You sure everything is put together & wired right?

What bottle Wt & pressure?

 

Also, what timing, plugs, n/a vs on the hose.

Need some more info on the tune.

 

Did you put a dry or wet system on? More info on what you did will help.

 

Wet Fogger system. 39 degrees ignition with 8 degree retard on the gas. Champion C61Cx.
Yes, it's wired right and works. Full bottle and 950 pressure on the gas and 5 psi fuelpressure as recommended from NX E85 jetting chart.

Thanks Guys, help needed here!!

Roadkill Trucking/C-10 Racing

 

Engine is an old track motor from 1990. Built by Prototype Racing = Ron Neal.
Callies crank, titanium rods and most of the bells and whistles. Pontiac heads ported by H.V.H. with 240cc runners and 2.10 intakes. The cam is still the track version with not much happening over 7000. A new roller is in process...
Running an MSD distributor and MSD 6 Digital with high voltage coil.
Mechanical Hilborn with 12" stacks. It runs O.K. until we turn the NOS on and sounded like loosing cylinders on the last run Saturday. AFR reading approx. 8 across the line. Is there too much E85 and NOS so the plugs can't handle it?

Roadkill Trucking/C-10 Racing

 

If your “loosing cylinders”, look at the whole ignition & fuel system, and make sure everything is right. Maybe get a new coil before pulling your hair out too much.

Your tune doesn’t look bad.

If your AFR is reading 8, I don’t think it’s flooding the motor out like you state, but what do the plugs look like?

If the plugs look ok (safe), add a little more timing in, and see if it picks up.

I pulled 10* at first on a 150 shot. And the car didn’t go for shit, went from a 12.08 on motor to a 11.80. I changed it to pull 5*, and it picked up almost a second (in sig).

My car does just what your describing here when the bottle is empty… runs like it’s on motor. Put the bottle on a scale, and make sure it is at least 19-20#, min. you can have 1000 psi on a half full bottle (ask me how I know)

I am not sure about champion plugs. But I’ve always had good luck contacting NGK directly for spark plug recommendations. They are usually within a heat range for whatever we’re doing. You can contact them here: http://www.ngksparkplugs.com/About_nGK/formtech.asp
Close up the plug gap on the bottle, too. I run .040 on motor and .025 on spray.

Is this a converter or clutch car? If you rule out the ignition, it may be simply pushing right through the converter.

good luck with it... my little 350 was a dirt track motor in another life, so I know yours will run like a scalded dog

 

Thanks for the input Big Ricky3. The coil should be O.K. as it's all new MSD stuff.
Plugs are way safe and wet.. after a NOS run. The E stuff burns so slow that I guess with 8* it's burning in the primary pipes instead of the heads.
I'm thinking of changing places with the jets just to check what happens to the AFR reading. Will try with 6* retard and 39* ground setting.
Bottle was definitely full during the 2 runs we made but we kept the pressure at recommended level. Just for once being careful...and following instructions...and Nothing happened..so much for that!
The C61Cx plugs we use are recommended for the heads but probably for high octane racefuel. I've also always used NGK with good results in the other engines we've been running.
We're running a PG with 1.80 first. The converter is a TCI and might be a little too weak for the truck. Total weight 1317Kgs with driver, 10.21 212km/h n/a

Will get back to you after the next race!

Thank You

Roadkill Trucking/C-10 Racing

 

Plugs are way safe and wet.. after a NOS run.

Roadkill Trucking/C-10 Racing

If the plugs are wet, your way fat. Is it like that on motor, too? Way fat tunes kill power.

There are 2 schools of thought with e85, fat with a lot of timing, or lean with "gas" timing. I do the later. Don't try to mix, or you'll get in trouble.

Id pull a little fuel out, until the plugs dry out, then add a little timing. That hilborn setup should actualy be jetted more like its on gas than meth.

 

2900 lbs / 132 mph
We're Metric....

 

Wait a min, your running a wet nitrous system?
So at some point your using a solenoid to lean out your main mechanical injection system?
If not you are way too fat and that would result in a lazy slug.

 

Yes, we're using a solenoid both for transportation and start rpm. On a run w/o NOS we average 9 AFR over the line.

Roadkill Trucking/C-10 Racing

 

2 questions,,
1st did you check to make sure you have E85 as I know from exoerience what you get from the pump or in a drum can vary from E70-E90.
2nd does it break up or miss under full load or just doesn't have any balls? .

also 9.0 w/o spray is lean for E85 http://ethanolpro.tripod.com/id213.html

 

Hi Uncle Paul,
No, we're running regular pump E85 so we have no control of the variations. Different track, different gasstation...
No missfiring, just no balls...and loosing fire on some cylinders close to the finishline.
We have actually richened the highend as we started out around 9,5 with plugs still looking safe.

Roadkill Trucking/C-10 Racing

 

Ok 1st you absolutely need to have one of these http://www.summitracing.com/parts/qft-36-e85/overview/
if not your flying blind and wil chase your tail.
2nd close the gap down on your plugs to 0.02-0.025"

 

I would make sure your ignition system is up to the task, 7AL3 box and the 2 amp HVC coil, with good wires, otherwise you might want to put in a Magneto and have that spark!

 

Will get one of those ASAP Uncle!
It's hard to close the gap on the C-Cx plugs as they have a very short electrode.

Thanks

Roadkill Trucking/C-10 Racing

 

Are you using the gas scale on the a-f meter? Can you read lambda? Mine is happy in the .8 lambda range, with a bunch of timing out.

 

If its missing your AFRs might not be correct. Misfires will cause a wideband to read leaner than what it really is. If you say plugs are wet after trying to spray it than I would say its most likely going super fat with misfires.
You might not be getting nitrous. You might have already check but im just throwing it out there. Ethanol aint like gas. It will drive thru super rich conditions.

My personal junk. N/A runs .80 lambda. On 160 shot runs .75 lambda with 5 deg. pulled. Maybe a tad rich but runs fucking good.

 

My guess is your cam is not NOS friendly. Prob has a lobe centerline of 106 or less.

 

have you checked to make sure nitrous is coming threw you solenoid when activated?

 

Trade in your champs for NGK -9 or -10 heat range plugs

 

if your a wet system you need a seperate electric pump . pulling fuel off will lower psi to nozzles .
the mech. pump was for methanol than it may be too big for e85 .you need to flow ck .the pump and system before you start messing with n2o.
i have run the electric by pass on motor and then added the right dry/n2o to match the bypass off the timing was controlled by normally closed relay contact . when system is armed

 

O.K. Been a couple of hectic days checking everything out and following different thoughts: All systems work as they are supposed to, full bottle, ignition O.K. Fuel pressure O.K. to NOS system. Everything checked but not been able to make a run yet. Must be overfeeding... Will change plugs and change the cam to a CompCam made for this engine... Have a feeling that this short track cam is not doing us any good right now.
The Lambda reading is another Q that we'll have to straighten out. We have absolutely no back or missfiring and the equipment has been checked on a gas car and then switched over to E85.

The work continues;o) Thanks for the input so far guys!!

Roadkill Trucking/C-10 Racing