Could my stock injectors and pump handle spraying the 125 dry shot? I know the 98's had the slightly bigger injectors (28.8lb) and fuel pump.
Or should i just stick to the 100? I do have a timing tuner so that aspect i won't have to worry about.

If you've done it feel free to chime in.

thanks!!

 

i spray a 150 dry shot on my stock fuel pump. i have 42lb injectors though.... but my fuel pump is doing fine.

 

the fuel pump isnt going to be affected by a dry shot. when using a dry shot you need injectors. wet shot you need fuel pump. i would suggest getting bigger injectors and then spraying a 150

 

So is a dry 100 shot as big as i can go with 28.8 injectors?

 

i'm not sure, but i say do it an dsee what happens

 

I ran the 125 flywheel jets in my car with the stock injectors (28.8s) and pump, while it had only bolt-ons. It did just fine, and the a/f was safe.

Are you running a NOS 5177 kit? Nozzle placement makes a HUGE difference on starting a/f as well as sustained. Where do you have yours located?

Actually, what good would it do to have bigger injectors to feed the beast, if there isnt enough pump to feed the injectors?

When your gonna run a decent sized dry shot, or, for example, a dry kit on top of heads/cam, you will need larger injectors AND a fuel pump. I will say that the injectors will be the first thing to limit you, but after enough mods, you will need a pump as well.

 

^^ I've got the Harris speed works dry kit


Nozzle is the conduit wire on the left side running into the lid.

 

yeah thats what i meant that the injectors should be the first things changed on a dry shot

 

To be honest, that's one of the worst places to have the nozzle. Have you checked A/F on the spray? I would bet it has a NASTY lean spike on the hit, and never gets too safe, even by the end of the run. I would log a pass and see how it looks before you start running it that way.

 

What does the car make on the motor and have you sprayed a smaller shot yet? injector comes down to total hp so a stock car could take more hit for the injector over say a cammed car. the easy way is to put a mechanical Fp guage on it on the dyno to watch fp( to see if pump can hang) and watch AF. your tunner should be able to give you an idea of how much room you have by the duty cycle.

 

where is a better place?

 

anything over 125 ive heard it performs better with bigger injectors and bigger fuel rails & fuel pump...

 

You should have the nozzles spray pattern pointed directly at the maf.about 6-8" away. you can tune a/f slightly by moving it closer or farther away.

 

I have the same kit this is where i place the nozzle here are some pics

 

thanks for the pics^ i used the diagram that came with the kit from Harris. According to their diagram im right in the middle almost rich. But i don't know. I tried to get the picture up on here but i can't get it to work since its a .pdf

http://www.harrisspeedworks.com/inst...n%20Manual.pdf

not sure if that link will work but the diagram is on the 11th page

 

Use a 90*, in the neck, about 3-4 inches from the MAF.

 

I moved it last night, Its about 2.5 inches off of the opening of the lid. While the sensors are about another inch into the MAF, so total is 3.5 inches from the wire sensors(hope thats how i should have measured it). I searched pictures of nozzle locations and this was the most recommended location. I'll hopefully get a picture up in the next couple days.

Didn't get a chance to spray it yet, but as soon as i do i'll let you know how she does...might be going to the track tonight

thanks for the good info fellas

 

theres no exact measuement. get an af reading and if its lean move it closer to the maf. if its rich move it farther away. you can also adjust the angle to either hit the sensors more to richen it up or less to lean it out.

 

[QUOTE=BriancWS6]I ran the 125 flywheel jets in my car with the stock injectors (28.8s) and pump, while it had only bolt-ons. It did just fine, and the a/f was safe.

I found out my 125 shot is hp at the wheels, do you think i could still spray it?

 

Correct amundo, and dual nozzles are better than single. Why, cause at this distance you will likely start out rich, you then rotate one nozzle to miss, or partialy miss the wire with the spray and thus adjusting a/f. Also, duals or singles should go in the neck. You can also turn one of your 90* nozzles back into the air stream. On mine, i have one 90* and one straight shooter (goes back into the air box, and a/f is 11.5:1 across the board and no lean spike what so ever. Now when my 2nd stage kicks in, two more staright shooters into the center of CAI, allows the a/f to go richer. This can also be fine tuned by changing out the size of the jets in the 1st stage nozzles, meaning a bigger jet in the 90* nozzle starts a richer mix compared to the 11.5:1 I have currently. You can see my dual nozzles and quad nozzles in my web sites in sig. it's A Z06, but neck is realative to MAF, so same as the F-bods.

The math for sizing injectors is in the wet vs dry thread.
Robert