F/I Blowing motors facts

[rosol16]

If I were to want to go FI and be safe I assume I should go forged rods and pistons with a 9:1 or 10:1 compression and I should then be relatively safe with 400whp+?

[#maverick#]

Originally Posted by FRS Justin

Stock rods? If so you got a good one and I agree about the tune. If you don't go crazy on the timing it will help along with setting your cam timing to bleed off cylinder pressure some


but if you go all out its another story....


Like I said in my first post I have friends pushing 500 hp and are living there tune is moderate
and then the guys that went all out with 350hp go poof


edit for the guys that are going to ask 500hp on E85 350hp pump gas because of E85 availability 500 drives with sense 350hp total hazard if on the same block

500 completely stock motor. I run about 20 degrees timing advance at WOT iirc, on e85 its pretty safe.

[LOLS2K]

[FRS Justin]

Originally Posted by rosol16

If I were to want to go FI and be safe I assume I should go forged rods and pistons with a 9:1 or 10:1 compression and I should then be relatively safe with 400whp+?

With a good tune from a reputable tuner you would be good to go

[FRS Justin]

Originally Posted by Draco-REX

I keep spot checking this thread for "facts" and I can never find any... Is this thread beneficial at all, or is it just a flame fest?

Per Webster dictionary


Definition of fact

1. 1 : something that really exists or has occurred <Space travel is now a fact.> EX. People running high boost have broken rods is now a fact
2. 2 : a true piece of information <“I just know for a fact that she has a huge family to feed!” — Kenneth Grahame, The Wind in the Willows EX. I just know for a fact people have broken rods under high boost.

If you can't see it now I can't help you

[#maverick#]

Originally Posted by FRS Justin

With a good tune from a reputable tuner you would be good to go

Depends on the fuel, there is no reason in hell to go that low of a compression on a direct injection motor if you are running E85, lowering compression is only to compensate for bad fuel. On E85 the lowest CR I would go is 10.5:1. I personally am getting an 11.5:1 built motor.

[FRS Justin]

Originally Posted by #maverick#

Depends on the fuel, there is no reason in hell to go that low of a compression on a direct injection motor if you are running E85, lowering compression is only to compensate for bad fuel. On E85 the lowest CR I would go is 10.5:1. I personally am getting an 11.5:1 built motor.

He could push 600hp on E85 and a good build with his planned setup with a high boost big turbo. I don't know what his plans or gas availability is, maybe he wants to go 400hp and last 50 to 100k. So it hard to answer without knowing his needs.


You sound like me in it to win it personality not someone that's happy just to be there. So for you yes higher compression and not being afraid if it breaks works


Maverick what turbo do you run

[VitViper]

I feel like this thread might give my 500hp stock motor FRS aids, so I probably shouldn't read it all.

[FRS Justin]

Originally Posted by VitViper

I feel like this thread might give my 500hp stock motor FRS aids, so I probably shouldn't read it all.

Sounds like your car already has aids in first gear, WTH is that sound during the first 40 to 50 feet


[ame="https://www.youtube.com/watch?feature=player_embedded&v=ix8v0uxodME"]Turbo FRS Launch Control - YouTube[/ame]






and that bog when it gets traction in first gear wow I have never seen a 450hp frs bog in first gear on stock tires

[johan]

Originally Posted by FRS Justin

Sounds like your car already has aids in first gear, WTH is that sound during the first 40 to 50 feet

and that bog when it gets traction in first gear wow I have never seen a 450hp frs bog in first gear

LOL it's called ignition cut traction control...lol. It's how a real ecu actually keeps you moving forward.

[FRS Justin]

Originally Posted by johan

LOL it's called ignition cut traction control...lol. It's how a real ecu actually keeps you moving forward.

Dude why would you use launch control with traction control. smh


boost control will also keep you moving forward be easier on the engine and not bog

[johan]

Originally Posted by FRS Justin

Dude why would you use launch control with traction control. smh


boost control will also keep you moving forward be easier on the engine and not bog

[totopo]

Can someone explain to me the animosity? why is everyone so instinctively butt-hurt? It's not like there is anything that shocking presented? can someone, instead of snarky comments, use words and explain why they are so offended?

Maybe it's because people have this wrong concept of mechanical failure where there is this magical HP number, where everything under it is hunky-dory safe, and everything over is immediately OMGWTF it's going to fall apart and brake. That's not how the world works, unless you are going to ridiculousness on either side. Ignore the shape of the curve, and the actual values, but the survival curve based on HP with stock internals assuming you don't have a retarded tune should look something like:



Note that this is % surviving. So are there 300whp engines that survive longer than stock engines? Most likely! Since up to whatever time point, it's not 100% failure, where as some stock engines start failing at low miles. Are there 500 whp engines that will survive longer than 350hp? sure. But I don't think it's necessarily economically wise to plan for a 300hp engine lasting 100,000 miles...

So the real question that only people with big pockets like subaru or maybe the big tuners know, is what the actual shape is at what hp level, and what are the components that brake, in order of likelyhood.

So if I understand properly, since FRS Justin has an n greater than 1, he believes in his personal experience, that it is the rods that break first, and if I understand him properly, he believes that the failure rate past 300-325 whp is uncomfortably high for his personal values.

If you are willing to take the risk and boost to 500whp, so be it, but I don't understand why you would be mad if someone told you that your engine PROBABLY will fail more quickly. And when it blows, don't assume it's the tune and would have been perfectly safe with a different tune.

[VitViper]

Originally Posted by FRS Justin

Sounds like your car already has aids in first gear, WTH is that sound during the first 40 to 50 feet

and that bog when it gets traction in first gear wow I have never seen a 450hp frs bog in first gear on stock tires

Do you comprehend the difference between bogging and launch control? Do you understand what true launch control is?

Here's a hint: the engine RPM never went down (IE: bogging).

Originally Posted by FRS Justin

Dude why would you use launch control with traction control. smh


boost control will also keep you moving forward be easier on the engine and not bog

Boost control alone will never give you optimal acceleration when launching a vehicle, you will either have not enough slip, or too much slip (riding the rev limiter, must be your version of launch control).

By your definition the engineers at MoTeC are retarded and got it all wrong?

Or maybe in your attempt at a cute retort you made it apparent how little you actually understand and instead how truly ignorant you really are. What are you, 12?