Cobra swap gt dynoed!

[zacmustang03]

Finally got my car on the dyno this past week . The car is a 2003 gt with a full 2004 cobra drivetrain and built sra.
Mods are

Posi ported eaton
2.8 upper
2lb lower
Custom Cobra hat
Twin 255 walboros
Duel fpdm
60lb injectors
160amp alt
Lfp sb tb and plenum( not on at the time of dyno)
3 core rad
Lfp duel pass heat exchanger
2400maf
Cai
O/r X with 2.5 mac cat back
31spline moser axles
4:10s
Darkstars 15x4.5
160 front runners
15x10
325/50/15 mt drag radials
Corbeau seats
Rear seat delete
( car weights 3350 with me in it)

On the 18th pull the Car made 485rwhp and 486 torque with
12.0 air fuel.
That was on 91 timing18 degrees
For some reason the data log would stop logging after 4500rpm like just stop recording , odd. Had a fuel rail pressure drop at 5000 went from 55psi to 20. He recalibrated some of the stock returnless settings and it fixed it. After that it never dropped passed 32psi. The car blew the transmission(t56) out of it on my 1000km drive home. Its getting rebuilt now and then ill be bringing it back to him to dyno again with the new lfp tb and plenum. Hoping for over 500.


Someone want to help out on posting a video lol

 

[zacmustang03]

 

[Zemedici]

Link to video? I'll embed

 

[zacmustang03]

http://m.youtube.com/watch?v=fTuSUDqmBVo

 

[Zemedici]

[Youtube_browser]fTuSUDqmBVo[/Youtube_browser]

 

[Mach828]

I'd be worried about the fuel pressure drop. 55 to the "fixed" 32 is still unacceptable. It shouldnt drop more than 1-2 psi. Plus you shouldn't need 55psi of fuel pressure with 60s, 91, and 480hp.

 

[zacmustang03]

I'd be worried about the fuel pressure drop. 55 to the "fixed" 32 is still unacceptable. It shouldnt drop more than 1-2 psi. Plus you shouldn't need 55psi of fuel pressure with 60s, 91, and 480hp.

Ya well the first couple pulls it was falling on its face like 55 to 20 or lower. Im not sure what he messed with in the tune but after that the rail pressure went to 32 and was steady like no waver what so ever. I have a stock cobra hat with the pprv would that cause the drop like that? The pumps should be more than sufficient for the car . Would a faulty fpdm do that? Maybe it's cutting out on the top end and then running only one pump up top. It was def worrying me as well

 

[SVTORANGE]

Awesome setup man:beer:

 

[Mystic03]

So was it the bosch o2s the problem?

 

[zacmustang03]

So was it the bosch o2s the problem?

Yes thats right I hadnt updated anyone. The 02s were bad yes. The original email tune I had to get the car on the trailer was pretty out the car was running super rich. When we pulled the sensors out they looked full of carbon. We replaced them and everything straightened out. Car is real smooth through the rpms and even with a broken trans it pulled like a raped ape.

 

[Joyrider564]

32 psi fuel pressure seems low. Isn't base 40 psi and should rise with boost 1:1?

 

[zacmustang03]

Awesome setup man:beer:

Thanks! The car is alot of fun pulls hard. I actually got a chance to pull with a new 5.0 down the highway I didnt have 3rd just 4th . He was runnin a vert bone stock looked like he was moving the car was full of stuff but I walked him pretty good. Definitely happy with the car.

 

[zacmustang03]

32 psi fuel pressure seems low. Isn't base 40 psi and should rise with boost 1:1?

I was told 38 is normal nothing below 32 . But it worried me until I watched the pressure gauge on the rail and it seemed steady at 32 every pull. Im not sure what would cause the drop tho

 

[Mystic03]

I was told 38 is normal nothing below 32 . But it worried me until I watched the pressure gauge on the rail and it seemed steady at 32 every pull. Im not sure what would cause the drop tho

Runnin outta pump it sounds like but didmt see a modded fpdm in your list

 

[zacmustang03]

Runnin outta pump it sounds like but didmt see a modded fpdm in your list

Ya I am running a duel fpdm with separate wiring to each pump. Car shouldn't be running out of pump with duel 255s only makin around 500rwhp .