turbo on a 400sbc

[Kyle]

lately ive been thinkin bout turbos, and i was wonderin how hard it would be to take my 400 that im building and down the road throwin a low pressure turbo on it. just 5psi so i dont have to worry bout splitting the crank...

would i need an intercooler for only running 5psi? ive been told that i dont with that low of boost....

can i run a regular n/a carb with a turbo or that low of pressure at least?

where would i run the oil feed line from? the oil pressure sensor?

the turbo thing is new to me so any extra info would be helpfull

[Jjay78]

you'd have to have heads on it that were low enough compression to start with on it...you would have to get a carb designed for a turbo,...you could try that route for oil, or try getting a different oil filter adaptor and running your lines from that.....

[justin0421]

you can also cut a hole in your oil pan and weld a bung in it for ur oil line and as for the engine u need heads and a differnt carb. call a speed shop they will give you advice or look into online sites and forums

[Kyle]

the heads will be runnin it in high 9s for compression, im not sure if thats too terribly bad if i wanna only run 5 lbs of boost. the reason i had thought about turbo is cuz the iron eagle heads only have 180cc runners

as for the forum thing, ive only found ones that are all about people just showin off and braggin bout how they fit a turbo under the hood of their car or stock truck

[J.C.]

boost is your friend! id run 10psi, why do all the work to just get 5 psi? if ya do it, might as well build it right the first time! watch out for detonation.

[Jjay78]

high 9's is to much compression, you gotta drop it

[Kyle]

boost is your friend! id run 10psi, why do all the work to just get 5 psi? if ya do it, might as well build it right the first time! watch out for detonation.

im with ya there, but how much is too much for a stock crank?

high 9's is to much compression, you gotta drop it

what would be a good range then? low 9s high 8s?

[betterbeaters]

if it was me I would not use a cast crank or stock rods...   if your going to spend the money to do a turbo why not build it to last?

[Jjay78]

for turbos i would say start off with low 8's compressions wise, maby even high 7's

[Jjay78]

if it was me I would not use a cast crank or stock rods...   if your going to spend the money to do a turbo why not build it to last?

x2 on that the stock cranks and rods in a 400 were never intended for performance to begin with, and that would really be over stepping their ability by a bit

[randycrane79]

lower the compression the better mid to high 7s be ok and def get rid of the crank and rods they wont hold

[Kyle]

i got forged 5.7 rods for it. and thats why i was thinking of only running 5 lbs of boost to keep a light load on all the internals. i know i see plenty of guys bolting a turbo to their stock 5.3 trucks and lt1s and beating the crap outta em and they still last

and for a turbo would it be better to run something with a shorter stroke or the longer? 350 crank vs 400 crank?

[Jjay78]

either will work, it just depends on how you set everything up,

[MR NASTY]

Look on ebay you can buy a whole twin turbo kit for a abc for around a$1000

[Kyle]

Look on ebay you can buy a whole twin turbo kit for a abc for around a$1000

thats what ive been lookin at, i know i can find a cheap turbo for less than 200 bucks and i know i can make evrything else or find a way to make it work

[Kyle]

either will work, it just depends on how you set everything up,

well i know the biggest downfall to turbos is their lag and to get the turbine to spool up faster wouldnt the shorter faster revving crank be a little better?

[J.C.]

50hp of nos will spool them up quick...

[Kyle]

50hp of nos will spool them up quick...

thats what i should do... strap a bottle of NOS to the sob... itd prolly be cheaper and less of a headache too.... or does that require really low compression now too?

[J.C.]

50hp of nos will spool them up quick...

thats what i should do... strap a bottle of NOS to the sob... itd prolly be cheaper and less of a headache too.... or does that require really low compression now too?

you can run it at any compression. it cools the intake charge, which makes it more dense, creating more power. push of the pedal, or a button. stock motor holds 100hp good. i had 125 on a 350, never hurt it. you get 3/4 of the amount of torque, of horsepower if that makes sense. 100hp worth of nitrous, 75 ft-lbs of torque and so on. cheapest power adder out there id say.

[Kyle]

50hp of nos will spool them up quick...

thats what i should do... strap a bottle of NOS to the sob... itd prolly be cheaper and less of a headache too.... or does that require really low compression now too?

you can run it at any compression. it cools the intake charge, which makes it more dense, creating more power. push of the pedal, or a button. stock motor holds 100hp good. i had 125 on a 350, never hurt it. you get 3/4 of the amount of torque, of horsepower if that makes sense. 100hp worth of nitrous, 75 ft-lbs of torque and so on. cheapest power adder out there id say.

cools the intake charge? i thought it was essentially air but the only parts of air that actually burn in the cylinder, in luiquid form, and it has to be mixed with the fuel via solenoids so the system isnt overloaded and detonated....

my 400 will be low 10s in compression with a stock crank with forged rods/ nos would be cool but i dont wanna send the bottom, well, out the bottom of the motor lol