Pic of my Dyno Graph...Ideas? - Northern California Ford Owners

This is topic Pic of my Dyno Graph...Ideas? in forum Tech Talk at Northern California Ford Owners .

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Posted by Yellow94GT (Member # 431) on :

Well here it is. Looks great until all hell breaks loose at 5900.

I'm open to suggestions [Confused]

[ April 25, 2006, 01:48 PM: Message edited by: Yellow94GT ]

Posted by CDT (Member # 5004) on :

any data logs?

Posted by 98slowhoe 'FIFTYLX' (Member # 895) on :

Man dude you through it in Reverse at the end there or what? [Razz]

Posted by Yellow94GT (Member # 431) on :

quote:
Originally posted by CDT:
any data logs?

You would have to ask Shaun, 93Pony. I'm not sure if he saved any of it.

Posted by CDT (Member # 5004) on :

thats the way you will get to the bottom of it.

Posted by 93PONY (Member # 60) on :

I'll double check the log, but I don't remember seeing anything unusual. We were in a bit of a time crunch though.....

Posted by uncle bill (Member # 3953) on :

looking great upto 5900,valve float?

Posted by JohnB (Member # 969) on :

Compression ratio and plugs you're running with gap?

Posted by Rob [5LVENOM] (Member # 2282) on :

Is your fuel system up to task volume wise?

Posted by BlacksheepMod50 (Member # 2378) on :

Drew,

Thats great that you got your car dynod, but that is one messed up graph. Your car has always had problems - Is this still a continuation of the original issue that you had related to not being able to rev, or did you get that whole thing closed out?

Ryan

Posted by Yellow94GT (Member # 431) on :

quote:
Originally posted by BlacksheepMod50:
Drew,

Thats great that you got your car dynod, but that is one messed up graph. Your car has always had problems - Is this still a continuation of the original issue that you had related to not being able to rev, or did you get that whole thing closed out?

Ryan

Appears to be the same problem [Roll Eyes]

Posted by Red00GT (Member # 5653) on :

heres a solution...

T.O.P.'s on my 00GT [Smile]

wont have the same power but will have no idling or reving problems..i could always deal with a 400rwhp+ mustang with a reving problem [Razz]

jk..

nice numbers [Smile]

hope u get the problem fixed!

Posted by dynoguy (Member # 6457) on :

Looks like you have reached the limit of something. My first guess would be vavle control.Looks like the A/F ratio stayed fairly consistent so it seems unlikely to be spark or fuel related. The data log should confirm the health of those.
Not sure whats in this car other than the obvious blower, I'd be interested to see if there was a similar dropoff at that rpm before you went forced induction. How about some blower belt slip?
I'm also guessing this dyno isn't putting a load on the car.
You aren't really expecting it to pull to 7k are you?

[ April 25, 2006, 11:49 PM: Message edited by: dynoguy ]

Posted by Red00GT (Member # 5653) on :

quote:
Originally posted by dynoguy:
Looks like you have reached the limit of something. My first guess would be vavle control.Looks like the A/F ratio stayed fairly consistent so it seems unlikely to be spark or fuel related. The data log should confirm the health of those.
Not sure whats in this car other than the obvious blower, I'd be interested to see if there was a similar dropoff at that rpm before you went forced induction. That would support the vavle float theory. If it was fine before, perhaps you have maxed out your current airflow potential.

the car is N/A

Posted by Yellow94GT (Member # 431) on :

quote:
Originally posted by dynoguy:
Looks like you have reached the limit of something. My first guess would be vavle control.Looks like the A/F ratio stayed fairly consistent so it seems unlikely to be spark or fuel related. The data log should confirm the health of those.
Not sure whats in this car other than the obvious blower, I'd be interested to see if there was a similar dropoff at that rpm before you went forced induction. That would support the vavle float theory. If it was fine before, perhaps you have maxed out your current airflow potential.

Who said anything about a blower?

Blowers are bandaids [Wink]

Posted by dynoguy (Member # 6457) on :

wow, thats pretty impressive then. sorta rules out belt slip too :-)
Tell me alittle about whats in it

Posted by FasterDamnit (Member # 442) on :

quote:
Originally posted by dynoguy:
wow, thats pretty impressive then. sorta rules out belt slip too :-)
Tell me alittle about whats in it

Belt slip? Worried his alternator isn't charging?

http://www.fordmuscle.com/archives/2005/02/YellowFever/

Posted by Red00GT (Member # 5653) on :

this car is so damn beautiful!! makes me wanna sell my 00GT and get another one of these...well except this time itll have a 5.0 instead of a 4.6 [Big Grin]

Posted by dynoguy (Member # 6457) on :

Thanks for the link FasterDamnit. This is definatly not the typical Mustang that i see every other day.
Very nice car! Sounds like he's got serious skills too.

