H/C LQ4 dyno numbers
07-11-2007, 09:02 AM
#1
H/C LQ4 dyno numbers
I know this is not a truck, but I thought some of you guys might like to read about the results of a stock bottom end LQ4. This is on my wife's bracket race car.
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 500rwtq 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.
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 500rwtq 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.
07-11-2007, 09:42 AM
#5
Opps, I guess that would help. 
Engine Mods:
Stock LQ4
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 w/Magnaflow race mufflers on the collectors
Ford Green Tops (40lbs/hr)
Custom Fuel system (A1000 pump, 60spi)
ASP U/D Pulley
Mezerie EWP
Mezerie Billet Flexplate
HPTuners 1-BAR SD EOS
Drivetrain Mods:
Kilgore RMVB TH400
B&M 5000 8" Stall
Wenco 3.5" Steel Driveshaft
KTRE 12-Bolt
Engine Mods:
Stock LQ4
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 w/Magnaflow race mufflers on the collectors
Ford Green Tops (40lbs/hr)
Custom Fuel system (A1000 pump, 60spi)
ASP U/D Pulley
Mezerie EWP
Mezerie Billet Flexplate
HPTuners 1-BAR SD EOS
Drivetrain Mods:
Kilgore RMVB TH400
B&M 5000 8" Stall
Wenco 3.5" Steel Driveshaft
KTRE 12-Bolt
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07-11-2007, 02:28 PM
#9
Originally Posted by KB
dang, wish us truck fellers could hit those kind of numbers with an H/C LQ4.
