Went to the dragstrip.
Apr 22, 2005 | 10:35 AM
#31
On The Tree
Joined: Apr 2004
Posts: 126
Likes: 0
From: Gainesville, FL
Originally Posted by lotzafun
The reason that I did away with the MAF was that I could not get rid of surging up and down at idle, and LTFT would not lean out, it was always rich. So I tuned my truck using HP Tuners to run without the MAF sensor. Also not into running too many RPM's, so will stick with 5,200 rpm shift points. This is a daily driver, so will look for other ways to get my times down, maybe shed some weight off the truck. Has anyone found CalTracs to be helpful on a full size truck?
Apr 22, 2005 | 10:57 AM
#33
14 Second Truck Club
iTrader: (31)
Joined: Oct 2004
Posts: 2,619
Likes: 1
From: Chicago, Il
Originally Posted by F8L Z71
Also, even on the stock cam (peaks at 5200rpm) reving it out to 6k and staying in the lower gears longer does indeed improve 1/4mile times. That is why people see a .4 gain in the 1/4mile with the stupid HPP3. 
I also dont see the reason for installing a cam and not really using it. The main way most cams make horsepower is by raising the power band further into the higher rpm's, even the additional torque is usually at a higher rpm which is why most cams require a stall to work properly(driveability). You are adding stress to the motor by just adding more power in general, so why not use all that power? It isnt like you are running it to 6k every shift.
Apr 22, 2005 | 11:13 AM
#36
12 Second Truck Club
Joined: Feb 2002
Posts: 5,575
Likes: 0
From: Sacramento, CA
I agree totally. I was just keeping things simple. LOL Shift extension is very important.
I'm a junkie so my truck shifts at or over 6k all ther time. I'm the type that has to floor it at least 3-4 times a day.
I'm a junkie so my truck shifts at or over 6k all ther time. I'm the type that has to floor it at least 3-4 times a day.
Apr 22, 2005 | 11:37 PM
#38
Originally Posted by lotzafun
Just looking for some answers after going to the dragstrip. The best that I could run was 15.3 @ 85 MPH. The truck did have some traction issues, but the main issue it had was when it went into 3rd gear. The truck would pull hard all the way through 2nd gear, but when it hit 3rd gear it would drop rpms to around 3,000 rpm's and felt like a boat anchor had been tossed out the back.
My questions is this. Has anyone had this same problem, or have I overlooked something. With the mod's that I have made it should have been in the 14's but some of the tire spin hurt on ET. Seems like it should pull as hard in 3rd as it does in other gears, but it feels like it just quits pulling.
If anyone has some ideas, please share them here, my mod's are listed below. Thanks.
My questions is this. Has anyone had this same problem, or have I overlooked something. With the mod's that I have made it should have been in the 14's but some of the tire spin hurt on ET. Seems like it should pull as hard in 3rd as it does in other gears, but it feels like it just quits pulling.
If anyone has some ideas, please share them here, my mod's are listed below. Thanks.
https://ls1tech.com/forums/showthrea...locking+up+3rd
I was out racing some buddies tonight and couldnt figure why it always fealt like a dog when around 80 in third I couldnt get the converter to unlock I looked at the
TCC apply/release speed vs gear
and the answer was apparent the converter will lock in third at 80 no matter what so after studying tables came across this link and the guy that posted the screen shots seems to have worked out some really nice tables.
Now all I need is a laptop to start tuning
my next mod is going to be hp tuners fo sho
Nothing is gonna break if the cam swap was done properly. Good luck. You should be able to hit at least 95 mph.
Apr 23, 2005 | 01:55 PM
#40
Thread Starter
On The Tree
Joined: Aug 2004
Posts: 138
Likes: 0
From: Camby, IN
Wow, this is some great info put up here, will have to fire up the ole laptop and make some changes. Changing the shift point to 6,000 and then will make lock up changes. Will look for next day that I can get to the track and try out changes. Still feel that 14's are achievable without changing gears.
CashDudeHomie - What are your mods to be able to run 13's
CashDudeHomie - What are your mods to be able to run 13's