Set your knock recover rate to .25. This will bring back on the timing real quick once knock is not being detected. It'll help you figure out exactly when/where it's kicking in.

 

Hi
Thanks both, i already log g/cyl so could take out timing there but i thought 20 at that boost level on our 99 ron (your 93 equiv) would be ok.
Also getting knock at low rpm, but my timing was low around this area so have now blended 2002 corvette up to 2000 rpm which is higher timing...hoping to reduce knock by increasing timing in these areas....
What would be knock recover rate in EFILIVE?
Regards
gav

 

I use Efi Live almost exclusively. I said set it to .25.

 

HI, you mean this table up figures to 0.25 ?

 

Yes..

 

20 ° at that boost level may be fine at 4500 but maybe too much at 3800 , generally speaking don't increase advance to reduce KR

 

I had look at a current tune , without knowing the g /cyl id say i run less timing at that rpm /boost and I have 9.4:1 compression. BUT , I'm at 4500 lbs street driving - definitely a factor

 

I just scrolled up. Stop trying to do it in 5th. Get the tune sorted in lower gears.

 

@Forcefed86 Thank you for that- I'm building a 5.3 (sloppy stg II, Wilkes CNC'd heads, VS gen2.5 7875 dual v-band, etc) that I intend to run less than 10 psi- I have a brand new Tial MV-R 38mm that I didn't really want to sale and lose money on...so I'll buy another just like it.

 

Its likely phantom knock anyway. Though if you are starting at low RPM in 5th gear it puts a TON of unnecessary stress on the motor and may actually be knocking. Id start at 4k in 3rd gear and then go WOT. See what knock looks like then. Pull the plugs and look for signs of detonation. If you see none you need to bump the detonation threshold up. TONS of things can cause noise and set off knock sensors. rigid mounted engine/trans many times can't even use a knock sensor due to excessive noise/vibration being picked up by the sensor. Hard shifts etc can also cause it. Drop timing down to something stupid and safe like 10-12* at you current boost level. Make pulls in 3rd from 4k plus and look at knock table. If plugs still show no sign, bump the knock threshold up. until it reads clean on a pull. This is all easily adjustable in aftermarket ECU's. Not sure how its done on your ECU to be honest. I've never done it.

Good luck!

 

Hi,
Thanks Forcefed
Thanks for all advice everyone its really helped.
have since dropped the timing by one degree in all those areas and have set knock recovery to 0.25 as above.
Went out the last few nights and tried 4th and 5th gear pulls and no knock!
4th gear to 5000 (i know im taking it too slow..) was bloody fast and im only 2 psi.....
keep in mind my car weighs approx 1200kg...
Stock injectors still and only hit 70 to 80 % duty at the moment so they might last a full pull at 2psi.
Got to order new injectors from US when time is right.
Running out of hot weather to keep flooring it though this year.
Its certainly fun!
regards
gav

 

Have you got anyone over there can clean and flow test injectors? Can easily decap your stock injectors (lots of video on this ) which nearly triples the flow rate - no adapters , spacers and only need to change the IFR in the tune . Cheap and effective and will do what you need. Usually would need to flow test 2 sets to get 8 within 2% of each other. Have 2 projects running them - no complaints

 

I dont think so common over here, but have sent out some feelers...
not out in jt tonight and getting withdrawel already!
regards
gav

 

Hi,
got my FIC 60lb injectors coming this week, got tuning data from FIC.
Any tips for putting them in? Wifes lube on o rings...? Hehe
regards
gav

 

Defo a bit of lube needed!, once they’re in and the data changed make to check for air leaks (just in case you Knick an O ring)

 

Hi,
Altering my COS3 tune in EFILIVE for my change in injectors from 33lb LS2 to fic 60lb

If someone could just glance through it i would be very happy and install the injectors and fire it up.
Went with FIC 60lb ones.
I have a referenced FPR btw

Altered B4001 to 9.074 for all values which were 3.6172 - Injector flow rate g/s (not sure what the other table in the excel file means by scaled for 8 g/s limit 78%....?)

