turboteggsr

OK i have the afformentioned kit running 15 degrees timing with 100 octane sunoco race gas on 7 psi. Have been running it this way for over two years and have had no problems. Car still compressions over 200 with less than a 10 point total spread and ran a 14.4 @ 100.1mph. On 7psi. I know i can run faster if i dyno tune the car. Car has lost no compression over two years and doesnt use any oil.

So i go to the dyno today cause i wanted to get a baseline and did 210hp and pulled 15:1 a/f ratios from 5grand to 8 grand and before 5 grand at like 1-3 psi i was at 10:1 and lower. Fuel pressure would hit 70 at 5 grand and then by 6 grand it was down to 60 and held it there. For some reason no one there could hear any pinging but obviously the piece of **** was. The fuel pressure seems to be too low.

My question is, is this normal for a drag kit and why the hell hasnt my motor blown up yet. I should have cracked a ring land by now. Does anyone have any ideas. I have a walboro 255hp pump and hks afr ready to be installed and another set of 240 injectors. I know that the stock injectors can support 7 psi because i saw in an import mag a gsr with the same turbo kit and the walboro 255hp pump, the inline pump with the kit, fmu and v-afc they tuned it to 11.5:1 a/f.

Any info would be appreciated.


Modified by turboteggsr at 4:25 AM 8/2/2003

Mr. Softee

i believe you need an inline pump

turboteggsr

I have one. It came with the turbo kit. I dont know if its an airtex or a bosch or how much it flows, its just the one that came with the kit. I checked the connections on the inline pump many times on the dyno and the connections were good. You can hear the pump prime.

turboteggsr

Also does anyone know what kind of fmu came with the drag gen 2 kit? Its not the classic blue of a vortech neither does it say vortech on it. Does anyone know the ratio of the disc in it? Would it be worth buying the vortech recalibration kit for a 12:1. Can an fmu fail causing the low fuel pressure i had today? I believe if its a 12:1 and i am running 7 psi, shouldnt it be adding 84 psi additional fuel pressure to the static 42psi? So a total of like 120 something?

turboteggsr

Anyone?

Mr. Softee

dude lol its 1am wait til tomroow.

Mr. Softee

which fmu do you have you should have more than 60 or 70psi of pressure with a 12:1 (what you nee dfor 240s)

turboteggsr

Thats what i dont know. The drag gen 2 kit never advertised what it was. I cant even tell if its a vortech or not. I mean it looks exactly like a vortech, identical but its not the classic blue and doesnt say vortech. When i have seen ads for the old gen 2 kit they called a drag fmu. I dont know if this helps at all. I cant be the only one here that runs the old drag gen 2 kit. I bought it from options 3 years ago.

Mr. Softee

illt ell you right now at 7psi with a 12:1 fmu (what you need) your fuel prssure should be at over 100psi.

sounds like if you are at 60-70psi @ 7psi ou have like a 4:1 fmu. That is not good- at all.

Mr. Softee

turboteggsr

Ok got the inline pump to work and its whiney and loud. Put 310cc injectors in to make sure the old injectors werent shot and still 60 psi fuel pressure. Checked the vaccuum source for the fmu and it pulled 21 in Hg at idle. Vortech said the vaccum source i am using is fine since its the line off the bottom of the manifold going to the stock fpr. The guy at vortech said that there is a vent hole on the bottom of the fmu that needs to be open to the atmosphere for the unit to work properly. This hole was being blocked by the mounting bracket so I moved the bracket uncovered the vent hole and still no luck. He said that since this hole had been plugged for nearly 3 years the piston inside could have failed. Has anyone hear had that problem? Although he was nice he really wouldnt say if vortech had had many problems with fmus failing. Has anyone here had one fail? I think i will try my buddies fmu and see what happens. If not what could it be? I have both the stock and inline pumps working and the new 310cc injectors. Any ideas would be a big help. Thanks

steve0z

14:7 is the magic number i believe

BoostedSi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by steve0z &raquo;</TD></TR><TR><TD CLASS="quote">14:7 is the magic number i believe</TD></TR></TABLE>

Should be close to 12:5:1 or lower with boost.

stierhund

I think it would be very hard for your FMU to just fail, but its possible that over 3 years it is bad.

