Vortech YSI dyno results
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 3,150
Likes: 1
From: Carlsbad, CA CA
I am unsure but I want to say the fuel pressure was around 55psi? at around 10psi?
I will change all the filters including the little one off the tank.
Intermediate
Joined: Jul 2004
Posts: 38
Likes: 0
ouch... that hurts... It sounds like you're one to one fuel pressure regulator was working. You should be seeing more boost and hp #'s. It's almost like things signed off early. What about spark plug blowout? You should be making much more than that even with belt slippage if you're seeing approx 10 lbs of boost. It sounds like slippage but let's see if I can come up with some other ideas...
FWIW, shopview got 17 lbs of boost out of his lt1, even with slippage. That was around 700 rwhp.
FWIW, shopview got 17 lbs of boost out of his lt1, even with slippage. That was around 700 rwhp.
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 3,150
Likes: 1
From: Carlsbad, CA CA
The pic of the motor pretty much show everything but i will try to take a pic soon and post it here.
The only regulator being used is the one supplied with the MR.
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 3,150
Likes: 1
From: Carlsbad, CA CA
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Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 3,150
Likes: 1
From: Carlsbad, CA CA
Here is the picture showing the 8An feed to the MR fuel rail.
The feed line goes to the aeromotive filter mounted on the shroud then to the fuel rail. From the rail on everything is stock MR, including the FPR.
The return off the fuel rail goes to 6AN SS line all the way back but it is T'd off to a seperate aeromotive FPR for the nitrous.
The nitrous has not been used sinced the SC. Here is the return line and where it is T'd off to the regulator.
My current fuel system was designed and built by another mechanic whom I do not use any more. I never really understood it because the nitrous part always confused me but I think the nitrous is fed off an intank bosch pump thru the stock fuel lines then to aeromotive FPR, then to the fuel solenoid. I was told, the purpose of the FPR for the nitrous is to NOT allow the fuel pressure to rise becuase it will throw off the jetting on the nitrous.
Last edited by zelement; Jun 9, 2007 at 04:00 PM.
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
I see a bunch of good comments above.
A few that stand out as worth trying:
Fuel related:
1) the MRII fuel system is untouched.
If this is correct, then the L side injectors are getting fed with an ~-4AN line, as that is what the internal passages are sized, as well as the xfer port. This is an area that will need attention.
Aaron
A few that stand out as worth trying:
Fuel related:
1) the MRII fuel system is untouched.
If this is correct, then the L side injectors are getting fed with an ~-4AN line, as that is what the internal passages are sized, as well as the xfer port. This is an area that will need attention.
Aaron
Team Owner
Joined: Aug 1999
Posts: 24,017
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St. Jude Donor '10
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
I bet the MR fuel rail and pressure regulator design is the problem if its internally a -4AN size. One side is probably starving for fuel.....I split my feed line and feed both -10AN fuel rails using -6AN fuel lines and have an Aeromotive fuel pressure regulator controling the pressure..60lb injectors static at 58psi no boost reference 10psi of boost 640rwhp on my LS1 car...
I was surprised why they have a 1/4" holefeeding fuel thru the fuel rails. I carefully drilled mine out to 3/8". You can see the feed hole we are talking about if you pull the crossover tube out.
Racer
Joined: Dec 2005
Posts: 361
Likes: 0
From: Russia, Moscow
I too had problems with fuel MR. Them fuel rail for N/A, F/I It is required to modify, see my photos. Fuel rail C-figurative, one consists of two.
It is necessary to drill.
It is necessary to drill.
Last edited by divette; Jun 10, 2007 at 12:08 PM.
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
The fuel rails supplied by TPIS are supposed to support 500FWHP. The rail design supplied by TPIS has two transfer chambers. The fuel is fed through a -6AN line from the factory feed line at the L front of the engine. The gas is fed in through the back R fuel rail, then supplies the R bank injectors. The fuel then reverses through a seperate channel back to the rear of the R rail where it enters the transfer tube (look at the id of that 1/4" tube, also pull the -6AN adapter fitting and look inside the rails for the seperate channels, quite small). From the transfer tube it enters the L bank and feeds to the front of the L bank, then reverses to feed the injectors. After passing all injectors, the excess fuel exits the L rail at the AFPR (highly prone to diaphram failure). The AFPR then feeds through a -4AN line back down the R side of the engine to connect to the factory fuel return plumbing.
This design is hardly made to support 600+ WHP. When I was running the MRII on mine, I modded mine to feed both rails from the back and discharge both rails from the front with an external regulator. I have installed numerous MRs and have had probably the same number of supplied AFPRs fail.
You need to upgrade this set-up prior to dyno time.
Aaron
This design is hardly made to support 600+ WHP. When I was running the MRII on mine, I modded mine to feed both rails from the back and discharge both rails from the front with an external regulator. I have installed numerous MRs and have had probably the same number of supplied AFPRs fail.
You need to upgrade this set-up prior to dyno time.
Aaron
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 3,150
Likes: 1
From: Carlsbad, CA CA
I just got off the phone with Greg Caroll at blowerworks.
Greg was kind enough to spend 30 mins with me on the phone to explain what he thinks my problems could be.
Greg believes that it is NOT the miniram's fuel rail or the FPR that is at fault here. The problem he sees here are the multiple fuel filters being used here. I have three fuel filters; one before the pump, one just after, and another one up front near the fuel rail. All of these filters have never been changed or checked. Greg mentioned to start troubleshooting there first before doing anything else.
He also mentioned a simple test with the mighty vac and pumping up 10psi into the regulator at idle to see if the fuel pressure jumps accordingly.
The other problem with the drop in blower PSI is the possible restriction of the intake pipe. Greg also mentioned like many others, to do a test run with the filter and pipe off to see if the boost comes on.
I will look into these things in the next couple of days and let people know if my problems will be resloved.
I REALLY APPRECIATE EACH AND EVERYONE'S INPUT!
Paul
Last edited by zelement; Jun 11, 2007 at 05:41 PM.
