6ef's if it were me. Honestly, you could use the TR6's or 7's and be ok. Many have done it before the internet was flooded with information using better technology/results and the reliablity of using a non projected plug. I used the TR6's for at least 6 months with no ill effect or detonation. You will definately be able to see the plugs are operating at a high temp that using a non project plug.

As for the power jump from 100-150, you will not be able to hook at all! You will love it and hate it, But from a roll it will pull pretty hard.

Mail order tunes are usually on the rich side, so you may have to adjust your fuel jets to get it to a real "safe" level. Other than that, hook it up and have fun.

Neal@NitrousOutlet

should be br7 not tr7. might have been a typo or letter mix up.

Neal@NitrousOutlet

some of the limiting factor is the intake manifold. The manifold starts getting turbulent. The mixture of nitrous and fuel can start to get bad after 150. It can be done but you have to watch your plugs.

1quickTransAm

iTrader: (4)

Yep, was a typo. I've got BR7EF plugs in gapped to .035"

1quickTransAm

iTrader: (4)

So there are no internal components that are being overly stressed at a 150 shot with a safe tune?

SHDY 5.7

Don't over think bud. Ur being more then safe. Of course,there's always a chance of issues,but that's drag racing.

I had a 96 formula,that I sprayed 150 too,with Nothing but a plug change,and a set of slicks. Stock tune,no timing pulled,Nothing. I sprayed that car all year,went 11.60 @ 114 consistently with no issues at all.

My brother had a 97 z,that he sprayed 150 to with the plate kit,and sat identical to me. No issues.

Ull be fine.

God I miss this car:

1quickTransAm

iTrader: (4)

^ That's what I like to hear!

SHDY 5.7

On the z,we did a converter,long tubes,true duals,and went to the 200 pills,the car went 11.0 first pass,and busted the 10blt on the 2nd pass. Car had 10's in it for sure.

My formula,with a 2800 converter,hooker catback,and a slp cold air went 11.30's on a 150. These cars love the n2o!