New dyno results: Not good but not really bad.

[moneypit94]

Well i went to AFM today and got my car dynoed with my new pms. They tweaked and tuned on it for a little while. But I ran into a problem. I start running lean near the end of my runs.. They said it was probably my walbro 255 inline and that i should switch to a t-rex...

Anyways they quit at 5000 rpms on all my runs except one because of this. I made around 460 on average @5000.. Then they bumped up the fuel pressure to see if that would help and i made it to 5200 by doing that and made 495... You can see how rich i was running...

They didn't mess with any timing just fuel. I left early cause i didn't feel like wasting time trying to tune it with it messing up... So basically its only tuned a little on the AF ratio. I think the car has a ton of potential now.. I wouldn't be affraid to say over 530 after i get this fuel problem fixed.

As they did last time the run viewer messed up the graphs a little. The RPMS should max at 5000 and somewhere around 5200. Also the AF did not even get to 13 the whole time.

So i was a little discipointed that i have some more work ahead of me but i can defently live with the numbers considering the circumstances.

 

[DougNuts]

Looks good, get that fuel system problem sorted out so you can keep the A/F ratio below 12, I'd say below 11.25 would be good at that power level. Lean is mean, but unless you're rich, keep it rich.

Kudos to AFM for getting out of it early to keep any damage from occuring!

 

[Zero Signal]

With a torque peak that high you probably have at least 50 more hp just by reving it higher. Judging by the shape of the curve, you'd probably see your peak HP at around 6000-6500 rpms. How exactly were they adjusting your AFR? Are you running forced open loop?

 

[ChromeYellow94]

The 255 walbro inline flow's more Than a T-rex....I know that for sure but if you really want a t-rex....I'll trade you

 

[moneypit94]

With a torque peak that high you probably have at least 50 more hp just by reving it higher. Judging by the shape of the curve, you'd probably see your peak HP at around 6000-6500 rpms. How exactly were they adjusting your AFR? Are you running forced open loop?

yes they were adjusting the afr with the pms... i don't know what you mean by the forced open loop...

 

[moneypit94]

The 255 walbro inline flow's more Than a T-rex....I know that for sure but if you really want a t-rex....I'll trade you

Well the guys at AFM acted dumbfounded that i was using a inline walbro instead of t-rex... They said that my problem was one of two things and that was either i was maxed out on my injectors or the fuel pump wasn't adaquit... They then checked something and said they were pretty sure it was the fuel pump.. They recommended a t-rex

They then went on to say that the rating on the fuel pumps isn't what its cracked up to be... They said that yes they will produce that much fuel but like 2 inches in front of the pump instead of the other end of the line.

Rick then went into how i should unhook my fuel line up front and wire the fuel pump on and time how long it takes to fill a gallon jug... That is the most accurate way he said. (i think this is used to find out the best injector sizes too)

 

[mo_dingo]

I was just reading through your homepage, and saw you have a Holley 255lph in-tank and the walbro 255lph in-line. I think you are covered on the fuel side. Your 42lb injectors are fine also.

Sounds like you need to change the injector pulse width tables w/ your PMS. That should richen things up on the top end.

Fuel pressure isn't your problem. It's the "tune", or lack thereof. That dyno place sure screwed up the graph; I wonder what else the screwed up?

Have you checked your FP? That will tell you for sure!
Scott

 

[moneypit94]

They checked the fuel pressure... At AFM you can't be in the building when the dyno is going on... you have to be outside, insurance policy or something. Anyways i think thats why they said i need a different fuel pump...

As far as them adjusting everything i think they have it covered... Considering the pms is their product...