Dyno shows issues past 5K

[Bite Me]

I went to the dyno friday for the first time. It seems the car struggles at 5K. A little background, O/R X, Full SLP LM2 catback, JLT TCAI intake. Past that everything else is stock as far as I know.

Whats up with the graph? Both runs showed the same. It acts like something is wrong. This car has never been tuned. I also do not have a tuner on it.

What do you guys think the prob is? I am going to get a tuner and tune from amazon regardless, but am I looking at something else that is wrong here?

 

[VirtualSVT]

how fresh is the tune up?

 

[Bite Me]

I has only a few hundred miles on fresh plugs. Fresh oil. JLT is brand new. Past that the norm.

 

[drews01cobra]

Take a look at my dyno in my sig. It looks just like yours. I spoke with my tuner and he said that dip was due to timing and typical for a N/A cobra that hasn't been tuned. Others here told me it was typical for a stock N/A Cobra. Once again, a good tune should fix it. Your A/F moves around a little much....

 

[Bite Me]

Your right. Its darn near identical. I am going to get a tune and we will see what that does for it. Thanks for the reply. Good to know I'm not the only one.

 

[01bluesnake]

your dyno graph is too lean, the whole time you are above 14afr and should be at or close to 13 for best power. the car is breaking up like that because the ecu is more than likely picking up knock and pulling timing which is also y the power is a little low for the mods. you definitely need a tune and i would guess you could get 15-20 whp from it.

here is a pic of mine, my car has similer mods except a programmer i have a bassani off road x, slp catback with Xr1's, and k&n filter and programmer. i dont have the afr on the graph but it starts at about 13 and ends up at about 13.4 at the end

 

[Brutal Metal]

You definitely need to richen your fuel mixture and I bet you could add more timing, definitely datalog and see how much spark advance you have at WOT from 4-6.5K, you'll wanna see 25-28 or even up to 30 with the correct A/F, And I don't like how that Dyno shop doesn't have a line on the graph for 13 A/F, It's set up 12-14!

 

[hus]

I agree with the statement that you're running lean. It appears the car is running out of fuel past 5k. Adjust the timing and add some fuel and that should smooth some things out. Nothing a good tune can't fix.

 

[ponygt65]

IMO......that's NASTY lean. you never got below 14...that's just CRAZY!

My suggestion: don't go past half throttle much until you get that thing richened up. Stay in open loop.

 

[svtleen]

To play it 'safe' upgrade the fuel pump and get a good tune.

 

[01 Venom]

yep, looks lean to me perhaps to the point where its starting to ping and the knock sensors are yanking timing. And youre running out of fuel up top probably. I know my car was running out of fuel pump up top NA. Typical issue for us, stock fuel pump needs a little bit of help from a BAP in most cases

 

[Bite Me]

To play it 'safe' upgrade the fuel pump and get a good tune.

What type of pump do you guys suggest I upgrade to? At this point I am just going to start upgrading to get more power so getting a good base to start with first is the next step.

 

[Bite Me]

IMO......that's NASTY lean. you never got below 14...that's just CRAZY!

My suggestion: don't go past half throttle much until you get that thing richened up. Stay in open loop.

I agree it isnt safe. Shes going to sit in the garage until it gets a tune. It may be somewhat normal for the 01's without a tune, but I dont want to risk it. Dont want to hurt my motor.

 

[ponygt65]

What type of pump do you guys suggest I upgrade to? At this point I am just going to start upgrading to get more power so getting a good base to start with first is the next step.

IDT you need a new fuel pump. YOu can datalog the FP Duty cycle to make sure when you get a tune, but looking at your mods/power level, you should be fine with the stock one.

I agree it isnt safe. Shes going to sit in the garage until it gets a tune. It may be somewhat normal for the 01's without a tune, but I dont want to risk it. Dont want to hurt my motor.

Nothing 'normal' about that AFR. Good call on letting it sit/taking it easy. You can still fire it up every once in a while and let it sit at idle to keep every thing 'up to par'.

 

[Bite Me]

IDT you need a new fuel pump. YOu can datalog the FP Duty cycle to make sure when you get a tune, but looking at your mods/power level, you should be fine with the stock one.


Nothing 'normal' about that AFR. Good call on letting it sit/taking it easy. You can still fire it up every once in a while and let it sit at idle to keep every thing 'up to par'.

Cool. I have been reading up on it and I think your right. If I do ever charge it I will upgrade the pump.

Tune is on its way so we will see what happens.

 

[ponygt65]

Cool. I have been reading up on it and I think your right. If I do ever charge it I will upgrade the pump.

Tune is on its way so we will see what happens.

:beer:
On it's way? As in mail order, or handheld, or the time for you to go is coming up?

 

[drews01cobra]

I'm not the OP, but I have a question. My 2001 is stock for now...usual bolts on in the near future....should I upgrade to a higher flow FP, or keep the stock on and add a BAP? The stock one is working fine now.

 

[ttk53]

I find it hard to belive that these cars need an upgraded fuel pump with intake and exhaust. But thats just me and maybe I have no clue.

 

[Bite Me]

:beer:
On it's way? As in mail order, or handheld, or the time for you to go is coming up?

Yup, Rick is sending the unit and tune with it. I didnt see a point in a 300+ dyno tune for the mods I have done right now. Thats in the future though for sure.

 

[Brutal Metal]

There is no way your fuel pump will be maxed out on your NA Cobra unless it's going bad, just like others have said check its Duty Cycle!
On my last Dyno run mine was only at 47%~