LT5-displacement in demand? And injection set up making it to rest of the line up
11-18-2017, 02:14 PM
#1
Le Mans Master
Thread Starter
LT5-displacement in demand? And injection set up making it to rest of the line up
As the thread states - will the zr1 have dod?
Can anyone describe in detail but in not to technical of terms
How gm is combining direct injection with port injection ?
In addition to blowing fire out the *** end of the car a side
Benefit is less carbon build up on the valves.
Will this port/direct injection combo make it to the lt1, lt4 as well as
Other Engines in the gm car, suv and truck line up?
This port/direct injection set up may be well worth the wait if it makes it to the paltry 650 and 460 horse vettes.
I would think production costs would be less if gm ran this injection set up across the vette engine line up.
Can anyone describe in detail but in not to technical of terms
How gm is combining direct injection with port injection ?
In addition to blowing fire out the *** end of the car a side
Benefit is less carbon build up on the valves.
Will this port/direct injection combo make it to the lt1, lt4 as well as
Other Engines in the gm car, suv and truck line up?
This port/direct injection set up may be well worth the wait if it makes it to the paltry 650 and 460 horse vettes.
I would think production costs would be less if gm ran this injection set up across the vette engine line up.
11-18-2017, 05:00 PM
#2
Le Mans Master
Thread Starter
This snippet pulled from motor trend. Looks like the car will be very sophisticated in this area with 2 fuel injectors per cylinder a port and direct. Throw dod on top of that and it’s a very busy setup flames and all.
It will be interesting to see the fuel mileage estimate and how this set up works. Will the direct injection work all the time and will the port come on when it’s full throttle similar to the c4 zr1 secondaries or will they both work all the time simultaneously.
Snippet from MT:
“Another big difference: GM’s first dual fuel-injection system. It has primary direct injection and supplemental port injection. A cool by-product: It is said to shoot flames from the exhaust.”
It will be interesting to see the fuel mileage estimate and how this set up works. Will the direct injection work all the time and will the port come on when it’s full throttle similar to the c4 zr1 secondaries or will they both work all the time simultaneously.
Snippet from MT:
“Another big difference: GM’s first dual fuel-injection system. It has primary direct injection and supplemental port injection. A cool by-product: It is said to shoot flames from the exhaust.”
Last edited by Mr. Gizmo; 11-18-2017 at 05:02 PM.
11-18-2017, 05:32 PM
#4
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I expect Tadge may touch upon this in LA, but: the engine won't have AFM (there's the -100lbs!) and both cars will get hit with a GG tax. The final FE numbers have not been determined yet.
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elegant (11-24-2017)
11-18-2017, 05:56 PM
#5
Racer
11-18-2017, 06:24 PM
#7
Race Director
I have never understood why, after NOT avoiding the GG tax anyway, GM didn't just let the A8 Z06 run WITHOUT AFM unless you selected ECO mode (like a manual). Sure would have saved them a bunch of trouble on the torque converter front!
11-18-2017, 06:54 PM
#8
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"Ask Tadge" Producer
This isn't really ZR1-related, but: the GG tax would have been worse with AFM configured like it is on the manual. And some fun w/emissions due to that.
11-18-2017, 06:58 PM
#9
Race Director
^^^^
Got it, thanks.
Got it, thanks.
11-18-2017, 06:59 PM
#10
Race Director
So, JVP.
Given NO AFM on the ZR1, will they go to a carbon fiber (or some other lighter material) drive shaft?
Given NO AFM on the ZR1, will they go to a carbon fiber (or some other lighter material) drive shaft?
Last edited by jimmyb; 11-18-2017 at 07:00 PM.
11-18-2017, 07:06 PM
#11
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11-19-2017, 05:16 AM
#12
Le Mans Master
11-19-2017, 06:40 AM
#13
Melting Slicks
Higher redline if no AFM?
11-19-2017, 06:45 AM
#14
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11-20-2017, 11:26 AM
#15
Melting Slicks
As the thread states - will the zr1 have dod?
Can anyone describe in detail but in not to technical of terms
How gm is combining direct injection with port injection ?
In addition to blowing fire out the *** end of the car a side
Benefit is less carbon build up on the valves.
Will this port/direct injection combo make it to the lt1, lt4 as well as
Other Engines in the gm car, suv and truck line up?
This port/direct injection set up may be well worth the wait if it makes it to the paltry 650 and 460 horse vettes.
I would think production costs would be less if gm ran this injection set up across the vette engine line up.
Can anyone describe in detail but in not to technical of terms
How gm is combining direct injection with port injection ?
In addition to blowing fire out the *** end of the car a side
Benefit is less carbon build up on the valves.
