Big shot of spray on stock car

vanilla gorilla · #1 04-24-2009, 11:35 PM

So I want to make my GST fast, but cheaply and reliably. So spray seems the logical answer.

I already have a compucar wet kit that came off our camaro. Its jetted to 100 shot right now. The way its setup is the fuel supply is ran off the schrader (sp?) valve.

I have an banjo bolt with a fitting on top that Im going to put on the top of the fuel filter. I will run a line from there to the gas solenoid for fuel delivery. Will my stock fuel pump supply enough fuel? I was thinking I could drop in a 255lph pump. Would that be enough fuel to support the engine and nitrous?

OK, other than that. I know my engine can hold the power. But will I need any tuning? Running race gas on an otherwise stock setup. In my eyes it seems like I shouldnt need any additional tuning. On the camaro we are running the 100 wet shot with no tuning at all....no modifications or anything. Stock fuel pump too. I kno alot of people are running nitrous control through LINK, but for my particular application is that neccesry? If it knocks the engine is going to pull timing right?

What do you guys think? Let me know.

I mean, I'm trying to get out as cheap as possible. Thats the whole point of this build. Budget build up.

LandoAWD · #2 04-28-2009, 07:51 AM

YES, you will need to tune. Check out the Nitrous sub-forum on Tuners.

vanilla gorilla · #3 04-28-2009, 10:54 AM

I was reading on there but didnt find too much information useful. I will do some more reading.

cantgo2fast · #4 04-28-2009, 01:01 PM

Remember that your camaro's engine is almost 3 times the size of your eclipse and twice the cylinders. And because you cant change the mass flow rate of the nitrous nozzle (jet) your going to be putting in the same amount of nitrous for your 6liter into only 2.4liters so there will be almost 3x more nitrous per unit volume. I may be completely wrong (somebody correct me if i am) but thats why you need to tune with such large shots of nitrous.

Could he get away with a 50 shot with no tuning?

Edit: have you thought about a used 16G?

SilvrEclipse · #5 04-28-2009, 01:57 PM

This is going in his gst. 2.0l not the 2.4

steviek · #6 04-28-2009, 02:25 PM

I've never experimented about Nos but I would certainly like to know how much of a shot a stock motor can handle... I just don't want you to be the one to find out its limitations.

vanilla gorilla · #7 04-28-2009, 09:40 PM

For the money I got in the car, it would be nothing to scatter it on the track. It just kinda seems like a waste though.

The only mods I'm doing to the engine are head studs, and full maintanence and bs removal. There no doubt in my mind that I can spray 50 wet to it all day long. And I wouldnt be scared to jet it to 75. I just want to go big, since the kit can support alot more. And since its already jetted to 100... just seems like the thing to do. I guess I will just start with 50 jets, then 75 and see how it pulls.

But besides that. You guys think I need to upgrade the fuel pump?

vanilla gorilla · #8 04-28-2009, 09:51 PM

OK. I just thought about something else. My spyder (with a weak NA motor), can hold the 14b on 9 psi, with no tuning except some sorry excuse for a tune on a SAFC2. And all the AFC does is control fuel. With the big wet shot on the GST, I would need no control of fuel since fuel is injected along with the n2o.

Someone give me some input.

Black99GST · #9 05-01-2009, 12:24 AM

the spray is an oxidizer, so with any shot of nitrous, its going to lean out (correct me if im wrong) i would at least get a wideband in their, so you can maybe see the break coming before it actually breaks... no experience with any nitrous system though... just my

SilvrEclipse · #10 05-01-2009, 08:54 AM

You should be fine then. I have never used the stuff but Im assuming that the right amount of fuel is going to be injected. Stock 4g63's run stupid rich from the factory anyways so it should be fine. It would still be nice to have a WB hooked up for the first couple trys to see what it will do. Also at least rewire the stock pump. Im not sure whether it can supply enough fuel but if you still on stock boost then it may be fine just rewired. 190 pumps are pretty cheap so you may want to install one just to be safe.

vanilla gorilla · #11 05-01-2009, 11:53 PM

So you think a 190 would be all I need?

Other than that.....I havent done much engine managment crap before so....
With that big of a power adder I'm thinking it would be nice to have some kind of ignition control so I can retard timing to compensate for the additional power. I was looking at a msd box that I could use to do what I need to do. But its $200...then its like well if Im gone spend $200 for just ignition control...why dont I spend $600 for link (already have an eprom that im not using right now). Then its starts getting expensive....which defeats the whole purpose of the car...

I need more $$$. A local guy has a GSX that im probably going to do some work on here shortly....make some spare cake.

SilvrEclipse · #12 05-02-2009, 12:03 AM

a 190 should be plenty. Thats how it always starts. A few mods..then a few more... then more and more. You will have to pull some timing with at big of a shot. You could use an msd box but they are expensive. I would say go with link so you can tune the car and even fine tune the car when on the bottle. Sounds like the way to go, also do be to concerned about going cheap. It could cost you the motor

vanilla gorilla · #13 05-02-2009, 02:29 PM

Thanks for all the suggestions. I just get to thinking about stuff, and so many ideas are flowing at one time. What will start as a simple idea in my head will turn into a huge cluster F*** and gets confusing. Im going to get my clutch first, so I can put in my tranny. Then do engine maintenace. Then I will worry about power adders. Again thanks for the help guys, I will keep y'all updated on the project. I'm going outside right now to take some photos.

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