So I finally got the car up and running, going to dyno on Monday, but I was wondering what afr you guys are at?

I got it tuned by technosquare, and when the tech came to talk to me about the car, he said the car was detonating alot after 5000 rpm, so he pulled back the timing, but AFTER 6000 rpm he said there wasnt enough fuel to go more than 12 to 1 afr
I have the Walbro and 440cc injectors. He was puzzled as to why he couldnt get more fuel, so Im thinking that maybe something is wrong with the install.

I have the innovative wideband, and when I get on it, the afr is in the 11's until about 5800-6000 and then goes to 12.0-12.3 to redline.

Also Im not sure, but I think I hear a tapping noise after 6000rpm as well. But how could it be knocking if the guy just tuned it right?


My engine mods:
vortech, 3.12 ~9psi
stillen headers, high flow catts, borla td
walbro 255lph, rc 440cc

 

Also, does that mean my duty cycle is at or near 100%??
What should I do guys?

 

You are not the first one to have this problem . A bunch of guys have tried to have TN , and AAM flash the ECU to tune for thier SC and the same thing happens .They get lean up top .
Some one correct me if Im wrong about any of this . But your MAF can only read so much air being pushed in the plenum . And the ECU is only supplying fuel for the max air it is seeing coming into the plenum . If you were on the 3.33 pulley and making 7-8psi it would work . But the ECU isnt seeing that extra air flow produced by the increased psi and flow .
You could do 2 things...go with a return fuel system , AND OR get a EMU and tune the car to MAP instead of MAF which any FI car should be tune with MAP.
Do you still have the SS box that came with the Kit ?

 

No I dont, it was the tuner kit, my brother said I could use his Apex's AFC, do you think that would work?
Thx for all the help booger

 

Salutions for it maybe better answered by some one that knows much more than I do . Me personally ...I would rather have a EMU thats able to be tune locally by a good tuner . If you make changes later , the tune can be changed to fit the mods added

 

from what I've read when the A/F goes back up towards redline it means the fuel system isn't up to par. Since you have a fuel pump and injectors, I think you need a return fuel system. I think I remember Sharif saying you don't want to upgrade to a larger fuel pump without a return system, but maybe with larger injectors it's ok? I dunno. That would be my guess anyway

That and I'd get some sort of piggyback on the car as well and get it dyno tuned.

I'm assuming TS street tuned the car for the A/F?

 

I believe there are one or two SS boxes for sale in the classifides . The return fuel system will cost you around $1000 . If you cant come up with a couple thousand to do it right and right now . I would put the stock pulley back on and go to TN and have it reflashed for it . Cheaper now and you can save up for the Fuel system and EMU .

 

Damn,
I cant go back to the 3.33 pulley, im LOVING this power : >

Do u guys think I will be Ok with a 12:1 afr from 6000-6600

 

Ask your self....do you really want to take the chance ? If you end up breaking a ringland and the piece that breaks off gets caught up in the valves.... you'll have more money to spend .

 

Hey booger what if I run with a little mix of race gas daily,
I dont drive the Z more than 10 miles a day.

 

Not trying to scare you into changing back . But if you cant afford to make it safe now . Make sure you have a motor left when you do . you may get away with it may not

 

Of course that would help...if you can afford it

 

race gas will prevent detonation, but not heat build up - which can lead to detonation, but given it's just 10 miles a day I'd say you don't need to worry about that too much.

Yeah get some race gas at the very least. I seem to remember there being a reason for needing a return fuel system when the bigger fuel pump start pumping fuel in case it pumps excess fuel or something that it has a way to even out the pressure or something. Otherwise you get uneven fuel pressure and maybe at higher rpms the system can't react fast enough with the stock system? Don't hold that as fact, I'm just reciting what I think I've read

 

Fuc* Im so pissed, my afr was at 12.0-14.0 from 6000-redline tonight wtf

I dont know what to do, im getting sick of all the problems with this kit, vortech is supposed to be reliable, and fairly easy to get going. Ive spent $800 at technosquare, and its going to be all for nothing.
IS THERE ANYONE OUT THERE WITH A VORTECH TUNER KIT, AND 440CC INJECTORS AND TECHNOSQUARE REFLASH?????

 

Ok...dont boost that thing above 5500rpm untill you get it resolved . You got a tuner kit . And it needs more than what it comes with and you knew that going into it . The TS flash is only good enough for 7 maybe 8 psi of boost . If you have the bigger injectors and pump . I would look into seeing if just finding away to increase fuel preasure a little will take care of it . TS can reflash once you do that and they will not charge you as much as the first time . Pm Sharif and see if the preasure in the stock fuel preasure regulator can be raised . Or if a after market FPR can be added to increase preasure.
Like I said in the other thread . They shouldnt be flashing for these kits if they know before hand that the MAF will be maxed out and you will get lean up top . Unless they tell you that it can happen before hand and give you options to solve it if it does happen .

 

Without the Vortech FMU (fuel pressure riser), and inline booster pump you are going to run way lean. As Booger mentioned, you need a return fuel system badly. Please dont drive your car past 5000rpm or else you will break something.
Link to return fuel system: http://www.forgedinternals.com/store...cat=251&page=1

 

thanks

sja177...go back to the stock 3.33 pulley untill you can afford a return fuel system .