Budget LQ4 with 243 Heads...NOW WITH DYNO RESULTS!
06-26-2012, 03:42 PM
#41
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Got dyno'd today over at CalSpeed.
First run was 415 RWHP/357 lb-ft
After a few adjustments to the tune it did 425/361, but the injectors were at 100% duty cycle.
We then swapped in a set of 36 lb SVO injectors, tuned, and did 428 RWHP but torque jumped to 383 lb-ft.
Last mod was an 85 MM truck MAF, and after a hiccup run, he adjusted for the MAF calibration, and the final pull of the day was this:
439 RWHP @ 6100 RPM, and 372 lb-ft TQ @ 4900 RPM.
I'll post the dyno sheet when he emails it to me.
BTW- This was made on a Dynocom eddy current dyno that is known to be within 5-10 RWHP or so of local DynoJets.
Just goes to show that a dialed-in combo and a dead-nuts tune can yield big numbers, even with a cam that most people laugh at.
Here's the final mod list with prices:
Used 6.0 LQ4 from LKQ with 83,000 miles: $1000
Used 243 heads off an LS4 motor: On hand
Mill, valve job, new seals on the heads: $320
Used low mile GM Hot Cam: $180
Head/Cam gasket and bolt said from TR: $190
Brand new Hooker LT headers from PP with gaskets and O2 exts: $420
Used X-pipe: $100
Walker Dynomax bullet mufflers: On hand
Used 8k mile 36 lb SVO injectors: $100
New "take out" LS6 oil pump: $80
New LS2 timing set: $72
Used 4k mile Crane 850-16 lifters: $60
Lightly used 85 MM truck MAF: $80
New NGK TR6 Plugs: $16
M1 oil and filter: $32
Labor for exhaust: $110
Total out of pocket cost: $2760
And I traded the 165,000 mile LS1 longblock to the shop that did the work for the labor to pull the old motor and assemble and install the LQ4.
First run was 415 RWHP/357 lb-ft
After a few adjustments to the tune it did 425/361, but the injectors were at 100% duty cycle.
We then swapped in a set of 36 lb SVO injectors, tuned, and did 428 RWHP but torque jumped to 383 lb-ft.
Last mod was an 85 MM truck MAF, and after a hiccup run, he adjusted for the MAF calibration, and the final pull of the day was this:
439 RWHP @ 6100 RPM, and 372 lb-ft TQ @ 4900 RPM.
I'll post the dyno sheet when he emails it to me.
BTW- This was made on a Dynocom eddy current dyno that is known to be within 5-10 RWHP or so of local DynoJets.
Just goes to show that a dialed-in combo and a dead-nuts tune can yield big numbers, even with a cam that most people laugh at.
Here's the final mod list with prices:
Used 6.0 LQ4 from LKQ with 83,000 miles: $1000
Used 243 heads off an LS4 motor: On hand
Mill, valve job, new seals on the heads: $320
Used low mile GM Hot Cam: $180
Head/Cam gasket and bolt said from TR: $190
Brand new Hooker LT headers from PP with gaskets and O2 exts: $420
Used X-pipe: $100
Walker Dynomax bullet mufflers: On hand
Used 8k mile 36 lb SVO injectors: $100
New "take out" LS6 oil pump: $80
New LS2 timing set: $72
Used 4k mile Crane 850-16 lifters: $60
Lightly used 85 MM truck MAF: $80
New NGK TR6 Plugs: $16
M1 oil and filter: $32
Labor for exhaust: $110
Total out of pocket cost: $2760
And I traded the 165,000 mile LS1 longblock to the shop that did the work for the labor to pull the old motor and assemble and install the LQ4.
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Homer_Simpson (07-24-2023)
06-26-2012, 04:08 PM
#42
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That is way cool man. Good job on getting it done on less than $3k. And an additional thought about your cam, people forget that the GM engineers that designed the heads spec'd that can to work with that motor. It will make good power and be driveable to boot.
06-26-2012, 04:15 PM
#43
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Drivability is good, though it can use more tuning with the A/C on, as it tries to die. I do have to say that the tune is EVERYTHING as far as maximizing the performance. The difference was night and day after the tune, even though on paper it was only 24 HP on paper.
06-26-2012, 04:54 PM
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Well, I was expecting around 390-400 RWHP, and was looking at getting some LS3/L92 heads in the future, but with these numbers, I might just go for a bigger cam in a year or two and spray the **** out of it.
06-26-2012, 06:25 PM
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good #s.just goes to show that most people over cam their engines,at least in a street application..i've always said,and most people laugh,that you don't need big cams to make big power..
06-26-2012, 06:33 PM
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I also gotta give a shout-out to Jim @ CalSpeed, who is an absolute wizard with HPTuners.
06-26-2012, 07:46 PM
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That's going to be a hoot to drive on the street. Looking forward to the dyno sheet to see the low end torque. Buy some stock in Goodyear/BFG/Bridgestone etc... to offset what you're going to put into rear rubber.
07-19-2012, 09:51 AM
#56
question, how much power would this setup make with a LS2 intake and a custom cam...Asking because I have someone that is selling his 243 heads/ls2 intake w/throttle body for cheap and I was wanting to pick those parts up since they were a good price. Dont plan on spinning the motor past 6500 and looking for more under that.
07-25-2012, 12:05 AM
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question, how much power would this setup make with a LS2 intake and a custom cam...Asking because I have someone that is selling his 243 heads/ls2 intake w/throttle body for cheap and I was wanting to pick those parts up since they were a good price. Dont plan on spinning the motor past 6500 and looking for more under that.
As for a custom cam, that's something to take up with a Patrick G or someone knowledgeable on the various grinds.
I shift mine at 6400 and that's about as much as I want to spin it.
BTW- I had the same shop install my spray, and I made 528 RWHP on a 75-shot before I ran out of fuel pump! This setup definitely likes nitrous!