LQ4,milled 317s, Crane 228/232 dyno
02-03-2013, 06:01 PM
#1
LQ4,milled 317s, Crane 228/232 dyno Finally went to the dyno on Friday with my 81Z28 LQ4 swap. This is definitely not the ideal setup for making the most power but I need to get a tune until i can complete the top end the way I want to.
Here's the specs:
Rebuilt 2001 LQ4 with 317 heads.
Standard bore ARP everywhere
Heads milled .020" compression ~ 9.75:1
Crane 228/232 cam .600/.600 matching .650 dual springs
LS1 car intake, throttle body, 28lb injectors (for now), Walbro 255 in tank.
1 5/8 homemade long tube headers ( I know, I'm cheap), full 3" exhaust with Dynomax ultraflow welded mufflers and full tails.
th350 w/3000 stall, 4.10s
The dyno is a Mustang 1100se model. It's a bit of a mish mash but the bottom end is built tough and this will mainly be a baseline. I'll add some AFR's and a FAST 90/90 combo with some Dynatech headers when the money tree grows in the back yard.
It was a long day and we had issues. The o2's weren't reading down low(too cold and not swithcing?) and the car was running super lean. The stock injectors are at 97% LOL. I kind of figured that much. My AFR is not where the tuner wants it. It seems to be erratic with every pull and is not where he is commanding it to go. It seems to hit 13.1 on the top of 2nd gear and will climb further lean in 3rd.Both facts suggest that my 2000 vette o2's should be swapped for some F-body ls1 units. Anyways here's the dyno sheet:
Pulls were done in 2nd gear so I'm not sure what a 3rd gear pull would look like. I pretty happy so far and the tuner figures another 20 - 30 rwhp with some 36 lb/hr injectors and new o2's.
Here's the specs:
Rebuilt 2001 LQ4 with 317 heads.
Standard bore ARP everywhere
Heads milled .020" compression ~ 9.75:1
Crane 228/232 cam .600/.600 matching .650 dual springs
LS1 car intake, throttle body, 28lb injectors (for now), Walbro 255 in tank.
1 5/8 homemade long tube headers ( I know, I'm cheap), full 3" exhaust with Dynomax ultraflow welded mufflers and full tails.
th350 w/3000 stall, 4.10s
The dyno is a Mustang 1100se model. It's a bit of a mish mash but the bottom end is built tough and this will mainly be a baseline. I'll add some AFR's and a FAST 90/90 combo with some Dynatech headers when the money tree grows in the back yard.
It was a long day and we had issues. The o2's weren't reading down low(too cold and not swithcing?) and the car was running super lean. The stock injectors are at 97% LOL. I kind of figured that much. My AFR is not where the tuner wants it. It seems to be erratic with every pull and is not where he is commanding it to go. It seems to hit 13.1 on the top of 2nd gear and will climb further lean in 3rd.Both facts suggest that my 2000 vette o2's should be swapped for some F-body ls1 units. Anyways here's the dyno sheet:
Pulls were done in 2nd gear so I'm not sure what a 3rd gear pull would look like. I pretty happy so far and the tuner figures another 20 - 30 rwhp with some 36 lb/hr injectors and new o2's.
02-04-2013, 07:36 PM
#3
Yeah the torque numbers don't make sense. I asked the tuner and he said they would have to be repeated a few times to be justified. The first pull before tuning was 35x rwhp/ 38x rwtq and with minimal tuning we hit 369 rwhp before we quit. I'd say the torque is more like 400.
02-10-2013, 04:09 PM
#7
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02-10-2013, 08:59 PM
#9
Cam LSA is 112.
This is a non-locking converter. The first pull was 385 rwtq so I figure it has to be close after we picked up 20 rwhp from tuning.
I would love to have 487 rwtq but it must be the way it was driven on the dyno.
I am happy with the rwhp number without most of the hp essential supporting mods.
This is a non-locking converter. The first pull was 385 rwtq so I figure it has to be close after we picked up 20 rwhp from tuning.
I would love to have 487 rwtq but it must be the way it was driven on the dyno.
I am happy with the rwhp number without most of the hp essential supporting mods.
Last edited by Zedzag; 02-10-2013 at 09:07 PM.
10-08-2013, 11:37 PM
#16
Didn't get the results I was looking for - the dyno software was crashing on every pull and giving us an error message. The good news is that after all the new mods the car feels stronger. We spent a bunch of time tuning for driveability and data logging. Fuel and timing curves look realy good and the car is much more crisp and responsive. Once the software is fixed I'll head back for a few pulls.
10-09-2013, 07:42 PM
#17
Launching!
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somebody correct me if i'm wrong,but I believe doing the pulls in second gear will show lower #s than in 3rd gear.nonetheless,it looks like a strong runner!
