[goatboy]

so i would like to know how much boost i could run?

my motor has 8.2:1 compression

and when would one need to run a retarder?

[70-yenko-nova]

retarder would be good but.. boost from what .. T25 stock sr20 turbo or a T88. Vortech V3 or a 2.2 KB Blower lol. Give me an idea and I can help you out.

[faststang90]

what are block to u have? what is your motor stock or a built motor
if u have a stock block i would not do over 8 ps i-10 psi to be safe.

look here
Boost Compression Ratio Calculator

[ryanw]

Boost is just left over air, (pressure) that wasnt used in the engine. If you take stock engine and supercharge it and your gauge shows 10lb of boost, and then you took thats same supercharger and put it on my car it might only show 6 lb of boost......im just pulling these numers out of my ass, but im trying to explain that when you see some one selling an 10lb pulley or 14lb pulley, thats bull shit, cuz thats not how it works

When you open up an engine with high flowing heads intake ect, it will take more to fill it up....my examples are not that good, but im sure you get the point.

[thisguysride]

on stock head gaskets anything over ten pounds will blow the gasket, it may be 12 but same ball park. also if your going to build a motor and you want to turbo it. then you need to build for that app.

[goatboy]

the motor has a stock block bored .030
eagle 4340 crankshaft
eagle 4340 H beam rods
custom srp pistons
edelbrock victor jr heads
fully rollerized rockers and cam. (cam is for a supercharger)
edelbrock performer rpm intake

so yeah i geuss im wondering how much supercharger (PSI) could it handle with the proper fuel upgrades

[ryanw]

Also if you get the car dyno tuned, then you shouldnt have to run a retarder, cuz all of that will be programed into the computer.

With your compression being so low, i would hope that your going to use a larger supercharger.
What you want is a supercharger that can push the most cfm at the lowest rpm......low rpm means less heat.

[goatboy]

thanks ryanw this is what i need to know. so if it were you, and this was your set-up what blower would you run?

[ryanw]

By all means , i am no expert....so take my advice with a grain of salt.

Id run a paxton novi 2000 or a vortech t trim , there are even better ones then that im sure but those really stick out to me and my plan is to run one my self

[goatboy]

so how big of pulleys would you put on the sc

[ryanw]

Every set up is different....like i pointed out in my first post there is no magic pulley on some random set up to create a specific amount of boost. You may have to let the dyno shop play around with different size pulleys, in order to maximize the power for your set up.

[WickedSnake00]

Originally Posted by ryanw Every set up is different....like i pointed out in my first post there is no magic pulley on some random set up to create a specific amount of boost.

Bingo. Way too many variables here.

"Boost" does not correlate to power or even airflow. Boost is the delta pressure to atmostpheric and doesn't necessarily express flowrate.

Think of it in electrical analog. You can turn up the voltage, which is a differential just like boost, but you may not turn up the current, which is like flow rate. Power is a function of both voltage and current, just like your ultimate power will be a function of both boost and flow rate.

Basically it will take some optimization for you to figure out what gives you the best gains.

Not to mention you haven't even specified well, anything. The only thing I'll say is you should be able to be fairly agressive with your power adder based on your surprisingly low CR.

[goatboy]

hey thanks alot ryanw if i got any more questions ill hit ya up for some answers.
cheers

[nolife]

Originally Posted by WickedSnake00 Bingo. Way too many variables here. "Boost" does not correlate to power or even airflow. Boost is the delta pressure to atmostpheric and doesn't necessarily express flowrate.

I use a straw analogy. You can build up a lot of pressure in your cheeks blowing through a small coffee stir straw but not much air comes out. Blow through a big slurpee straw and you will have more air flow but not much pressure in your cheeks. Your engine is the straw. Air flow makes power, not pressure (boost).

Mmmm Slurpee.

[RioRed95]

Nolife very good way of putting that! haha

[69fastback]

Originally Posted by WickedSnake00 Bingo. Way too many variables here. "Boost" does not correlate to power or even airflow. Boost is the delta pressure to atmostpheric and doesn't necessarily express flowrate. Think of it in electrical analog. You can turn up the voltage, which is a differential just like boost, but you may not turn up the current, which is like flow rate. Power is a function of both voltage and current, just like your ultimate power will be a function of both boost and flow rate. Basically it will take some optimization for you to figure out what gives you the best gains. Not to mention you haven't even specified well, anything. The only thing I'll say is you should be able to be fairly agressive with your power adder based on your surprisingly low CR.

What the hell?? You changed your sig!!!!!!




You should run 1 beeeeeeelion psi. It'll be mad fast fo sho.

[WickedSnake00]

Originally Posted by nolife I use a straw analogy. You can build up a lot of pressure in your cheeks blowing through a small coffee stir straw but not much air comes out. Blow through a big slurpee straw and you will have more air flow but not much pressure in your cheeks. Your engine is the straw. Air flow makes power, not pressure (boost). Mmmm Slurpee.

You win. Waaaay better than my electrical analogy. Why didn't I think of that? Damn my engineering analogies.

Originally Posted by 69fastback What the hell?? You changed your sig!!!!!!

Guess I don't pop up in the 5.0 section enough.

[gripthenboost]

I have a smilar set up to you. And im running 15psi which is fine. I could run up to 20 but i cant cool the air fast enough for it to be effective. But if we talk about that, thats a whole other thread.

[MIGHTYJO3YOUNG]

Here's your GOATBOY!!



I look like this when I wake up sometimes...

[WickedSnake00]

Originally Posted by MIGHTYJO3YOUNG Here's your GOATBOY!!

I would have guessed more like this-



MM- We're super cereal.