Posted by Yellow94GT (Member # 431) on :

quote:
Originally posted by FasterDamnit:

quote:
Originally posted by dynoguy:
wow, thats pretty impressive then. sorta rules out belt slip too :-)
Tell me alittle about whats in it
Belt slip? Worried his alternator isn't charging?

http://www.fordmuscle.com/archives/2005/02/YellowFever/

Seriously though. Could my little racing battery be causing me problems up top? What if there is some sort of problem with the main wire from the alternator? [Confused]

BTW, thanks for the complements guys. Hope I can get this fixed and see what she can really do! [burnout]

Posted by dynoguy (Member # 6457) on :

Guys, the belt slip comment was poking fun at myself, i don't know the car so when i saw the dyno sheet up in the 400+ hp range I assumed it was blown like most 400hp mustangs.

Posted by Yellow94GT (Member # 431) on :

quote:
Originally posted by dynoguy:
Guys, the belt slip comment was poking fun at myself, i don't know the car so when i saw the dyno sheet up in the 400+ hp range I assumed it was blown like most 400hp mustangs.

I knew you were kidding at that point.

But I'm seriously wondering if a voltage drop at high RPMs may be causing this.

Posted by 88DroptopGT (Member # 2535) on :

What kind of racing battery do you have? I believe the alternator should be giving you your power at those high RPM's though I'm not sure.

Spark blowing out?

Perhaps you are reaching the limit of your heads (porting)? Perhaps hot spots in the combustion chamber? That make a more erratic a/f though.

Computer issues at high rpms?

Just throwing stuff out there.

Posted by 98slowhoe 'FIFTYLX' (Member # 895) on :

quote:
Originally posted by Yellow94GT:

quote:
Originally posted by dynoguy:
Guys, the belt slip comment was poking fun at myself, i don't know the car so when i saw the dyno sheet up in the 400+ hp range I assumed it was blown like most 400hp mustangs.
I knew you were kidding at that point.

But I'm seriously wondering if a voltage drop at high RPMs may be causing this.

Maybe not so much as a Drop but more that your demand generates more then your supply can handle? Couldn't hurt to switch out to a bigger battery.

[ April 26, 2006, 05:34 PM: Message edited by: 98slowhoe 'FIFTYLX' ]

Posted by Hungry Hippo (Member # 537) on :

do you have an aftermarket ignition box? maybe try a bigger power and ground wires [Confused]

or trade for both my 94's [worship]

Posted by 2stangs69-91 (Member # 1951) on :

why would you all the sudden need more power at 5900 rpms is the funny thing. You have so much going on with your setup it would be hard to guess. What do you have set up for rev limiting?
Does it crap out at the same rpm in every gear? it would be nice if 93pony had igniton scope so you could check out your spark lines and timming changes for each cyl when it is cutting out. I have seen rfi isues mess up spark control.
Good luck.. the bandaid kid

Posted by 93PONY (Member # 60) on :

Reviewed the datalogs from the dyno....

As far as the computer sees things, there's nothing going wrong with any sensors or timing control. I don't think it's a computer issues. The datalogger does not have the capability to log electical system volts so I can not rule out the possiblility of running out of juice at high RPM.

Posted by CDT (Member # 5004) on :

I would think if it was voltage, you should see a climb in pulsewidth.

Posted by 93PONY (Member # 60) on :

quote:
Originally posted by CDT:
I would think if it was voltage, you should see a climb in pulsewidth.

As RPM's go up injector Pulsewidth increases anyway....so how can you tell?

Posted by 2stangs69-91 (Member # 1951) on :

computers ground the injectors anyhow. If you lost enough voltage to shut down the injectors it would show up for sure(since it is a constant battery voltage).. It is obviously not a comman thing or it would have been found already. I would run it on the dyno with a fuel pressure gauge a scope and a vacuum gauge all sitting in front of me whan it was missing. Maybe a 4 gass analizer also. Rule out all the spark and fuel functions then go for mechanical. JMO

[ April 28, 2006, 01:17 AM: Message edited by: 2stangs69-91 ]

Posted by CDT (Member # 5004) on :

quote:
Originally posted by 93PONY:

quote:
Originally posted by CDT:
I would think if it was voltage, you should see a climb in pulsewidth.
As RPM's go up injector Pulsewidth increases anyway....so how can you tell?

usually you will see it go higher than planned, due to the fuel pump slowing down. but you should also see it in the A/F Its hard for me to tell in the graph because the dynojet smooths it so much. You will usually see it dip rich then go lean. Also the run may go by too quick to get enough data without load.

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