Mods in sig.....dry kit....with 42lb injectors. how big of a dry can i use?

 

I would start with a 100-shot and watch it with a wideband.
If you can hold a mid 11 AFR no problem then you can start increasing the N2O jet.

 

Well those injectors will support plenty, at this point it will become the stock fuel pump that limits what shot you can spray before going lean.

On my previous car I had a TSP 225 cam, all bolt ons, and ran the NOS 5177 kit jetted for a 125 shot. I had Racetronic 37lb injectors and didn't go lean with that size shot. I still had the stock pump as well.

 

Oh, I see your running TR55s, when you get the nitrous installed don't forget to get a set of TR6s. I run them gapped at .038 with my setup, 125 shot, great results.

 

I would od like white2001 suggested. I think you'll prob be able to go bigger than you think. I will be pushing 550rwhp on 42's.
Robert

 

nice....so ill have my tunner jet for a 125 and slowly increase from there

 

I agree, just size up your jets and make sure you have TR6's and see what your AFR is.