How Accurate are electric fuel pressure gauges? (Nitrous related)
05-07-2007, 05:31 PM
#1
TECH Apprentice
Thread Starter
iTrader: (5)
Join Date: Apr 2004
Location: San Diego, Ca
Posts: 399
Likes: 0
Received 0 Likes
on
0 Posts
How Accurate are electric fuel pressure gauges? (Nitrous related) Are these pretty accurate? I am running a 100 wet shot and when the nitrous kicks in, the gauge goes to 40psi for a split second, then went back to 60. I have a Walbro 255L in now and show 61psi at the rails.
Is it time for an inline fuel pump?
Thanks,
Jason
Is it time for an inline fuel pump?
Thanks,
Jason
05-07-2007, 06:59 PM
#2
LS1TECH Sponsor
iTrader: (13)
Join Date: Jul 2004
Location: Massachusetts
Posts: 1,766
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Blown Interceptor
Are these pretty accurate? I am running a 100 wet shot and when the nitrous kicks in, the gauge goes to 40psi for a split second, then went back to 60. I have a Walbro 255L in now and show 61psi at the rails.
Is it time for an inline fuel pump?
Thanks,
Jason
Is it time for an inline fuel pump?
Thanks,
Jason
Dean
05-07-2007, 07:16 PM
#3
TECH Apprentice
Thread Starter
iTrader: (5)
Join Date: Apr 2004
Location: San Diego, Ca
Posts: 399
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DynotuneN2O
How accurate totally depends on the gauge,. If its a Dynotune fuel pressure gauge it is accurate to .1 PSI.
Dean
Dean
Well, unfortunately is not. It is an autometer fuel gauge. One of the older models no less.
05-07-2007, 09:19 PM
#4
TECH Apprentice
Thread Starter
iTrader: (5)
Join Date: Apr 2004
Location: San Diego, Ca
Posts: 399
Likes: 0
Received 0 Likes
on
0 Posts
I forgot to mention that when I hold the rpm's at 3500, then nail and the nitrous comes on...there is no problem. On the other hand, when I am in 3rd(lets say) and I let the rpm's rise, thats when I get detonation and fuel lose. That make sense...it's hard to explain...
Trending Topics
05-07-2007, 10:09 PM
#8
TECH Apprentice
Thread Starter
iTrader: (5)
Join Date: Apr 2004
Location: San Diego, Ca
Posts: 399
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by oange ss
the wiring would help, but probably wont cure it...i have a RaceTronix pump, 62 psi@idle...56 psi@ WOT/NA....53 psi@ WOT/ 100 wet shot...
I know I should not need a dual pump setup. At WOT/NA my pressure only to 58 psi, no lower.
You think my injectors have anything to do with this?
05-08-2007, 06:01 AM
#9
Banned
iTrader: (32)
Join Date: Mar 2005
Location: Fountain Inn, SC
Posts: 1,157
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by oange ss
the wiring would help, but probably wont cure it...i have a RaceTronix pump, 62 psi@idle...56 psi@ WOT/NA....53 psi@ WOT/ 100 wet shot...
05-08-2007, 06:30 AM
#10
TECH Fanatic
iTrader: (1)
Join Date: Mar 2004
Location: Southern NH
Posts: 1,644
Likes: 0
Received 0 Likes
on
0 Posts
Like Orange SS already said, its a inherent problem with a return-less fuel systems.
A fuel pump might help a little, but when your nitrous clicks on it draws a lot of fuel instantly on top of being at WOT. This will give you a quick drop in pressure until the regulator in your gas tank notices and corrects for it. The short answer is no matter how good your pump is a retuenless system will always have a quick drop, then as long as the pump is stong it will recover.
The best solution is a stand-alone fuel system for the nitrous, which is why Dave designed one specificly for these cars.
A fuel pump might help a little, but when your nitrous clicks on it draws a lot of fuel instantly on top of being at WOT. This will give you a quick drop in pressure until the regulator in your gas tank notices and corrects for it. The short answer is no matter how good your pump is a retuenless system will always have a quick drop, then as long as the pump is stong it will recover.
The best solution is a stand-alone fuel system for the nitrous, which is why Dave designed one specificly for these cars.
