Well, the LT5 is now confirmed a thing....
Got an email from GM last night about the new ZR1 Corvette and it's new 755 hp LT5 engine...maybe there's hope for a Z/28 someday....
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My personal opinion is that if they make a Z/28, I hope it has a high reving N/A engine in it, not the LT5. Hell, throw a slightly reworked LS7 in it and give it the ZL1LE wheels, aero, and a little diet. (It’ll never happen but I would be ok with that.)
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Al O already said the Z/28 is an n/a car. If, and that is a massive if, there will ever be another Z/28, it won't have the LT5.
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Well then sadly I don't think this fabled Z/28 is ever going to happen. GM will never get a NA engine past current and beyond emissions standards that makes enough steam to not be considered "slow" compared to the current crop of forced induction power plants. Sorry, NA is great...but forced induction is the road ahead. If NA truly is the only way forward for the Z/28, I think it died in 2015.
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The emissions question really is a matter of startup emissions. And the big-displacement engines can't hack it on cold startup. Smaller displacement engines can....but you lose the power figure...so, the solution there is individual cam-phasing, and higher revs to make up the gap in power...but you're going to end up with a lower-torque engine, like the Voodoo V8 in the GT350, or any number of European engines. |
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Z/28 will fallow the last gen, with more power and a new DCT TRANS, power will come from a N.A. motor. |
I still think the Z28 name is too important to just leave on the sidelines. Perhaps we get a preview of the NA motor from the C8 Corvette. I still think we see something when the car is refreshed. They have boxed themselves into a pretty good corner though. The SS 1LE is pretty close to what you might expect a Z28 to be. The ZL1 1LE is so extreme that it sets a high bar if the Z/28 has to out perform it. I don't believe it will get the LT5 though. I doubt the ZL1 gets the LT5 either. I think that one is Corvette only.
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First is putting the LT5 in the ZL1 1LE chassis. Doing this and maybe adding a couple of other goodies like standard CC brakes and such, would make it the top dog in the line up. The second option is to put the LT1 in the ZL1 1LE chassis. Having the DSSV, the A10 available, and the body panels, would be enough to distinguish from the SS 1LE. This would also keep Big Al from being a liar and the Z/28 remain N/A. Interesting note about the LT5 is that it has combines direct injection with port injection. In this case, for the purpose of adding the fuel needed to run 13lb boost to keep the engine fed, but it will also help keep valve coking in check. Also have not read anything yet that the LT5 has AFM. |
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One of the common observations of the Z/28 was how it feels like it runs out of steam at the high end. Essentially the suspension and brakes outperform the engine. I would think the hypothetical thing we're discussing would suffer from the same sort of characteristic... |
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After the SEMA show I had read that the Chevrolet Performance team is looking into possibly making a conversion kit to put the ZL1 1LE front end (bumper, fenders, hood) onto SS Camaro's. The DSSV suspension is already announced that it will be coming and as far as brakes go if I were to upgrade brakes on a 6th gen 1LE I'd just skip the OEM stuff and go right to Essex/AP Racing. It will save weight over OEM stuff and outperform it. |
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I will also say this. I think we are more likely to get a LT5 Z28 than we are to get no Z28 at all. N/A ZL11LE would be pretty cool though. I still think it would need a power bump over the LT1 though. |
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LT5 is heavier though. What I would really like is an N/A engine with the the SS 1LE styling+chassis and ZL1 interior.
Say based on the LT1 but with more top end or shorter gearing, and lighter engine internals like the LT4 has. That would probably be the "new" LS7, or at least the uplevel N/A engine. |
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btw. I too am not a fan of the 1.7L SC on the LT4. Big mistake that Camaro had to adopt but overall Camaro wins from GM's larger performance envelope. |
Does the ZL1 1LE have wider fenders than a SS if so how much wider are they? Sorry for the newbie question
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Al said several years ago the Z28 will be built with a normal aspirated engine. He stated you will never see forced induction in the Z28 so the new LT5 will not be in the Z28. The history of the Z28 has always been to compete in Trans Am racing. Most people don't know if you order the SS it's RPO was Z27. What I found amusing GM put the Z24 sticker on the Cavalier, RPO code for Z24 is the SS427.
