Supercharged LT4 problems

Nor Cal ZL1 · 10-21-2015, 08:13 AM

Testing of the new Caddy CTSV with the supercharged LT4 has the same issues as the Zo6.......overheating and limp mode. There is no way that the LT4 is going to work in the ZL1 without some serious work esp at some of the speculated power output I read in this forum.

http://corvettec7fiasco.blogspot.com...w=magazine&m=1

https://www.yahoo.com/autos/s/2016-c...163032425.html

GretchenGotGrowl · 10-21-2015, 08:19 AM

Quote:

Originally Posted by Nor Cal ZL1

Testing of the new Caddy CTSV with the supercharged LT4 has the same issues as the Zo6.......overheating and limp mode. There is now way that the LT4 is going to work in the ZL1 without some serious work esp at some of the speculated power output I read in this forum.

http://corvettec7fiasco.blogspot.com...w=magazine&m=1

https://www.yahoo.com/autos/s/2016-c...163032425.html

If you put any stock in what PeterMJ says about GM and the Vette then you are definitely drinking the Koolaid. He's got some beef with GM and put up is blogspot with the sole purpose to hurt them. As for the Yahoo review, well that's one instance and it is very short on details. Of the over 8K 2015 MY Z06s how many have had theirs go into limp mode?

SpeedIsLife · 10-21-2015, 08:27 AM

Overheating is a topic that the various C7 forums have a lot of...

I'd say it's a known issue and not isolated. I really don't get the gut driven rush to defend GM on this..holding their feet to the fire will result in improving the technology..which is needed.

GretchenGotGrowl · 10-21-2015, 09:02 AM

Quote:

Originally Posted by SpeedIsLife

Overheating is a topic that the various C7 forums have a lot of...

I'd say it's a known issue and not isolated. I really don't get the gut driven rush to defend GM on this..holding their feet to the fire will result in improving the technology..which is needed.

Yes, there seems to be an issue with the automatic Z51s and GM stepped up and added more cooling in the 2016 MY. As for the "overheating" of the LT4 engine, GM has stated that there have been a few customers that have experienced it and the issue was tracked down to improperly bled cooling systems. Otherwise, they maintain it is doing what they designed it to do. Maybe you can argue they are too conservative with the tune, but they have to worry about warranty claims on a very expensive motor. A few unhappy people (like PeterMJ) can make a lot more noise than the lots of happy people. I for one wouldn't hesitate getting a Z** with the LT4 and 8L90, if I didn't already have that combination in my Z06. I just am not motivated to start a blogspot to rant and rave about how happy I am with the Z06...I'd rather be driving it.

For all those that are worried about he 8L90, LT4 and LTG "issues" you don't have to buy one. There are other options. You also don't have to make mountains out of mole hills.

Bhobbs · 10-21-2015, 09:19 AM

Looking at the front of the LT4 Z**, it looks like Team Camaro is taking cooling very seriously. I hope they get it right.

Agarc · 10-21-2015, 09:25 AM

a buddy of mine tracks his zo6 in those hpde events and around the 7-8 lap his car goes into limp mode with his oil temps reaching 280+ but his is a stick

KaBoom1701 · 10-21-2015, 10:50 AM

How hard is to add a larger HX and or radiator to these LT4 engines?

GretchenGotGrowl · 10-21-2015, 11:30 AM

Quote:

Originally Posted by KaBoom1701

How hard is to add a larger HX and or radiator to these LT4 engines?

It might be hard to do on the Vette, but I think it will be an option for the Camaro and CTS-V.

DenverTaco07 · 10-21-2015, 11:48 AM

Originally Posted by MEDISIN View Post
Let's keep some things in perspective.
Journalists from the big 3 automotive magazines - MotorTrend, Car&Driver and Road&Track did not experience heat soak, limp mode, pulled timing etc. Car&Driver ran 12-15 laps in 100F heat with the V without issues (setting a Lightning Lap sedan record in the process). Before you think they might not mention heat-soak in the article, they pointed out that both the Eco-burst and GT experienced heat-related performance hits.
Dozens of bloggers (DigitalTrends, Autoblog, TechTimes, Slashgear etc) got seat time in the CTS-V with no mention of heat soak, limp mode, pulled timing etc.
I had not heard of Boldride before seeing this thread. They started 4 years ago posting pics and vids of imports. Haven't seen much positive written about any domestic cars.
The author mentions only subjective impressions (it felt slow) without recording any performance metrics or conducting tests of any kind.

