First drive in turbo project: Change gears?
#1
First drive in turbo project: Change gears?
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.
#3
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
#4
Restricted User
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.
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.
#5
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.
#7
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...
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#18
TECH Junkie
iTrader: (14)
If you know all this, I apologize, I just want to make sure you know the part in question.
#19
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.
I've seen a few times where laggy transient fuel enrichment has caused lower gear lag.
Gate seal would definitely cause it.
#20
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.
If you know all this, I apologize, I just want to make sure you know the part in question.