Burrhos

iTrader: (3)

Hey all,

I'm trying to gauge whether or not my car is picking up the expected mph/ET with the 62N/34F combo I've been running.

Details of the car are in my sig.

With the nitrous setup(tires, extra weight etc) The car is a consistent 11.0-11.2@127mph on the motor and I went a best of 10.2@138 on the 62N/34F@55psi.

The et pickup seems ok but the mph seems a little low. I was hoping to see closer to 142mph in the 1/4 with the 62N. I dyno'd the car and it made 456 on motor and 610 with the 62N. I was in full drag race mode with Mickey thompsons on the back so the numbers are a little low, but the gain from motor to nitrous pull is dead on.

I run Mickey thompson et streets 295/45-17s in the back and I'm crossing the finish line around 6700 in 4th gear.

I pilled it up to a 73N/37F and dropped to a 10.0@139 which again seems low but the controller was cutting the nitrous on/off around the 1/8 mile due to it being too rich.(10.5afr) I never got another chance to make a pass as my laptop crashed and I couldn't make adjustments.

Am I being overly optimistic with my expectations? I know that it takes more power to go faster, the faster you are but I wanted to hear from the community on whether or not I was way off base.

Thanks in advance.

TeEnAgE pHeNoM

iTrader: (6)

It's not picking up because it's fat. You need to run a br7ef spark plug gapped at .030 if you're not already. Change your jetting on the 150 shot to 62n/31f and pull about 7 degrees of timing as a starting point. Go down 1 fuel jet size at the time until it quits picking up mph. The same goes for the 175 shot. If you're already that rich I'd start with a 73n/35f. Same process as stated on the 150 shot. I'd pull about 9 degrees out for 175.

Burrhos

iTrader: (3)

Ya, current plugs are the 7s@.030. I run it on the rich side in the interest of keeping the motor together. It usually runs around 11.5:1 fueling. My particular car prefers to be rich as it does not pick up power on the motor whether the fueling is 12.2 or 12.8. I've confirmed this on the dyno.

blacktransam

iTrader: (13)

your leaving out the most important info. Can you post a pic of both motor and nitrous time slips?? How about the break downs??

Burrhos

iTrader: (3)

I don't have any pictures of the timeslips on me right now.

I'll see if i can get them uploaded tonight.

TeEnAgE pHeNoM

iTrader: (6)

Then why did you waste time posting if you already know the answer? Dynos don't mean ****. How's that dyno racing working out for ya? Lmao. You need to be tuning for mph on the track. Just because it didn't pick up on the dyno doesn't mean it won't at the track. Btw running it fat ie 11.5 doesn't make it any safer than 12.5 as long as you have the correct timing pulled. 10.5 is asking for trouble.

Burrhos

iTrader: (3)

Couldn't agree more. 10.5 is way too fat and that's why the controller cut it off. It was the first time I had run the .073 pill so I was just getting used to it. I've logged over 250 Dragstrip passes on the car so I know what fueling it likes on the motor and what it does/does not pick up.

Nitrous is a different animal though and there are a lot of knowledgeable people on this forum from which I want to learn.

03EBZ06

The 73/37 jetting is way leaner than your 62/34 combo. Based on your 62/34, I would expected something closer to a 73/40 combo.

Poss Problem:
Which solenoid are you using for nitrous? If I had to guess, your solenoid is not staying open the entire run or nitrous flow is an issue. I say this because you jetted way leaner and instead got a richer result. Personally experienced this w/elcheapo solenoids.

11.5-12.0 should make good power for nitrous. Other thing is how much timing are you running?

Burrhos

iTrader: (3)

Entire kit is NX. Lightning noids.

When I spray the 73 pill, I had C16 in the tank and 50/50 mix of 93 and 110 in the main tank. Based on my other scans of using a 50/50 mix, the car richens up about a half point so that's part of why I think it was fat.

shortdog

iTrader: (1)

Bad advice. If he's already at 10.5 N/F on a .073N .037F, why would he want to jet richer?

Ex: I had a .073N .031F in my ride and it was still rich. A .078N .031F got me near the ball park.
He could have solenoid problems. I usually send mine back to NX to get checked/repaired every two years.

12.0 N/F minimum as long as there's enough timing pulled.

A lot of nitrous companies jet their fuel on the super rich side, but being rich is NOT safe! He needs to check his plugs too.

Burrhos

iTrader: (3)

Wideband has been in the car pretty much since I bought it over 2 years ago.


How do you guys handle the constant fueling changes with each gear shift?

I usually ignore(for the most part) the fueling in 1st and 2nd gear as they come up so fast and then I'm in 3rd and 4th before the 1/8 mile. I have been focusing on the fueling in 3rd and 4th primarily and shoot for an 11.5-12.0.

shortdog

iTrader: (1)

Oops, I forgot that quick you stated you had a wideband, so I edited my post. You still need to check your plugs though.

Was your bottle full? If you're getting richer going down the track, sounds like your bottle is getting empty. Also, your pressure drops quicker when it's set high, like over 1000-1050 psi.

Burrhos

iTrader: (3)

I'm observing about 75-100psi of drop from start to finish. I had 2 bottles, both full at the time. Made 3 hits out of each one.

Noob question: Can a car make the same power with 900psi versus 1050psi in the bottle? Maybe it's placebo but the car seems to hit harder, feel faster with the needle around 1000-1050psi.

I know it's all about consistency so I try and make sure it stays at the 1000psi mark. I have the bottle heater on a pressure switch that is set to 1000psi and it does a good job of maintaining it.

Should the fueling remain constant for the full 1/4 mile or is some richening up expected towards the end?

Burrhos

iTrader: (3)

Here's a couple timeslips.

Left slip is a motor pass and the other 3 are nitrous with the respective pills at the top.

Plugs are a constant BR7EF@.030.

03EBZ06

yeah, it would be richer. and thats my point. he is way richer with a leaner jet meaning maybe something wrong w/nitrous supply.
people usually go the other way, start running out of fuel supply and lower nitrous jet.

TeEnAgE pHeNoM

iTrader: (6)

Did you see how your trap speed went up on the 73n/35f? You were going in the right direction. I would shoot for 12.5 a/f on the wideband. As long as you have 8-9 degrees of timing pulled lean that dude out until mph stops.

shortdog

iTrader: (1)

A lil' misunderstanding, but gotcha.
It's less of a psi drop at 900-950. I wouldn't go pass that unless you have a nano which raises it to 1050 psi and keeps it consistant.
Bingo!