Nitrous issues on dyno...please help.
07-08-2009, 09:04 PM
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Nitrous issues on dyno...please help. 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.
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.
Last edited by 04RedGTO; 07-08-2009 at 09:09 PM.
07-08-2009, 09:13 PM
#2
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).
07-08-2009, 09:15 PM
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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.
07-08-2009, 11:58 PM
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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?
07-09-2009, 04:56 AM
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I have the nitrous outlet window switch with built in tps switch.
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07-09-2009, 12:58 PM
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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.
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.
07-09-2009, 01:24 PM
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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.
07-09-2009, 01:45 PM
#20
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
