LPE GT21 installed and dyno numbers ls7 - Page 2 - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C6 Tech/Performance LS2, LS3, LS7, LS9 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

LPE GT21 installed and dyno numbers ls7

Reply

 
 
 
Old 02-08-2018, 07:57 PM
  #21  
MTPZ06
CF Senior Member
Support Corvetteforum!
 
MTPZ06's Avatar
 
Member Since: Dec 2008
Location: Honolulu HI
Posts: 11,233
Thanked 962 Times in 851 Posts
Default

Originally Posted by ~STOLEN~ View Post
Ti del west intake
Ferrea stainless exhaust
Solid or hollow stem?
MTPZ06 is offline  
Reply With Quote
Old 02-08-2018, 08:02 PM
  #22  
~STOLEN~
CF Senior Member
 
~STOLEN~'s Avatar
 
Member Since: Oct 2010
Location: Greenwood Indiana
Posts: 1,740
Thanked 58 Times in 48 Posts
Default

Originally Posted by MTPZ06 View Post
Solid or hollow stem?
Sorry bout that

Hollow

LPE did a port job , decked heads .010 , guides and valves all at same time for me last year
Cam is 660/670. 236/256. 111lsa
~STOLEN~ is offline  
Reply With Quote
The Following User Says Thank You to ~STOLEN~ For This Useful Post:
MTPZ06 (02-08-2018)
Old 02-08-2018, 08:11 PM
  #23  
MTPZ06
CF Senior Member
Support Corvetteforum!
 
MTPZ06's Avatar
 
Member Since: Dec 2008
Location: Honolulu HI
Posts: 11,233
Thanked 962 Times in 851 Posts
Default

Originally Posted by ~STOLEN~ View Post
Sorry bout that

Hollow

LPE did a port job , decked heads .010 , guides and valves all at same time for me last year
Cam is 660/670. 236/256. 111lsa
Wow, and you were getting float as low as 5800 rpm?
MTPZ06 is offline  
Reply With Quote
Old 02-08-2018, 08:16 PM
  #24  
~STOLEN~
CF Senior Member
 
~STOLEN~'s Avatar
 
Member Since: Oct 2010
Location: Greenwood Indiana
Posts: 1,740
Thanked 58 Times in 48 Posts
Default

Yup
Here is the last run when they were floating (blue)and the 1st run after springs were changed (red)

I don't have a pic on the final graph but this is a pretty good representation
Attached Images  
~STOLEN~ is offline  
Reply With Quote
The Following User Says Thank You to ~STOLEN~ For This Useful Post:
MTPZ06 (02-08-2018)
Old 02-11-2018, 09:34 AM
  #25  
handyandy1496
CF Member
 
handyandy1496's Avatar
 
Member Since: Jul 2017
Location: Tarpon Springs FL
Posts: 97
Thanked 4 Times in 4 Posts
Default

Your right about having more in it because you took too much off the push rod length. You forgot there is a 1.8 ratio rocker in between. Your pushrods only needed to come down .033 to allow for the extra .060 on top of the valve. You now have .050 less lift than your cam card says it is and a little less duration as well. lol. No wonder your low end is better. It all makes cense now. You should get your old launch back with a lot more on top. probably a high 9 sec pass is in your future. GL
handyandy1496 is offline  
Reply With Quote
Old 02-11-2018, 11:39 PM
  #26  
rsigue
CF Senior Member
Thread Starter
 
rsigue's Avatar
 
Member Since: Oct 2012
Location: lafayette louisiana
Posts: 225
Thanks: 0
Thanked 1 Time in 1 Post
Default Push rods

7.800 is factory so adding lash caps to exhaust we went with 7.750 push rods. On the exhaust. Where we first put 7.725 we realized that was too short An corrected our mistake today. Thanks for the info. Dino again tomorrow.
rsigue is offline  
Reply With Quote
Old 02-12-2018, 04:08 AM
  #27  
LSxhotrod
Junior Member
 
Member Since: Oct 2017
Posts: 25
Thanked 1 Time in 1 Post
Default

I build one LS7 with GT21 and Ported stock heads, car made 597whp.
LSxhotrod is offline  
Reply With Quote
Old 02-12-2018, 05:28 AM
  #28  
irok
CF Senior Member
 
Member Since: May 2011
Location: OSHAWA ONTARIO
Posts: 2,559
Thanks: 0
Thanked 196 Times in 183 Posts
Default

Originally Posted by rsigue View Post
7.800 is factory so adding lash caps to exhaust we went with 7.750 push rods. On the exhaust. Where we first put 7.725 we realized that was too short An corrected our mistake today. Thanks for the info. Dino again tomorrow.
you don't need to change push rod length when you add lash caps.check with an engine builder
irok is offline  
Reply With Quote
Old 02-12-2018, 08:15 AM
  #29  
jayyyw
CF Senior Member
 
Member Since: Jun 2015
Location: Austin Tx
Posts: 2,044
Thanked 181 Times in 169 Posts
Default

Originally Posted by rsigue View Post
7.800 is factory so adding lash caps to exhaust we went with 7.750 push rods. On the exhaust. Where we first put 7.725 we realized that was too short An corrected our mistake today. Thanks for the info. Dino again tomorrow.
Did you measure or are you just guessing?
jayyyw is offline  
Reply With Quote
Old 02-13-2018, 07:39 PM
  #30  
rsigue
CF Senior Member
Thread Starter
 
rsigue's Avatar
 
Member Since: Oct 2012
Location: lafayette louisiana
Posts: 225
Thanks: 0
Thanked 1 Time in 1 Post
Default Push rods

Definetly measured, by a ls tech, didnt want to take a chance since LPE wanted to cut the valve stems, to put lash caps on... We just adjust the push rods to the right length...Damn sure no guessing here too much too loose with this motor,,,, Was not gonna take any chances,
rsigue is offline  
Reply With Quote
Old 02-13-2018, 07:45 PM
  #31  
rsigue
CF Senior Member
Thread Starter
 
rsigue's Avatar
 
Member Since: Oct 2012
Location: lafayette louisiana
Posts: 225
Thanks: 0
Thanked 1 Time in 1 Post
Default 2nd DYNO!!!

Change push rod lengths and made a 2nd dyno secession solved a few issues, with push rod lengths and minor stuff.... Horsepower picked up 12 more ponys and torque picked up 30 more lbs...
rsigue is offline  
Reply With Quote
Old 02-18-2018, 12:00 PM
  #32  
jayyyw
CF Senior Member
 
Member Since: Jun 2015
Location: Austin Tx
Posts: 2,044
Thanked 181 Times in 169 Posts
Default

Originally Posted by rsigue View Post
Change push rod lengths and made a 2nd dyno secession solved a few issues, with push rod lengths and minor stuff.... Horsepower picked up 12 more ponys and torque picked up 30 more lbs...
Nice jump. Should feel much different
jayyyw is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread
Quick Reply: LPE GT21 installed and dyno numbers ls7


Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

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: