00blacktrailwagon

My Cousin has a 90 Chevy that has a 350 engine in it and he wants to know what how big of a shot he can run. The engine has 120k on it. He wants to spray a 50 dry shot but if he can do more he wants to do a 75 shot. Would his truck be able to handle it? What fuel upgrades if any will he need? Any help will be greatly apprecitated.

AintNoHo

On a stock '90 TBI 350 a dry 50hp shot won't work. It would ping like hell. A wet plate on a good engine is recommended up to 150hp with stock timing. That would double the engines output.

00blacktrailwagon

I dont know much about these trucks but i why would it ping? Is there not enough fuel? How about anything less that a 50 like a 25/35 shot?

silver-mod-o

iTrader: (15)

a 25-35 shot wouldnt even be worth the time to install IMO... just get the wet plate and dump the 100 shot in it and have a good time and enjoy the fruits of your labor.

ZR1 DREAMING

iTrader: (28)

silver-mod-o

iTrader: (15)

AintNoHo

Yes, not enough fuel. Would need a MAF or a wide-band O2 to compensate. The pre 96 cpu (obd1) can't do it. It needs a wet plate or wet nozzle. On a heavy truck, you wouldn't notice a 30hp shot and it probably would still pre-detonate.

00blacktrailwagon

Well AINTNOHO i just ordered a kit froma company called dynotune and here is the kit that i got. He is planning to go with a 75 shot and see how it lookson the dyno.

http://www.dynotunenitrous.com/store...?idproduct=109

00blacktrailwagon

Do you think that he will need anything else for the install?

AintNoHo

Looks pretty good to get him going. Later on he'll probably like a bottle heater and a pressure gauge. A constant 900psi gives the most consistant results. In case he doesn't know, TBI uses about 13psi fuel pressure not 43psi like EFI so he'll need to use a bigger fuel jet. I saw they have a calculator on that site to figure it. Have fun.