This is the first I've heard of any 2016 V going into limp mode from excessive heat. If I've missed something in previous write-ups, please point it out. I'm not saying it can't/won't happen, but this doesn't sound like a rampant problem in the V based on experience to date.

http://www.camaro5.com/forums/showth...=426261&page=2

DenverTaco07 · 10-21-2015, 12:00 PM

Probst didn't get any limp at Willow Springs. the other guy also no heat soak on his numerous hill climbs.

IneedAZ · 10-21-2015, 12:58 PM

not that they will, but they should go twin turbo or maybe centrifugal supercharger to help with heat

Slickcas · 10-21-2015, 02:02 PM

Funny you should say twin turbo. GM has a few LT TT's there testing. I hear one is a shorter stroke 6.2 at around 5.4L. Think of a 6.2 with a 4.8 forged crank shaft. The stock LT4 heads would flow very good is only pushing 5.4L. Should do very well against F@&$'s Eco-boost 5.0 that's in the works.
But we will be the stuck the crappy LT4 , I will be ordering a 17' with the A8 BTW!!!

Dutchman427 · 10-22-2015, 12:23 AM

I am not impressed at all with the Gen V LT4. If I were to get a Gen6 Camaro with the LT4 I would have Jeremy Formato of FasterProms do the work. He seems to make it happen. This will not happen, but I would rather see GM put the LS9 in the Gen6 Camaro ZL1-or Z/28 or what ever they name it.

DrkPhx · 10-22-2015, 09:08 AM

GM isn't going to put the LS9 in a new model. It will now live on as a crate motor. The issue with the LT4 isn't the motor itself, but rather the small supercharger which was selected because of the low roof line on the C7. The poor cooling on the ZO6 is due to the tight engine compartment and front end layout. The Camaro doesn't have those restrictions, so I'm pretty sure they will be a none issue. I'm also going to guess they put a larger SC on the Camaro Z car to bump hp but more importantly to allow the SC to run at a lower speed, thus reducing heat. A pure guess on my part.

10-21-2015, 08:13 AM	#1
Nor Cal ZL1 Drives: 2013 ZL1 M6 Join Date: Oct 2013 Location: Nor Cal Posts: 1,825	Supercharged LT4 problems Testing of the new Caddy CTSV with the supercharged LT4 has the same issues as the Zo6.......overheating and limp mode. There is no way that the LT4 is going to work in the ZL1 without some serious work esp at some of the speculated power output I read in this forum. http://corvettec7fiasco.blogspot.com...w=magazine&m=1 https://www.yahoo.com/autos/s/2016-c...163032425.html

10-21-2015, 09:19 AM	#5
Bhobbs Drives: 2015 SS 1LE Red Hot, 1970 Chevelle Join Date: Apr 2012 Location: Chino, CA Posts: 6,989	Looking at the front of the LT4 Z**, it looks like Team Camaro is taking cooling very seriously. I hope they get it right. __________________

10-21-2015, 09:25 AM	#6
Agarc Dr.Frankenstein Drives: 15gt Join Date: Jul 2011 Location: MIA Posts: 1,568 View My Garage	a buddy of mine tracks his zo6 in those hpde events and around the 7-8 lap his car goes into limp mode with his oil temps reaching 280+ but his is a stick __________________ Carandsoulcustoms puntocomm

10-21-2015, 10:50 AM	#7
KaBoom1701 KaBoom1701 Drives: 13' ZL1 Red M6 Join Date: Dec 2012 Location: I.E. SoCal (Yucaipa) Posts: 8,630	How hard is to add a larger HX and or radiator to these LT4 engines? __________________ Mods: Roto-Fab Intake, WW Res. kit & Big Gulp Air Scoop, Elite Catch Can, ATI Super Damper & 18% OD Pulley, LF Idler pulley bracket, Metco CC breather, ID850 Injectors, Stainless Power Headers w/ ceramic coating, TR71X Spark Plugs, JMS Fuel Pump Booster, Bo White TB, Tuned by Ted @ Jannetty Racing, Ron Davis HX, D3 Reservoir, Pfadt 1" Springs, Moreno Camber Plates, ZL1 Addons Splitter guard washers, Tow Hook kit & rock guards, Hurst Shifter Billet Plus 6 Speed Short Shifter, ZL1 DRL lighting harness, ZL1 Recaro Seats.

