[Busted43]

Originally Posted by Badmojo

What is the maximum safe RWHP that the stock LT4 fuel system with a tune can support? Can the stock system support a pulley/exhaust car?

+1

[ZL1 1LE]

Originally Posted by WEAPON-X

Absolutely, always run a catch can, even with port or meth injection.

Firstly, thanks for sharing your knowledge. Secondly, do you have a recommendation for a catch can for the ZL1 LT4?

[waterman]

Originally Posted by ZL1 1LE

Firstly, thanks for sharing your knowledge. Secondly, do you have a recommendation for a catch can for the ZL1 LT4?

ZL1,

I have been researching this extensively for a few months. Background; I have seen first hand the result of valve coking, aftercooler/intercooler varnishing and combustion chamber deposits on Tier level (ECM equipped. emissions compliant) four stroke marine diesels that are not equipped with breather bypass and catch cans. All a result of direct injection.

After communicating with numerous vendors, I was most impressed with Mishimoto, Mightymouse and Elite Engineering. When Elite released the EX-2-2 stage CC it became a no brainer for me. Whatever route that you decide to pursue, make sure that you find a system that bypasses the OEM PCV. Without that bypass, all of the corrosive and clogging byproducts of blow by will continue to be introduced to your intake and then ultimately into your combustion chamber and onto intake valves.

I helped a friend install a can on his Z06 at just shy of 2000 miles. Although there was no varnishing on the intercoolers yet. The amount of oil and undoubtedly other nasty compounds inside of the SC was appalling. I only lifted the SC so there was no way to see the back side of the intake valves or the piston tops.

A CC will without question, be installed on my Z as soon as it arrives.

The question always arises; If a CC is so important, then why doesn't GM install them OEM? Easy answer, extra maintenance with a risk. If you don't remember to drain your can, your LT4 will be in a world of sh*t.

[WEAPON-X]

Originally Posted by mlee

Great Thread...!

Now we need a list of what the stock fuel system can handle.

Hope to see you guys back at the Fest this year too.

I have our X packages up now, so you can see we can go all the way up to our X800 package without touching the fuel system and we've hit nearly 700whp/wtq on our dyno with it!

Originally Posted by MR 45TH

Great write up, and thanks for the info

What would you say is on target?

That depends on the tuner, we've seen some cars come in from other shops being nearly 20% off; however, that's just asking for trouble IMO. The OEM system with 10psi wants 2,900 PSI of fuel pressure to overcome cylinder pressure. When increasing the boost 3-5 PSI, the cylinder pressure increases too, so I recommend staying as close to target as possible. It will always fluctuate some, but I like to see about -5% minimum.

Originally Posted by Badmojo

What is the maximum safe RWHP that the stock LT4 fuel system with a tune can support? Can the stock system support a pulley/exhaust car?

Originally Posted by Busted43

+1

This is subjective depending on the dyno of course since some are loose and some are stingy, but we can run our stage 4 pulley with it and hit nearly 700whp on our dyno. We did this on Hempstead's car here. I need to find his dyno to post up. Eddie @ WEAPON-X was supposed to be getting Mike's build thread up here soon anyway.

Our X800 package is about as much as you can get out of the OEM fuel system without modification:

https://weaponxmotorsports.com/produ...-zl1-gen-6-lt4

[WEAPON-X]

Originally Posted by ZL1 1LE

Firstly, thanks for sharing your knowledge. Secondly, do you have a recommendation for a catch can for the ZL1 LT4?

We're about to release a pretty revolutionary catch can, I've been working on it for a little while, trying to get back to it because I need it on my ZL1 with the turbo. Until then, this is what you'll want:

https://weaponxmotorsports.com/produ...te-cts-v-ls-lt

[ZL1 1LE]

Originally Posted by waterman

ZL1,

I have been researching this extensively for a few months. Background; I have seen first hand the result of valve coking, aftercooler/intercooler varnishing and combustion chamber deposits on Tier level (ECM equipped. emissions compliant) four stroke marine diesels that are not equipped with breather bypass and catch cans. All a result of direct injection.

After communicating with numerous vendors, I was most impressed with Mishimoto, Mightymouse and Elite Engineering. When Elite released the EX-2-2 stage CC it became a no brainer for me. Whatever route that you decide to pursue, make sure that you find a system that bypasses the OEM PCV. Without that bypass, all of the corrosive and clogging byproducts of blow by will continue to be introduced to your intake and then ultimately into your combustion chamber and onto intake valves.

I helped a friend install a can on his Z06 at just shy of 2000 miles. Although there was no varnishing on the intercoolers yet. The amount of oil and undoubtedly other nasty compounds inside of the SC was appalling. I only lifted the SC so there was no way to see the back side of the intake valves or the piston tops.

A CC will without question, be installed on my Z as soon as it arrives.

The question always arises; If a CC is so important, then why doesn't GM install them OEM? Easy answer, extra maintenance with a risk. If you don't remember to drain your can, your LT4 will be in a world of sh*t.

Thank you!

[ZL1 1LE]

Originally Posted by WEAPON-X

We're about to release a pretty revolutionary catch can, I've been working on it for a little while, trying to get back to it because I need it on my ZL1 with the turbo. Until then, this is what you'll want:

https://weaponxmotorsports.com/produ...te-cts-v-ls-lt

Thanks, any idea how long until release?

[ReevZL1]

Thanks again Weapon X for all the innovative parts you guys design, engineer, make and test. I'll be ordering your port injection, fuel system package soon!

[Ricco]

Great post. Still makes me wonder what combination of all of these options you recommend, based on power goals.

[ZL1_IslandBreeze]

outstanding writeup for the LT4

i went with #2,3,4,5 and flex fuel
did not want meth for all the quoted reasons... others dont mind meth but as you state its an option.

very happy with the build as a daily driver...

again, great writeup!

[Can'tHave2MuchHP]

This absolutely needs to be a sticky. There's questions about this damn near everyday. Good job Ben.

[Can'tHave2MuchHP]

Originally Posted by Badmojo

What is the maximum safe RWHP that the stock LT4 fuel system with a tune can support? Can the stock system support a pulley/exhaust car?

Yes it can support a Pulley/Header/Intake/Tune build. The LT4 should be able to do about 630-650 RWHP on 93 with no supplemental help.

[TDS]

Sub

[Harry76]

This is an excellent thread Ben, I plan on coming to see you this spring to see about a few more mods.
Here's my Dyno Sheet.