5.7mmImportkilla

I own a 01 Ws6 Auto..
Today was my first time out with my wet nitrous kit at the 1/4 mile i have a IceMan pure flow with HSW microedge and the Interface Tr6's custom tune at 24* and Dr's and some bolts on..

N/A car runs 12.9 @ 104 Mph sometimes quicker but i avg 12.9

Ok here is what i need help on ...

first run i started with a 50 shot interface set for a 50shot using a shark nozzel.. retard it at 3*
RT 1.9
1/8 8.100 @ 88.90 mph
1/4 12.50 @112.16*
Air/Fuel Ratio was at 0.900/.910mv = 12.4/12.3 afr

My microedge setting are:
Trigger 4.35 volts
reset rpm 1300 rpm
drop rpm 1850 rpm
shift 4400 rpm
max 5950 rpm
Min 3000 rpm

Iwas Happy was excited about the 75 Shot..
but This is what i cant figure out!
I set the interface for a 75 shot change the jets to a 41N & 22F
and ran a
RT 2.1
1/8 8.34 @ 89.33
1/4 12.73 @ 112.42 (same as the 50 shot)
Try again last run for the night...

RT 2.1
1/8 8.83 @ 89.41
1/4 12.68 @ 112.63

now i know my Rt sucks im used to my 1.7/1.8 but some reason i could'nt stick..idk?

Well my question is why did the 50 shot top out at 112mph and with a 75 shot i still top out at 112mph!!!!..???

Help! what im i doing wrong?
should i add 2% or %5 more fuel?
should i add or sub timing?
Thanks guys any help would be appreciated ..

zracer323

iTrader: (12)

When you say RT do you mean 60' time? If so that's your problem. You are trapping a little bit higher which is an indication of the more HP. Going from a 1.7 to a 2.1 60' time is going to kill your et

minytrker

iTrader: (13)

Your reaction time doesnt effect your et, did you mean your 60ft? Also your stock O2 sensors can not be used for determining your a/f ratio. (Air/Fuel Ratio was at 0.900/.910mv = 12.4/12.3 afr) The only way to read your a/f at WOT is with a wideband.

5.7mmImportkilla

Tr6 just the colder plugs i use..
RT= reaction time
I use a Narrowband mv with a chart that translate to wideband.. and yes while being at wot..
http://www.harrisspeedworks.com/inst...ion_Manual.pdf

but still dosent explain why at a 50 shot my trap speed is 112 mph then with a 75 shot end up trapping 112mph too??

Carter01

iTrader: (11)

Can you list it like this for comparison sake. (reaction time doesn't matter)
12.5 pass
60ft
330
1/8 et
1/8 mph
1000
1/4 et
1/4 mph

timing on 50 shot

Then do the same for the 12.7 pass and timing....

Brian Coles

How are you manging your bottle pressure? Was pressure the same on all 3 runs?

kidcamaro98

iTrader: (8)

exactly what I was thinking....a pressure drop of 100-200psi would do that...

5.7mmImportkilla

My 1st run with a 50 shot was.
60ft 1.9
330 5.3
1/8 et 8.1
1/8 mph 88.90
1000 10.49
1/4 et 12.50
1/4 mph 112.16
with a 12.4 AFR and at 3* retard

switch to a 75 shot hoping to hit the 12.2 mark
first run with a 75 shot was:

60ft 2.1
330 5.5
1/8 et 8.3
1/8 mph 89.33
1000 10.72
1/4 et 12.73
1/4 mph 112.42

nitrous pressure was between 900/1000
very disappointed i had one more run left..

60ft 2.1
330 5.5
1/8 et 8.3
1/8 mph 89.41
1000 10.68
1/4 et 12.68
1/4 mph 112.63

i don't know?.. even with bottle pressure doesn't explain all trap speed are all alike
with different HP settings??

