Thread: Rev limit feels like hitting something..?

i seriously doubt it.. i would try to break that habit (pun intended) cuz it seems like an easy way to get rod knock or something..

Oh I don't make a habit of it all. But when it does happen I feel like stock cuts will be more damaging than anything,

that's how i got rod knock with my first sr lol.. top of 3rd gear pullin on my buddy an i got greedy an didn't shift soon enough

Thanks for the heads up. I try at all cost to keep my highest shifts at around 6800rpm. But last night was the second time letting it go past..\\\edit- not last night, night before. graveyard shifts are destroying my perception of times/days. lol

Sometimes I think the rev limit is so harsh because Nissan wants to communicate to the driver how poorly they are treating their engine. The real worry when surpassing the stock limit is potential for floating valves and/or breaking or dislodging rocker arms. The risk of breaking or dislodging rocker arms or experiencing valve-to-piston contact does not go away just because you have a smoother rev limit. A smoother limit just encourages people to ride the limiter which is likely just as violent to the valve train but since it feels so nice to the operator the engine isn't treated with the respect it needs.

I have a very mellow rev limit on the AEM EMS and it really encourages just keeping your foot into it while the tires spin at the limiter. I don't think this is any more pleasant to the engine though. Only to the driver.

Stay away from the limiter. I think it's harsh for a reason. To communicate what you're risking doing to the engine. Even if it were nice and smooth I believe the damage potential is almost as great to the valve train. What would be best in my opinion would be a rev limit set at maybe 7,800 rpm and never hitting it or exceeding 7,500 rpm. But that's not something that any manufacturer could ever release.

My 2¢.

Well, from what I read, it's cutting the spark before it's cutting the fuel, therefor putting more gas into the cylinders when the spark comes back. I just see this as possibly causing more damage in the long run than anything. I rarely ever rev that high, even trying to excel rapidly I shift at 5-5.5k Absolute most I ever like to let myself go is high 6s.. But the occasional time I slip up and do hit the limiter, I'm afraid it will cause more damage with the spark cut than anything else. I have officially decided tax season is going to mean EMS time, probably an AEM system. My car could definitely use a good tune anyways, and I could set both spark and fuel cut to go simultaneously at the stock 7200rpm (for now, until I get a bit bigger on my build)

Oh yah, that 7,200 limit on the B14s is retarded. No one puts up with that for too long. 7,500 is totally fine and lots of people get G20 ECUs or other ECUs to get rid of that stupid redline.

I don't know where you read that spark is cut first, but it is not. Fuel is cut on a cylinder-by-cylinder basis one at a time until fuel is cut for all cylinders and then I don't even remember is spark is cut at all or not. Maybe it is. But fuel is cut first. This is to protect the catalytic converter from seeing raw fuel. An ignition cut first is actually more desirable in many circumstances.

Maybe I was reading that thread wrong, it was late at the time :P

Regardless, I'll be going with a full EMS as soon as tax time comes. I've been wanting to anyways after looking in to JWT and Calum. Being where I live finding tuners for either would be a PITA so i think the EMS is my best option, especially since I'll be doing my mods slowly over time, and have a tendency to change things up with my cars quite often.

if you can afford the ems get it altho you can get your ecu chipped by jwt and have the whole process take a week. The jwt still has the crap limiter tho.

Yeah I'm going to go with an EMS when tax time comes. Snow is here anyways now so when I am driving I wont be revving high anyways.