new to forum, looking for reassurance

[baxsom]

hi guys,
I am new to this forum and I promise I have looked for an answer to this question everywhere but I never saw a definite answer that made me feel comfortable. I purchased a 96 GS from a coworker and just wanted to get rid of it to buy something else. He did what seems to me pretty extensive modifications to it and I just wanted to see if they were pretty decent. It has the 420A motor, hahn stage 2 with FMIC. The stock pistons were replaced, ground microbalanced crank etc in the motor. greddy cat back,
upgraded suspension etc. all in all it seems like a lot of the mods that I have read about here. oh and the compression has been lowered to about 9:1 if i read the spec on the motor rebuild correctly
To be safe it is only set at 4lbs of boost. i was told that it could go higher with the profec 2
high boost to around 10 and still be ok I just havent done it yet until I get used to the car itself. Sorry this is getting long I just wanted to provide as much background on the car before I asked my question

Now on to the subject. It came with a zex wet kit still in the box never installed.
i want to install the kit mainly because its there but boost is something that I am just not sure on how to mess with. Using the 55 shot what is the theoretical maximum i should set my high boost at on the controller and still leave some conservative room with the engine that way it is now.


Again I am sorry this is a long post but I just dont want to be one of those people who jump into something with no knowledge on it.

thanks

 

[L2RTSiAWD]

I'm going to move this ti the turbo conversion forum so it can be better answered.

 

[GSGoinFast]

are the rods replaced? if the rods are replaced with forged ones you can boost a bitmore. i would say 15 would be pretty safe. ive heard that 10psi of boost can spike to 20 with nitrous, so keep that in mind when choosing the shot

 

[baxsom]

i know that the pistons, rods, rings, bearing, valve springs, and cams were replaced because I saw the receipts and talked to the engine builders.
what happened was the hahn kit was originaly installed on a totally stock 420 motor and at 6lbs a stock piston cracked. the previous owner then had the motor built from the block up but he was then a little gunshy about turning the boost up

i dont offhand know the names of the parts but i remember adding the receipts to about 30K for all of the work so hopefully it was done correctly

 

[miamieclipse]

well i don't know much about boost and bottle. But if i were you u would not mix them together, maybe an intercooler spray perhaps .

Now if the engine has forged internals, lets umm, how u say raise the boost :laugh:

 

[xxthayxx]

are u still using stock injectors?even if ur block is built i wouldn't go over 7-8 lbs on stock injectors.get some bigger injectors with some way to control them(sfmu,8-injector setup-stand alone or megasquirt)and u'll be much happier.

 

[baxsom]

i know they are stock injectors
i have been considering a venom fuel rail and 550cc injectors and controlling them with a apexi S-AFC II. Venom told me that I didnt need the fuel controller because my stock computer would be able to compensate for the extra fuel but I just dont believe it.
Does anyone know for sure if the stock 420 injectors can be replaced with 550's and not need a fuel computer

 

[xxthayxx]

yes u need fuel controller..venom is full of crap,are ecu can only do so much..largest injectors you can run with the factory ECU are 550 cc/min injectors, and that's with a minimum of an adjustable fuel pressure regulator like the sfmu and an S-AFC(maybe leaned out about 30 to 35 % with the safc and it should idel fine).other than that you will need a stand alone(accel dfi,megasquirt,8-injector setup) to run more or larger injectors.

 

[baxsom]

thanks for the reply
i thought venom was smoking something but i wanted to make sure
I was considering the S-AFC II anyway
so this is just a reason to go ahead and get it

is it mandatory to change out the fuel rail with new injectors or just a good idea
just wondering