I made plans to take the wagon to the track on friday. If all goes well I'll get some baseline times. The local track gets crowded, so i am not sure how many runs i'll get in. I'd like to get 3, one without the n20 and the other 2 with. I was hoping to have my slicks mounted to some old steel wheels but that doesn't look like it is going to happen. Time to see what this 4000lb tank will do. With the EBL 1/4 mile data I managed a 13.4 all motor and tire spin. The track will tell the truth. I'm gonna get some video if I can too.

 

took it to the track on friday. I have to say the n2o runs were dissapointing, slower than NA. I realized I have a carb n2o kit with jetting for 6 psi, not the 28-32psi (or higher, can't remember the deadhead psi) I am getting from the pump. which is where I tapped the fuel from. My AFR was 11.1 as read from the EBL with the LC-1. But NA I got a 14.7, 14.5, 14.4 and a best of 13.9. The 13.9 run was only .5 mph faster in the et that the 14.4 run. I ran out of rpm in 3rd gear I think, should have shifter to od to pick up speed. I have video and the slips, just have to get time to upload them. I have some AE tuning to still work out cause it breaks up a little when I mash the gas, giving me slow 2.1 60 fts, that and the 245-45-zr17 goodyear street tires didn't help. So I went out and bought a holley FPR and a 0-15 psi gauge to hook up before the fuel noid, and I will do some tuning late at night.

BTW, the 1/4 mile data on the EBL was spot on for ET!! I datalogged every run. You just have to be sure you start it right where you see the tps/kpa percent starting the steep rise. This way it is accurate. My mph is high in the EBL but that is because my speedo is 4-5 MPH fast.

Also, humidity was like 90%, temp was 92d at sea level. My intake air temp was about 130d.

 

What did your AFR's look like on the NA runs? What kind of total timing were you running? Could be more left in it depending on your cam, what were your MPH's? That could tell us alot about how much power your putting down.

NOS makes a TBI specific kit, so find out what jets are used in that kit and try them out with your 4 barrel kit. Might want to cross-reference the N2O jets as they should be the same between the two, if they don't match up for say a 100Hp shot I would contact the manufacturer for help, you really don't want to run the risk of going lean with the laughy gas.

 

No need to get fancy and expensive with extra regulators and lines etc. Check this out DynoTuneNitrous.com . Just recalculate your jet sizes for the fuel pressure you are running. Jets are cheap. HTH

 

AFR on the NA runs were between 12.7 and 12.9. To be honest I haven't made a dump log yet of the runs. Total timing was 31d. the MPH was 96-97. But like I said, the 14.4 run was like 96.3 mph, while the 13.9 run was like 96.8 mph. I definitely have some more tuning at WOT to do. So i can get more out of it. And I should get into the 12's on the gas. I have to get my slicks home too, that should give me a faster 60ft.

I have been playing around with the total timing(w/PE). I am still having an issues with knock counts @ 100kpa, in the 4400-4800 rpm areas. I added fuel before and after the cells, took away alot of timing, down to 24d in those areas, and nothing seems to get rid of it. I dunno, but it doesn't happen most of the time on a full throttle run from a dead stop.


As far as the regulator, it was 19 bucks. I had the guage and all the fittings. Since I am in the Air Force all my fittings are stainless steel aircraft fittings, and the line is the 4000psi burst, double braided teflon line. So it doesn't cost me anything to change or upgrade. I wanna get the n2o AFR closer to 12.2 I think and go from there. It was just that 11.1 was WAAAY rich, it started sputtering and had no pull.

 

I wouldn't have bothered racing in conditions like that. It's one thing if you're racing for money, but weather like that is hard to run well in. But, that's just me.

 

That and thunderstorms is all you ever get here on the east coast... For the next two months anyway. Then it gets cold again.

 

I haven't been to the track down here lately for that same reason. It is 98* right now with 40% humiditiy, and last week was 104*. My IAT was at 168* and that was with cold air induction (pulls from above the condensor).

 

I'm with you guys, but it was last minute, and I figured what a better time to get a baseline then on a hot and humid day. I also got 8 runs in cause there was like 35 people there. So I got to seee where it launches better, rpm at the traps, So, I have some more tuning to do. I wanna see if leaning out the PE afr will give me some speed/time. I have the vortec heads, so I figured with a newer chamber design, it may like the leaner afr. If not, I'll go richer, but I know it doesn't like 12.0 and lower.

 

Where is Yardley? What track were you racing at? Sounds like the same conditions 2 weeks ago when I went. Everyone was off 3-4 tenths.

 

Right outside Philly, north of levittown. The track I went to was ATCO, this past Friday. Apparently everybody was still running a few tenths slow.

 

If it really really slows down when too rich, it's probably indicating a weak ignition system (maybe spark plug gap, or coil output, etc...). A good ignition system should ignite 10:1, and it shouldn't fall on its face at all above 11 on most motors (lose some power, but not much).

 

Red, that being said. my MSD box took a crap right before I went to atco so I had to run wih the stock ignition system. That could have been a definite factor.

 

Did you mount the MSD in the engine bay, or in the passenger compartment? I'm thinking if I ever get around to putting one on my car, I'll mount it in the passenger compartment somewhere, to keep it cooler and cleaner, and give it plenty of shock absorbtion.

 

I mounted it in the engine compartment because I had one overheat a few years back when i had it behind the glove box. So I mount them under the hood, on the fenderwell, with an aluminum shield on the top to keep water from going on it. Though my El camino has the 6al in the same spot, for 11 years now, and no problem. My brother has his 6BTM mounted under the hood on the opposite fender as me, for about 8 years and no problems either. Just my .02. I will pick up another MSD or get this one fixed. I am starting my addition on my house and the cars are going to take the back burner for now. Future track trips aren't likely in the next few months.

 

Just going to show what a little heat will do to your times. I know this is a street start up a highway on-ramp, but oh well its about the only place that I can make a WOT run in town. The engine was heat soaked, the A/C was on, and I ended up getting 9* knock retard at around 4,500 rpm. I typically run very low 16s at the track. I am still battling injectors that are going static and not having my wideband is a B. PS- My speedometer reads about 5 mph slow @ 70 due to bigger than stock tires (have the transmission setup with stock speedo gears for a G20 w/ 3.73s and P225/75/R15s that messes with the ET/MPH reading somewhat. I also let out a full second before I hit the 1/4 due to the end of the on-ramp coming up.