don't do it. We unfortunately found out the hard way..
Lash caps
Safety Car
Joined: Sep 2006
Posts: 4,364
Likes: 408
From: Greer, SC
I agree, don't do it! My tuner said it was not needed even at 700 RWHP. I have not had any fueling issues since my mods went in. If you need a higher volume pump, you will need to break down and by the Z06 pump. I think they are around 850.00
Instructor
Joined: Feb 2005
Posts: 222
Likes: 10
From: Las Vegas NV
Has anyone had a positive experience with the lash cap? I had one installed before reading about the nightmare situations others have had. I have not had any problems with it... is this something I should be concerned about or are most of the problems occurring during install or when paired with the z06 HP fuel pump?
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
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Supporting Vendor
Joined: Feb 2009
Posts: 4,417
Likes: 1,424
From: Mesa Az
Done quite a few especially in the beginning of this all w/ zero failures to date. Not saying we are doing some magical other's are not but never had a failure. I always prefer doing the C7Z pump if money allows and no cam has been installed.
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
I know some people have dropped theirs into their motor while trying to install it. But do you know of any instances where one has fallen out after already being installed?
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
the lash cap created enough lift on the pump rod to push the LT4 pump off the block by shearing the mounting bolts!!
I couldn't figure out why I lost control of fueling until I pulled the intake. Oh ****!!!
Anyways, installed a new one with no lash cap, it still holds pressure but the LT4 injectors are too small for my application so I am waiting on an Alky Control kit to arrive.
Last edited by Higgs Boson; Dec 11, 2015 at 10:53 AM.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
apparently the LT4 stroke is shorter than LT1 so it is more risky than the LT1 with lashcap.
also, the 2015s have a lot of similar fuel pump data LT1 vs LT4. The 2014s were different, maybe different FPCM or something.
let me know if you need any help with data.
also, the 2015s have a lot of similar fuel pump data LT1 vs LT4. The 2014s were different, maybe different FPCM or something.
let me know if you need any help with data.
Drifting
Joined: Jul 2005
Posts: 1,646
Likes: 188
Higgs I recall you having crazy fuel trims using lt4 injector data on your 14..... I'm going to use stock lt4 hpfp data for now and attempt to install lt4 injector data if I have the same issues I may just keep the injector data stock for the lt1 or just change from 121 to 140 for the injector size and retry....