Originally Posted by SG4247

I ran a 100 shot on E85 with the stock pump.

When the nitrous system comes on, there was a big drop in fuel pressure that would lean the AF ratio for about .5 seconds - until the pump could recover. This is not a good thing.

On gas it would be easier, but the stock tank regulated pump system just doesnt work well for power adders.

So I got nervous about it and installed the Deutchworks pump and had the tune adjusted.

A 75 shot worked really well with the stock pump. Car hauled *** too. Ran several 11.90s and 11.80s.