lol..looks like we both had problems posting this last time

 

Very interesting reading, thanks guys. I have a set of 550cc injectors and a walbro fuel pmp but do not have an adjustable FPR, sounds like I should purchase one.

 

If the poster is looking for a low cost solution, than installing low comp pistons certainly isnt the appropriate path to take.

You can tune cars without return fuel systems, and some lucky people will have great results. But I firmly believe, that a return fuel system is the CORRECT way to fuel an FI car. In a lot of words, Phunk explained why. At lower boost, a return fuel system is probably OK...but that doesnt mean its the BEST way, or the safest way. A lot of things have been done by people on the forums, but that does mean its safe, or correct, for the long term.

FI adds a significant element of risk, and if you dont have the means to repair potential damage, then its best to setup your kit correctly, and properly, the first time around. Moderate boost, a return fuel system, correct EMS, and a solid tune....is the receipe for safe and longer term FI operation on a stock block.

 

Sharif and Phunk
Maybe one of you can explain how TN can get away with a flash and 9psi , with the walbro and 380's or 440's what ever they use . ANd a guy with a SC running the same walbro , injectors , and boost and that boost isnt till close to redline ? Is it the the Vortech is flowing more air at 9psi than the TN turbo kit is ?

 

having never worked with a TN car that is using their fuel system or flash, i cant really answer that. I would figure they are moving about the same ammount of air since a Vortech makes, what, 390-400rwhp at 9psi? Consider the massive parasitic losses and the engine is working as hard as a turbo engine at 430-440rwhp. I dont even know what a TN car makes at that boost for power... but as you know, no matter what system you have, the fuel system has to be able to match the airflow... im not sure really whats going on in there having never worked with one.

 

Thanks
Then I still would suggest to sja177 , that he go back to the stock 3.33 pulley untill he can afford a return fuel system

 

Well, the TN kits "out of the box" with reflash are pretty hit or miss. Some of them are pig rich, and others run a little on the lean side. There is no consistency. We usually install return fuel systems, and UTEC's or EU's on them, and return....run just fine with plenty of fuel to spare.

Wish I had a better answer, but thats about it. Also keep in mind, that the reflash process might have some limitations that the UTEC and EU dont.

 

Thats what I dont understand...why they keep flashing for these kits knowing it more than likely it will be lean up top

thanks Guys

 

Thx for the help guys....
I believe Technosquare knows what they are doing, so I am going to have to assume that the reason they could not tune my 3.12 and walbro/440's is because I really do need the return fuel system, so I went ahead and bought one.

On another note to booger:
The tuner at technosquare said that my car was pushing more power than any other vortech car they had in their, he said that it was just pusing way to much air and he simply couldnt get enough fuel up top.
The way he explained it to me was kind of a, well theres good news and bad news, he said the car was too fast, and too lean, lol

Now I dont know how many vortech cars go to technosquare with my setup, but he was stumped as was I, because we both knew that 440's should cover anything that vortech can push. I am a little surprised that he did not consider a return fuel system. Nevertheless, I ordered the AAM from ForgedInternals, and when I put it in and retune at technosquare, I will finally dyno.

 

So do you or do you not have a walbro right now?

 

he has a walbro

 

Sorry, I do have the Walbro as well,

I actually bought the tuner kit from CP Racing and they suggested that I also buy the 440s and Walbro since I was going to run the 3.12 pulley, he said that this was the setup that everyone with the vortech tuner kit was using.

I hope people with vortech tuner kits are reading this, because if they are running the 3.12 pulley, they NEED to have a return fuel system or an alternate fpr I guess.
Now that I think about it, a lot of the maxima guys run the 3.12 pulley and none of them used return fuel systems, so im abit confused as to how they mange to run 10 psi with an fmu, auxillary, and stock fpr and stock injectors,

Do you guys know if the vortech ppl with the fmu and 3.12 are running lean up top as well??

 

OK then I am surprised they coul dnot tune it, we did one as I mentioned and could not tune it due to the MAF signal running out of space to tune so we added 380 injectors and a Walbro and that did it, then we had plenty of MAF signal to play with and tune it, that was with the SS

 

http://forums.maxima.org/showthread.php?t=360493

Ok, so I go over to maxima.org, and I look at the dyno section, the first guys mods include a "Weapon R adjustable fpr" but he has no afr on his dyno,

The second guy, Iansw, does not appear to have a different fpr or a return system, he was tuned by JWT and just look at his afr, how has his motor survived? Hes running the 2.87 pulley at 13psi!!!! with an afr that goes from 9:1 to 14:1 Id imagine his top end would look something like mine if I were to dyno

 

Were you running the 3.12 pulley as well? Maybe someone who knows more about technosquare will chime in.

 

I can't remember which pulley it was but I think it was the next size and were boosting to around 10 psi

 

is there a possability that TS doesn't have the full capability to tune that piggyback would be capable of?

Because there's been people running 420whp on the vortech with cams and a whole slew of bolt on parts without a fuel return system and only the SS box

 

Glad to hear you are going to get it taken care of ASAP . Take it easy till then

 

Of course a blower car is going to eat up more fuel than a turbo car. Just like a walbro 255 is good to about 600whp on a turbo car and only 520whp on a blower car. Same thing goes for the injectors. At the same airflow level the blower car will make less power. No doubt about that.

 

In theory, some power will be lost due to parasitic losses, which would mean that an SC will run out of fuel sooner than a turbo setup.