Ed Colby

I have a 14z51 with 1 7/8 LT headers catless xpipe and a halltech CAI, and a nitrous outlet single nozzle setup running a 100 shot currently. I asked a couple of performance shops on what would be Safest to run on the C7 consensus seems to be a 100 shot which is what i am currently running.

wanting to go to a open drag strip night soon and was wondering if anyone sees anything wrong with changing to a 150 shot for a couple of passes.

Looking for peoples thoughts on running 150 shot. I know the 100 shot is supposed to be the safest but would it hurt to make a few passes with 150 shot?

robert miller

I am not running NOS but if some shop that does & seeing these car all the time. I don't think I would do it but then again some other guy in here posted he went from a 100 to 150 and car did good but have not seen anymore on it.

I do know like you should these pistons & rings are the weak point in this motor. Good luck....

sales @ WXM

We've done a 150 shot on an LT1, it holds it fine. If you are going to increase the shot through the jet size, you will want to adjust the timing too.

I don't think I would go over a 100 shot in less you have -8 or larger PCV lines either. It will need proper crankcase ventilation. I feel like I hear of a lot of the LT1 guys making more than 600whp on the stock crankcase ventilation system end up breaking pistons/lower ring lands.

Ed Colby

thabks for the response, the tuner did pull timing for the 150 shot also, he had mentioned should be fine on a 150 shot but would recommend changing out the valve springs as the 14 valve springs are weaker than the later model valve springs?

sales @ WXM

I'm unfamiliar with the revisions on the GM valve springs on the LT1's, but is usually a good precautionary measure to upgrade springs on higher horsepower cars. As long as the higher spring rate did not have negative affects the AFM lifters or anything else. I don't know of anyone who has done springs only on a Gen5 LT.

Molan Labe

2017 GS/A8 so you're recommending -8* retard on 150? My set up is currently at 100 shot nitrous outlet plate, brisk 12rr, winmax
on at 3500 and 85% off at 6200. And an LNC 2014 set at 4*.
93 octane, your ported TB and an atomic airforce. If I bump to 150, the recommendation would be 8* or 6*?

Ben@WeaponX

ultimately it depends on what fuel you're running for the nitrous, but -8 is a good starting point and you can walk it down on the dyno if it allows. With Q16 on a 300 shot with my first C7, I believe I was pulling around -10* out

Molan Labe

Thanks Ben - *4 On 100 with 2 steps colder sound about right to you? Unfortunately I dont have access to a dyno.

3honkz

Ran 100 shot on my car with just bolt ons and e85 and then added a cam and turned it up to 150 and had no problem for at least couple of years. Make sure u get a flex fuel sensor and run E85 to be safe and have a good tuner that knows what he is doing tune it

Molan Labe

Thanks