air fuel ratio with boost
01-28-2015, 12:59 PM
#31
Registered
Can you read,,,I said this is what we saw.we tried a quick fix,it really didn't work.we sent the computes out to be reprogrammed.12.7 is a grenade waiting to happen.alot of 1075 owners don't have a clue what's happening in their combustion chambers,,hope they'll look and get a retune.
01-28-2015, 01:09 PM
#33
Registered
Can you read,,,I said this is what we saw.we tried a quick fix,it really didn't work.we sent the computes out to be reprogrammed.12.7 is a grenade waiting to happen.alot of 1075 owners don't have a clue what's happening in their combustion chambers,,hope they'll look and get a retune.
01-28-2015, 01:22 PM
#34
Registered
Don't bet
The 2 I've put widebands on would run in the 13 at cruise and only drop to 12.7/9.real scary,tried adjusting regulator for more fuel up top and it did nothing but richen the bottom a little.ended up having Marc boos add some fuel.
And the timing they run,wow.I'd never tune like that.
The 2 I've put widebands on would run in the 13 at cruise and only drop to 12.7/9.real scary,tried adjusting regulator for more fuel up top and it did nothing but richen the bottom a little.ended up having Marc boos add some fuel.
And the timing they run,wow.I'd never tune like that.
Seem pretty clear
01-28-2015, 01:26 PM
#35
Registered
Mercury runs the 1075 on the lean side. At WOT they get closer to 11.7/12.0afr ... cruise range is in the high 12s, low 13s .. Mercury, Whipple , Mark Boos are the only ones i know that have the software to make changes. the only thing you can do is crank up the fuel pressure from 60 to 62lbs to try and cheat the computer.. anything more the computer knows bc it monitors fuel pressure. Also the 1075 will go 150-175 hrs no problem, then just change springs,lifters, rockers and belts etc
01-28-2015, 05:30 PM
#37
Registered
Gold Member
01-28-2015, 06:54 PM
#39
Platinum Member
Platinum Member
Here is my thought. The Corvette is direct injected so they can control spark knock WAY better, but the intercooler has a finite supply of cool water, so to compensate, just flood the engine.
The 1075 on the other hand has an unlimited supply of cool water for the intercooler, so they can run it leaner and with more timing.
And another thing is how good would it look for GM to say you have to have the engine in your $120,000 car rebuilt every 6-12 months, vs Mercruiser, say Oh you just bought 2 of our $80,000 engines, the maintenance schedule on those engines is a rebuild every 150 hours, but that is OK because we know you can afford it, and that is the accepted norm for your type of boating.
The 1075 on the other hand has an unlimited supply of cool water for the intercooler, so they can run it leaner and with more timing.
And another thing is how good would it look for GM to say you have to have the engine in your $120,000 car rebuilt every 6-12 months, vs Mercruiser, say Oh you just bought 2 of our $80,000 engines, the maintenance schedule on those engines is a rebuild every 150 hours, but that is OK because we know you can afford it, and that is the accepted norm for your type of boating.
01-28-2015, 07:39 PM
#40
Registered
Here is my thought. The Corvette is direct injected so they can control spark knock WAY better, but the intercooler has a finite supply of cool water, so to compensate, just flood the engine.
The 1075 on the other hand has an unlimited supply of cool water for the intercooler, so they can run it leaner and with more timing.
And another thing is how good would it look for GM to say you have to have the engine in your $120,000 car rebuilt every 6-12 months, vs Mercruiser, say Oh you just bought 2 of our $80,000 engines, the maintenance schedule on those engines is a rebuild every 150 hours, but that is OK because we know you can afford it, and that is the accepted norm for your type of boating.
The 1075 on the other hand has an unlimited supply of cool water for the intercooler, so they can run it leaner and with more timing.
And another thing is how good would it look for GM to say you have to have the engine in your $120,000 car rebuilt every 6-12 months, vs Mercruiser, say Oh you just bought 2 of our $80,000 engines, the maintenance schedule on those engines is a rebuild every 150 hours, but that is OK because we know you can afford it, and that is the accepted norm for your type of boating.
