74u

iTrader: (9)

I recently purchased a 99ss M6. The car has a partially installed NOS 5177 dry kit on it. I would like to finish the install with a WOT switch, FPSS, and Mallory window switch I have laying. The goal would be to use a remote bottle valve and pretty much have a ZERO MAINTENANCE kit activated 100% of the time while the car is in use so its always ready when I need it I would like to keep the jetting around 75hp so I can get plenty of life out of the bottle. I have a couple questions...but first here are some notes on the build...

TSP LS2 402 stroker (Eagle crank, Eagle H-beams, Diamond dished pistons) ~ 10.9:1scr
Patriot Stage 3's
244/248 112lsa - .620 lift with Comp Pro Mag 1.85's (starts floating about 6500)
Fast 92 ported to approx. 95mm, 95mm TB, 100mm MAF

FAST 36lb injectors (41lb when ran at 58psi)
Stock fuel pump, lines, rails, regulator

NA tune yielded 471whp @6200rpm per the tuner (Mike Norris)


OK...with all that in mind...

A) Do you think my injectors can handle the additional 75hp dry kit?
B) How about the stock fuel pump?
C) What about my tune/plugs? I really don't want to give anything up NA...I'd rather keep the shot small enough that I don't have to water down the tune...


I know...a hell of a lot of reading for a little 75hp shot, but please humor me

HCI2000SS

iTrader: (2)

A) Not sure about those 36lb injectors since it's a dry kit
B) I'm thinking that stock fuel pump will be very maxed out
C) What plugs do you have now, and what are they gapped at?

74u

iTrader: (9)

So what size injector would be needed in your opinion?

As for pump I was already eyeing one of those Racetronix kits for $150 and a hotwire kit...I assume this would be adequate?

I think I have TR55's but I need to check. I know the gap would need to be closed to .035'ish on whatever plug I use...doubt that would change anything while NA anyways.

HCI2000SS

iTrader: (2)

Yeah I run a Racetronix kit (255 Walbro and hotwire kit) and it does fine for me at around 550 rwhp on the 100 shot. I run 42lb injectors but i'm running a wet kit, so I would go with at least that. If the TR55's are working for you now with no issues then you will "probably" be okay lol, but i'd rather see something at least like a TR6.

74u

iTrader: (9)

Small update...I pulled a plug and they are AC Delco 12.

I'm not familiar with this plug. Is it appropriate for my HCI 402 set up N/A, or on the 75 shot?

They look like they are due to be replaced...anybody know what the NGK equivalent would be? My searching makes me suspect it may cross with the NGK BP5ES but I couldn't find a good chart. Can anybody comfirm?

zracer323

iTrader: (12)

Get some NGK br7ef's. They are a non projected tip and are good for nitrous

Sent from my iPhone using IB AutoGroup

NOS LS1

iTrader: (3)

A. Your injectors should be fine with Fuel Pressure at 58 psi.

B. For sure upgrade your fuel pump & wiring harness... http://www.ebay.com/itm/like/380797162094?lpid=82
C. You can run Full timing on the street & pull timing as soon as you power up or arm your nitrous system with the Lingenfelter LNC 2000 Timing computer.

They say the LNC 2000 is the best timing computer for LS engines because it comes with a plug & play harness for ease of installation. ( Adjustable depending on your shot of N20).

D. It would also be a good idea to run a Lingenfelter window switch to turn your nitrous ON at 3000 rpm & OFF at 6000 rpm so your factory Fuel Cutoff / Rev Limiter does not cause a lean condition by cutting off fuel pressure at 6200 rpm while you are injection nitrous into your motor. Ka-Boom !

Omega Doom

iTrader: (2)

whos tuning the car?

macca_779

This is how I'm wiring up my dry shot. I Tune my own stuff and the PCM will handle the timing and extra fuel when pulling the trigger.

unioncarpenter84

iTrader: (22)

How are u using a fuel pressure safety switch with a dry kit??


And ur injectors are fine my 28lb factory are gunna be fine up to 100 on a dry kit

N2RACINGLS1's

iTrader: (2)

You use the FPSS the same way as you do on a wet kit. It is installed on the fuel rail and it shuts the nitrous off if fuel pressure drops too low.

Are U sure that your injectors are OK?

For the OP - I would think your current injector duty cycle is close now NA since you have a 402 CI engine and it appears to be moving a lot of air through it. Not sure about the valve float.

I am currently running bigger injectors on 346 CI engine.

I think the fuel pump upgrade is needed right away.

I hope this helps!

N2

macca_779

For a dry shot you need ~6% more fuel per 50hp

74u

iTrader: (9)

I wish I knew. Any suggestions?

74u

iTrader: (9)

I'm agree my pump has got to be close to maxed. As for the injectors, I guess I need to figure out how to use the AutoTap and LS1 EDIT that came with the car...figure out what the DC is right now.