Carter01

iTrader: (11)

Ok, you are two tenths slower in the 60ft, for every tenth you make up in the 60ft you gain from 1.5 to 2.0 in the 1/4 mile. Also review your mph, you gained more mph consistently so you were making more hp. I bet you were too rich which was killing the top end hp. Is this a wet shot? lean it out to around 12.0 via fuel jet or whatever means you have.

You go to get the car hooking consistently or you really want be able to compare apples to apples.

minytrker

iTrader: (13)

Your 60ft explains the diffrence in your times. Please read the link about using stock O2 sensors for WOT tuning.....it can't be done, period, no matter what someone claims or makes it won't change what the stock O2 sensor is capable of reading. http://www.team-integra.net/sections...?ArticleID=390

I hate for you to have a false sense of security thinking your a/f is safe when you actually have no idea what it is.

Nick@HSW

iTrader: (4)

I have to ask...are you using a fuel jet AND the fueling features on the Interface?

Nick

5.7mmImportkilla

My AFR Holds steady at 900mv/910mv@ WOT that's what the microedge says..
Nick, I have not touch the Fuel feature but Iam using the jet drop switch.
Should i feel a false sense of security thinking I'm running a safe afr with the microedge narrowband??

I just can't over trapping 112 mph with a 50 and 75 shot..
And if it is a afr issue how did I end up well on the 50 shot just About
Knock off 1/2 sec off my 1/4 mile.. But not on a 75 shot?

minytrker

iTrader: (13)

YES! Don't take my word just read the link I posted earlier or go on any tuning forum and search about tuning WOT using your stock O2 sensors. They are called narrow band sensors for a reason. If you want to use the lean shutdown feature get a wideband and it will work correctly.

minytrker

iTrader: (13)

Dont get hung up on the mph thing. There isnt going to be a huge difference in mph or et between a 50 & 75 shot if both are good runs. You are trying to compare two passes where the 60ft is off by .2 which is alot, so its hard to compare the two passes. Work on getting the car to hook on the 75 shot and it will run faster than it did with a 50 shot.

5.7mmImportkilla

2 things fellas..

1st thing, I screw up on the interface settings.. Hopefully I"ll get better times this weekend!! Or I'll be crushd...
I'll keep y'all posted..

2nd thing ..
Just about widebands.. I like the idea of using it what widebands are out there that Would work just fine??
I was checking out the AEM digital wideband air/fuel gauge.. What you guys think??

Carter01

iTrader: (11)

I don't use a wideband but a friend of mine does with his 750 awhp EVO and he uses the AEM digital, it's a nice piece.

KC&97TA

iTrader: (1)

Here's a few things I see from a weekend racers perspective. I'm not being an *** hole.

- You went out one day and made 3 passes, that's called shake down and that day doesn't count. Day two doesn't mean much, Day three you should start to see most of the potential.

- What was the car doing NA? It helps to know about 10 of your NA passes, to see were you're at.

- We also don't know anything about your car... suspension, gears, stall and tires are very use full to know !

- You upped the pills after the first pass, that's a no-no, more power spun the tires or you didn't pay attention and you spun the tires and your 60' slowed down on the last 2 passes, slowing you down. That is a fact.

- If you'd stayed at 50 or started at 100 this would be easier - Consistency!

- Your MPH is consistent, but that isn't telling us much because the 60' and ET are all over.

- You have to be consistent or close to it, don't worry, I catch a rash of **** too, because i keep going faster on every pass, it's hard to dial a car in when it's not staying consistent. It's hard to explain why the car goes .1x faster every time out besides the driver needs more practice!

It's true that for every 50 shot you generally drop .5 seconds, but that's on a car that is set up... you have to hook the first 60' or ease into the NO2 a little more. I would put a 100 shot on it, set the micro edge not to come on for a full second, then ease into the full shot.

I went from a slowest first time out of 11.42, to a fastest 3rd time out of 10.93... the consistency was it was faster on every pass than the one before.

Biggest point to make: Going fast isn't about throwing more HP at it, a fast 1/4 mile car takes a combination of parts to achieve good times.

BOBS99SS

iTrader: (2)

^ good stuff