F**k the plugs. Turbos and engine seals are more expensive, methinks.


Dave

 

Okay...well how much engine and turbo damage do you think I'm doing if I rev to 3K and kill it?

My mechanic must believe that it isn't hurting the car very much.

-E

 

A short blip to 3k on a warm motor before shut down is obviously not going to hurt anything. Just ask the mechanic about the plugs, he must find it to be a solution to the fouling issue.

Next time we'll do it when it isn't raining.

 

Yeah, he does. Just picking brains on the board for a more detailed explanation. Preventative "maintenance" on the plugs as an impetus to get me to rev was good enough for me at the shop. Now my curiousity is piqued though.

Yeah no doubt about the rain. Sunday was nice though...'cept for the little accident. He was okay though, so all went well in my book.

-E

 

AdamC, you are soooooo right!
I would add to the Idiots, Ricers too.

 

RonKMiller unfortunately I don't have a turbo car to test on. But this is what I read off of Pettit. It was one of their maintence ideas. And well considering they are fairly well known in the rotary industry I thought other might have tried it. http://www.pettitracing.com/Frameset.html that is their link. Go to FAQ and then how should I care for my RX-7 I am pretty sure I remember it being there but it doesn't currently work at least for me. Just a suggestion but I would like to know what eveyone else thinks.

- Steiner

 

Are you guys even reading the last few posts??!!

mrb asked a legitimate question. He didn't say the guy was gunning it at shutdown. He said "rev the engine some " before shutdown.

Now it seems it may have a legitimate answer.

He may have race plugs that he doesn't want to foul.

Then again, he may be an idiot. Dunno.

Just want mrb to find the potential helpful answer in this thread.

-E

 

enuttage, sorry to have pissed you off.
Allow me to explain:
First, I have a super slow computer and connection.
Second, when I read a post that I want to reply to, I might start the post and something comes up and I stop the post. By the time I finish it and submit it, other posters are in and it seems like you are not following the discussion.
Third, I am very slow with the keyboard.
Fourth, still doesn't change my opinion on the subject.
Happy now???

 

My vote is idiot.

I don't know what you consider race plugs, but I was running NGK 11s for both leading and trailing plugs on my car and having no trouble starting whatsoever. They never fouled and were a nice tan color whenever I checked them.

Bottom line... if you want your turbos to last, don't rod the hell out of your car right before you shut it off. A turbo timer can help, but your best bet is to let the car cool off while it is still in motion. Damon is 100% correct about no airflow through the oil cooler when the car is stationary, so just drive light throttle for the last mile or so before you reach your destination and then turn the car off. Problem solved. Turbo timers are for people who A) like gadgets, and/or B) are too lazy to treat their cars properly, in my opinion.

 

I'm using NGK NR6725-105s. I'm not having a bit of trouble starting, but I have cleaned them once already after only about a month of use. There was considerable idling going on, being moved in and out of the shop for a week straight and then fighting heavy traffic a few times as well. That may have been the sole cause of the buildup.

That's cool. Maybe this guy IS an idiot, but I'm trusting in my mechanic for the time being, as I have no evidence to suggest he's wrong yet, or an idiot.

I always do a "cool down lap" before I get home and I'm thinking Damon's also right in that a 3K blip won't kill the turbo or the engine.

-E

 

I didn't search at all, and i apreciate yall helping me out on this topic.

 

No sweat dude.

-E

 

I think Eric mentioned this was something Steve did as well.

 

Ahhh, I should have read more carefully - I am talking COLD start.

I don't think it means a thing if you rev it before shutting it down, unless you just like to hear the sound. But hey, I'll go check out Petitt, I may not agree with their prices but you gotta' respect em for their expertise. They are actually honest too......

 

Cavell, find out why he does it

 

Maybe his horn doesn't work, and he is letting his wife know he is home.

Blipping the motor to 3k once isn't going to clean out anything!

 

Why would anyone rev the car up, shut it off, let raw gas into the chambers, or cylinders, and wash all the oil away so next start up is dry?
Exmple-Years ago had a modified stock car, running alcohol. After normal shut down, we would hear a sqeeking noise inside the engine during the next start up. It was the alcohol that had stripped the oil completely off the cylinder walls, and the rings were rubbing against the dry cylinders. What we found to cure it, was let the engine shut down after stopping fuel flow with a cut switch. This allowed oil to remain on the walls. No more problems.

 

I can see it now, a nice crisp rev to 3 grand, the turbo comes to life almost making a pound of boost at idle, and then click, no ignition and no fuel. The engine slowly expires...but wait...the turbo is still spinning! By this time the engine has stopped, oil pressure is at 0, and that wonderfull overstressed little turbo shaft that rides on a BUSHING OF OIL PRESSURE comes crashing down and puts a nice little gouge in the bushing suface. Keep this up and I'm sure your mechanic will be happy as he will have plenty of work installing a new set of turbos on your car.


Jon
'93 SSM base
354 RWHP on stock turbos
*and not revved before shutting off*

 

Okay, called the mechanic, as you guys piqued my interest.

He says:

Because of my healthy engine, port work and larger primary injectors, he recommends shutting down at 3K because of the excess amount of fuel potentially on the plugs for startup.

He says it's safe for the car.

As far as rebuilding anything on my car...my turbo is non-rebuildable and not purchased from him.

My engine rebuild was done by Pineapple.

He has no financial interest in intentionally destroying my engine or peripherals, nor do I think he'd do such a thing.

-E

 

So you rev to 3k and turn the key off at 3k???

I'm seriously asking, I can't figure what the hell you guys are talking about..

 

Yep. You got it.

-E

 

This thread is stupid. I don't see how it could make a difference either way. It's not like revving the engine to 3k is going to stress it at all, and I seriously doubt that cutting off the oil flow to the turbos for the .1 seconds that they take to spool down is going to hurt anything (i.e. the oil does not just disappear).

I can kind of understand the advantage of cleaning the plugs, but that is a long-shot in my opinion, especially with a fuel injected car. On my old snowmobiles, I used to run at WOT occasionally to clean off the spark plugs, kind of like one would do with the FD... but a short blip to 3k, I think will do nothing.

A lot of people seem to have strange rituals that they think will prolong the life of their car, but most of the time it's just a waste.

 

So, you step on the gas, putting fuel into the engine. Then you shut off the engine to remove the fuel you just put in there. This is done to prevent fuel buildup on the spark plugs for the next time you start the car.

Maybe I am the idiot!! That doesn't make any sense to me. If the car sits for any length of time, any little bit of fuel on the plugs will evaporate anyway. Is this supposed to prevent flooding?? If so, you shouldn't need to do this unless you have a flooding problem. I don't think that is a normal problem with our cars. If you do have a flooding problem, it should be fixed, not dealt with in this manner.

In addition, I don't see how letting the engine turn over a couple of times with no spark is going to remove fuel from the plugs. Spin dry effect maybe??

 

If you have any more questions, just call him:

Mohammed Jaloudi
MZM International
512.837.6200

He'll explain everything to you personally. Just tell him I had you call.



-E

 

motorcycles rev because superbike/motorcross bikes do not idle on their own, it's a saftey issue

if you drop the bike it stops running....makes sense

so you have to constantly rev the engine to keep it running


the jackasses that own bikes/dirtbikes residentially, decided it's "cool" and do it too

in my opinion, the rx7 rev before shutting off is from the movie, that's it