H/C LQ4 dyno numbers

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Jul 11, 2007 | 09:07 AM

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TECH Junkie

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H/C LQ4 dyno numbers

Finally we had a chance to tune the Z28, with the stock bottom end LQ4 I put together and installed. First pass last week was a 465rwhp on a Dynapack. This week, after servicing the converter, we were at 471rwhp. I was aiming for 475-480 or so. I fixed the fuel and added some timing and came up with 494rwhp! ... can't recall the torque, but it was around 500 as well. I made some other changes, but it didn't like it. Talk about power, even through our 12-bolt (spooled 4.11) and RMVB TH400 using an 8", 5000 stall (from the HPTuners scans) ... oh and 91 octane fuel. Hopefully this means the Z28 will run mid-low 10s on this temporary engine. I will see about uploading a copy of the graph, it is unusual to say the least. Not bad for four quick sessions on the dyno with in an hour's time.

Jul 11, 2007 | 10:07 AM

crazyfokker

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What cam are you running?

Jul 11, 2007 | 10:40 AM

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TECH Junkie

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ported 241s (flow ~300cfm @ .600", 64cc)
Comp Ratio = ~10.7:1
Custom 240 cam with .600" lift on a 112 LSA
GMPP Single Plane Intake
Accel 4150 Throttle Body
Kooks 1-7/8 LTs
ASP U/D Pulley
Mezerie EWP
Mezerie Billet Flexplate
HPTuners 1-BAR SD EOS

Jul 11, 2007 | 10:46 AM

crazyfokker

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Im debating going 408 or finishing my 370. Your set up is probably a track only right?
how streetable is it?

Jul 11, 2007 | 11:25 AM

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TECH Junkie

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Yes, it is track only. As for the engine and possibly being street worthy, if the Accel TB had an IAC soleniod it would be very streetable in regards to idle quality. I can actually have it idle at 800rpms with the set screw and minor tweaking of the fuel/timing tables. The trans/converter setup is the only thing that is keeping it from being street worthy, but an overdrive with lockup trans should make it streetable.