So I got my car on the dyno last week. The ultimate goal was to get the 201 degree tables on the iat to pull enough timing to handle a 100 shot, and to get the -32 degree tables to pull enough to handle a 200 shot.

So here is how it goes down.

A few motor runs are done, the the first nitrous run is done. I pick up 100 hp and 160 torque. Peak timing is set to 22-23. Na timing is 26-27.

All looks well so we go to the 150 shot. On this run, the timing is initially way too low. The car actually picks up about 125 hp, but makes less torque than on the 100 shot.

We add some timing back in to get it to the 17-18 range. We jet it for the 200 shot. This run it just falls on its face. It has a nice initial torque hit, but then it just runs out of steam. I double check the jets, and we try it again with the same results.

At this point we go back to the 100 shot to see if it still pulls the same as the first. It doesn't. It doesnt make crap for power.

We try one more motor run and put down identical numbers as the first ones...so the motor is fine.

At this point we think maybe a bad nitrous fill with lots of air in the bottle. Dyno time is about out, so we head back to the shop to check the bottle. I get the bottle out of the car and open it. It is for sure full of nitrous. We let it spray for a bit then shut the valve. Top it off with 4 lbs of nitrous.

I have not messed with the system since.

Anyone have ideas as to what might have happened?

I have power going from the battery to the relay which is inside the car. Then from the relay I have a single 12 ga wire going under the hood. From this wire I am powering the nitrous and the fuel solenoid, as well as getting power for my iat tricker relay. I am using a single ground wire that grounds under my air box. It is also a 12 ga wire and is about 12 - 16 inches long.

 

Check your wires. Or a blockage on the nitrous solenoid. What was the AFR on both runs. Either way its not getttin the spray at all. either both solenoids arent opening (probably electrical) or N20 Solenoid isnt opening (probably blockage or bad solenoid).

 

Based on the a/f ratio it was for sure getting fuel. Both the fuel and nitrous solenoids are brand new. They are brand X and I am running a nitrous filter.

I will double check electrical connections, as well as the grounding point. I am half tempted to run another ground over to the block somewhere.

 

I would make sure you have a good ground to the frame is where I put mine at. Make sure and grind the paint so it has good contact. I think you have either a bad connection eithere on the power side or ground. Are you using a tps or wot switch?

 

I would give chris or Dave a call man.

 

I have the nitrous outlet window switch with built in tps switch.

 

What size solenoids do you have?

 

They are the brand x ones.

 

What was the A/f Id bet its stupid rich. if you put to much fuel in it it will lose power and "lug" Post the a/f for all runs and timming numbers. also did you look at the plugs at all? what plugs?

 

Check with Dave as what the most a Brand X solenoid will flow. The solenoids might only flow a max of 150hp, despite the jet after it.

 

I ran into that problem, there only good to 150. Doesnt explain your whole problem though. You have some wiring issues I bet.

 

Nitrous outlet told me they were good to 225 I believe.

 

The plugs are the non projected tip ngk7's.

 

I am going to wire in my lean shut down switch, double check my ground, jet it for a 150 and go see what it does.

 

What was the A/f

 

On the first successful 100 shot run it was low to mid 11's.

The first 150 shot run was low to mid 10's.

The first 200 was low to mid 10's.

The second went into the 9's.

The last 100 shot was in the mid 10's.

It is like the nitrous would hit then die off.

If it were a grounding issue it doesn't make sense cause both solenoids have the same ground.

 

It's probably not A NITROUS delivery ISSUE. ITS TO RITCH TO MAKE POWER. What jetting were you using?

 

For the 100 I was using a 52n 28f
150 62n 34f
200 78n 46f

Problem is the first 100 shot run made good power. The last did not. I was using the same jets on each 100 shot run.

 

you need to go down to the 26 on the 100, 32 possibly 30 on the 150 and 40 on the 200. How much timmign are you pulling on each shot? is you base timming tune based off of best mph at the track or hp or tq?

 

you need to pull plugs after each run try to gewt the timming mark just barely on the end of the tip and about a 3/4 turn of fuel on the barel and a light fuel ring at the bottom. Then pull 2 more degrees of timming before going to the track. the dyno will not load it like a full pull. look at the plugs there and work you way up watching the mark. at most it should be approching the bend no on it for a safe street car tune. what plugs? id say on the 200 you need a 9, 150 8, 100 7