Help guys, I'm running an F1 TNT kit at the 250 setting. It is super fat (9-1 afr) and I can't seem to get it to lean out without drasticly reducing the fuel jets, pressure and tuning. It should be pretty close with the 58n and 31f jets that it comes with but its not.
I'm running a stand alone with a -6 fuel feed line to the cylonoid at 55 psi, could the big fuel feed line be the problem?
I can't get TNT to answer the phone today..

 

Just start trimming down the fuel jets until you get the airfuel close. Then you can make small adjustments by changing the fuel pressure.
Dave

 

I did that, I went clear down to 25f from a 31f and it is still in the 9-1 to 10-1 range. I didn't lower the fuel pressure with the 25 jets though..

 

TNT says that I need to keep it at 60psi and to run the 31 jets, I know it would lean out if I keep going smaller on the jets and fuel pressure but they are baffled on why it's so fat.

 

is the car making close to the power that you are jetting for.

 

Don't know, I haven't dyno'd it. Just track time.
It went a 9.78 @ 137 but the afr was around 9.1 to 10.1 to whole pass, started to slow down on the top end because it was so fat.

 

TNT thinks the FJO that I got from you guys might have something to do with it. THey said their noids don't like to be pulsed

 

The TNT solenoids should be fine with the FJO. Here is where I would start.

1.Make sure all solenoids are firing.
2.Make sure you have a good bottle fill and bottle pressure is around 1000
3. Check the hoses for flappers inside.( this is Teflon slithers hanging down blocking flow)
If both solenoids fire and the bottle weighs correct and when you fire the system you get a good plumb of nitrous ( white cloud) Start checking for a flow restriction on the nitrous side.

You will do this buy doing a burn test.
1. Start with a full bottle.
2.Purge the air out of the main feed line.
3.Fire the nitrous solenoid for 10 seconds
4. Weigh the bottle with out unhooking the main feed line. Weigh it just like you did after purging it.

5. How much nitrous did you use.

You should burn 1lb per every ten seconds per 100 hp.



Now last question. What is the flowing fuel pressure? Are you looking at the gauge with it dead headed or are you flowing it using a flow gauge?
Dave

 

I did not flow the fuel, wouldn't it be at least what the gauge reads or lower since it's on a stand alone with a return line feeding back into the tank?
What should it flow?

 

Sometimes the after market gauges you use can be OFF. Not calibrated correctly.
I use a certified gauge to check flowing fuel pressure.

Setting the fuel pressure flowing is more acurate than setting it while dead headed. The return flow will not equal the flow you use per HP setting..
Dave

 

Also while adjusting airfuel (tuning) make sure your FJO is set at 100 percent and you are not progressing it or you will never get it dialed in correctly.
Dave

 

How much fuel should it flow in a minute at 60 psi?

 

Dave, I'm going to give you a call today.
Chris

 

Ok If I am not here just leave a message and I will call back.
Dave