scotturnot
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Much better results John, everything really has me thinking. I really need to absorb all this info and see which way I should go.
Some things are comming to mind that suggest that you are PUMPING a bunch of the air and fuel out the exhaust.
The exhaust blowing off points to a BUNCH of energy release in the exhaust instead of flowing the burned A/F that has given much to the crankshaft.
Two 2.5" pipes have nearly 9 sq/in of INTERNAL pipe area. A single 3.0" has about 6.5 sq/in and many have made 700rwhp on a single 3" pipe. You are NOT out of exhaust capacity for your ENGINES current output but rather for the TOTAL energy capacity and exhaust system demands of the charge burning in the exhaust instead of in the cylinder where it can make power.
So, IMO you have WAY more power in the current combo.
Our compression tests produced some odd results. The left bank of cylinders consistently gave us 160psi of cranking compression, while the right bank produced 175psi. While a number of things could cause this, both Dennis & Mitch felt it was probably coming from an intake camshaft that was indexed or ground slightly off. This was borne out by comparing the actual injector duty cycles of both banks in order to achieve the same AFR’s.
John, Just left you a voice mail.
Some things are comming to mind that suggest that you are PUMPING a bunch of the air and fuel out the exhaust.
Your injectors should NOT be out of flow at 500hp and you as noted are adding additional fuel with the methanol.
The exhaust blowing off points to a BUNCH of energy release in the exhaust instead of flowing the burned A/F that has given much to the crankshaft.
Two 2.5" pipes have nearly 9 sq/in of INTERNAL pipe area. A single 3.0" has about 6.5 sq/in and many have made 700rwhp on a single 3" pipe. You are NOT out of exhaust capacity for your ENGINES current output but rather for the TOTAL energy capacity and exhaust system demands of the charge burning in the exhaust instead of in the cylinder where it can make power.
So, IMO you have WAY more power in the current combo. Almost worth putting a STOCK 1uzfe under than blower to baseline your FI combo.
John, I got your voice mail last night, and just read your comments and you do make a good argument for the cams being the reason for all that exhaust energy. If only that energy could have been pushing pistons instead of blowing off exhaust pipes, eh? Certainly a good reason to have adjustable cam gears, if only it were possible to adjust the intake timing separately from the exhaust......
Regarding the dyno sheet you posted. Is that the format from the Superflow? I really dislike dyno graduations that are not equal for torque and power. Your dip from 5300-5800rpm LOOKS like 300ft/lbs when in fact it is only 35lbs. I like to see the crossover at 5252 and the visual representation of torque vs power. I also like seeing the widest possible chart from the lowest to highest RPM available. Being a street engine I would like to see data from 2000rpm.