wildcamaro

iTrader: (15)

So after a lot of after work wrenching I finally got out to test and tune my L33/76mm/4 speed car. I am running the Fitech fuel injection with 4.5# gate spring and I was seeing about ~3# on my data logs with my cheap CXRacing intercooler. I am running a Borg Warner super t10 with 3.42 2.28 1.46 1.00 ratio, 28" tire, and 3.73 rear gear (yes 1st is pretty much granny gear lol). I was not getting any boost at all in first or second but it was coming in around 3K in third and fourth. I was running low boost just to sort the tune out but I am wondering if I am going to start seeing boost in at least second gear once I turn it up or if I need to mess with my rear gear to get more load. I have a set of 2.73s laying around so wanted to get guys opinions on if swapping them in will help my cause and get me boost in lower gear(s). This is just a street car but obviously I will end up running at track for the hell of it every now and again.

a05c

How much ignition timing is in it? What's the fueling looking like?

wildcamaro

iTrader: (15)

Fuel was solid throughout data log right around 12:1 in boost....I'm using MSD 6010 so I have 14degrees base, any vacuum and it adds 16 for a total of 30 and then once in boost I have it ramping down linearly to 14 degrees total @7psi, so at 3 pounds it probably has around 22-23

JoeNova

Timing is a little on the soft side. I usually run 18-20 degrees at 7 PSI.

You will likely see boost in 2nd with a better spring. A 4.5 lb spring is going to start cracking open as soon as you see boost, and 2nd gear won't load it enough to build any boost once the gate cracks open.

A stronger spring will help. So will a bit more timing.

wildcamaro

iTrader: (15)

Ok i will give that a shot, I plan on tossing in a 7-9 spring as my goal for now is to get 7 pounds at the engine since i'm not super confident in my transmission even though i have a mcleod super street pro clutch in it. I would like to drive it a little while to get tune right on before breaking trans and grabbing a TKO. Same goes for fueling, I dont want to turn it up right away because i am running a 380 AEM inline pump and want to be sure it can keep up with what i throw at it.

JoeNova

Lol, that 380 lph pump is most likely going to keep up with anything you can throw at it. I didn't have to kick my 2nd pump on until over 18 PSI.

wildcamaro

iTrader: (15)

ok lol good to know, I see a lot of varying opinions on fuel pumps and boost so i tried to go oversized for my application to be safe...I am only running -8 tank to pump and then -6 pump to throttle body due to the limit of the Fitech -6 inlet so i figured i would get some restriction...

JoeNova

You're not even close to topping out either the pump or the -6 line.
Put a real spring in that thing lol.

wildcamaro

iTrader: (15)

haha definitley getting turnt up tonight...

ddnspider

iTrader: (26)

12:1 A/F is a little on the lean side especially if you plan on "turning it up". I'd be shooting for 11.5.

wildcamaro

iTrader: (15)

the settings on the fitech are factory set at 11.5 when in boost, gonna check plugs but im thinking im gonna try a little higher boost and check data logs to see if it richens up, if not ill have to change the target afr to compensate

RealQuick

iTrader: (14)

Is the fire ring (valve seat) installed on the wastegate? Which 76mm do you have? Definitely something wrong.

RealQuick

iTrader: (14)

Oh, I would fix whats wrong instead of swapping gears. If the turbo is a T4, then I dont see why you cant generate boost in the first two gears.

Bad Apache

And unless you swap on some sticky tires, you're not going to hurt that Super T10. So no worries there. You'll see lots of tire smoke as it sits now!

93camaro_zzz

iTrader: (13)

I'm honestly surprised that FItech unit can hold up.

wildcamaro

iTrader: (15)

I was skeptical at first, but I've seen a few guys running 20+ on the bigger unit...I ran the Fitech NA and it ran much better than a carb so I figured I would give it a try with boost

wildcamaro

iTrader: (15)

Gate is PW46 and I assembled it the same way I took it apart after swapping springs...turbo is a CXRacing T76 ball bearing...I suspect that I'm not seeing boost because by the time it spins up I am shifting because of the super steep 1st gear especially

RealQuick

iTrader: (14)

The fire ring gets sandwiched between the flange on the hotside and the bottom of the wastegate (and forms a seat for the valve). It has nothing to do with the components on top of the gate (or inside the head of the gate like where the springs are). Make sense?

If you know all this, I apologize, I just want to make sure you know the part in question.

gtfoxy

Out of curiosity, is there a function in the Fitech that acts as an accelerator pump?

I've seen a few times where laggy transient fuel enrichment has caused lower gear lag.

Gate seal would definitely cause it.

wildcamaro

iTrader: (15)

Ahhh I understand what you are saying now and yes I am 99% sure it's installed but I'm swapping springs tonight so I will double check that