F/I Blowing motors facts

[FRS Justin]

Well I would hope the MAF reading would not change do to you plumb nitrous in after it.....
Please tell me you have someone else working on your car.......SMH

[totopo]

I don't think most people consider nitrous as naturally aspirated as the whole point is to bring more than atmospheric oxygen into the cylinder?

Just to do the math, to get 300hp out of a 2l engine... assuming you are an amazingly awesome (f1 grade) engineer and can get 210 PSI of BMEP out of the engine (haha), that would equate to a tq of 169 ft. lbs, so to get 300 brake hp you would need... 9300 rpm... hahaha... To get 300whp, with a loss of ~15% you would need... 10,700 rpm... hahaha... since peak hp is usually 15% less of peak tq you would realistically need to rev to 12,300 rpm...

Okay, so not possible on gasoline, so how about e85? I can't find any realistic numbers for e85... some paper claimed they got to 19 bar (275psi) of BMEP, but that's supercharged... In any event, to get down to a realistic level of ~9000 rpm, you would need a BMEP of 287 PSI or 19.8 bar (230 ft.lb of torque!!!)... don't think that's realistic...

Edit: In any event, it's kind of a moot point, the rods bear force, not power. So really, the limit isn't hp, the real limit IS the BMEP. So the reason NA hp doesn't always equate in terms of failures to FI HP is that FI boost TQ (BMEP) WAAAYYY higher than NA, and usually can't rev as high. So if the rods fail at 300 whp FI, you would need to see what their max tq is at, then that is the max tq you can hit on NA, which likely you'll never hit because it's na. In this respect nitrous can be seen more like FI, as it boosts your BMEP to rediculous levels.

[go_a_way1]

Originally Posted by mrk1

Depends how you look at it, wet or dry kit. Nitrous is 33% oxygen which is really the goal here no matter what we are talking.

Dry vs wet, why nitrous also has nitrogen is another discussion (absorbs heat, stability)

Thanks for the info!


Lets just plumb pure O2 into an engine and see what happens
hahaha!

[mrk1]

Originally Posted by go_a_way1

Thanks for the info!


Lets just plumb pure O2 into an engine and see what happens
hahaha!

Lots of reasons not to do that haha

[go_a_way1]

Originally Posted by mrk1

Lots of reasons not to do that haha

LMAO but that would make like 5x the HP!! my 200HP NA FRS would be 1000HP NA FRS for about 23 seconds

[strat61caster]

Originally Posted by SUB-FT86

I couldn't care less about 300+hp on a 2800 lb RWD coupe. The fastest street car I've driven was a automatic 335i which makes 265whp/300wtq in a 3550 lb behemoth of a body and I was blown away by the straight line acceleration. I would be happy at 235-250 whp-200-210wtq so a low psi turbo sounds like a plan in the future.

I keep waiting for a CARB legal kit/tune to blow but it hasn't happened yet to my knowledge. Same boat as you, seems like the way to go for someone who doesn't have something to prove, the 4 kits off the top of my head offering canned tunes land right around 240whp and can be DIY installed, tens of thousands of miles on multiple cars so far. Definitely my plan for the car in ~4 years time.

[mrk1]

Originally Posted by strat61caster

I keep waiting for a CARB legal kit/tune to blow but it hasn't happened yet to my knowledge. Same boat as you, seems like the way to go for someone who doesn't have something to prove, the 4 kits off the top of my head offering canned tunes land right around 240whp and can be DIY installed, tens of thousands of miles on multiple cars so far. Definitely my plan for the car in ~4 years time.

CARB setups are a lot less aggressive so your surely going to see less problems but you'll also see less HP. For my dollar I want more then 240whp from a FI kit but I also dont live in CA.

[raven1231]

Originally Posted by mrk1

Is Nitrous still considered NA?

Not to most people

[350matt]

Nitrous is chemical supercharging - uses a chemical reaction to generate the extra air inside the cylinder
the end result is the same - more cylinder pressure just like you had fitted a blower... so no nitrous is not an NA mod

[ajc209]

What people are not getting is that engines have tolerances and the level set at 250whp is to guarantee within reasonable doubt a reliable car. Sure a certain percentage of cars might take 350whp for 50k and multiple trackdays but its not going to help the likes of Cosworth when those customers come back with broken engines....


Sent from my GT-I9300 using Tapatalk

[FRS Justin]

Originally Posted by CSG Mike

Why? You can take a stock FRS, put on a header, front pipe, C23, nitrous, and easily make 300hp.

You're really just showing how limited your experience is with these posts. Think outside the box, instead of limiting yourself to what you commonly see on this board.

What I see on this board is me setting records not testing parts.
I think its obvious who knows what. on this forum 300hp n/a man. Do the research and you will see what I have built and what I have done. I m sure you do ok doing what you do but your definitely no front runner.

[CSG Mike]

Originally Posted by FRS Justin

What I see on this board is me setting records not testing parts.
I think its obvious who knows what. on this forum 300hp n/a man. Do the research and you will see what I have built and what I have done. I m sure you do ok doing what you do but your definitely no front runner.

[strat61caster]

Originally Posted by mrk1

CARB setups are a lot less aggressive so your surely going to see less problems but you'll also see less HP. For my dollar I want more then 240whp from a FI kit but I also dont live in CA.

The whole point of this thread is that shit starts breaking as you ramp up the power, gotta pay to play. Never posited the argument that '240 whp is enough' (or trying to posit that 250whp is the 'limit'). I bet more than a few people will read the OP and come to the conclusion that all FI is unsafe on a stock block when so far it's been pretty bulletproof if you're conservative. Especially when this is the headline:

Here it goes, THE NUMBER 1 REASON the fa20 blows up under F/I is THE RODS SUCK they are nothing more than TIME BOMBS under the STRESSES that F/I PUTS OUT!!!!!!!!! PERIOD the END!!!!!

And for ~$5k, less than 20% of the initial purchase price of the car, a ~50% increase in power that's reliable, daily drivable, and not illegal ain't too shabby. I plan on driving this car hard, my dollar is going towards the most reliable setup and I'll probably never bother to dyno it, much less take it to the strip.



As to the rest of the thread.

[Yoda]

I read this thread when there were no replies and I thought good please let it die. Now four pages later I find people being trolled. Let it die the information he is proving is not accurate and we all know this.