Ksths2

iTrader: (1)

nope just drops in power, no noises at. Pulls like a mother till about 6500 and then just loses power a bit but feels like a flutter almost like its on the rev limiter but tach says less than 7k and plus it should shift into 4th before than happens.

Nitro Dave's Nitrous Outlet

iTrader: (25)

OK, I am leaning towards to rich just like the others but I dont want to see you start leaning it out with out knowing for sure.

When you replaced the fuel pump did you replace the fuel filter as well?

I would put a fresh set of plugs in it and go make a pass and kill it instantly and pull the plugs. The wideband is a great tuning tool but if you are questioning if its accurate the plugs will varify what you are seeing. If the plugs are rich then start taking fuel out of it.

If the plugs are lean you need to find out why since you are already so big on the suggested fuel jet. Put a fuel gauge on it you can watch for varification..
Dave

edcmat-l1

iTrader: (10)

Was this ever answered?

Ksths2

iTrader: (1)

yes fuel filter was new as well and sounds great on the rest. Next race day is next Friday so it will be a while but i'll repost as soon as i know something.

No your right, i looked but forgot to repost about it, they are gapped to .032 Thanks!

Ksths2

iTrader: (1)

Update: I ran the correct fuel jet size last night .028 and the 100hp N20 .052 and I bottle pressue was a little low at 900 but i ran it 1/8 mile and recorded a/f on my fast meter and it felt weird, didn't pull like usual i figured and started to surge at the end so i lifted and looked at the a/f and it was lean i'd say 12.3 consistently on right bank and 12.0-12.6 on the left so i changed back to the same 3 sizes bigger fuel jet .031 I had been running and instantly back to original. BAM off the line, pulled hard all the way down and ran the best et yet in the 1/8 6.89 @ 102 - i checked the a/f meter and it was 11.8-12.5 is the range from start to beginning even through the shifts etc. So i'm a bit confused on why it doesn't work good with the correct fuel jet?
Oh in case your wondering if it fluttered on top end, i don't know since it doesn't do it in the 1/8 mile but only does it through the traps on the 1/4 mile top of 3rd.
Any thoughts?

brandoz28

iTrader: (3)

what is your base fuel pressure set at?



also try moving the window switch up next time, the nitrous may be getting turned on/off at the top of 3rd, the nitrous is on and you're accelerating, then the switch turns it off, and perhaps the motor is "dragged down" and goes slightly under the window switch and then back up.

just an idea. simply increasing the window switch rpm to around 6800 may be able to let you see if that's the issue

Ksths2

iTrader: (1)

fuel pressure was 58lbs on the dyno.

I agree on the window switch.

Sunday was another test & tune at our local 1/8 mile track and I bumped the window switch to 6700, left the richer fuel jet in and since the traction was awesome i turned the prog controller to 100% right at 2500rpm and that made a huge difference. It ran great all day and the a/f ratio was consistent about 12.0'ish on both banks.

It ran the best on motor of 7.31 @ 97mph w/ 1.650 60' and on N20 was 6.68 @ 103 w/ an amazing 1.48 60'

I just need to get it back to the 1/4 mile to see what it can do