Will this port/direct injection combo make it to the lt1, lt4 as well as
Other Engines in the gm car, suv and truck line up?
This port/direct injection set up may be well worth the wait if it makes it to the paltry 650 and 460 horse vettes.
I would think production costs would be less if gm ran this injection set up across the vette engine line up.
11-21-2017, 06:18 AM
#16
Le Mans Master
the big z06 di injectors and pump upped the ante but 755 likely would push that liimit a bit
the port injection allows adding more fuel and keeps the valves clean
It would have been cheaper to just build a bigger di so the engineers must have learned something from toyota and subaru who went this direction
the port injection seems to idle better for some reason, maybe better fuel atomization
rest assured there are some tecnical reasons and I'm for one happy they did. this may open some doors to back fitting this technology to the z06 for bolting on the blower and front end and
viola! you have a zr1 clone
there many things to like about the new zr1, I just hope the next iteration does the lt5 label proud and introduces dohc
with variable cam timing and dohc, we can resolve some of the current limitations and with the c8 room won't be as much of an issue
love the new zr1, but I have to admit I like my c4 LPE LT5 as well
619 HP with no blower that was in 97
FI with variable cam timing is a marriage made in heaven and gm knows it. the little ol redline lnf 2.0 made 260 hp, scale that up to 6.0 displacement with some decent heads the ecotech has pea shooters.
gm is likely going down this path to lower displacement and turbos, and fortunately they do it cheaper!
the port injection allows adding more fuel and keeps the valves clean
It would have been cheaper to just build a bigger di so the engineers must have learned something from toyota and subaru who went this direction
the port injection seems to idle better for some reason, maybe better fuel atomization
rest assured there are some tecnical reasons and I'm for one happy they did. this may open some doors to back fitting this technology to the z06 for bolting on the blower and front end and
viola! you have a zr1 clone
there many things to like about the new zr1, I just hope the next iteration does the lt5 label proud and introduces dohc
with variable cam timing and dohc, we can resolve some of the current limitations and with the c8 room won't be as much of an issue
love the new zr1, but I have to admit I like my c4 LPE LT5 as well
619 HP with no blower that was in 97
FI with variable cam timing is a marriage made in heaven and gm knows it. the little ol redline lnf 2.0 made 260 hp, scale that up to 6.0 displacement with some decent heads the ecotech has pea shooters.
gm is likely going down this path to lower displacement and turbos, and fortunately they do it cheaper!
11-21-2017, 11:09 AM
#17
Le Mans Master
A CF TT is standard on all Z06, so that’s nothing new for ZR1.
As far as the ZR1 shooting flames out of the exhaust — I’m having a hard time imagining how that would be. Port or Direct injection, all of it has to pass through the cats on it’s way out. One of a Cat’s primary missions is to be hot enough to burn through unburnt matter in the exhaust stream. It is really hard to imagine enough gas getting dumped down the exhaust that some of it could pass right through a 1000 deg cat and be ignited by exiting the tailpipe. Not saying it isn’t possible, just hard to imagine.
As far as the ZR1 shooting flames out of the exhaust — I’m having a hard time imagining how that would be. Port or Direct injection, all of it has to pass through the cats on it’s way out. One of a Cat’s primary missions is to be hot enough to burn through unburnt matter in the exhaust stream. It is really hard to imagine enough gas getting dumped down the exhaust that some of it could pass right through a 1000 deg cat and be ignited by exiting the tailpipe. Not saying it isn’t possible, just hard to imagine.
Last edited by Kent1999; 11-21-2017 at 01:52 PM.
11-24-2017, 02:51 AM
#18
A CF TT is standard on all Z06, so that’s nothing new for ZR1.
As far as the ZR1 shooting flames out of the exhaust — I’m having a hard time imagining how that would be. Port or Direct injection, all of it has to pass through the cats on it’s way out. One of a Cat’s primary missions is to be hot enough to burn through unburnt matter in the exhaust stream. It is really hard to imagine enough gas getting dumped down the exhaust that some of it could pass right through a 1000 deg cat and be ignited by exiting the tailpipe. Not saying it isn’t possible, just hard to imagine.
As far as the ZR1 shooting flames out of the exhaust — I’m having a hard time imagining how that would be. Port or Direct injection, all of it has to pass through the cats on it’s way out. One of a Cat’s primary missions is to be hot enough to burn through unburnt matter in the exhaust stream. It is really hard to imagine enough gas getting dumped down the exhaust that some of it could pass right through a 1000 deg cat and be ignited by exiting the tailpipe. Not saying it isn’t possible, just hard to imagine.
That is how I think it works.
Regards
Götz