Take your fuel lines and rail apart all the way back to the filter and check to see if something is slowing the fuel down. Actually first check your fuel filter... 3 years could do something to that also. If you have the money then get it metered w/the 310cc injectors and see what the A/F is... if its the same then I hope your FMU diaphram is low ratio. If it is then change it for a 12:1 piece.

turboteggsr

I called vortech and gave them the part number of the fmu and it was a 12:1. Also i measured the diameter of the washer inside the fmu and it was 2.72 inches which is the size of the 12:1 unit. Well tonight i put on my buddies fmu off his kit and still no luck. The fuel filter was replaced last year also. Also i had the check valves on the same vaccuum line as was the fmu. I moved the check valves to the other vaccuum source that the blowoff valve and boost gauge and avc-r are hooked on to and left only the fmu on the other vaccuum line that is originally connected to the stock fpr. STILL NO LUCK. My last option is i might not have the inline pump hooked up wrong. I was reading on import parts site that when you turn the key in the on position that the pump should prime for a few seconds and then shut off. Mine does not it continues to stay on. Will this affect the pumps performance while the car is running therefore not supporting the fmu with the fuel flow it needs to increase fuel pressure? Having the pump not shut off after a few seconds of turning the key to the on position makes a difference in the pumps performance? Is there a flow difference in when the pump primes and when it is actually running? Any ideas would be a big help cause i am runnin out of things to try. Thanks

turboteggsr

bump

turboteggsr

Could it be that the stock fpr is some how clogged?, reducing flow.

foamcows

do you have anyway to just try another FMU for a few hours?

turboteggsr

yeah i already did that and no luck

turboteggsr

OK so i tried my buddies stock fpr and still no luck. I have run out of things to try. New 310cc injectors, inine pump, checked the vaccuum source to the fmu, moved check valves to another vac source, tried different fmu. I think i will hook my boost gauge up to the vac source to the fmu and see if it reads positive pressure. I unhooked the vac line going to the fpr, therefore eliminating the fmu and fuel pressure was a constant 50psi whether wot or idle and whether boost or no boost. Hooked up the fpr vac line back up and the fuel pressure will go up to 50psi at wot and then when it hits 2psi of boost it will spike to 60psi and then it will just hit a brick wall and stop, and sometimes it will drop slightly maybe 2 psi. Does anyone have anyother ideas. The fuel filter is about a year or atmost 1.5 years old with about 10,000 miles on it. Does anyone please have any other ideas.
I really need some more thoughts. Thanks

Turboteggsr

turboteggsr

Also my fuel gauge is locater after the inline pump right before the fuel rail if this makes a difference. Is this the right place to read the fuel pressure. I heard you dont want to read the pressure at the filter if you have an inline pump, so after the pump and before the rail would be correct wouldnt it?

turboteggsr

Anyone?

swlabhot

Dude, don't waste anymore time and hair trying to get this to work. Get yourself an AFC, eliminate the POS FMU and run the hack....simple, clean and effective.

turboteggsr

I will at some point but it concerns me that my current setup is not working cause something is wrong other than the fmu or inline pump. So whose to say that i do the hack and there isnt some new problem that comes up. If youve read this whole post you will see that i have replaced everything except for the stock pump and all the fuel lines, although i have the whinebro on the way. I just feel if i cant get this figured out whats the point of doing the hack when its not an fmu problem.

turboteggsr

FINALLY GOT IT. Did the last thing to the car, i replaced the stock intank with my buddies walboro and i got plenty of fuel pressure. My walboro still hasnt come in yet but it should be here this week according to the shop i got it from. So this week i should be able to boost again.

Current fuel setup:
Bosch Inline pump
Walbro intank
12:1 fmu
Venom 310cc
HKS AFR

Oh yeah car runs really rich with the 310s and the 12:1 fmu my buddy who was following me said its pure black behind me when i get on it. So ill run this setup for awhile until i get enough money for some real fuel management.