Pulley Chart Stage 1 Nytro Testing Done !

[full tilt viper]

I've got some good testing info from my stage 1 running in Ontario at 600'. This is my second supercharged nytro so I have old notes to make some comparisons. The one I have now has cold air, stock fuel system , and the inter-cooler. Been testing pulleys and watching AFR's. Last season I ran 25tx29b with extra fuel pump and reflash . It was making 8-10 lbs on pump gas. Motor detonated even with the reflash . After some research I've heard that alot of people who bought into this refalsh have taken down a motor. Sled never ran well once I had it done, hard to say for sure. When I bought this one it was 28tx27b so it was under driving the supercharger. My mistake I was posting earlier this is was 27tx28b .

So here are my testing results -18 28tx27b makes 5-5.75 lbs
28tx29b makes 7-mostly pushing 8
Afr's are alot more stable throughout at 5 lbs. WOT 11.7-12.11
Afr's with 29b started to vary and creep up at wot 12.3-12.5
Switched back to low boost for now but I think I can take 1 more pound safely. I think 28x28 would be perfect anyone running a 28x28 set up ?

 

[nytrozula]

I have the 28/28 and it is getting around 7 lbs, of course that is when it didn't have a broken shaft!