Out with the old maggie in with the new maggie
Mar 25, 2010 | 04:36 PM
#12
looks good! that is better then diesel. they need a ton more boost to make that kind of power. which pac springs are you running. reason i asked is i picked up a set of dyno time only 1518's which were off of l92 heads that the person had problems keeping valves closed at high rpm... seat pressure and big heavy valves was the problem.
Mar 25, 2010 | 09:16 PM
#13
Thread Starter
On The Tree
Joined: Jul 2006
Posts: 134
Likes: 0
From: Colorado
Engine builder made a few more pulls today and with a little tweaking got quite a bit more power out of the motor. Final numbers were 782 hp and 774 ft/lbs of torque. Made 735 ft/lbs at 2500 rpm and averaged over 730. Engine is going back into my 03 Denali so the super built 4L65 wont take that much power. Only choice is to run a bigger pulley but will probably slip less anyway. I will try to post graphs this weekend. The pac springs were their top of the line beehive but I can't remember if those are the 1218's. I will try and check tomorrow with the engine builder. Hopefully have it back in the truck this weekend.
Last edited by fish5225; Mar 27, 2010 at 03:36 PM.
Mar 26, 2010 | 04:22 PM
#19
Engine builder made a few more pulls today and with a little tweaking got quite a bit more power out of the motor. Final numbers were 785 hp and 795 ft/lbs of torque. Made 735 ft/lbs at 2500 rpm and averaged over 750. Engine is going back into my 03 Denali so the super built 4L65 wont take that much power. Only choice is to run a bigger pulley but will probably slip less anyway. I will try to post graphs this weekend. The pac springs were their top of the line beehive but I can't remember if those are the 1218's. I will try and check tomorrow with the engine builder. Hopefully have it back in the truck this weekend.
Mar 27, 2010 | 05:32 AM
#20
Finally got everything together and started tuning on the engine dyno. First thing that is obvious with the 2300 over the 1900 is that a 6 rib belt system has zero chance of working without slip. I see know why the new ZR1 corvette went with an 11 rib belt. If you are trying to make anything over 8 lbs of boost a 8 rib setup is a must. We started with a 2.8 pulley (between 7-7.5 lbs) but went to the 3.0 pulley where we actually made 8.5 lbs of boost from 5500-6500 rpm. We actually ended up with more boost on the high end with the larger pulley.
The good news is the blower is a monster. With 7-7.5 lbs of boost we averaged 728 ft lbs from 2500-6100 rpm. Remind you this is on a very streetable cam, 222-236, 601-603 at 115 LSA.
It is apparrent that the 2300 and the L92 heads need substantially more cam duration if you want to make huge power. We probably could have gone to a 238-255, 650-650, with the right pulley and rib set up but we actually reduced duration from our last motor to make the truck a little more drivable.
So far with this torque pulley we have hit 753 hp at 6400 rpm. This is on a very basic tune and we are hopeful to push this number over 800+ even with the belt slip limitation and the small cam.
Just like the 1st motor, the torque curve on these blowers are unbelievable. If you want power under the curve, or in this case power under the flat plate, the maggie is the answer. Diesels don't have crap on this motor, 705.7 ft/lbs at 2500 rpms says it all. Better start saving for another tranny build.
...
The good news is the blower is a monster. With 7-7.5 lbs of boost we averaged 728 ft lbs from 2500-6100 rpm. Remind you this is on a very streetable cam, 222-236, 601-603 at 115 LSA.
It is apparrent that the 2300 and the L92 heads need substantially more cam duration if you want to make huge power. We probably could have gone to a 238-255, 650-650, with the right pulley and rib set up but we actually reduced duration from our last motor to make the truck a little more drivable.
So far with this torque pulley we have hit 753 hp at 6400 rpm. This is on a very basic tune and we are hopeful to push this number over 800+ even with the belt slip limitation and the small cam.
Just like the 1st motor, the torque curve on these blowers are unbelievable. If you want power under the curve, or in this case power under the flat plate, the maggie is the answer. Diesels don't have crap on this motor, 705.7 ft/lbs at 2500 rpms says it all. Better start saving for another tranny build.
...
Engine builder made a few more pulls today and with a little tweaking got quite a bit more power out of the motor. Final numbers were 785 hp and 795 ft/lbs of torque. Made 735 ft/lbs at 2500 rpm and averaged over 750. Engine is going back into my 03 Denali so the super built 4L65 wont take that much power. Only choice is to run a bigger pulley but will probably slip less anyway. ...
I couldn't imagine. I'd love to see what it'd do in the 1/4. 