Camaro_Zach

iTrader: (19)

So with my dinky 50 trims making 15 lbs of boost...thats not the same as say twin 67's making 15 lbs of boost?

can someone explain this to me or what...cause i see guys making 700+ rwhp on like 9 lbs of boost, then other situations where people are making 13+ lbs of boost with the same hp.

JZ 97 SS 1500

iTrader: (2)

The difference is just efficiency.

Jose

Camaro_Zach

iTrader: (19)

i always thought it was manifold pressure...so no matter how hard/easy the turbos had to work...the manifold saw 15 lbs of pressure...how it built it didnt matter.

i realize im wrong lol.

so what two turbos would reach close to 800 rwhp "easily" what efficiency turbos would do the job. i see guys hittin 700+ on pump gas.

also how much of this is attributed to the plumbing? will too small/large pipes and too many bends cause issues with efficency?

Navy David SS

iTrader: (13)

My twin T-67's will do close to 800 each. On just 8lbs it did 635rwhp; on 17lbs (blowing the tires off on the dyno) they did 875RWHP. 18-20lbs will give us the 1,000 we are looking for.

All of the SS's set up is one off. No kit.

David

JZ 97 SS 1500

iTrader: (2)

IF you are trying to build a kit for a true race car to make the most power from the setup you can then you calculate all parameters for max efficiency. So you start with compressor maps, then piping diameters, bends and velocity. Also you look at intercooler endtank design...etc..etc.

Now for most kits just match the turbos properly to your desired boost pressure and you will see the numbers you are looking for. You need to post your engine combo to match the turbos. That changes things as well.

Jose

mahhddgtp

All depends on how much air you flow and how well the motor itself flows....

12psi with a big turbo will yield you more power than lets say 12psi with a small turbo would... Why? You're moving more air with the larger turbo

You'll see a drop in boost if you get a larger intake mani or exhaust manifold. Why? It helps the engine flow more.... Less pressure is being built up in the IM, and more of the air is going into your engine... That's what you want....

Plumbing/intercooler(s) have a play in it too.. Like Jose said... efficiency.

smokinHawk

iTrader: (48)

Thats only if your engine size is different the restriction is the tubing and then engine then exhaust which will determin the boost most likely.

just think of it as colder air makes more power then hotter air because that air is denser, easiest way to think of effeicency.

family sedan

iTrader: (3)

Air + Fuel = Power.

Simple as that.

muncie21

iTrader: (14)

Boost pressure is an indication of flow restriction or back pressure. How much air flowing 'through' the engine is a better predictor of horsepower than boost pressure.

Boostaholic

iTrader: (4)

15lbs of boost @ 190deg F vs 15lbs of boost @ 100deg F?

JZ 97 SS 1500

iTrader: (2)

A relatively stock headed 346 CI engine revving to 6500rpms at 15psi running a compressor effic. of 70% for both units would net around ~820hp at 190 inlet temps.

For the engine running 100deg inlet's it would net around ~955hp.


Jose

Camaro_Zach

iTrader: (19)

hahahaha honestly way to not answer my question at all. we know you need air and gas to create an explosion. thanks. roger. check. did you even read the posts prior to making yours? hahah

Camaro_Zach

iTrader: (19)

i wish i knew wtf these tti turbos were so you could do the efficiency on em haha. i know its 15 lbs of boost at peak of 111 inlet temp.

crazymofo1986

iTrader: (3)

look at it this way to. my buddy has a jetta and another gti there pushing 15 lbs. and there slow. lbs has no relavsion to hp. dont quote me on that tho,

TARZAN

iTrader: (12)

This is probably the best way to look at it, to help him really understand....its easier than trying to explain when you say "efficiency", because not everybody understands what an efficient turbo does better lol, or why for that matter.

-Will

ItsNotStock

iTrader: (24)

This thread is old...

Frost

iTrader: (45)

Look at it this way; this thread is like three years old...

Somebody09

What's a relavsion?

sujomatt

iTrader: (7)

i think he was saying relation?

cablebandit

iTrader: (37)

my incons took 15psi to make 735rwhp....my s488 only takes 7.5psi to do that.