Ever since I've boosted my truck Ive had this issue. I thought it might be transmission related but Im not sure. Basically unless i stomp on the pedal for a drag race the low end on this truck sucks. Im usually the last at leaving the light while trying to smoothly ramp up to speed, otherwise the videos below is what its like. So before i drop a lot of money on a 46re swap I need to figure out this issue. What do you guys think?
Video below is leaving from a light trying to ramp up to speed. When the revs go way up i let off a bit then gave it gas to speed up. I pretty much push on the peddle almost to the floor before ti responds.
Not sure what you are trying to demonstrate. You are in drive and I'm sure at part throttle the transmission is shifting to the next higher gear pretty much keeping you from making any boost.
Trying to show normal driving where i cant control acceleration without the truck taking off. When i let go of the gas trying to control my speed then it feels like im on a higher gear where the truck doesn't pull strong just lags. Makes for a crapy ride.
Couple weeks back i lost control of the truck in the rain and almost ended up in a ditch trying to get on the highway because of this issue. I havent found alot of boosted guys talk about an issue like mines. Is this a supercharger thing? Would going turbo remedy this?
Superchargers start making boost around 2800rpm
When boost starts coming in the engine accelerates rapidly.. this is normal. To control this rapid increase in power you need to control what gear you are in. You would see much more control if you manually shift the trans. The easy solution which I don't like is to replace the BOV spring with 1-2psi spring. This will keep you from making boost except when @ WOT. You can put the trans in drive and it will work normally, go wot and it will go boost like throwing a switch. Manually shifting you can hold your gears and have control.. with a 46trans with manual vb you have total control over what gear you are in and can load that gear eliminating the surge of changing gears and rpm jump.
Do you have the tow/od off? Something seems to be off with the rpm on the second vid. Idling too low. With a 2800 stall tc, it should rev up to 2800 rpm with no problem. It's looks almost like the tc lock up clutch isn't disengaging. Try driving it around with the tow/od off.
On the videos tow/od is on. I usually drive with it off and its a little better but not a whole lot. When it first takes off i let go of the gas and once i try to speed up again its lags.
I was having the same issue as the second video, but with turbos. On top of what you are experiencing, i had the additional problem where i would let off the gas (under boost) and the truck would keep on pulling for 2-5 seconds.
The problem appears to be in the tune. Keith looked into the tune for me, made some changes and so far the problem has gone away.
In the vids when you let off of the throttle, it looks like it went into over drive (tc clutch lockup). If it does the same thing with the tow/od off. Now, that would be a problem.
Usually turn off the od from cruising when want to accelerate in a lower gear. Never let the 545rfe trans down shift into 2nd prim with the od button on.
Have you tried to reset the running history and re-install the tune? Have you tried a throttle peddle set? Is there a bypass valve on that supercharger?
Yeah I've reset it and had the tune taken off and re installed and adjusted but its still doing it. I haven't tried a throttle pedal set, ive never heard of it. I do have a blow off valve
I was having a similar issue till I change my Turbo and went to an AR 115 on the hot side. and all of the surging went away. And I always have OverDrive turned off unless I am going faster than 50 mph. I am also running an electronic dual stage boost controller first stage is set for 10 lb but I can flip the switch and go to 15 lb.
Same thing happens with my Hyundai Genesis coupe after upgrading to a TD06Sl2-20G turbo, it drives smooth under part throttle up to 6 psi and then it just decides to take off like a raped ape straight to 20 psi, there's no in between, (go drive that in the rain) it's just the nature of the beast, it wasn't like that with theTD05-16G or the stock turbo, my tuner said i need an electronic boost controller to tune that.
My 03 was bad about going into wide open throttle, down shifting and going into full boost. The tune was for cruising or wot race. Was going around a slow rig on the freeway doing 78mph in the rain in overdrive. The 03 jumped into wot at full boost(12psi), down shifted and kicked sideways. Needless to say, I was very couscous when driving in the rain with the 03 after that. Don't have to worry about that happening on the 05. It has a smooth n/a to boosting up throttle response as long as it doesn't downshift... I still side on caution though.
Went to get an alignment today and the tech wasn't expecting the boost to kick in like it does. He ended up driving my truck into the bushes. I read through this thread a bit so would you guys say the fix is to go to manual trans?
Ok the tune could use a throttle adjustment sensitivity. But on a side note how fast was he trying to go in the parking lot? It’s takes a bit to get the throttle to do that you know this!
I was watching from the waiting room when he first went to get the truck. He drove it around the lot to line up with the bay. I noticed he kinda stopped then must of pushed the pedal a little to hard and into the bush he went.
When I got this SC kit I think there was a boost control or something like it that we didn't end up using. I have to dig it out to see what it was. Do you think using that will help?
I pull off the top of the Blow Off Valve if someone else (Shop) will be getting behind the wheel. Alan Wrench to loosen the clamp and off it goes. Move the Vacuum hose onto a bolt head near by. Glad he hit bushes and not someone or something that doesn't resist impact.
Rule #1 never let anyone drive your truck.. put a 1psi spring in the bov. This keeps the bov closed except when lifting the throttle giving a smoother throttle transition. Manually shift the trans so you can load the individual gears. When the trans blows up replace it with a 46re manual VB.
Typo... not 1psi. 10psi spring or whatever it takes to hpld bov closed at idle.
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