The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Racing and high performance (trucks haulin more than hay)

Web 67-72chevytrucks.com


 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 05-29-2015, 02:22 AM   #1
Super73
Registered User
 
Super73's Avatar
 
Join Date: Nov 2007
Location: Bay Area, Ca
Posts: 2,841
On the dyno in the am

Putting the truck on the dyno again in the morning. Changes since last time:

Cam went from 254/260 .630/.625 111icl 112lsa to 259/274 .663/.624 109 icl 113 lsa
Gear change 4.56 to 3.90

The truck also lost 80lbs, not that that affects the dyno numbers but it slowed down NA from 10.38 @ 127 to 10.6x @ 126mph.
60' slowed from 1.53 to 1.61.
1/8 mph went from 105.x to 103.
I know different air will have an effect as well..

It did go faster than it ever has though on bottle.

Thoughts on the slow down:
Cam has more overlap and opens the exhaust valve quite a bit earlier and is much more of a N20 cam. I am guessing it moved peak TQ further up RPM making the verter even less optimized NA.
Gear also slowed 60' down.
With the glides shift extension again slowing it down more due to TQ peak and recovery
Perhaps I need to move the 1-2 shift up in RPM, the dyno will help tell me that.

I guess i will find out in the morning. If the cam doesn't make more on the bottle than last time, I will most likely switch back or try another one I have 251/266 .632/.597 108icl 112lsa.

We will see..
__________________
------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
Super73 is offline   Reply With Quote
 

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:39 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com