s10cky

Hey guys, If you reply thanks alot!

Heres my deal. I was going to install a supercharger on my b18, decided that for me it would be cheaper and more effective too get boost via turbo and picked up some dsm 450s with clips and a b-series blox turbo manifold with a t3 flange for 200 bucks.

My motor is has ITR pisons installed with a non-vtec head. Compression according to most of the online calculators is around 10.8 to 11:1. It currently has Crower 404's and head work. So I know it will make some good power on little boost.

6-8 psi is what I had in mind. I've done some research and came too the conclusion that that will be somewhat safe (hopefully) on 93 with a good tune.

My concerns are here...and these questions are coming about because I have no boost experience.

1. What causes a car to overboost or spike? becuase If it does im sure the engine will no agree with it. and what can I doo to prevent it from happening.

2. Ive read that boost is different from volume of air. So, a T70 at 7 psi will theoreticly produce more power than a 14b at 7 psi. am I correct?

With that will a t3/t4 hybrid be overkill? Id like too have boost at around 2500 and pull too 8.5k.

Those are the two main questions I have in mind right now. If you could when replying give some pretty good detail so I can understand better.

s10cky

ttt

mitsuman

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by s10cky &raquo;</TD></TR><TR><TD CLASS="quote">Hey guys, If you reply thanks alot!

1. What causes a car to overboost or spike? becuase If it does im sure the engine will no agree with it. and what can I doo to prevent it from happening.

2. Ive read that boost is different from volume of air. So, a T70 at 7 psi will theoreticly produce more power than a 14b at 7 psi. am I correct?

With that will a t3/t4 hybrid be overkill? Id like too have boost at around 2500 and pull too 8.5k.
</TD></TR></TABLE>

1. the wastegate controls the boost. When my turbo b16 blew few years ago, it was due to a vaccum line slipping off the WG and it just shut. spiking to hell. also look out for boost controlers.

2. yes yo are correct a "smaller turbo" will make less HP than a "bigger turbo" at the same psi. BUT a smaller turbo will reach max boost faster than a bigger turbo, but will not be as efficiant in the upper rpm's.

a t3/t4 is not over kill but you will not reach max boost at 2500 thats for sure. maybe 4000-4500

hope this helps you out a little?

ho

s10cky

Thanks man.

I knew the wastegate controls the boost.

So, basically If I have any vacume leaks it will boost spike? That's crazy, that would really suck. I would really make sure that I install all the hoses brand new and get a vacume guage.

awdgsx96

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by s10cky &raquo;</TD></TR><TR><TD CLASS="quote">
So, basically If I have any vacume leaks it will boost spike? That's crazy, that would really suck. I would really make sure that I install all the hoses brand new and get a vacume guage.</TD></TR></TABLE>

If your going the turbo route, most boost gaues show a vacuum reading as well

mitsuman

iTrader: (1)

well im not sure 100% but i think it depends where the vacuum leak is. from my experiance the vacuum line came off directly at the wastegate. i would think the outcome woutld be different if somewhere else? or maybe i just dont know?

anybody want to enlighten me?

s10cky

I wouldnt think that it would matter where, becuause vacume is vacume, but i dont really know either...

mitsuman

iTrader: (1)

ya you are correct. if you do some research, there are these things called pop off valves, they work like BOV's they open once a certain psi is met and release excess air. now this is not to replace but just as a safety precaution incase the wasgete fails. search button is your friend

you can even make them out of a radiator cap, no vacuum source. will always work...