Lean, why?
#1
Lean, why?
So, I'm sort of lean in boost. So either
1) My new 3" flows so much better, I just need more fuel
2) My fuel system is dying
3) Something else?
Things changes so far:
- 3" full exchaust with new CAT.
- EBC ripped and MBC in
- new wastegate actuator (more psi)
So?
I did a small VE analyse and this came out:
(OLD vs NEW)
1) My new 3" flows so much better, I just need more fuel
2) My fuel system is dying
3) Something else?
Things changes so far:
- 3" full exchaust with new CAT.
- EBC ripped and MBC in
- new wastegate actuator (more psi)
So?
I did a small VE analyse and this came out:
(OLD vs NEW)
#4
Supporting Vendor
iTrader: (3)
Join Date: Jul 2006
Location: San Diego
Posts: 3,303
Total Cats: 1,216
Well, first of all if you changed the setup, it's perfectly normal to need to retune.
When I went from my 2" cat/2.25" exhaust to the current 3" exhaust I had to retune the whole table for the new setup.
Also consider, if you changed the boost, you may be in fuel cells now at max boost that you were not in earlier - these cells may not be tuned because you weren't hitting them before thus not tuning them. You need to tune them.
The larger exhaust means faster spool. This means that you get higher in the fuel table earlier - again, an area of the VE table you weren't hitting before, so new cells that have yet to be tuned.
If you change anything that alters the behavior of the air pump that is your motor, you will need to re-tune the fuel to have correct AFRs.
-Ryan
When I went from my 2" cat/2.25" exhaust to the current 3" exhaust I had to retune the whole table for the new setup.
Also consider, if you changed the boost, you may be in fuel cells now at max boost that you were not in earlier - these cells may not be tuned because you weren't hitting them before thus not tuning them. You need to tune them.
The larger exhaust means faster spool. This means that you get higher in the fuel table earlier - again, an area of the VE table you weren't hitting before, so new cells that have yet to be tuned.
If you change anything that alters the behavior of the air pump that is your motor, you will need to re-tune the fuel to have correct AFRs.
-Ryan
#7
Re-tune already planned for mid-April.
A full half? 1.5 or .5?
Max boost has not increased, around 1 bar/15psi still - just more stable thanks to MBC and the new can. But I am probably higher up in the VE table sooner. I will keep a low until it's tuned.
Should I have them check fuel pressure just to be safe or something? What should they check around 90 PSI at baro if I remember?
full half point
Max boost has not increased, around 1 bar/15psi still - just more stable thanks to MBC and the new can. But I am probably higher up in the VE table sooner. I will keep a low until it's tuned.
Should I have them check fuel pressure just to be safe or something? What should they check around 90 PSI at baro if I remember?
#10
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,507
Total Cats: 4,080
stock pressure is 35psi at idle and around 48psi at atmospheric unless you have a 99+
more power equal requires more fuel, if you added a 3" exhaust and raised your boost you are making more torque and need more fuel to support it. looks like you went to 15:1 when you hit 180kPa (11psi) so like, add fuel.
more power equal requires more fuel, if you added a 3" exhaust and raised your boost you are making more torque and need more fuel to support it. looks like you went to 15:1 when you hit 180kPa (11psi) so like, add fuel.
#16
So, MLV has done it's job, the car is in much better shape. Now that I've added alot more fuel (and air) I am curious as to what the rwhp and torque is going to be...
Note that I am running wastegate actuator only. I removed my MBC because with the new actuator i was doing 1,2bar. With the can only I am running 1 bar exactly and spoolup is excellent: 1 bar @ 3500rpm with 50% TPS
Note that I am running wastegate actuator only. I removed my MBC because with the new actuator i was doing 1,2bar. With the can only I am running 1 bar exactly and spoolup is excellent: 1 bar @ 3500rpm with 50% TPS
#19
Refabbed the air inlet plumming (new filter, MAF removed, cleanup). Then I notice the vacuum hose from the OEM FPR to the solenoid thing near the TB is lose. Reconnected and zip tied.... then Im lean <100kpa and rich above. Sounds plausible?
Spend the entire evening retuning and Im done now.
Spend the entire evening retuning and Im done now.
Thread
Thread Starter
Forum
Replies
Last Post