383_Stroker

iTrader: (3)

So, I'm moving in 3 weeks.. That means I need (lol) to get back on the dyno here before i go... Who needs to save money for a move when they have tuning software and a local dyno?

I plan on trying several timing curves and a flat AFR versus a lean to rich..

The ones below are what i plan to try.. Which one do you think will be make the most power? (Or do we think they are all going to be the same?)

Open for suggestions as well

-----
Current Timing:



Pull 2:



Pull 3:



Pull 4:



Pull 5:

proZak

needs more red

InfraRedline

iTrader: (4)

Its hard to tell exactly how the timing ramps (the fine detail) in the pics, but looks like some good comparisons! I am going to guess that the ones with the peak timing at max cylinder pressure then falling off a bit and reramping to redline will show the best resutls...of course mixed with the right AFR slope

Have you considered running a rich to lean slope? I always thought lean to rich was the way to go on our cars like it is on turbo cars, but talking to a few people lately have me thinking quite the opposite. So ill live vicariously through you lol

Also, is this on E85, a mix, or meth?

383_Stroker

iTrader: (3)

Last time it was on the dyno i was accidentally running a rich to lean slope (lol, tune wasnt dialed in down low).. depending on time, i might try mixing some pulls of that in too tonight.

50/50 E85/92 Mix

Its actually been going rich just before redline the last couple pulls i've made, so i figure i'll be lining that out the first pull or two.

383_Stroker

iTrader: (3)

Already more there than your average bear

WSFrazier

Go full E85, and you can be a lot more aggressive.

383_Stroker

iTrader: (3)

I need it to start in the cold mornings

All of these peak at 25* or 25.5* on 50/50 w/ no knock on the street... If i can be more agressive, I'll be honest and say i don't know where to do so..

JapEatr

iTrader: (9)

i havent had the cold start issues with e85...granted i live in texas where the low is only 19f

WSFrazier

Just because most people believe the car stops making power at ~25*... Doesn't mean that is where you make it peak and stop

Then again I tune for the TQ curve and track times, not dyno numbers.

Also, you can adjust the car for cold starts. Mine did it at first too, but its the same as gas now.

383_Stroker

iTrader: (3)

hrrrmm.. well we'll see how my time frame is looking tonight and I might play around some more then..

Any hints on what to change for cold start?

Jrhdpaintball

good luck... cant wait to see results

WSFrazier

Not sure how bad yours was, but mine would crank for a good 5-8 seconds before it would finally turn over.

Add like 30-40% to cranking fuel and go from there. You can play with idle timing a little bit, too.

InfraRedline

iTrader: (4)

Now by rich I dont mean 10's, but maybe try starting at 11.5 or so and lean it a bit from there. It will be interesting to see how each timing and AFR combo affects the power.

I believe Wes is running up to 28* or so, so if the car keeps making power might as well push it a little during testing

As for getting the car to start on E85 in the cold, I live in the one of the coldest places in the country in winter time and last winter my car started up first crank every time on E...but how I got it to do so isnt exactly texbook

So is this on the 2.9?

383_Stroker

iTrader: (3)

Going at 6:30

Current Set-Up:
TVS w/ 75mm Pulley
50/50 E85 mix
50/50 Methanol Injection (lol.. still a carry over, i've not had a good chance to tune without it)
79lb Injectors
RAW 3" CAI
Dual Pass
CX Heat Exchanger
Pacesetter Header
3" DP w/ Magnaflow Cat
3" Mandrel Bent Catback with 36" resonator and Dynomax VT Muffler
141,850 miles
Flood Damage
Three separate instances of a salvage title

--

Whoooaa i would fear for my stock sleeves lives at 28*!

InfraRedline

iTrader: (4)

Im watching this thread like a hawk

WSFrazier

My goal wasn't to run that much timing. But to get the right timing curve I wanted for LBT and powerband I wanted for track... It just ended up that way.

E85 allowed me to run so much more timing at peak TQ that everything else went with it.

ebristol

iTrader: (4)

#4 but do not back off the max timing. Ramp it hard and hold it till redline.

#3 is fail

#5 is semi fail

WSFrazier

Lol, I wasn't going to be that blatant about it...

383_Stroker

iTrader: (3)

The whole reason I'm buying the time today is because no one will be direct/blatent in what makes power and what doesnt

each of these are based on reading of theories on this website.. and what someone says is best but has no dyno chart to back up.. so i'm hoping to provide dyno charts

# 4a is now on the list..lol

WSFrazier

Still... There are ways to make peak numbers on a dyno, and ways to make a better curve for the track.

Different strokes for different folks. Dyno isn't how you determine if a car is fast.

383_Stroker

iTrader: (3)

I agree totally.. the dyno will still show how broad my powerband is though.. even if the peak is lower, yes? ;-)

ebristol

iTrader: (4)

Yes.

So. How did it go?

383_Stroker

iTrader: (3)

Just got in.. give me few minutes to get this info organized! lol

383_Stroker

iTrader: (3)

When I speak AFR in this post, that's gasoline equivalent, not actual

Current Timing:


This pull was wacked out and the car made like 100hp to 5000 rpm and then jumped up.. and i was anxious to move on so we didn't repull it

Pull 2 and 2a:


Red Line is a 13.0 falling to a 12.0 at redline
Blue Line is a flat 11.8



Pull 3:


Flat Fueling gave me the same result on the next two pulls so i stuck with it after that point and am only going to show the graphs for flat 11.8 from here on

Blue Line is the better run two
Red Line is the timing table above



Pull 4:


Same two runs as above + Green Line is the timing table above




Then i took ebristols suggestion:


Previous green line is the original pull 4 timing table, the blue is ebristol's suggestion (and the highest of the day)




Pull 5:


Blue line is the ebristol suggestion from above
Red Line is the timing table above



And finally a chart showing where i started the day versus where i finished Pull 2 versus Pull 4b



Soooo, based on my experience today.. cramming as much timing in as you can, as early as you can and holding it is the way to go.. .. thats pretty common sense

Jrhdpaintball

good work... thanks for taking the time to accually do some dyno testing and sharing it with others..

getting a little bit of knock up top?