Engine braking?
BRAP BRAP BRAP...
Joined: Mar 2008
Posts: 424
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From: Plano, Texas
About racing ...
Your brakes are able (if not 90% worn ^^) to block your 4 wheels at high speeds. So the brake system is well designed to do his job : braking.
Why the hell would you interfere this precise braking with something more unpredictable like engine braking ? You just shift down when it's necessary. Engine braking is just a consequence, not something you try to use.
Your brakes are able (if not 90% worn ^^) to block your 4 wheels at high speeds. So the brake system is well designed to do his job : braking.
Why the hell would you interfere this precise braking with something more unpredictable like engine braking ? You just shift down when it's necessary. Engine braking is just a consequence, not something you try to use.
Useless topic = long winded post ?
I just used the question to think about what happens to the engine internally during engine braking. Especially since I recently returned from some mountain driving and did it....alot. For that I didn't think it was useless.
I just used the question to think about what happens to the engine internally during engine braking. Especially since I recently returned from some mountain driving and did it....alot. For that I didn't think it was useless.
BRAP BRAP BRAP...
Joined: Mar 2008
Posts: 424
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From: Plano, Texas
Just wanted to get the point across that engine braking is so inconsequential to engine life that you shouldn't think about it.
In other words, don't worry about it, it's safe.
"Worry"? No. Inconsequential? Probably. But I think the rotary is different in this regard from a piston engine. I was hoping some of the experienced engine builders, Ihor, Chris/Banzai would chime in on the subject and confirm.
BRAP BRAP BRAP...
Joined: Mar 2008
Posts: 424
Likes: 0
From: Plano, Texas
Now if we are talking about a car running premix without an omp, then I would say extended engine braking may be more harmful than in other situations. I'm a big advocate of the omp. I think the only problem with the omp design is the substance that it injects into the motor. Engine oil is probably the worst thing, besides sand, that you could inject into any combustion chamber.
No four-cycle piston engines that I know of inject oil into the combustion chambers to lubricate rings and cylinder walls. No four-cycle piston engines that I'm aware of require pre-mixing oil into the fuel to take the place of removed injectors for that purpose.
It's rpm and load based.
It's rpm and load based.
Slow your roll...
About racing ...
Your brakes are able (if not 90% worn ^^) to block your 4 wheels at high speeds. So the brake system is well designed to do his job : braking.
Why the hell would you interfere this precise braking with something more unpredictable like engine braking ? You just shift down when it's necessary. Engine braking is just a consequence, not something you try to use.
Your brakes are able (if not 90% worn ^^) to block your 4 wheels at high speeds. So the brake system is well designed to do his job : braking.
Why the hell would you interfere this precise braking with something more unpredictable like engine braking ? You just shift down when it's necessary. Engine braking is just a consequence, not something you try to use.
Yeah... none of that makes sense.
It's downhill from my brother's house to the first stop sign. The car wouldn't have very "precise braking" after holding the brakes going down a mountain for a third of a mile.
The hill is why "the hell."
There's also plenty of other very steep streets in the Bay Area. In fact this planet's covered with hills. No, really, check.
https://www.rx7club.com/showthread.p...&highlight=omp
I was referencing this on the S6 Denso, but maybe I'm missing something......
https://www.rx7club.com/showthread.p...&highlight=omp
https://www.rx7club.com/showthread.p...&highlight=omp
No offense to anyone here, but this is probably the most useless topic on here.
Simple driving rule:
Keep the car in gear as often as you can.
Explanations:
If you come up to a light and you keep it in gear as long as possible without changing down, you save fuel and brake wear. You're also cooling the motor internally. Think about it, you're cycling cold air without the heat of combustion. (Although this is minor)
If you downshift without rev matching, you're needlessly wearing out your clutch. (And making me sick)
If you downshift and blip the throttle, you're wasting gas. (But you're doing it the correct and fun way)
--------------------------
I personally heel-toe every downshift every time. It keeps me on top of my game and I stay familiar with my car.
Word of caution and advise. Part of the reason I heel-toe at all times(use the brake pedal while slowing) is because we live in a world of morons. If your car slows down but your brake lights don't light up, people behind you will enter stupid-mode like a miss-firing Honda enters limp-mode.
I also tap my brakes (like a racecar driver resets the line pressure) right before I start to brake. The only reason for this is to flash the brakes so people behind me wake up.
Simple driving rule:
Keep the car in gear as often as you can.
Explanations:
If you come up to a light and you keep it in gear as long as possible without changing down, you save fuel and brake wear. You're also cooling the motor internally. Think about it, you're cycling cold air without the heat of combustion. (Although this is minor)
If you downshift without rev matching, you're needlessly wearing out your clutch. (And making me sick)
If you downshift and blip the throttle, you're wasting gas. (But you're doing it the correct and fun way)
--------------------------
I personally heel-toe every downshift every time. It keeps me on top of my game and I stay familiar with my car.
Word of caution and advise. Part of the reason I heel-toe at all times(use the brake pedal while slowing) is because we live in a world of morons. If your car slows down but your brake lights don't light up, people behind you will enter stupid-mode like a miss-firing Honda enters limp-mode.
I also tap my brakes (like a racecar driver resets the line pressure) right before I start to brake. The only reason for this is to flash the brakes so people behind me wake up.
BRAP BRAP BRAP...
Joined: Mar 2008
Posts: 424
Likes: 0
From: Plano, Texas
No four-cycle piston engines that I know of inject oil into the combustion chambers to lubricate rings and cylinder walls. No four-cycle piston engines that I'm aware of require pre-mixing oil into the fuel to take the place of removed injectors for that purpose.
It's rpm and load based.
It's rpm and load based.
I mean since the omp is apparently rpm and load based, then as long as it works I wouldn't figure any damage or irregular wear would occur.
Full Member
Joined: Dec 2008
Posts: 213
Likes: 0
From: Rennes, Britanny - France
Wait a sec... "the hell" .. "precise braking" .. "unpredictable engine braking" .. "consequence" ??
Yeah... none of that makes sense.
It's downhill from my brother's house to the first stop sign. The car wouldn't have very "precise braking" after holding the brakes going down a mountain for a third of a mile.
The hill is why "the hell."
There's also plenty of other very steep streets in the Bay Area. In fact this planet's covered with hills. No, really, check.
Yeah... none of that makes sense.
It's downhill from my brother's house to the first stop sign. The car wouldn't have very "precise braking" after holding the brakes going down a mountain for a third of a mile.
The hill is why "the hell."
There's also plenty of other very steep streets in the Bay Area. In fact this planet's covered with hills. No, really, check.
You've just forget the first words of my post : "About racing ..."
Thread Starter
Senior Member
Joined: Aug 2008
Posts: 349
Likes: 0
From: campbell river british columbia
lol so the only issue with engine braking is when your omp is removed.. so im curious to know if there are any studys done stating that it does put more wear on you motor when its removed... anyone?
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