Just got back from the track

98LSC32V

98LSC32V

Dedicated LVC Member
Joined
Apr 17, 2005
Messages
3,225
Reaction score
9
Location
Bay Area
Very frustrating night at the track. The first run I was so nervous I hit the bottle heater switch instead of the nitrous and it ran a 14.3 on motor on the nitrous tune. Second run was even worse on the nitrous. I hit it in 1st gear right after 3000rpm and it bogged down HARD when it hit. I coasted to the finish line. It felt like it only sprayed fuel and no nitrous. Parked the car, rechecked all the solinoids, everything looked fine. Remember I tested it a few hours earlier and it worked fine. I think to myself it must be too much fuel with the nitrous tune plus the 125 fuel jets on the 100 nitrous jet. I put the 100 fuel jet in and take it for a test run in the back of the track where they usually run autocross. It hits hard in 1st, shifts right at 6500rpm and it continues to pull like a freight train in 2nd gear. So i'm happy until it's time to run again. This time when the nitrous kicks in it feels OK but in the upper rpm's it begins to break up so I let off again and coast. Frustrated, I decide im done messing around with the nitrous for the night and upload the NA tune. The track was not hooking hard so with a 2.1 60 foot time I hit a 14.1 and back that up with a 14.21 and then I redlight in the 2nd round -.002.
Tomorrow im gonna check the NGK TR6 plugs which I gapped at .040. Any other ideas as to what's going on? I guess im gonna have to put this thing on the dyno when I have the money...
 
Your spark plug gap is too big ,gap them down to .035
 
A .040 gap too big for a 100 shot? I honestly don't think that's the issue but I will check the plugs tomorrow...
 
Dont think it the plug gap causing this. Mine are set at .036 but have run with a much larger gap with no issues. I still use stock coils. Any chance did you try and adjust the time or fuel manually in your tune. That made mine feel like it was surging at the top end. What did your plugs look like.
 
I would be very scared to run the spray if it bogs when first used. Not good with a wet system, that has never happened. hopfully it was wiring issue like the gas didnt spray only fuel still not good.
 
98CobraStarLSC said:
This time when the nitrous kicks in it feels OK but in the upper rpm's it begins to break up so I let off again and coast.
Click to expand...

At different loads your car has differnet fuel volume requirements.
First gear loads wont be as high as second and third in the upper R's.

This is "grabbing a straw" but remember what I said about wet kits that hook to the schrader?
This might be what your seeing.

A partial hit feels good, but when you "go for the gusto" it breaks up.

I "think" your gap is probably ok, abliet on the edge of too wide.
pinch em off .05 down to .035 like 95SC suggested, if that doesnt fix the problem, then it's gonna be fuel related...IMHO.

Also, as I suggested, you might consider putting your fuel table back to stock, which will be "very rich".. but "fat is safe".. you want to be on the safe side.

how "low" of a shot can you run with it?
For instance.. could you without too much trouble make it a 50 shot dry?
and see if the car breaks up like it did before.

you should be able to spray 100 shot DRY on a stock fuel table with NO CONCERNS.
I'd try that.. see if you can get the dry end of it to be "OK"...
That'll tell you if the "kit is sucking the fuel rail dry late in the run".

just thinking, as I'm typing.

When I sprayed my stang, the "test hits" always felt good.

Then when I went for a "full pull" there always seemed to be something goofy happening until I went with a dedicated "fuel system" for the kit.

(seperate 2 gallon tank, with pump to feed the fuel soleniod")
fixed all the goofyness.
 
htrdlincoln98 said:
I still use stock coils..
Click to expand...

which should be perfectly fine.

One thing is for sure.. spraying a car WILL seek out and find the weak points in your ignition and fuel system.

Serge aint gonna wanna hear my next idea....lol
REPLACE those GMS coils with some known good stockers and see if the ignition breaks up..

need to find out if this is spark or fuel related.

USUALLY "breaking up" is spark..and "boggin" is fuel, unless the nitrous side "didn't fire" like htrd said.
 