10-21-2015, 11:48 AM	#9
DenverTaco07 Drives: 2017 SS 1LE, 2017 Volt, 2013 Pilot Join Date: May 2014 Location: Colorado Posts: 4,274	Originally Posted by MEDISIN View Post Let's keep some things in perspective. Journalists from the big 3 automotive magazines - MotorTrend, Car&Driver and Road&Track did not experience heat soak, limp mode, pulled timing etc. Car&Driver ran 12-15 laps in 100F heat with the V without issues (setting a Lightning Lap sedan record in the process). Before you think they might not mention heat-soak in the article, they pointed out that both the Eco-burst and GT experienced heat-related performance hits. Dozens of bloggers (DigitalTrends, Autoblog, TechTimes, Slashgear etc) got seat time in the CTS-V with no mention of heat soak, limp mode, pulled timing etc. I had not heard of Boldride before seeing this thread. They started 4 years ago posting pics and vids of imports. Haven't seen much positive written about any domestic cars. The author mentions only subjective impressions (it felt slow) without recording any performance metrics or conducting tests of any kind. This is the first I've heard of any 2016 V going into limp mode from excessive heat. If I've missed something in previous write-ups, please point it out. I'm not saying it can't/won't happen, but this doesn't sound like a rampant problem in the V based on experience to date. http://www.camaro5.com/forums/showth...=426261&page=2 __________________ 2017 SS 1LE \| HBM \| Vortech V3-Si supercharger (620RWHP and 575ft lbs) \| PDR \| Black Bowties \| Illuminated Front Black Bowtie \| Illuminated Door Sills \| Smoked Tails \| vented seats mod

10-21-2015, 08:27 AM	#3
SpeedIsLife Drives: Current Camaro-less Join Date: Jul 2014 Location: Oregon Posts: 3,242	Overheating is a topic that the various C7 forums have a lot of... I'd say it's a known issue and not isolated. I really don't get the gut driven rush to defend GM on this..holding their feet to the fire will result in improving the technology..which is needed.

10-21-2015, 12:58 PM	#11
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	not that they will, but they should go twin turbo or maybe centrifugal supercharger to help with heat __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

10-21-2015, 02:02 PM	#12
Slickcas Drives: 12' 2SS/RS LS3 IBM Join Date: Nov 2011 Location: Odin. ILL Posts: 487 View My Garage	Funny you should say twin turbo. GM has a few LT TT's there testing. I hear one is a shorter stroke 6.2 at around 5.4L. Think of a 6.2 with a 4.8 forged crank shaft. The stock LT4 heads would flow very good is only pushing 5.4L. Should do very well against F@&$'s Eco-boost 5.0 that's in the works. But we will be the stuck the crappy LT4 , I will be ordering a 17' with the A8 BTW!!!

10-22-2015, 12:23 AM	#13
Dutchman427 Drives: 2012 ZL1 #1329 M6 Join Date: Jun 2009 Location: Reading, PA Posts: 1,040	I am not impressed at all with the Gen V LT4. If I were to get a Gen6 Camaro with the LT4 I would have Jeremy Formato of FasterProms do the work. He seems to make it happen. This will not happen, but I would rather see GM put the LS9 in the Gen6 Camaro ZL1-or Z/28 or what ever they name it. __________________ 2012 Camaro ZL1 #1329 M6 Summit White Built by Mike @ Rapid Motorsports 784rwhp 757 rwtq on 93 Octane ET - 10.97 @ 128 Heads-Blower-Snout-TB ported & prepared by Jeremy Formato of FasterProms http://www.camaro5.com/forums/showthread.php?t=395950 Rapid Motorsports 396ci Build https://www.camaro5.com/forums/showt...1#post10321301 10.832 @ 130.99

10-22-2015, 09:08 AM	#14
DrkPhx Drives: 2013 Triple Black ZL1 / 2006 TB SS Join Date: Feb 2011 Location: MN Posts: 2,250	GM isn't going to put the LS9 in a new model. It will now live on as a crate motor. The issue with the LT4 isn't the motor itself, but rather the small supercharger which was selected because of the low roof line on the C7. The poor cooling on the ZO6 is due to the tight engine compartment and front end layout. The Camaro doesn't have those restrictions, so I'm pretty sure they will be a none issue. I'm also going to guess they put a larger SC on the Camaro Z car to bump hp but more importantly to allow the SC to run at a lower speed, thus reducing heat. A pure guess on my part.

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