Direct Port DynoToday (544/540 on 150-shot) - LS1TECH

Log In 


Nitrous Oxide Installation | Tuning | Products

Direct Port DynoToday (544/540 on 150-shot)

Reply
 
Thread Tools Search this Thread
Old 04-27-2003, 08:10 PM   #1
Brought out of retirement Super Moderator
Thread Starter
iTrader: (7)
 
Reckless's Avatar
 
Join Date: Nov 2001
Location: Killeen, TX
Posts: 9,847
Default Direct Port DynoToday (544/540 on 150-shot)

OBTW, this setup can be yours for $2500 (see classifieds)

Red graph is motor pull and blue graph is 150-shot pull (155/175 gain with 12:1 a/f ratio).

Reckless is offline   Reply With Quote
Old 04-27-2003, 11:05 PM   #2
TECH Senior Member
 
BIGBOS's Avatar
 
Join Date: Nov 2001
Location: Chi-Town, IL
Posts: 11,604
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Do you still have the TH350 in the car, those are some good #'s...
BIGBOS is offline   Reply With Quote
Old 04-28-2003, 07:21 AM   #3
Brought out of retirement Super Moderator
Thread Starter
iTrader: (7)
 
Reckless's Avatar
 
Join Date: Nov 2001
Location: Killeen, TX
Posts: 9,847
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Quote:
Do you still have the TH350 in the car, those are some good #'s...
Hey Bos...TH350 is gone. This was through an MN6 with stock rear (3.42s).

Todd
Reckless is offline   Reply With Quote
Old 04-28-2003, 09:43 AM   #4
Launching!
 
Join Date: Nov 2001
Location: Dallas, Tx
Posts: 289
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Quote:
Thats one hell of a lean spike around 3600.
Sure is...Reckless, did you purge the fuel side before you made these runs??

Chris
Cmarsh93z is offline   Reply With Quote
Old 04-28-2003, 10:02 AM   #5
Brought out of retirement Super Moderator
Thread Starter
iTrader: (7)
 
Reckless's Avatar
 
Join Date: Nov 2001
Location: Killeen, TX
Posts: 9,847
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Yeah I noticed that too. Did not purge the fuel. What is a good way to do that? Other than arming with the bottle closed and flooring the car.

The fuel system/pump is already running when I hit it. It has a built in return to keep the pressure up. But it takes a secong to load into the rails. I don't know if there is a good way to load the rails without the vacuum from the motor pulling the fuel out of the rails
Reckless is offline   Reply With Quote
Old 04-28-2003, 10:29 AM   #6
TECH Fanatic
iTrader: (12)
 
Join Date: Jan 2002
Location: Tomball, TX
Posts: 1,737
Default Re: Direct Port DynoToday (544/540 on 150-shot)

I would think the motor would suck the fuel in. One solution could be to run fuel solenoids directly off the rails that way you don't have the 12-18" of lines and the long fuel rails to fill up before it starts going. You could probably leave the nitrous side the way it is now and things might click together at the right time then (or at least closer than they do now).
xaon is offline   Reply With Quote
Old 04-28-2003, 10:52 AM   #7
TECH Senior Member
 
BIGBOS's Avatar
 
Join Date: Nov 2001
Location: Chi-Town, IL
Posts: 11,604
Default Re: Direct Port DynoToday (544/540 on 150-shot)

This is a main reason why I stepped out of the nitrous world, but even now that I'm in the F.I. world, I'm still having issues, even built motors can be destroyed off of spikes like that...hes got enough fuel, its just all in the setup...
BIGBOS is offline   Reply With Quote
Old 04-28-2003, 01:07 PM   #8
Dumb Ass Vette Moderator
iTrader: (20)
 
ls1290's Avatar
 
Join Date: Jun 2002
Location: Colorado
Posts: 4,245
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Quote:
I don't know if there is a good way to load the rails without the vacuum from the motor pulling the fuel out of the rails
I know that MagnaFlow just came out with a fuel line bleeder that will bleed the air out of the line up to the fuel solenoid. The best way to feed a rail is from both ends. Remember that a Fogger fuel pump is only about 19-25 psi.

ls1290 is offline   Reply With Quote
Old 04-28-2003, 01:19 PM   #9
Launching!
 
Join Date: Nov 2001
Location: Dallas, Tx
Posts: 289
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Reckless....yes, with the car off and the system armed, you can activate the kit for a split second with the bottle closed. Also, right before the line goes into the fuel solinoids, you can install a T fitting with a bleeder in it, or a very small jet. Does your fuel system come on when the kit is "armed", or when its actually activated?

Chris
Cmarsh93z is offline   Reply With Quote
Old 04-28-2003, 03:52 PM   #10
Vroooom!!!
iTrader: (7)
 
Louis's Avatar
 
Join Date: Nov 2001
Location: Frisco/Wylie
Posts: 4,169
Default Re: Direct Port DynoToday (544/540 on 150-shot)



Heres my NA graph No nitrous, no power adder, Same spike. Its because the Exhaust from the car before the pull is still in the copper tubing, Do the pull, and its taking readings from the old exhaust before the fresh stuff makes it to the WB. Use the WB in the actual collector, and it will be gone.

Louis
Louis is offline   Reply With Quote
Old 04-28-2003, 04:13 PM   #11
Brought out of retirement Super Moderator
Thread Starter
iTrader: (7)
 
Reckless's Avatar
 
Join Date: Nov 2001
Location: Killeen, TX
Posts: 9,847
Default Re: Direct Port DynoToday (544/540 on 150-shot)

Chris...the fuel system starts pumping when the system is armed. Fuel should be up to the noid while armed. But it is at such low pressure right now. I had to back it down to 6.5psi to get to 12:1 afr.

Maybe I should jet down on the fuel and run a higher pressure?

Louis...we were using a tailpipe sniffer on the dyno, but old exhaust? Are you sure you haven't been sniffing some exhaust yourself?

If this is true, why is there no lean spike on my NA pull?
Reckless is offline   Reply With Quote
Old 04-28-2003, 04:26 PM   #12
Vroooom!!!
iTrader: (7)
 
Louis's Avatar
 
Join Date: Nov 2001
Location: Frisco/Wylie
Posts: 4,169
Default Re: Direct Port DynoToday (544/540 on 150-shot)

OK, I know its not easy to understand over the net, find me at the NvS, and Ill explain

If you decel before a pull, say-go up to 4k in 4th, and then decel to 3k, then begin the pull- what happens is that the lean exhaust from decel ( Read: OLD EXHAUST :p) is just gettting to the WB when your pull begins- thats where the spike comes from. The WB through a tail pipe will allways be behind a few hundred rpms due to the fact that it takes time for the exhaust to travel from the tailpipe to the WB.

PM Me your # and Ill explain it a little better in person if need be

Louis
Louis is offline   Reply With Quote
Old 04-29-2003, 01:23 PM   #13
Moderator
 
Join Date: Oct 2002
Location: Aurora IL
Posts: 321
Default Re: Direct Port DynoToday (544/540 on 150-shot)

another reason for the spike is the NOS which operates at a higher pressure actually hits the cyl first for a brief half second or so. this is why some of the big NOS users actually shorten the length of the lines from the solenoid outlet on the fuel side to the nozzle as opposed to the NOS side. this will minimize the lean spike. again it is all in the setup. Most dry systems are prone to this unless DFI, FAST, etc activated.

Wes
Chicago Z06 is offline   Reply With Quote
Reply


Tags
150, direct, ls1, nitrous, port, shot, tech, timing

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 03:41 AM.