15 HP shot?!? - TCCoA Forums
 
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post #1 of 17 (permalink) Old 05-22-2006, 06:51 PM Thread Starter
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15 HP shot?!?

I had the car dyno tuned this weekend. The car made 290hp and 342 torque with no nitrous. Then we made a couple pulls and tweeked the car with the nitrous. I've got a Zex dry kit and using the ZEX chart for a 6 cyl car I set it up for the 75 hp shot. With bottle pressure at 1000 psi the net results was 304 hp and 356 torque. That means the 75 shot was good for 15 rwhp and 15 rwt. Something must be wrong but I don't know what.
I'm going to have to track test it and see if thoes numbers are right. I expect the 75 shot should drop me a half second in my 1/4 mile times.
Anyone ever talk to zex about running the dry kit on the SC?

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post #2 of 17 (permalink) Old 05-23-2006, 10:26 AM
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Just an idea, but I bet you ran out of fuel either due to a lacking pump or other supply issue. Did the tuner log your a/f ratio and if he did can you post a pic of the dyno sheets?
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post #3 of 17 (permalink) Old 05-23-2006, 04:06 PM Thread Starter
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I don't think I'm going to run out of fuel with a 255 lph high pressure fuel pump and 60 lb/hr injectors. The graph looks strange. The red is the nitrous pull and blue without. I don't know why but they guy driving the car didn't hit full throttle until between 3000-3500. The Kit won't turn on untll it sees full throttle. Jerry said everything looked fine for the two nitrous pulls, it just didn't make much power.
It also seems strange to me that the Zex kit tells me to use the same nitrous pills that a 4 banger would use, yet the V8 uses larger jets. According to their chart my 3.8L V6 should use the 32/38 pills for a 75 hp shot but a V8 uses 43/40. I don't see why a new tbird with a 3.9L V8 should use one and I the other. I called Zex to ask them about it but the guy I talked to was no help at all.


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post #4 of 17 (permalink) Old 05-23-2006, 06:46 PM
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Well if it was tuned by Jerry then I am out of ideas.
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post #5 of 17 (permalink) Old 05-23-2006, 09:13 PM
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Jason,

I'd suggest making a check on the pills and see if they are in fact in the correct location for the Nitrous and the fuel. If they are, then I'd suggest going to the V8 set-up instead of the V6. After all your car is already SC so I wouldn't equate it to a normally aspirated V6, with juice.

Just a couple thought. As far as the tune, Jerry Knows what he's doing so its got to be something else that we may have over looked. Also, are you sure we have the regulator line hooked up correctly.

Bottom line, just check everything to make sure its correct.

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post #6 of 17 (permalink) Old 05-23-2006, 10:32 PM Thread Starter
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I'm going to track test it before I go pulling jets out. The motor sounded like the spun up alot quicker on the dyno than without the juice. As you can see on the chart the pull on the dyno looks a little off. Maybe it just didn't get purged enough on the first run.

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post #7 of 17 (permalink) Old 05-24-2006, 03:26 PM
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put in a 100hp shot and see what happens then :-)

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post #8 of 17 (permalink) Old 05-24-2006, 05:18 PM
 
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Got very very lean at the end of the pull there, deffinatly out of injectors and or pump
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post #9 of 17 (permalink) Old 05-24-2006, 07:21 PM
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Something is not right with the Nitrous setup. A 75 HP shot is good for at least 75+ at the crank. I agree with Steve that an SC should be looked at like a V8 since you are pushing the air like one. Make sure the jets are clear and I would make sure the tigger system is working as it should. Real dumb question....Was the bottle valve open and line nut all the way one the bottle? Disconnect the nozzle and test the system into the air. Check the dumb stuff first. Good luck

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post #10 of 17 (permalink) Old 05-24-2006, 09:19 PM Thread Starter
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Did a little track testing tonight but was only able to get 2 runs in. It's a local 1/8 mile track. Run one was an 8.6 @ 81 mph. Run two with the nitrous was an 8.4 @ 82. I don't have the purge on the car yet so that might make a little difference once I get it put on. I was also on street tires but still managed a 1.85 60' time on the second run.
I really don't think the car is out of fuel pump or injectors. Jerry said that A/F was Ok. I think they were playing with the throttle some giving thoes funny readings.
I'll pull the line out of the intake and spray a shot to make sure all my lines are clear. It's possible I suppose that something got in there and is clogging things up.

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post #11 of 17 (permalink) Old 05-24-2006, 10:43 PM
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Still sounds to me like something is not working right. Be sure to check the other things I mentioned to you the other night.

Make sure your bottle pressure is where it needs to be also. If not, it will have a significant impact on the results. 8.4 should be mid-low 13's. Not bad on Street tires and new engine.

We need to find the problem.

Steve
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2008 Ford Powerstroke 6.4 TT F250 4X4 Supercrew: 12.82 @ 105 MPH

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post #12 of 17 (permalink) Old 05-25-2006, 12:35 AM
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Even if the line isn't purged, it wouldn't make but a 1/4 to 1/3 second difference in the time the nitrous takes to get to the motor. So it would affect your ET a bit, but not a dyno pull. At 1000psi+, the line will pressurize QUICK.

Even a 50shot is "feelable", so you should really notice the 75 and especially a 100.

They're all right that your blower makes you ingest as much air as a V8, so use the V8 settings.

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post #13 of 17 (permalink) Old 05-25-2006, 06:51 PM Thread Starter
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Anyone know anyone at Zex by name that I could call and talk to. The guy I talked to sounded like he could realy a crap about my problem. He just kept telling me to use the V6 settings and not to use the V8 ones.

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post #14 of 17 (permalink) Old 05-30-2006, 12:30 PM
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on my zex wet kit the nitrous/fuel jets are .040/.021 for 75 hp setting,not familiar with the dry system jetting chart.

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post #15 of 17 (permalink) Old 05-30-2006, 06:40 PM
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A 75hp shot is a 75hp shot, no matter how many cylinders. It's totally determined by jet size and pressure. Makes no sense at all that they would call out different jets for a different number of cylinders.

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post #16 of 17 (permalink) Old 05-31-2006, 01:45 PM
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My nitrous system did pretty much the same thing and it turned out to be a kinked nitrous line from the solenoid to the fogger nozzel. I've also see similar problems when a bad ground caused the system to rapidly cycle on & off.

Start with the simple stuff first and don't jet it for more nitrous until you find out what is wrong. Are you using a fuel pressure safety switch, do you have a seperate program on your chip for using nitrous ?

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post #17 of 17 (permalink) Old 05-31-2006, 07:24 PM Thread Starter
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No fuel pressure safety switch. I do have a seperate program for nitrous. I haven't had a chance to mess with it lately. I'll get to it next week.

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