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Old 03-26-2016, 06:00 PM   #1
captainjpc
 
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Z28 Engine LT4, LS7 or new naturally aspirated LTx?

What do you guys think or has anyone heard anything? LT4 LS7 or something new?
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Old 03-26-2016, 06:15 PM   #2
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I've been battling with this over at The House of Z.

I think the LS7, regardless of how much I love that engine, is gone now. I gphad thought that GM would simply make a ZL1, light weighted, CC brakes and call it the Z/28. I'm more along the lines that GM will bump the LT1 to 500 similar to taking the LF3 and making the LF4 just for the ATS-V.

So either a light weight ZL1 or a 500 HP 1LE, and I'm leaning toward the latter right now. Mostly because I'm hoping the next Z/28 isn't a $75,000 car.
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Old 03-26-2016, 06:19 PM   #3
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Well I think the prob is the carbon ceramics they should be optinal not standard, those breaks drive the price up alot!
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Old 03-26-2016, 06:31 PM   #4
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Z28 Engine LT4, LS7 or new naturally aspirated LTx?

I'm really leaning more toward them going with a regular LT1 and just getting a little more extreme with weight savings, suspension, aero, tires, and brakes. I said it once in another thread, but think more 1LE-R.

Don't get me wrong, I'm crossing my fingers for a 500+hp NA motor for sure. I really wish they'd build a 7.0 LT7 with DI and VVT. I know I'm not the only one who has said that exact thing. With DI, VVT, and 12:1 or higher compression, there's no way they couldn't squeeze out 530+ while still meeting emissions. Not only that, but the people interested in modifying the engine would have a wealth of untapped potential with very little work. Katech's 7.0 LT1 package makes over 700hp with 12.5:1 compression and a mild head and cam setup on 93 octane.

Last edited by Nataphen; 03-26-2016 at 06:42 PM.
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Old 03-26-2016, 06:46 PM   #5
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hmmm....
Whatever they do, those who are lucky enough to go to the next track event where folks think they are going to have fun playing around with say...a 1LE be ready for the, "oh and BTW, here's the brand new Z/28".

I can't imagine what they are doing...I mean from the looks of it the ZL1 won't have any issues around the track with the FI motor, and from the videos we've seen, it hauls serious @$$ in the turns and straights so whatever they do for the Z/28 I suspect it will blow our freaking minds.

Honestly, a LT4 with all the cooling they are doing, with say, full carbon fiber front end to reduce weight up front, take the back seats out and all the goodies, CC brakes, CF wheels, aero package, done!... of course if that is the case, Number3 ain't gonna get his unde $75K car.

With the way the ZL1 reveal event went down with the freaking C-Suits out there doing hot laps with media, I have little doubt that they will bring something huge.
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Old 03-26-2016, 06:58 PM   #6
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I'm guessing an n/a LTx 6.2 north of 500 hp and close to 500 tq, CNC heads, no AMF for a hotter cam, new intake manifold and CAI.
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Old 03-26-2016, 07:02 PM   #7
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I'm guessing an n/a LTx 6.2 north of 500 hp. CNC heads, no AMF for a hotter cam, new intake manifold and CAI.


Nice thinking. AFM isn't available on manual transmission cars anyway, so that would be an easy upgrade for the Z/28. The stock LT1 cam is so mild that you could add a lot of power without even making the idle rougher.
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Old 03-26-2016, 09:00 PM   #8
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Kinda hoping they make a modern LS7 like a LT7 or something!
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Old 03-26-2016, 09:00 PM   #9
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Nice thinking. AFM isn't available on manual transmission cars anyway, so that would be an easy upgrade for the Z/28. The stock LT1 cam is so mild that you could add a lot of power without even making the idle rougher.
Yea but the AFM lifters are still there. Those need to come out.

Im really hoping for a new motor. Theres already an LT1 car and an LT4 car. the only thing they can do with the LT1 is extreme weight loss otherwise its just another 1LE. And if its an LT4 people are going to be mad that they went forced induction for a track car, much like they were with the Z06.

Id love another big displacement LS7-ish engine. We'll see i guess.
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Old 03-26-2016, 09:03 PM   #10
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I'm thinking it will have a new LT*. Maybe it's me but I don't see a reason to come out with a Z28 with the stock LT1. The 1LE is going to be pretty quick around the track already. I'm sure they can bring more aggressive aero packages to the Z28 but I just don't see it with the LT1.
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Old 03-26-2016, 09:29 PM   #11
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I also believe a new LT variant engine will be in the Z with over 500hp. Will it have similar bore stroke ratio they'be been using or will the reduce the stroke to make a higher reconvene track engine. There was a destroked LS7 that was making over 600hp for a pure track car I just read about recently. Maybe GM will be looking into doing something a little different this time.
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Old 03-26-2016, 09:49 PM   #12
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Quote:
Originally Posted by toehead93 View Post
I also believe a new LT variant engine will be in the Z with over 500hp. Will it have similar bore stroke ratio they'be been using or will the reduce the stroke to make a higher reconvene track engine. There was a destroked LS7 that was making over 600hp for a pure track car I just read about recently. Maybe GM will be looking into doing something a little different this time.
Based on some quick math, an engine using the 3.622 stroke of the LT1 could rev 7500+ rpm and still have the same piston speed as the LS7. Using the shorter ratio rocker arms, I wonder if they would be stable at those rpms.

I think the issue would be valve area and port flow to get enough air in the engine.
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Old 03-26-2016, 10:57 PM   #13
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Quote:
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I'm guessing an n/a LTx 6.2 north of 500 hp and close to 500 tq, CNC heads, no AMF for a hotter cam, new intake manifold and CAI.
I agree, I feel like they have had to have been working on some additions to the LTx family. even if it's just an LT1 with heads and cam, like the LT4 in '96, or the LS6 in '01. I know they have had to have been hearing the feedback from Corvette folks that were wanting an N/A Z06. They have to know that there is a great number of people that F.I. is just not wanted. I can see GM making the Z/28 just that car, the precedent is already set. Unfortunately, I think they will also make it a $75K car though.
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Old 03-26-2016, 11:00 PM   #14
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Ive been thinking for a long time - LT5 or LT7 I can see.
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