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The ZR1 is what the Z06 should have been. The Z06 we have new is too compromised. I may have been wrong about them going beyond the LT1 and LT4 but I still don’t seem them suddenly releasing a bunch of new engines. |
I read an article about the ZR1 in Car and Driver, and a lot of Tadge quotes seem to indicate that one of the biggest enablers of this car was ignoring EU pedestrian standards, and choosing not to sell the car there.
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My belief is that a ZL1 will have the LT5 engine upgrade during this generation and the Z/28 will also be produced before the next gen arrives but it will not have a power adder. We will see an entirely new power plant come our way in 2019 for the final 2 year send off of the 6th gen Camaro.
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At this point it is going to come down to what the Camaro needs to compete in the market place, honestly though it isn't just about horsepower ratings anymore.
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I think the Z/28 should use a lower displacement, moderate rpm V8. 323CI truck engine with 6700rpm redline? Strip an SS 1LE and give it something similar to Corvette competition seats, make the PDR standard and back seats, electronics, and A/C optional. Standard DSSV with 285/315 Supercar 3R tires, optional carbon ceramics, and a bit more downforce. It would also need a flowtie, A black bow tie, black taillights and brake light, and 323 badges on the sides. 3500lbs with 450hp and a 6-Speed. It wouldn’t be the fastest in a straight line nor around a track, but Chevy could easily sell that for $55,000 and make money. That 5.3 liter would pull all day long and the suspension and tires would make it the most agile Camaro to date, and I bet you it would be the most fun Camaro to toss around a track. That’s what the Z/28 should be: a fun, inexpensive, reliable, yet high performing track car. It would also fill in the $50,000-$60,000 range for the Camaro lineup and make Ford wish their GT350, boss, Mach 1, or whatever else they have was that good.
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If the Camaro gets its own engine or works it out where they will share an engine with the ATS V replacement (I can see that happening) then they should aim to set a new high water mark for production OHV engines. Go for at least 7,500rpms (maybe higher), they can use a 5.3L V-8 but honestly I like the idea of a 4 inch bore and 3 inch stroke 5.0L V-8. With the bore of the 6.2L engine they can put some heads on it the approaches 400CFM of flow on the intake side of things. Look at the Coyote engine, even ported heads are pushing around 340CFM of flow while stock is pushing 298CFM of flow (I believe first gen heads). Stock LS3 heads will flow 314CFM and would fit on said 5.0L engine meaning you have a 5.0 2 valve head with more flow then Fords 4 valve 5.0L head. I have seen on the net ported LS3 heads and after market casting pushing close to 400CFM. Put that on a 5.0L LT motor combined with some rpm and you would make huge power.
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I still want to see a low rpm, low displacement small block Camaro. Maybe that could work as a less expensive SS engine(Think R/T vs SRT 392). 375hp 390lb-ft or torque, six speed manual. If they drop a few standard features like they said they would, a $33,000 V8 Camaro would be possible with that engine. That’s old school fun, and I think it would work. Either way, we’ll have to wait ‘till summer to see if they’re testing a new Z/28. Until then, there’s no point to all of this talk anyways. |
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The ZL1-1LE makes it damn near impossible to have an NA Z/28, the engine would have to go super-exotic to make the kind of power that would eclipse the 1LE and it's so damn fast and track-tuned already that I seriously doubt a lower HP NA engine around the 500-550hp level is going to have a chance in hell of beating it. Maybe if they did a flat-crank V12 like ferarri and was able to get 700 NA HP, but that ain't going to happen, no way they'd invest in those kind of materials and that kind of development. The only way I see this going down is with the LT5, with the only possible ace being a smaller displacement hot-V twin turbo, but again, I'd doubt they'd invest that much into it (but then, what goes in the mid-engined Corvette Z06/ZR1?). I think they'd have to push NA development to levels they just won't go to for the Z/28 to be NA.
Maybe I'll be wrong, but for them to eclipse the current ZL1-1LE by any significant amount would take something that will surpass so many hypercars that I just don't see it. |
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