I guess maybe I was expecting wiplash or something, because I just wasn't all that impressed. I'm running a mid to high 13 N/A, so I decided a 75hp shot would do it for me right now. I could feel it kick in, but it just wasn't what I expected. Where my expectations to high, or should I just wait for the numbers to tell the tail?

------------------
"Why StockBastard?" you might ask. Well...
84 Berlinetta body w/custom paint.
92 front/rear bumper and ground affects.
89 IROC 350tpi engine w/lots of mods.
87 3.73 BW possi rear w/disk brakes.
86 interior w/IROC dash.
And finally, stock Vet rims from the early 70s.(same ones used on the 69ss)
ALL IN ONE CAR!!!
13.9@98.7
soon to be juicin'
hopin' for 12s

 

I don't know what kit you are running and what accesories you have for it so I will just take pot shots.

Do you ave a nitrous pressure guage?
If bottle pressure was low it would make for a very poor hit. Most nitrous kits are indeed jetted a little on the rich side (some are very rich). Even when running stock fuel pressures (43-47 PSI) and with the right bottle pressures (950-1050 PSI) they run rich. Running rich makes for a soft hit. If fuel pressure is too high or nitrous pressure is to low it will be even more rich.

On the other side, if the bottle pressure is too high, over 1100 PSI or so, (easy to be that way on some of these hot days) then the nitrous in the bottle is not a liquid any more but is a vapor. When this happens less nitrous is injected into the intake and the mix is again too rich and it hits week.

I don't know what kind of traction your getting but you didn't say if it would spin the tires or not when you hit the juice. If you are running street tires you might be blowing the tires (spinning) and all your acceleration maybe going up in smoke.

A 75 HP shot should be making around 100 to 150 pound/feet of torque at low RPM. That is enough to feal good if it really is hitting like it should be and if you are getting good traction.

 

my kit does have a pressure regulator.

The bottle its full.

I hit it in second, no spinning.

my car does spin through first without NOS, so I can't use it in that gear anyway.

Bottle might have been to hot. It was in the car all afternoon.

------------------
"Why StockBastard?" you might ask. Well...
84 Berlinetta body w/custom paint.
92 front/rear bumper and ground affects.
89 IROC 350tpi engine w/lots of mods.
87 3.73 BW possi rear w/disk brakes.
86 interior w/IROC dash.
And finally, stock Vet rims from the early 70s.(same ones used on the 69ss)
ALL IN ONE CAR!!!
13.9@98.7
soon to be juicin'
hopin' for 12s

 

peice of trask computer posted twice

[This message has been edited by StockBastard (edited August 28, 2001).]

 

Hey throw a 125 or 150 in there, do It off the line if you can hook, and Im sure, you will wet your pants, when you make your 12 sec pass

 

first off, l hit my nitrous in 1st gear at 2500 RPMs. l have a 305 with a 150 shot and 3.73's l am able to spin the tires quite a bit, but thats because the tires are complete garbage toyo proxes. of course youre not going to feel much of the 75 HP when youre in 2nd, and l think you might have had too high of an expectation for only 75 HP, get the 150 shot, blow it off in 1st gear and youll be very surprised at how much your motor comes to life. also be sure to keep the pressure at around 950-1000

 

juicin & mouse, what kind of fuel pressure are you running durring a hit? Or, are you running wet?

Still haven't figured this thing out.

------------------
"Why StockBastard?" you might ask. Well...
84 Berlinetta body w/custom paint.
92 front/rear bumper and ground affects.
89 IROC 350tpi engine w/lots of mods.
87 3.73 BW possi rear w/disk brakes.
86 interior w/IROC dash.
And finally, stock Vet rims from the early 70s.(same ones used on the 69ss)
ALL IN ONE CAR!!!
13.9@98.7
soon to be juicin'
hopin' for 12s

 

Ya im on a wet kit. If your on a dry, your gonna wanna up your pressure, for sure!!!

 

stock fuel pressure, and a wet kit, NOS #5151

 

Yes I believe the jets they come with are for stock fuel pressure, I would run some colder plugs, and when your about to spray put some racing gas in, around 100 or so, just so you have a less chance of a backfire.

 

You should definitely feel a difference. I started with a 50 shot just getting the system to work and could feel a difference. Once everything was working properly, I stepped it up to an 80hp. This was on my old 305 and it felt like a completely different motor was there. I knocked off 8 tenths and picked up 9.5mph over motor on the 80hp.



------------------
David Tuschhoff
1991 RS/Z28 Camaro
Fuel injected 355ci V8.
12.47 @ 110.7mph 1.80 60'
Best mph of 111.6.
My f-body page!

 

On only a 75 shot you will notice alittle bit in the seat of the pants. You probably would tell alot in a 1/4 pass on the clocks. i could tell alittle on a 100shot. On the 125 and really the 150 you will notice a big difference. Make sure you have about 900psi bottle pressure(full bottle also), have good solid fuel pressure through the pass. on a 150 shot I run no timing retard(on stock timing 6BTDC)ONLY WITH RACE FUEL!. If you want pump gas then 2-4 degree retard if you want to be safe. Run atleast 1 step colder/ maybe 2 steps colder plugs .
Don't hit the button until 3000rpms or you can have serious breakage.

 

anything under a 150 shot is just to aid the performance of your engine. Its helps the engine go faster through the rpms. A 150 shot is where you start to feel the difference. I have ran a 50 shot just to aid the pi$$ poor fuel we get around here and it helped a bit but nothing seat of the pants. If your engine can take a 150 shot go to a 150.
SSC

 

I think you should have felt a 75 shot more. My experience with nitrous system tells me you are probably running rich. Try cutting out .5 psi of fuel pressure if you can, but read your plugs, you don't wanna lean out, cause you will have molten pistons in a flash. Another option is to heat the bottle to somewhere are 1100-1200 psi



------------------
Jason "TrickFlow" Zajac

JnJSpdShop@aol.com

 

I've got a bosch in line pump on the way, that should get my fuel pressure up around 75psi (where it should be with a dry kit). Then I'm going to run a 100 shot until I can get my hands an an MSD adjustable timing modulator. THEN IT'T TIME FOR THE 150!!!

This should aid my sickness for a while

------------------
"Why StockBastard?" you might ask. Well...
84 Berlinetta body w/custom paint.
92 front/rear bumper and ground affects.
89 IROC 350tpi engine w/lots of mods.
87 3.73 BW possi rear w/disk brakes.
86 interior w/IROC dash.
And finally, stock Vet rims from the early 70s.(same ones used on the 69ss)
ALL IN ONE CAR!!!
13.9@98.7
soon to be juicin'
hopin' for 12s