1. The bottle pressure was not the issue, I have a bottle heater so it was around 1000psi all night.
2. I have the stock coils in the car, I only have the GMS connector kit which is the wires inside the coils and the silicone boots.
3. I have a feeling it has something to do with the Sniper nitrous tune but I can't run the sniper tune with stock fuel and timing and just tranny settings and rev limiter changed. I didn't do any fine tuning of the spark or fuel just set it to the base Sniper 100 shot wet nitrous tune which is supposed to retard timing at WOT 3 degrees and make the A/F richer. I can put the car back to 100% stock tune to test it out but i'm afraid it will hit the rev limiter.
4. I have the jets for a 75 shot right now... thinking about putting that in, putting stock tune in and regapping the plugs and to test it out again. If that doesn't work, i'm gonna have to hold off on using the nitrous until I get a fuel pressure gauge and get it on the dyno.
 
htrdlincoln98 said:
I would be very scared to run the spray if it bogs when first used. Not good with a wet system, that has never happened. hopfully it was wiring issue like the gas didnt spray only fuel still not good.
Click to expand...

Well it didn't bog when I put the 100 fuel jet in, it broke up in the upper rpms. So it went from what seemed like too much fuel to not enough fuel or spark... weird.
 
Yes wierd, still sounds like the nitrous didn;t fire when bogged and now you maybe finding the limites to the fuel system. Still wierd I would have thought the wet kit would be a no brainer on our cars. Have you done any data logs on the nitrous or with the nitrous tune. What about fuel trim readings?
 
Haven't done any datalogging because my laptop battery is dead, it only works when plugged into an outlet. I think it very well maybe the SVT focus fuel pump. When I started the car this morning I listened to the pump whine, you know how a 255lph pump has a distinct sound especially when starting cold? Well it almost seemed like that noise was cutting in and out... not sure what that means but probably not good. I really need to get a fuel pressure gauge. You know I thought since it was running good NA that the pump was just fine but now that I think about it I could never figure out why it would do 78-79mph in the 1/8th mile but only 97mph on the top end. Even a stock Mark VIII picks up 20mph between the 1/8th and the 1/4 mile...
 
You may be on to somthing there. I cannt remember any sound difference when I installed the 255 pump in mine. Its the one super coupe sells. Also got a second in line 255 wallbro sitting around never installed, decided to go the intank way. Two would be better than one right?
 
Hey do you have the timeslip for your 13.8 at 99mph run? I'd be curious to see what it did in the 1/8th mile! And next time you are starting the car cold, stand by the passender side rear tire and listen to the pump. You should hear the 255lph pump whine... btw if you got the 255lph pump that Super Coupe sells for the gen 2 that is an SVT Focus pump...
 
98LSC32V said:
Hey do you have the timeslip for your 13.8 at 99mph run? I'd be curious to see what it did in the 1/8th mile! And next time you are starting the car cold, stand by the passender side rear tire and listen to the pump. You should hear the 255lph pump whine... btw if you got the 255lph pump that Super Coupe sells for the gen 2 that is an SVT Focus pump...
Click to expand...


http://www.lincolnvscadillac.com/showthread.php?t=48006
 
Just like I thought, he got a 79mph in the 1/8th and 99mph in the 1/4... I get 79mph in the 1/8th and 97mph in the 1/4 mile... fuel pump??
 
You are playing a silly guessing game... it doesn't matter how the fuel pump sounds, it matters what PSI is in the rail.... Get a gauge and test it for real, data data data....
 
kustomizingkid said:
You are playing a silly guessing game... it doesn't matter how the fuel pump sounds, it matters what PSI is in the rail.... Get a gauge and test it for real, data data data....
Click to expand...

I already said I was planning on doing that, but for now I don't have one. It's not gonna magically appear on my doorstep so i'm trying to discuss the data I have... which are NA timeslips compared to cars with similar mods.
 
On the bright side, on my last run of the night when I redlit I went all out and decided to test out once and for all wether or not I still had a speed limiter. I took it over 110+ and it was pulling hard, no top speed limiter just like I thought. So I don't know why the tune that I sent to htrdlincoln didn't work for him, it works good for me...
 
Honestly i'm so frustrated right now i'm thinking about selling the car and buying a cheap Honda...
 
98LSC32V said:
Honestly i'm so frustrated right now i'm thinking about selling the car and buying a cheap Honda...
Click to expand...
LOL don't do that!

Stack said:
(KK)Brandon... such a data nazi!:p
Click to expand...

Well hes right you have to take the guessing out and work with facts to get anywere.
Part of the frustration is being short on facts.

I hate guessing worse then trying to do a job without the proper tool.
The frustration factor can go thru the roof! :mad:
 
If you jump into things without proper planning and data, well just expect them to always go wrong...
 
I did the proper research and planning on it before I ran it. Just because I don't have a wideband a/f gauge hooked up doesn't mean I didn't do the research and don't know what i'm doing.
 
You must log in or register to reply here.

Members online

No members online now.
Total: 1,134 (members: 0, guests: 1,134)
Back
Top