Notices
Forced Induction Superchargers | Turbochargers | Intercoolers

2000 Z28 6.0 LY6 7875 Turbo Build

 
Old 05-24-2019, 12:50 PM
  #441  
TECH Addict
Thread Starter
iTrader: (1)
 
Join Date: Jan 2012
Location: Houston
Posts: 2,072
Likes: 0
Received 4 Likes on 3 Posts
Default

Nope, with 4 kids there's practically something I have to go to every weekend
MY_2K_Z is offline  
Old 05-24-2019, 12:57 PM
  #442  
TECH Fanatic
iTrader: (1)
 
Kfxguy's Avatar
 
Join Date: Apr 2017
Posts: 1,640
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by 47ford View Post
There is no issue with the t4 stuff (ask truckdoug) but the units are a lot more expensive due to them being “custom”. So if you can do a flange change it makes life easier and cheaper.... the on3 78/75 turbo is a nice unit but the other turbo they offer have the same size turbine so it’s doesnt make much sense to me to swap to one of those.... talk to Jose at forces inductons he will tell you a turbo that has a compressor bigger than the turbine is silly.... if you end up doing twin 78/75 you won’t be disappointed... it will be laggy but who gives a ****.... I have a friend who put twin 78/75 on an ly6 in a GMC Sierra made 600 hp/tq on 11 lb

The on3 and vsr units i linked to have 3.5" outlets instead of 3" outlets and on one of them the ar is higher. I assumed this meant that it flowed more at the expense of spooling speed? i still cant imagine his setup being only .3 liter more, causing his to pull 1200 rpm less than mine. i just dont see it. 500 rpm maybe. but not 1200. I just limit it to 7200 because its a stock bottom end, but it really doesnt seem to fall off there either. I actually lowered my shift points to 6800ish because longevity needs to factor in for now.
Kfxguy is offline  
Old 05-24-2019, 01:05 PM
  #443  
TECH Addict
Thread Starter
iTrader: (1)
 
Join Date: Jan 2012
Location: Houston
Posts: 2,072
Likes: 0
Received 4 Likes on 3 Posts
Default

If you turned the boost up you would notice it. It doesn't fall on its face I can just feel that it's not making power up there. It revs clean to 7800 just doesn't make anything up there.
MY_2K_Z is offline  
Old 05-24-2019, 01:51 PM
  #444  
TECH Fanatic
iTrader: (1)
 
Kfxguy's Avatar
 
Join Date: Apr 2017
Posts: 1,640
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by MY_2K_Z View Post
If you turned the boost up you would notice it. It doesn't fall on its face I can just feel that it's not making power up there. It revs clean to 7800 just doesn't make anything up there.

Heres how I've always thought. I may be wrong, but i dont care and i dont think I am. So...

say my engine pulls hard to 6500. But it will keep going strong to 7000. Like it doesnt nose over, and it will pull it no problem....but maybe the rpm acceleration slows up a little bit from 6500 to 7000. My rpm drops on the shift to 5400 shifting at 7000....which is right around my tq peak. On the other hand say I shift at 6500 right where it peaks off....my rpm drops to 4700-4800.....below my tq peak so it has to climb its way back to 5400 and then pass it up. My theory and observation and time slips tell me that a slip "over rev" is beneficial in every case i've used it. My theory of why is because at higher rpm i'm making more hp than at lower rpm. I tend to still use this same analogy on my turbo car because i'd rather shift higher and not lug it with a lower shift....which I've read may result in bent stock connecting rods. Its a balancing act. But hey, do whatever suits you. If you dont like the twins, you can always change it. Its nothing but time and money.

i'm still interested in seeing what the car will run right now. I bet it'll run 10.50 or better. You need to go run it.
Kfxguy is offline  
Old 05-24-2019, 04:23 PM
  #445  
TECH Addict
Thread Starter
iTrader: (1)
 
Join Date: Jan 2012
Location: Houston
Posts: 2,072
Likes: 0
Received 4 Likes on 3 Posts
Default

It'll go 9s as it sits. Like I said the car revs out fine but it's not picking up any power. Like I said turn yours up and you will see the same thing. And I'm on the same page with you on shift point and extension. I usually run mine out to 7200 and it drops to 6000 on the shift. Easy on the rods well past peak torque. Like I said I might go with a big single twins just seems like the easy option as far as power potential. We'll see how it goes.
MY_2K_Z is offline  
Old 07-02-2019, 12:15 PM
  #446  
TECH Enthusiast
iTrader: (23)
 
ryeguy2006a's Avatar
 
Join Date: Apr 2012
Posts: 744
Received 0 Likes on 0 Posts
Default

Love the build! Maybe I missed it but what manifolds did you use for the original build? And was that dirty dingo power steering bracket the one that relocates it down and towards the water pump?
ryeguy2006a is offline  
Old 07-02-2019, 03:39 PM
  #447  
TECH Addict
Thread Starter
iTrader: (1)
 
Join Date: Jan 2012
Location: Houston
Posts: 2,072
Likes: 0
Received 4 Likes on 3 Posts
Default

Originally Posted by ryeguy2006a
Love the build! Maybe I missed it but what manifolds did you use for the original build? And was that dirty dingo power steering bracket the one that relocates it down and towards the water pump?
They are just 2 passenger truck manifolds. The dirty dingo kit is the 98-02 camaro setup but on truck spacing
MY_2K_Z is offline  
Old 07-03-2019, 02:52 PM
  #448  
TECH Enthusiast
iTrader: (23)
 
ryeguy2006a's Avatar
 
Join Date: Apr 2012
Posts: 744
Received 0 Likes on 0 Posts
Default

Perfect, thanks man.
ryeguy2006a is offline  
Old 07-12-2019, 03:01 AM
  #449  
Teching In
 
Join Date: Dec 2014
Posts: 44
Likes: 0
Received 0 Likes on 0 Posts
Default

Something you don't see allot of people mention vs racing 7875 has a 3" inlet on the compressor and 2.5 inch out while most other vendors haver a 3" in and out on the compressor cover. Small compressor AR vs larger.
If you get on ebay search 7875c billet wheeled 7875s can be had for 270$ with the larger compressor cover. In multiple AR options .I bought a cast one last year it's been great. It's a clone of the turbonetics HP78 .
mrich0908 is offline  
 


Thread Tools
Search this Thread
Quick Reply: 2000 Z28 6.0 LY6 7875 Turbo Build


About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: