K, guys just had my car tuned after having installed the 440cc injectors, Walbro 255 FP, and 3.12 pulley. She is putting down 386whp now (will post dyno results tonight). Now there is a few more things I want to add, just wondering what you guys think I should do in order of importance of the following:

-CJ Fuel Return System
-Tranny Upgrade
-ECU Reflash

 

why do you need the ecu flash at this point after being tuned and working fine? why are you wanting the CJ return system when 386whp is perfectly fine on the stock vortech fuel system?

 

I have no idea lol! Thats why I was asking, so your saying if everything is running cool now I dont need any of that stuff? Works for me, I can get rims now lol

 

yeah i'd leave everything alone if you just got it all working. I don't know what tranny you have - auto or manual, but you might consider upgrading the auto if that's what you have just to make it shift faster so you don't accidently go past redline because it was too slow to shift in the lower gears.

If you have a manual, the stock clutch and flywheel are perfectly fine on a vortech setup unless you just want a lighter clutch and flywheel for faster reving or you plan to make a lot more power than 386whp. Even still, if you're happy with the stock clutch I'd leave it until it dies

 

Yeah I have an auto, and have had that late shift happen before. Thanks man!

 

ECU flash since the SS box only controls fuel in boost. Running the bigger injectors with no way to tune them out of boost is no good. I will be doing this soon as well for my 440s.

 

I thought the SS box can adjust timing

and I was figuring if his car was recently tuned and running great - figure if it ain't broke, don't fix it.

I don't have any personal expericence with the SS box, but it seems strange that some people are getting the 440 injectors to work with flying colors and other people are having problems scaling them and getting them to work right with the SS box - could it be a revision of the SS box or something?

That said, I think the ECU flash for the injectors specifically will almost always make the car start and idle smoother and overall probably run a little better than relying on a piggyback to scale to them

 

- ECU flash defenetly
- 5/16 spaver or a upgraded manifold if u dont have one
- fuel retun not really necessary


- tranny holds for me since its a SC the torque is not too high

look at my sig

 

and the ECU flash will increase ur idel and redline witch will give you allot more power

 

Do you have a fuel pressure gage and what is it reading if you have one?

 

wait a minute there, how's a higher idle going to increase power? It's just a higher idle

a higher redline might increase power some, or it might not - it completely depends on your car and mods. Even though the vortech will be pushing even more boost at a higher than redline rpm, you have to think if you actually want to even go there. The vortech can make a LOT of boost around redline and taking it beyond redline means even more boost yet depending on your breathing mods, you might make a little more power, or you might stay flat with HP or even gradually start to drop in hp.


that's a good point. If the pressure is really high, then maybe it's time to consider a better fuel system. But I'd bet it's probably within acceptable limits - especially these days with the revised fuel pressure that newer vortech kits have

 

Bad assumption about "within acceptable limits".. I have the same fuel set up and mine reads 80psi at idle and slightly lower during normal non spirited driving.. If you don't make the mod's recommended by the Turbonetics install man. to the fuel pump and Phunks recommended mod to the swirl jet you wind up with 80 psi..

 

The ECU flash does not increase idle rpm. The cypher (sp)tool does allow about a 100rpm increase.

 

I dont know what it is that makes tuning the fuel in the vacuum side of the map so hard . But it maybe that the ECU is always trying to adjust it back to where it is originally set up to run . With 440's you maybe able to do it because the gap between stock inj. and the 440's isnt as wide as stock and 550's . Having the ECU flashed for your injector size , is the best and easiest way to do it . Then you can use the SS box to tune the fuel and timing

 

Forget to mention my other mods are 1/2inch MD Plenum spacer, Alphawerks headers, Test Pipes, Stillen TD Exhaust...

 

Revised fuel pressure? What are you speaking of? Disks in the FMU?

 

im pretty sure the ECU flash allowes u to raise idle. im sitting at 1050 idle right now from the flash

 

Like Sentry said . If your tuned and running great . No NEED to get a return fuel system . If Vortech didnt think running an aux fuel pump with a FMU wasnt safe , they wouldnt have done it that way . Vortech started [ early kits ] with a 8 to 1 FMU . Which puts your fuel preasure well above 100psi @ 9psi . The later kits came with a 6 to 1 FMU which keeps fuel preasures lower , but may not supply enough fuel in the upper rpm's . I still have a hard time believing that last statement though .

A tranny upgrade....Trq. converter , valve body and a total tranny upgrade are good options

If your ECU isnt flashed for your 440's I would think about doing that . It should improve idle and normal driving quite a bit .

 

you'll probably need a retune if you get the ECU flash for the bigger injectors. But really 440's aren't all that much bigger than the stock ones - I mean, it isn't a huge amount to scale them.

 

Ok didnt have a chance to post the dyno results last night. But there is actually a problem. Turns out that at about 5400RPM to Redline she starts gets lean, like 12.8 lean! Everything before that is perfect, and obviously Im not going to take her in to dangerous territory. Basically they are telling me the only way to resolve the issue is with a Fuel return system... I'll try to post graphs tonight so guys get a better idea.