Injector voltage correction were all 1 anyway so left the same

B4003 is minimum injector pulse width(milliseconds) which seems WAYYYY different from my stock values... I have 1.276591, it says to change to 0.125 for all values....? Units seem the same...?
B4004 is default pulse width (milliseconds) which again is WAYYY different....i have again 1.276591 in all of those as well and guessing it means change them to 0.125 for all values as well??


B4005 is small pulse adjust adder, just copied column for column

B4006 is small pulse threshold, altered from 3.9 ish to 2.5 (injector short pulse in Excel spreadsheet from FIC)

Injector offset from excel copied to B3701 Injector pulse width voltage adjustment

regards
gavin

edit tune 23 is with new injector data

 

hi,
Thought i would update this a bit.
Injectors seem ok.
installed Cortex EBC.
programmed so it knows what gear i am in and in process of increasing boost in each gear.
1st and 2nd no boost required.
3rd had it up to 3 psi.....its bloody quick
4th and 5th had it to 3.8 psi so far
plan is 3rd up to 4psi and 4th 5th up to 7 psi ish....

Now the turbo....
yes i was told its a little laggy and would have been better with one in this thread but actually it works for me having a light car, if boost came on too fast would probably spin out.....?
probably a lot more in the tune to go which may help spool and also im on the basic settings in the cortex so far and there is settings which could help spool
im around 40 ish duty cycle so far in cortex which nets me 3.8 psi.
im just upping duty cycle slowly keeping eye on spark and AF ratio, aiming for 11 to 11.5 ish
Dont know really if im too conservative but this is a LS! SBE with stock heads and compression (10.2?) on 99 pump gas (US equiv 93)

My running gear is Jaguar XJS with 3.54 diff which is now whining lol.....thats another story....
Have attached latest log and tune with BEN factors applied and returned mixture areas back to 14.63 (COS3 tune efilve) which is semi open loop? so any areas set to 14.63 will turn on Oxygen feedback from sensors in those cells.
My reasoning behind this i still want it to pass emissions and also have another problem
If im idling for some time the AF goes lean if open loop, or if i start the engine after a short stop my wideband reads 20 until the NB 02 sensors pull it back down.
If this is heat soak im not seeing it in the tune though as the IAT does not increase much at all. Any insight into this would be greatly appreciated.

In short love the Turbo and really only comes on boost if floor it. Would i have just been better with heads and all bolt ons ? dont know but its been an adventure and cost me less than top of the range bolt ons.

Dont know what im putting down with 3.8 psi? any guesses to the tyre?
Will get it dyno when reach 7 ish but summer and chances running out fast with other things going on.
Regards
Gav

 

 

You have more will power than anyone i've ever met with a turbo car! You've had it up and running for how long now? And you haven't gone above 4lbs? I'm impressed! That turbo isn't even in its happy spot until 14-15lbs IMO. To say you have a lot left on the table is an understatement. Beautiful car! I'm sure it scoots, even at 3.8lbs. Lowest my gate allows me to go is 7lbs. I went 9's @ 138 mph in my feather weight on wastegate at 2400lbs. Might consider a set of nitto 555r drag radials. Looks like you have a street tire on it?

Whats teh motor setup again? Generally you make around 20hp per pound on mild 300ish NA hp 5.3. So under 4 lbs you likely adding about 70ish hp. Id put 15lbs to it personally. Should roughly double the NA power there.

 

Hah, just can't afford to blow it lol!
eagle f1 tyres 255 40 17 on rear.
As said it is still stock rings, pistons etc.
if we could get engines as cheap and easy as yourselves in US then maybe another story....
I can get 275 40 17 r888r tyres for 200 UK pounds each but may rub....also probably break the diff or something else....
Btw your light car, what was on rear setup?
regards
gav