The LSXR is designed to be...
The LSXR is designed to be friendly to any power adder, so it features thick bosses to mount wet fogger nozzles like our ZEX LSX direct-port nitrous system (PN 82032, $1,329.95) which is adjustable from 75-300 hp. Nitrous is simply a tool that allows you to adjust how much and how quickly the engine burns the fuel. If the fuel isn’t there, the power won’t be either, so we’re using a set of 60-lb/hr FAST fuel injectors (PN 306008, $513.95) to ensure the flow is available.
| RPM |
TQ |
HP |
| 3,100 |
443.2 |
261.2 |
| 3,300 |
439.4 |
276.1 |
| 3,500 |
426.0 |
283.9 |
| 3,700 |
417.7 |
294.3 |
| 3,900 |
548.8 |
407.5 |
| 4,100 |
571.0 |
445.8 |
| 4,300 |
558.8 |
457.5 |
| 4,500 |
563.8 |
483.1 |
| 4,700 |
561.1 |
502.1 |
| 4,900 |
544.1 |
507.6 |
| 5,100 |
533.5 |
518.1 |
| 5,300 |
525.6 |
530.4 |
| 5,500 |
509.9 |
534.0 |
| Results: +117 hp, +114.7 lb-ft |
“…it would put most muscle cars with decent suspension in the 9s on sauce while still being a perfectly reliable stock engine that returned respectable fuel economy…”
Everything looked fine on the 75hp shot, so next we upped the “pill” to 125 hp. Things were working well on our high-mileage truck motor, so we stayed with the 91-octane fuel to simulate what the average street guy would be running. This size shot with pump gas would be an ideal combo for someone running this on the street every day. With the same 23 degrees of total timing and the same 10.8:1 air/fuel ratio, we were up over 200 hp from our baseline naturally aspirated run.
We want to run a wet-style...
We want to run a wet-style fogger nitrous system since it allows the most precise tuning for large power hits, but the problem with that on the stock truck intake is there is no way to properly mount the fogger nozzles. There isn’t enough room next to the injector and the plastic runners are only a little over 1/16-inch thick.
| 6.0L LS LQ4 |
| 125HP Nitrous |
| RPM |
TQ |
HP |
| 3,100 |
446.1 |
263.3 |
| 3,300 |
451.0 |
283.4 |
| 3,500 |
442.3 |
294.8 |
| 3,700 |
449.9 |
317.0 |
| 3,900 |
598.2 |
444.2 |
| 4,100 |
645.8 |
504.1 |
| 4,300 |
651.0 |
533.0 |
| 4,500 |
652.6 |
559.2 |
| 4,700 |
646.5 |
578.6 |
| 4,900 |
634.7 |
592.2 |
| 5,100 |
620.1 |
602.2 |
| 5,300 |
605.4 |
610.9 |
| 5,500 |
593.9 |
621.9 |
| Results: +204.9 hp, +203.5 lb-ft |
The ZEX LSX direct-port system uses a unique dual-stage jetting system; there is a set of jets in each of the distribution blocks and a second set of jets in each of the nitrous nozzles that allows the tuner to further trim nitrous and fuel for individual cylinders. The correct combination of jets is listed on the tune-up in the instruction manual. For our 175hp run, we stepped up to VP Racing’s VP100 and pushed the rpm just a little harder. The timing remained at 23 degrees total with the air/fuel ratio at 10.8:1.
Just as critical to making...
Just as critical to making power with nitrous is the targeting of the nozzle within the runner. We want the nozzle to extend fully into the runner to ensure the fogger can work as intended without puddling in the intake.
| 6.0L LS LQ4 175HP Nitrous, VP100 Fuel |
| RPM |
TQ |
HP |
| 3,100 |
444.1 |
262.1 |
| 3,300 |
448.7 |
281.9 |
| 3,500 |
452.4 |
301.5 |
| 3,700 |
465.4 |
327.9 |
| 3,900 |
640.7 |
475.8 |
| 4,100 |
707.4 |
552.2 |
| 4,300 |
703.2 |
575.7 |
| 4,500 |
707.4 |
606.1 |
| 4,700 |
696.5 |
623.3 |
| 4,900 |
691.0 |
644.7 |
| 5,100 |
674.4 |
654.9 |
| 5,300 |
658.9 |
664.9 |
| 5,500 |
639.5 |
669.7 |
| 5,700 |
624.4 |
677.7 |
| 5,800 |
620.1 |
684.8 |
| Results: +267.8hp, +258.3lb-ft |
“…the ZEX nitrous system over-delivered on the promised horsepower and torque on every test we ran.”
| Where The Money Went |
| Description: |
Source: |
PN: |
Cost: |
| Direct-port fogger nitrous system |
ZEX |
82032 |
$1,329.95 |
| Salvage yard LQ4 truck engine |
|
|
$900.00 |
| LSXR intake manifold |
FAST |
146302 |
$953.95 |
| Billet fuel rails |
FAST |
146032-KIT |
$190.95 |
| 60-lb/hr injectors (8) |
FAST |
306008 |
$513.95 |
| 92mm Big Mouth throttle body |
FAST |
54095 |
$476.95 |
| Total: |
|
|
$4,365.75 |