I went to the dyno and i dyno 415 rwhp and 375 tq n/a. And with my 150 dry HWS kit, i dyno 505 hp and 504tq. My A/F is 11.8 and its pulling a total 10 degress of timing. My question is: why im not getting close to 150 rwhp? any guess?

 

that is a lot of timing being pulled for a 150 shot. i would think it would be 6 degrees of timing being pulled using the old 2* for every 50.

 

you have WAY to much timing pulled for a 150shot. what cam do you have? what fuel pump?

 

make sure the bottle psi is where it needs to be.
nozzle placement
recheck jet size
whats you total timing N/A

 

Do you have a bottle warmer? are you hitting the nitrous at 1000psi bottle pressure? what gear are you dynoing the pull in? those can play a major factor. Are you sure you have the correct N20 and fuel yets? hear any leaks?

 

Every thing has pretty much been covered above. Just a simple little glitch, but good that you are checking things as you go, the correct method for setting things up. I have a feeling it's something small like low bottle pressure or wrong jets as the MAF is reading correctly and thus your fine a/f, so just de bug and you will have a rocket. i agree, to much timing pulled for a 150 shot. if you haven't added to your stock timing i would pull only 4°. Good luck
Robert

 

Every real potential "problem" was asked already. Top 3 potential issues I see is all that retarded timing, bottle pressure and jet size. What size jet are you using?

 

Its a tsp 233/239 cam. i,m running a walbo 255 fuel pump. n/a its running with 28 or 29 degress of timing. i have 4.10 gears. and its in 4th gear in the dyno. The pressure was around 970-1000 psi on the dyno. it a dry kit i dont hear or see any leaks. will timing kill that much hp?

 

and the jets are .46. and its the HSW Dry plate. can something be clog? the jets are clean(i just checked)

 

timing will absolutly kill that much hp!!!! I felt a BIG diffenrence with 1degree less on a 75pill for a total of 2 retard instead of 3!! its a HSW wet kit.

 

OK. Ill try to lower the timing to 6 degrees and see what happens..will the af change alot? or should i add more fuel also?

 

I spray a 150 every now and then and my timing is set for around 24 degrees. I don't get any knock or detonation with that.

Do you have TR6's?

 

+1 on the timing..should be good with that.

 

out of injector?

 

If he was out of injector then it would start to lean out up top. At 11.8:1 AFR I don't believe he would run out of injector.

 

Yeah i got tr6 and 42 green tops injectors. i think next weekend ill get it tune with only 6 degree of timing pulled

 

that should get you closer to what you are looking for safely

 

also some dry kits are rated @ flywheel hp (i think) so if that was the case you would probably only see 120-125 rw or so.with a safe afr and pulled timing 4-6 * i think that 120-130 rw would be about right.