FoHawk

iTrader: (3)

Hey guys, need some help from a few guru's is possible.

Im running out of fuel when I hit it with a big shot (the tuner explained that because I was not there during time of testing)

And the cold fusion kit im running is a little off on the correct pills for a optimum A/F ratio. So we've had to mix and match to get it to play nice, very inconvenient but doable...

So currently we have a .040 fuel jet in with a .065 nitrous jet. Which means we have a 225HP fuel pill and a 165HP nitrous pill.... This picked up 85rwhp on the dyno. NOT THRILLED at that.

Im no longer at the shop, but wanted to play around with adjusting the fuel jets to lean it out a bit. I cant go crazy without a A/F gauge but wanted to see if it was okay if I switched the 40 fuel pill for a 38 fuel pill and run it at the track. Tuner told me the nitrous tune was conservative and safe, so i imagine I would be okay, just wanted to check.

Thanks for any help.

03EBZ06

Something is wrong. Plug gap, timing or something. I would not run it yet. whats the plug look like? What is the fuel system setup.

BSmiff

Sounds like you have a fuel pump shortage or its going bad. Check both nitrous and fuel solenoids. Nobody runs pills like that in ANY nitrous system. You have some fuel issues.

FoHawk

iTrader: (3)

Well it runs good N/A, just has issues when I put the nitrous on it.

Gonna take it to cold fusion thursday.

zacht

iTrader: (18)

dang! whats in it for a fuel system? pump? hotwire?

FoHawk

iTrader: (3)

Stock pump and 72lb injectors.

But it was stock 340rwhp having these issues. Now with 465rwhp it has the same issues. Something is wrong....

zacht

iTrader: (18)

it was having 'fuel pressure drop' issues without the nitrous??? i would say do a pump/hotwire...

few months ago seen a bone stock ls1 dyno 260rwhp...(WTF!!!)...going lean...pump was bad...

shortdog

iTrader: (1)

Your problem is in bold. It can't keep up on the bottle. Install a racetronix pump kit or get a stand alone if you decide to spray bigger in the future.

Mzdb1

Put in a dual pump run a larger feed line and use your stock feed line as a return........

FoHawk

iTrader: (3)

The kit makes it run lean, it doesn't matter if its a 75 shot or a 150 shot, the jetting is off.

Its got the 225 fuel pill in now and the af ratio is perfect now. It had the 75 pills making 100rwhp because it was way lean, the fuel pump may be running out.....but the jetting is way off and that's what needs to be addressed first I'd think.

zacht

iTrader: (18)

i think thats possibly a little overkill...but if thats what it takes!!!

i would check the pump...and fuel pressure regulator....seen too many setups run bad, then change the pump and its a whole new animal...not to mention running nitrous on a bad pump is even worse!

vendor here sells a walbro 255lph for 110 bucks...cheap insurance if you ask me...and a hotwire kit for 65...or make one yourself for even cheaper...

http://www.sho-mespeed.com/index.php...ry_pathway=629

shortdog

iTrader: (1)

The a/f is "perfect" (which I doubt) due to the low psi drop from the pump most likely. For verification, put a fp gauge on the rail. Spray to see if the psi drops, then continues to drop, but don't stay in it long if it's dropping fast! It's normal for the psi to drop a little, but if it drops below 50psi and continues while on the spray, then there's your culprit.

Italianjoe1

I was gonna say, has anybody checked the fuel pressure? That would explain why you need a massive fuel jet to make it work.

Doesn't explain the lack of power though.

FoHawk

iTrader: (3)

The fuel pressure was checked during the first trials. And was at the correct psi. The pressure has not been checked since.

Going back to the first attempts we used a 100 pill for n2o and 150 pill for fuel and we got 65rwhp gained at the wheels with acceptable af ratio. Obviously this is screwed...

If its the fuel pump at this point then okay, but the nitrous numbers should of remained constant since day one.

Its a cold fusion kit designed for the ls2 ( i have an LS3 ) when ordering from CF they assured me it would not be an issue. So Thursday we'll find out. Hopefully it's something simple.

I just want a 100rwhp to be a 100rwhp with the correct jetting and no compensation for lack of fuel.

Mzdb1

You're probably right but I have learned one thing over the past few years from my dad-it's better to go bigger now, because you will want more later.

FoHawk

iTrader: (3)

Changing a fuel pump on a corvette is gonna run over 1, 000 $ easy.

Or a stand alone system for 7-800 $

Nitro Dave's Nitrous Outlet

iTrader: (25)

So this is in a corvette? What year?

FoHawk

iTrader: (3)

Dave,

2008 c6

zacht

iTrader: (18)

lol! true! im the same way!

oh man! i thought we were talking ws6 here...like your avatar pic!

Mzdb1

Is it not possible to do a twin setup using the factory bucket in a vett?