Dynamometer Results & Comparisons - Stock LQ4 with 88mm & 12psi (571whp/527wtq)

Specs on engine:

- Complete drop out -- 2001 LQ4 with 32,xxx miles.
- Long block is completely stock except:
-stock rings regapped to .030"
-80lb Siemens Deka Injectors EV1
-ARP2000 rod bolts
-ARP Pro head studs
-LS9 head gaskets
-ls6 yellow springs

-PTE PT4788 @ 12 psi & 17* timing.



Loose Bradco flashed 4500rpm -- Turbo 400 & 9" with spool and 35 spine


Does this seem about right output to you guys?

sorry, forgot to mention it was a Dynojet Dyno. And AFR was 10.5 to 11.0.

Looks like some good numbers with your drivetrain. Any plans to turn up the boost at all?
Im sure a few more #`s of boost will get you some pretty big gains with that turbo

Looks like some good numbers with your drivetrain. Any plans to turn up the boost at all?
Im sure a few more #`s of boost will get you some pretty big gains with that turbo

I would like to make this block last for this season (no windows) and then next year it will have a stroker 408 all forged bottom end & CNC L92 heads with custom cam in the 6xx lift and 23x duration. I may go a few psi, but only shooting for 10.50's or so this year.

I wasn't really sure what to except so I wanted to see if this seemed about right for this setup to everyone on here.

I would think it would push a little more with that size turbo. But that drivetrain is going to rob a lot, and sounds like a fairly safe tune so I'm sure your right where you should be.

Sounds strong to me through an unlocked converter

What gear ratio are you running in that 35 splined 9"? Just curious.

What gear ratio are you running in that 35 splined 9"? Just curious.

3.70 ring and pinion.

still on the stock lifters and timing chain set as well??
What fuel system are you running? (Walbro 255lph Pump, Twin pumps, Boost a pump, etc..)

Whats your race weight??

still on the stock lifters and timing chain set as well??
What fuel system are you running? (Walbro 255lph Pump, Twin pumps, Boost a pump, etc..)

Whats your race weight??

Yep, engine totally stock except for what's mentioned above. I wanted to do a real stock LQ4 boosted test.

Aeromotive Eliminator pump 8an feed and 6an return. 80 lb injectors aero motive boost ref FPR.

Guessing 3800 with me and fueled up

Sounds good. Hope to see some good track results!! Ill bet you could add another 2lbs of boost run it all season and still not hurt it!

I'm working on a Gbody build myself this year with a 82' Regal Stock Bottom LQ9, Trickflow 220 heads, and cam N/A Build car weighs 2980lb with no driver. Hoping to see mid to low 10's

Not bad at all. Will make some really impressive numbers when the motors built fir more boost.

Nice numbers I plan to make 1000whp with my forged 370 and pt4788

Just realized I was at 110mph @ 6000 rpm with 3.70 gear & 88" circumference tires on all my dyno pulls (high gear). That comes out to something near 19% slippage. prolly should have it tightened up a bit. That's gotta be causing some power loss.

How did it look up top? Was it holding boost steady? I would think those yellow springs might be an issue.

I would think a little more power out of that Turbo compression combination but you may be pulling a lot of timing out.

For comparison my setup with an 8.9:1 CR pulled 600RWHP through a TH400 and 12 bolt at 10PSI. I know I'm blowing through the converter at around 23.5PSI and above but I don't know my slip at 10PSI.

well I maybe pushing my luck with my set up, but I want to see will it live! Got a new engine sitting on the stand. Got a completely stock LQ4, with 100xxx + miles, only thing I changed was the oil pan, oil pump, 60lb inject, LS6 cam&springs. 16 passes at 15lb boost, but timing is low 7.5-8.0. Getting HP to tune with, so I can turn up the timing. Also have a snow meth kit. Heads, and intake never been off.

How did it look up top? Was it holding boost steady? I would think those yellow springs might be an issue.

Yes boost was very steady once it was spooled up is was right at 12.0.

Gear and converter are killing your #'s and will affect track times.

I would switch to a 3.20-3.40 gear and tighten the hell out of the converter.

Gear and converter are killing your #'s and will affect track times.

I would switch to a 3.20-3.40 gear and tighten the hell out of the converter.

I'm hoping the converter will be alittle tighter once there is a real load on it, the brake was not working on the dyno so we couldn't load the turbo. The entire pull from WOT @ 35mph to 6000rpm rev limiter was only 2.4 secs. I will know more after a few passes i suppose. I'm sure it will need to be tightened up for next yr's setup for sure.

The 3.70 should be ok, we only run 1/8 mile here (sucks :().

wow this is giving me some hope. i have a stock lq4 with a gt4202 backed by a glide in my notch. spring in the gate is 12lbs iirc and i have her on e85. id be happy with 550 for now but youve given me hope lol. get her to the track and see how she does!

I'm hoping the converter will be alittle tighter once there is a real load on it, the brake was not working on the dyno so we couldn't load the turbo. The entire pull from WOT @ 35mph to 6000rpm rev limiter was only 2.4 secs. I will know more after a few passes i suppose. I'm sure it will need to be tightened up for next yr's setup for sure.

The 3.70 should be ok, we only run 1/8 mile here (sucks :().

For a comparo we had a 383 with the same turbo,gear and loose converter dyno at 15lbs. Made 680hp or so. Put in a tighter converter, 3.42 gears and the same tune/boost made 830rwhp.

Made a couple of shakedown runs on crappy Test-n-tune night.

60' 1.460
660' 6.67
mph 104.34
1/4 10.61 @ 122.95 (6000 rev limiter was on at 8-900ft, out of gear)

Launched at 6psi
1.0sec out 9psi
3.0sec out more 14psi (bringing boost on any sooner the car getting loose)


I was happy with how it did on the first few passes. I have some things to fix. I know on a good track I should be able to get a 1.39 60' and bring the power on out of the hole instead of 4 secs out.

Well the car ran low tens all yr at 132 to 133mph. I did turn it up one time before winter and hurt something as it has a small clicking sound now. It unloaded the tires 3 times that pass, which may have lead to the oops, but it did run 136.5 so I'm pretty sure it would have run 9.8's or even 9.7's with my normal 1.37 60'. Owell, the stock LQ4 did its job all year, time to make way for the Alky 403 Lsx. Hoping for 1200whp, we'll see in a few months.