Jaared

i want to add like a 30 shot to my setup.. from what i have read i will get 50hp from this.

my question is about the boost it creates... with a crazy ported wg (s4) with bigger flapper door will the boost go over 12 or so?

my mods will only support 12 peak right now... iv got my MBC set to 9lbs~10lbs.

id just like to have an idea before i waste my money

scathcart

What size in mm is the wastegate?

For what purpose(s) will you be using the nitrous?

Jaared

btw my car is up to par and running good... just a tad rich up top.

umm the wg has not been ported yet. so the size of the port is up in the air. what mm is target size?

umm id say for nights at the track and street races from time to time.. (i dont like the street race scene tho)...

i say now that it wont be used all the time... but odds are i will use it more often then i should. I guess that why i want to know what mod level i need to be at to support the nitrous.

im gonna rock the stock tubo till my buddy sells me his hybrid... so until then id like to have a tad more acceleration.

scathcart

30mm+ and you should be fine with a 30 shot.

(By what conditions, I meant gears/load/rpm, specifically)

Jaared

well i got the turbo in... the WG is HUGE... with no boost controll the boost does not go over 5psi. Im now thinking about a 50 shot. My "goal" is to make 275hp or so on this turbo, and 325whp with nos.

The turbo i have can reach my HP goal without nos but i really dont want to have to run 16 or 17 psi to do it.

I was planning on getting a rpm window switch, spray from like 4.5k till 6.5k. Im going for a safe setup so Id rather not hit it too early or hold it too late.

i doubt ill use it in 1st... 2nd and 3rd... yes.
and using it in 4th would mean i was doing like 120mph when it started to spray. No thank you.

Jaared

southcart any input would be great.. i know your the nos master.

scathcart

sorry man, been really busy with work/ shop stuff right now; just finished installing a 575V 3-phase air compressor.

If you have the fuel for it, go for it. Retard the timing map 3 or so degrees under nitrous injection.
I would increase that window from 3000 to 7400 if I were you, especially if you plan on using it in the lower gears. Use the nitrous to spool that turbo.

Jaared

till 7400... hmm

Is there any danger of letting off the gas while its spraying... i know you run a WOT switch. I dont have much knowladge of the dangers.. I didnt know if i had to all or nothing. I mean if i lose traction, see a cop, have to sneese, ect.. can i let off the gas while spraying?

Should i get a FPR? I already have a walbro pump.

The extra fuel and cooling effect for the spray will help out with the extra psi or two. I did plan on timing issues, that brings up 2 more questions then i think im good.

1. do they make a msd retard that works with the ignition on out cars and will i need two of them? Maybe i can just retard the timing at the cas 3deg...

2. I have read and read about nos and boost creep... Realistically what kind of creep should i see in 2nd and 3rd gear. My WG is as big as a s4 wg can be. The flapper door cant be any bigger... and it JUST barley covers the hole. It was ported 3 different times.

scathcart

The wot switch cuts the system the instant you let off complete WOT. You can't run an engine solely on Nitrous Oxide and fuel, which would occur if you let off the gas and nitrous was still injecting. If you wire the WOT switch and install it properly, it will just cut the nitrous.

As a sidenote, I have wired otherwise for very special circumstances (IE: controllers, etc)

Should i get a FPR? I already have a walbro pump.
Up to you. Not really required.

1. do they make a msd retard that works with the ignition on out cars and will i need two of them? Maybe i can just retard the timing at the cas 3deg...
Yes, the MSD retard boxes work, but you'd need 3 of them (o0ne leading, two trailing). You can also use a CDI unit on the leading with a built in retard and a DIS CDI on the tralings with built-in retard.

2. I have read and read about nos and boost creep... Realistically what kind of creep should i see in 2nd and 3rd gear. My WG is as big as a s4 wg can be. The flapper door cant be any bigger... and it JUST barley covers the hole. It was ported 3 different times.
You will see significant creep in 3rd by my experience. You need at least a new flapper door welded on.

Jaared

i do have a bigger door... as big as can be. the hole is as big as can be. With no controller the boost will not go over 5psi... i tried... cold night..all gears.. just wont do it.

Jaared

ok one more then ill leave you alone.. lol and this might be one for others to thinka bout too.

ok my last dyno sheet shows that im using all but 3% of my injectors from 5.5 to 7.5. 3% is where i ended up setting my safc to get 11.5:1...

The extra pound or so, and the extra hp made my all this will need more fuel then i have right now. Would the correct selection of fuel jets on the nos kit allow for the extra fuel needed? Extra fuel not only for the nos hp but for the extra psi or so ill endup running.

Seeing that i can change out the jets it seems like i should be able to tune it like i can with bigger injectors and a controller... but with jet size alone.

I remember reading something about tuning the nos... somethin about running a small shot to tune and then step it up..

Once i get all the parts it would be awsom if i could get any advice you have on tuning... where to start and when to say when.

Thanks again.