My Taco 3rd Gen Engine keeps dying for 1/2 sec when hitting rev limiter on 2WD,4H,4L

Indeed thats what i'm experiencing but in deep snow and on 2700 - 3038 M altitude. Super disapointing hoping Tuning Pro will find a way to overcome such stupid bouncing issue

 

"The RPM keep bouncing back when I reach the defined RPM rev limit". Your ECU is doing exactly what you told it to do. When you hit the fuel cutoff value, the ECU will cut the throttle. If you read your sentence out loud, if you don't want that to happen you need to change the defined RPM cut value. In attempt #1 your fuel cutoff is at 5800 rpm. in attempt #2, your fuel cutoff is 5600 rpm. Keep in mind that as delivered from Toyota, your redline is 6000rpm, so those numbers should be at least 6000, or you'll never even see your engine's full output. Per spec sheet, your engine produces 278hp AT 6000rpm. Below or above 6000rpm your engine produces less power.

There are dozens of posts on this thread that have been telling you that your engine will spontaneously explode past 6000rpm. Back when the 3rd gens came out and before OVTune became blacklisted many people did in fact set their fuel cutoff past 6000rpm - not suggesting it and your mileage will certainly vary. You can go to a variety of toyota parts sites and do a part number-by-part number comparison of relevant components in the different 2GR-FKS variants (there are 3) to see if this is a good idea for you.

EDIT: But if you hitting the fuel cutoff while spinning tires, you should carefully consider that too.

 

I have tried to follow what you mentioned using my vftuner tool to set both limiter to 5600, 5800 and 6000 but still cutting the fuel off. The default stock value is 6300. There is also rpm limiter engage value that i set to max to remain more at the limiter but that also didn't matter unfortunately. There is likely another relevant parameter to modify to overcome the fuel cut

 

He's not talking about taking that redline away.

When you hit the rev limiter, and it bounces back down 100rpm like you describe here- that is okay behavior. He is speaking about when you continue to hit the rev limiter for about a half second, the truck cuts power down to 2000rpm, which is exceptionally detrimental in a number of offroad scenarios.

 

Maybe so, but they didn't build engines for American Motors or Jeep back then, or for Toyota either. GM and Ford didn't have rev limiters for their trucks or ORV's . This is all before electronically controlled ignitions came about that I'm referring to. Personally, I like rev limiters, it's a piece of technology that makes sense.

 

Now you make me curious. Pushrods gotta have some type of the limiter, especially with manual

 

It's called valve float!

 

You beat me to it. Valve float made a decent rev limiter, but it wasn't consistent, as they might not float before a rod let go. And floating valves had their own way of destroying an engine, if a pair of keepers (valve spring retainers) bounced out of the valve spring cap and the valve dropped into the cylinder. It could be even uglier than a broken rod or spun bearings.

 

The only times i ever get close to hitting that limiter is when i'm drag racing against Vettes and Teslas, but i never hit the redline, i win the race just before that happens.

 

Bang limiter harder

 

This right here is why. For us in FL it's all the deep soft sand. It's ok our engines like to rev high.

OP have you made sure it hits the rev limiter in 4L? For sure in 4hi it hits. I'm having a hard time remembering in 4low. The last time I was out in deep sand I was under the impression that in low gear it removes the fuel cut off.

If it removes the fuel cut off in 4L, you may have work around with the 2Low mod. Just a suggestion. I feel like the last time I was out in deep sand I had to go to 4low to get up a step deep sand incline and I had no fuel cut off. On the same incline it kept getting cut off in 4hi.

I doubt it, but it could be my tune.

 

I used to hit the limiter in my Miata quite a bit on track days or mountain back roads. I guess I'm lucky I didn't blow it up. These engines were over-engineered and pretty tough but I was making over twice the stock wheel horsepower with mine (supercharged) and it was really easy to hit the limiter in 1st, 2nd, and 3rd.

 

Maybe you should keep it under 3 grand, you know, for safety sake...

 

Bringing this thread back up, and have to say as someone who is VERY experienced in offloading in sand at Glamis (my entire life), when I take my Tacoma out there the only way I can bounce off the limiter is in 2WD. Anytime I'm in 4WD, I hit the limiter & BAM, instantly drops my RPMs down to like 2400-3000rpms putting me COMPLETELY out of the power band & in a BADDD spot while climbing a dune. I have to basically feather the throttle while climbing sand dunes to make sure I don't hit the rev limiter because otherwise I'm up shitcreek, but obviously there is reduced power/torque when I'm feathering between 4000-5000rpm. What I need is for me to be able to bounce off the limiter while in 4Hi. Even with all the traction nannies disabled, it still does not allow me to do this. I have been looking for a way to allow me to BAH-BAH-BAH-BAH-BAH off the limiter so that I can climb hills. I'll post a video so everyone can see why I need wheel speed in 4Hi. Right now I mainly cruise around in 1st gear 4Hi but sometimes go into 2nd gear in 4Hi but prefer 1st since I have to be ready with power in case I come across a tricky situation at lower speeds as I crest over dunes. Also, FWIW, I only offload in 4Hi while in the sand, the 4Lo wheel speed is wayyyy too little for the big dunes I climb.

https://www.youtube.com/embed/4haUdtAjHJ0?si=k664GhlXy7Ad2E0Z

 

I don’t think anyone has any idea how to make it a normal hardcut limiter like the 2g tacos. The only workaround is the get off and back on the throttle method

 

I managed to find a workaround to fix the hardcut limiter using my vftuner it wasn't straight forward though but luckily well fixed. Here's a short video

https://youtube.com/shorts/BbsPEhD7B90?si=Ob-AwUnJVo3dsHva

 

Guess that works.. doesn’t have the same hardcut as before though. Sticking with the weird throttle method lol

 

When your driving skills fail you, throw money at the problem.

 

5500 rpm limiter is also questionable.. mines set at 7200

 

I raised it to 6000 which's more than enough given the default was 6300. I don't think 7200 is safe ! And you will still need to get off and back on the throttle which doesn't help !