LQ9/243 swap throttle body size ......
05-03-2019, 11:29 PM
#1
LQ9/243 swap throttle body size ......
So recently I’ve went from a 5.3 with cam and milled heads with blower (11psi) 90mm tb
to a totally different setup
lq9/243 heads but with ls9 gaskets arp bolts- BTR STAGE 3 truck cam...and stock 78mm tb
my ve table i took a lq9 file and added 15% to 3600 rpm- for above that I added 20% (still running lean needing 30% more on top end )
Running 42lb marine injectors... I believe I have it setup right . I reduced timing 5 degrees off low octane table (matched both to do ve)
im shifting at 6k- speed was 49mph to command shift (5560 ish)
It seems I’m running out of air past 5800rpms
so im running stock intake with stock throttle body.... is it to small seeing most run newer on iron ls2 setups. Or would my 3” intake tube be restricting me? I usually run my trusty 4” pvc setup, this time I didn’t.....
cruising went from 16% of fuel needed on LTFT (up to 3600) down to 3% in two logs
my high rpm concerns me with high compression and fuel vs spark
1999gmc Sierra 2wd ecsb
lq9/243 ls9 gaskets
BTR stage 3 truck cam
65e still w/3.42 gears 295/45/20
long tubes/ ory
to a totally different setup
lq9/243 heads but with ls9 gaskets arp bolts- BTR STAGE 3 truck cam...and stock 78mm tb
my ve table i took a lq9 file and added 15% to 3600 rpm- for above that I added 20% (still running lean needing 30% more on top end )
Running 42lb marine injectors... I believe I have it setup right . I reduced timing 5 degrees off low octane table (matched both to do ve)
im shifting at 6k- speed was 49mph to command shift (5560 ish)
It seems I’m running out of air past 5800rpms
so im running stock intake with stock throttle body.... is it to small seeing most run newer on iron ls2 setups. Or would my 3” intake tube be restricting me? I usually run my trusty 4” pvc setup, this time I didn’t.....
cruising went from 16% of fuel needed on LTFT (up to 3600) down to 3% in two logs
my high rpm concerns me with high compression and fuel vs spark
1999gmc Sierra 2wd ecsb
lq9/243 ls9 gaskets
BTR stage 3 truck cam
65e still w/3.42 gears 295/45/20
long tubes/ ory
Last edited by trxmxzx; 05-03-2019 at 11:39 PM.
05-05-2019, 05:20 PM
#4
OK So I had some time today to tinker.... about 100 miles worth
I have my fuel trims doing great all under 5% my PE is at 12.8 afr throughout ... It still feels to fall off after 5600 rpms- I tried pulling 5 degrees and then adding 2 from original start thinking it may help. Maybe im missing something in the software. I adjusted shift point back just so it wouldn't take so long to shift
Attached is my last log and last loaded tune. I'm doing the tuning off EFILives Calc.MAFT filters and logging. (be able to tune VE table and MAF- CL or open and PE in a few logs)
Any input would be awesome... Im a Newbie at the hidden details inside programs
I have my fuel trims doing great all under 5% my PE is at 12.8 afr throughout ... It still feels to fall off after 5600 rpms- I tried pulling 5 degrees and then adding 2 from original start thinking it may help. Maybe im missing something in the software. I adjusted shift point back just so it wouldn't take so long to shift
Attached is my last log and last loaded tune. I'm doing the tuning off EFILives Calc.MAFT filters and logging. (be able to tune VE table and MAF- CL or open and PE in a few logs)
Any input would be awesome... Im a Newbie at the hidden details inside programs
