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.

 

Damn thats pretty impresive!! nice work

 

Some good numbers for sure!

 

nice, . . . what other goodies are in it?

 

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

 

Damn! that is very impressive. Hell i'll be happy with those numbers from my 408.

 

what is you truck running and what are the numbers to for that ???? the 1500HD

 

dang, wish us truck fellers could hit those kind of numbers with an H/C LQ4.

 

Theres no reason why they shouldnt, a 12 bolt and a th400(old school 80e) are power robbers, only thing he has going for him is smaller tires. All the rest of the mods he listed we can have on our trucks with the exception of the 1 7/8 headers.

 

Here is the dyno graph and results:

Dyno Results


Dyno Sheet