Staceman
New member
URD makes this, but I should not need to "modify" my rig so it runs like a Tundra that's 5 years older......
Underdog Racing Development
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Underdog Racing Development
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Now I am REALLY wondering about my V8
- Thread starter Staceman
- Start date
Billynath1988
Senior Member
what air filter are you guys running with the hesitation?.. Even brand new stock paper filter vs the pro dry S made a difference in throttle/down shift response time for me. Prior to that change I had similar complaints.
I had a chance to try some things out today.
It seems more sluggish when the engine is cold, but I can't tell for sure.
It really only pushes me into the seat if I start from a stop. If I'm rolling it's doesn't really have the same effect. Maybe it has to do with the torque converter. At a stop the torque converter is slipping, so it's making torque. If you are coasting along it is only lightly loaded, so the engine has to spool up a bit to get the input speed higher than the output speed of the torque converter. The lockup mechanism could make this worse if it unlocks as soon as you hit the gas because in that case the torque converter is not slipping at all, so the engine RPMs need to increase a bit before you feel anything. I think lockup is only active at higher speeds. If it doesn't unlock you should directly feel torque from the engine, but if it thinks it might need to shift soon it will unlock.
It seems more sluggish when the engine is cold, but I can't tell for sure.
It really only pushes me into the seat if I start from a stop. If I'm rolling it's doesn't really have the same effect. Maybe it has to do with the torque converter. At a stop the torque converter is slipping, so it's making torque. If you are coasting along it is only lightly loaded, so the engine has to spool up a bit to get the input speed higher than the output speed of the torque converter. The lockup mechanism could make this worse if it unlocks as soon as you hit the gas because in that case the torque converter is not slipping at all, so the engine RPMs need to increase a bit before you feel anything. I think lockup is only active at higher speeds. If it doesn't unlock you should directly feel torque from the engine, but if it thinks it might need to shift soon it will unlock.
I believe this is what people are feeling. The trans downshift one gear at a time and it also detunes the motor for a split second while shifting. The purpose of the detune is to provide a cushier shift feeling during normal driving. Here's a video I took with me making it shift, and you get to hear Gertrude scream a little. lol
https://flic.kr/p/tdEKY1
P.S. How the hell do you get videos to show up on here instead of the link!??
P.S.S Don't mind the splatter of sweet tea on my steering wheel...I really need to clean my truck!
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blind squirrel
New member
op2:Nothing like no muffler! Lol
You need fuel....
Nahh! Another 80 miles in there! Lol
TotalAutomotiveLV
New member
Clogged cats??
I have an 03 4Runner 4.7 and a 06 Tundra 4.7 VVTI and my 4runner always seemed to have better off the line power.
I have an 03 4Runner 4.7 and a 06 Tundra 4.7 VVTI and my 4runner always seemed to have better off the line power.
Lol, it actually sounds better. I'll try to get a better video. Will enlist a friend to hold the camera
TORCH
New member
I guess mine does the exact same thing as yours. Also what kind of exhaust you running, it sounds ****ing mean on your other video in the mud.
EDIT: nvm. straight pipe...may have to chop off my gibson muffler haha.
I had Gibson catback but I took the muffler off and replaced it with straight pipe. It actually isn't bad, and it sounds awesome. Quiet at idle, gets a nice deep tone, and pops slightly if I really get on it. I'm loving it! Been getting a ton of compliments lately. [emoji41]
TORCH
New member
so when you are on the highway (like 65-75 mph) do you get a lot of drone?
Not really, it's about the same. It's slightly louder in the truck at times, but much less actual drone. You'd think it would be terrible, but it's not. I can still hear my tires, and they're not terribly loud either.
The video is not the best to compare to for a few reasons. First, people seem to equate loudness with being fast, but it doesn't work that way. Intake and exhaust mods might get you some tiny performance improvement, but most of the improvement is in the sound. Second, we can't see his foot in the video, so we don't get a sense of the delay between pressing the pedal and the transmission downshifting. That's one of the main things that makes it feel slow.
Finally, he's starting from 55mph, which is probably the highest speed where it will still kick down to 2nd (I think it's second). The result is instant power once it's done shifting. If you try the same at, I don't know, maybe 30 or 35 or 40 where 1st is just out of reach but engine speed is only 2,500-3000 in second, it won't be nearly as impressive.
Finally, he's starting from 55mph, which is probably the highest speed where it will still kick down to 2nd (I think it's second). The result is instant power once it's done shifting. If you try the same at, I don't know, maybe 30 or 35 or 40 where 1st is just out of reach but engine speed is only 2,500-3000 in second, it won't be nearly as impressive.
Lol, I'll make a new video. It's impressive no matter where I'm at. Also, remember that I'm running 35's and stick gears. Much better with correct gear ratio.
this is what you do. MAF sensor, fuel filter/pump, spark wires/plugs, trans. fluid, diff. fluid, check throttle cable tension, brake cable tension(might me to tight), clean throttle body, and tune to your desire. plus all cars should have the cat replaced or cleaned(only professionally-you don't wanna die) after a certain mileage for the performance aspect.
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