Katech LT2?
Popular Reply
Oct 22, 2019, 10:02 AM
Premium Supporting Vendor
Joined: Oct 2005
Posts: 13,975
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From: Clinton Township MI
C7 of Year Finalist (track prepared) 2019
Premium Supporting Vendor
Joined: Oct 2005
Posts: 13,975
Likes: 980
From: Clinton Township MI
C7 of Year Finalist (track prepared) 2019
I think building the engine will be the easy part. Once tuning is unlocked we can do it.
Melting Slicks
Joined: Jun 2012
Posts: 2,226
Likes: 1,029
From: Thomas Texas
Mechanically, the difference between the LT1 and LT2 isn't really very much. Stock cam is slightly different and the intake manifold. There are the additional oil scavenging pumps they have to deal with. But to bump displacement up to 7.0 would seem pretty much the same as a LT1. I would love to see the result of a build where the peak power is in the 7,500 rpm range!
Until their team gets their hands on the ECU and figure out what's different, its anybody's guess when or if it can be done soon after release of the C8.
But can you imagine what the car would do with 100+ more HP? Yikes!
Drifting
Joined: Mar 2006
Posts: 1,869
Likes: 23
From: Oro Valley Arizona
I have always been a fan of larger, normally aspirated engines. The LS7 prompted me to buy my first Corvette and I still daily drive my ‘07 Z06. Anthony, please use whatever lobbying power Katech has for GM to produce a LS2 based 427 the way they did for the LS7. Maybe a LS8? Ok, how about a large bore, shorter stroke DOHC 400 with titanium rods, valves and a 7500 red line? I would love to see a lightweight C8 Z06 built with the same philosophy as the C6 Z06. Give me high torque AND light weight.
Stealthtitanium
PS if you extrapolate a LS2 out to 427 cubic inches, you get a smooth, efficient, emissions-legal 560 horsepower and 553 foot pounds of torque without the weight and cost of a supercharger. Don’t flame me. Just dreaming.
Stealthtitanium
PS if you extrapolate a LS2 out to 427 cubic inches, you get a smooth, efficient, emissions-legal 560 horsepower and 553 foot pounds of torque without the weight and cost of a supercharger. Don’t flame me. Just dreaming.
Last edited by 40YRW8; Dec 27, 2019 at 03:08 PM.
Melting Slicks
Joined: Jun 2012
Posts: 2,226
Likes: 1,029
From: Thomas Texas
I have always been a fan of larger, normally aspirated engines. The LS7 prompted me to buy my first Corvette and I still daily drive my ‘07 Z06. Anthony, please use whatever lobbying power Katech has for GM to produce a LS2 based 427 the way they did for the LS7. Maybe a LS8? Ok, how about a large bore, shorter stroke DOHC 400 with titanium rods, valves and a 7500 red line? I would love to see a lightweight C8 Z06 built with the same philosophy as the C6 Z06. Blowers and turbos have their place. Give me torque AND light weight.
stealthtitanium
stealthtitanium
I'm sure the engineers at GM have thought about the same thing and would love to do it. But the business model (i.e. total cost to unit sales) has to make sense. I'm sure GM can build a car like this, but if the MSRP is $140,000, the number sold will be a few hundred maybe a few thousand over 5 years. From a business stand point, it would be a difficult sell to senior management. That is why GM just mounts a big, cheap supercharger on the LS/LT and calls it a day.
Pro Mechanic
Joined: Oct 1999
Posts: 3,918
Likes: 1,458
From: South-Central Coast California
Indeed.
Ya think?!
Apparently, the 2020 Stingray uses the same E99 engine controller as did the '19 ZR1 but, on C8, the E99 is integrated into GM's so-called "Global B" electrical architecture which, reportedly, incorporates additional levels of encryption. The Cadillac CT4 and CT5 are the first and second GM vehicles to use "Global B" and the C8 is the third. My guess is it's going to take a little time for the folks at Katech to "unlock" the E99 and then start developing cals for a 7.0L LT2. Yet another layer of complexity which could make calibrating a modified LT2 a challenge is GM's use of wide-band O2Ses in the engine's combustion controls.
Once tuning is unlocked we can do it.
Apparently, the 2020 Stingray uses the same E99 engine controller as did the '19 ZR1 but, on C8, the E99 is integrated into GM's so-called "Global B" electrical architecture which, reportedly, incorporates additional levels of encryption. The Cadillac CT4 and CT5 are the first and second GM vehicles to use "Global B" and the C8 is the third. My guess is it's going to take a little time for the folks at Katech to "unlock" the E99 and then start developing cals for a 7.0L LT2. Yet another layer of complexity which could make calibrating a modified LT2 a challenge is GM's use of wide-band O2Ses in the engine's combustion controls.
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Pro Mechanic
Joined: Oct 1999
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From: South-Central Coast California
Team Owner
Joined: Feb 2013
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I believe it's unlikely that anyone outside of GM "...gets the keys to tune the car". I believe the days are gone when purveyors of aftermarket calibration tools (HPT, EFILive and etc) could gain insight how a particular GM engine controller is programmed via information leaks or other "backdoor" methods. With the coming of technology such as autonomous vehicles and over the air calibration updates, the levels of encryption car companies are going to use to secure their systems are going to be extensive and are going to be based as much on risk management as they are going to be based on keeping calibration methods proprietary.
Melting Slicks
Joined: Aug 2017
Posts: 2,518
Likes: 942
From: Fl
I think porting the heads and adding E85 would make an awesome car. Pray Performance (and others) are getting 500 (575 crank) to the wheels with the LT1. Break into the ecu and let it rip. With the low gears the car would be a rocket.
Race Director
Joined: Dec 2006
Posts: 12,323
Likes: 2,873
From: Fort Worth, Texas
I remember seeing an article that had specs posted though can’t find it now, this one says more duration as well...
https://www.roadandtrack.com/new-car...nalysis-specs/
https://www.roadandtrack.com/new-car...nalysis-specs/
Advanced
Joined: Oct 2006
Posts: 54
Likes: 3
From: Royal Oak MI
I believe it's unlikely that anyone outside of GM "...gets the keys to tune the car". I believe the days are gone when purveyors of aftermarket calibration tools (HPT, EFILive and etc) could gain insight how a particular GM engine controller is programmed via information leaks or other "backdoor" methods. With the coming of technology such as autonomous vehicles and over the air calibration updates, the levels of encryption car companies are going to use to secure their systems are going to be extensive and are going to be based as much on risk management as they are going to be based on keeping calibration methods proprietary.
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
I believe aftermarket tuners are a significant part of the overall OEM marketing strategy for vehicles like Corvette, Camaro, Mustang and Challengers. SEMA is huge and I don’t see the OEMs looking to kill that. However, I wonder how the aftermarket will adapt to the drive towards electrification.
Race Director
Joined: Dec 2006
Posts: 12,323
Likes: 2,873
From: Fort Worth, Texas
I’m surprised they added any with the climate change that’s causing the imminent end of the world soon, seriously though with the 18* extra on the exhaust side I don’t understand why they didn’t let it rev to 7k as that bigger split helps carry the power past peak and the shift/rev limiter is right after peak currently?
