Bored. So im bench racing again
#1
Bored. So im bench racing again
Ok so lq4 torquer 2 cam stock 243s ls6 intake. 1 7/8 speed engineering long tubes. Thoughts on power at the rear tire? Would having the heads ported by tsp to a stage 1 be worth it. Want to get the car into the 10s on a 175 shot. Im torn as i have the funds to take the heads to tsp but i have been not been able to play with it for a year so i am itching. I figure the port job is good for 30-40. Im just wondering if the unported heads with say a .041 head gasket is capable of making 400 plus at the tire.
#2
TECH Fanatic
iTrader: (19)
This is some serious bench racing. How can anyone guess power at the tires without knowing what kind of trans, clutch/converter, driveshaft, shift points, launch rpm, differential, or tires?
Through a T56, stock shaft, 12-bolt 3.73 spool... yes 243 heads can easily cover 400whp before nitrous.
Through a T56, stock shaft, 12-bolt 3.73 spool... yes 243 heads can easily cover 400whp before nitrous.
#5
TECH Apprentice
I love bench racing. I'll bet you can get at least 400 rwhp before porting the heads. I didn't realize you could get 30-40 rwhp from a port job on 243's. If so it would probably be worth it, especially if the engine isn't in the car. What does the car run in the quarter now? Presuming full weight and no tire spin, I guess mid-10's.
#6
I'm going to say right at 400 with that intake holding you back. Have you thought about going LS3 heads and intake instead? If your ride is light and you don't mind losing some low end power a cheap set of ported LS3/L92's would net a very healthy gain on the top end.
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#8
ok so with the lq4 torquer 2 and 3200 stall and still on manifolds and cats, (was in a rush to get the car back together and low on funds hince no longtubes) this is what it ran first run is on right second is on the left. Not to enthused with it. I do not see it with the exhaust and 243s and the nitrous quite gettting into the 10s. thoughts? I also think it is down some mph. I was on the drag pack also. 275/60 radials and 26 in front runners
#9
TECH Apprentice
Had to wait awhile for that second run? I know I waited three hours for a second pass Friday night.
Your mph is indeed low. That's about what mine traps with 285 rwhp at 3,285 race weight and at a similar ET. Your exhaust must really be a big restriction and/or maybe it's a tune issue as well.
Your converter may be good for a decent shot of nitrous but you need a looser converter if you want better n/a times.
At least you have a starting point.
Your mph is indeed low. That's about what mine traps with 285 rwhp at 3,285 race weight and at a similar ET. Your exhaust must really be a big restriction and/or maybe it's a tune issue as well.
Your converter may be good for a decent shot of nitrous but you need a looser converter if you want better n/a times.
At least you have a starting point.
#11
TECH Fanatic
iTrader: (19)
Dude, you know as well as anyone these motors need to breathe.
Slap on whatever cheap longtubes come across for a steal and put the bottle on it.
LQ4 with 243 under LS6 intake is still a lower compression (heavier) LS2 equivalent. They can put down over 400whp through an auto, that's not your limiting factor right now.
Slap on whatever cheap longtubes come across for a steal and put the bottle on it.
LQ4 with 243 under LS6 intake is still a lower compression (heavier) LS2 equivalent. They can put down over 400whp through an auto, that's not your limiting factor right now.
#12
slp lid that was on the car, has that ram air thing under it. Has a bullet on it. 342 gears. car weight 3730 with me in it and just the driver seat. Still on a conservative tune from when I just needed the car to be back and running for school. But now since I have the white formula I am gonna be trying to play with this car some more now
yea i made at pass when they opened and waited till like 11:30 to run a bud in his nitrous camaro.
We got the second pass rather quick as we went to the slick radial lane. Working on getting the headers I picked up put on but didn't want to do that till I did the heads which I am still waiting to see if I am going to have ported and milled .020 or .025. Also wanted to have that all done when I got it tuned as well so I could just knock it all out in one shot.
You guys thinking dropping to a 26 in rear tire would help any. the radials I have are soon to be needing replaced.
yea i made at pass when they opened and waited till like 11:30 to run a bud in his nitrous camaro.
We got the second pass rather quick as we went to the slick radial lane. Working on getting the headers I picked up put on but didn't want to do that till I did the heads which I am still waiting to see if I am going to have ported and milled .020 or .025. Also wanted to have that all done when I got it tuned as well so I could just knock it all out in one shot.
You guys thinking dropping to a 26 in rear tire would help any. the radials I have are soon to be needing replaced.
#15
- Compression Ratio of Various Combos
LQ4: 9.41:1 - milled .020" = 9.74:1 - LQ4 with LS6 heads = 10.14:1 - milled .020" = 10.53:1
- LQ9: 10.04:1 - milled .020" = 10.42
- LQ9 with LS6 heads: 10.88:1 - milled .020" = 11.34:1 LQ4 with 821/823 heads: 9.72:1 - milled .020" = 10.07
- LQ9 with 823/824 heads: 10.38:1 - milled .020" = 10.80:1
LY6 9.6:1 - milled .020" = 9.95:1 L92 10.5:1 - milled .020" 10.91:1
each .006" milled = 1cc combustion chamber space is the often quoted equation.
Various Cylinder Head Combustion Chamber Size:
317(lq4/lq9) casting: 71.06cc 243/799(ls6/ls2/l33) casting: 64cc 823/821 (ls3/l92/ly6) casting: 68cc 862/706 (5.3 lm4/lm7) casting: 61.15cc *Reference link: http://juicedmotorsports.com/techinfo_LSX_heads.html