They guy at Autozone as well as the side of the can said you can put it in your oil or gas tank.

 

I wasn't saying it cannot be put in your oil I just said how would that help with what you did to your exhaust. they are not related at all but go ahead and put anything you feel like into your oil.
putting seafoam through a bad motor with alot of burned up oil problems on occasion will make it run better, but putting it through a healthy motor with no oil buildup would be doing it for no good reason is just going to cause more wear to stuff for no reason. I doubt your 98 vvti 1uz has oil sludging problems. If anything the only things on vvti's oil wise to get clogged are the vvti oil control valves have a screen that gets gunked up, but seafoam isn't going to help you there you have to remove and clean them or replace them to fix that.

now if you have a fuel system problem that could be related to your issue of hesitation or lack of power and then it would make sense to try a gas additive or fuel injector cleaner. Sea foam is like a last resort not a jump to it and putting it in your oil randomly is a good way to cause some bottom end problems if you forget about it being in there. its not worth the risk its not even your problem.

 

Hey, thanks for the tip, i did in fact just replace one of the oil control valves, maybe the other one is gunked up too....

 

UPDATE: Well, after having only driven a short distance after I first reset the ecu, I have since had the chance to really drive it a good distance this weekend and give it a chance to re-adjust, I guess. I also got a new air filter and put the sea foam in the tank. The powerband may have shifted up slightly due to the straight pipe perhaps, but overall, I think it feels pretty good. Before, it seemed to bog or rev slow between 2-3k rpms, but it seems to be better now, It never had much power at those rpms anyways, but at least now it revs in a decent manner to get to it's powerband more efficiently. It definitely "soared" on the freeway, that's for sure. It seems to be back to about where it was before the resonator delete or reasonably close so I think we're good for now. Thanks all you guys !

 

Mine makes a whole lot of power near that range. Something is still wrong with your engine worth investigating.

 

Uh oh, back to the drawing board.. About what rpm exactly do you feel the power coming on ? Mine is around close to 3k....

 

I spin 245/40 RE050A's all through 1st with just exhaust and running rich as hell. It's an NA V8, the torque is nice and immediate. There should be power starting from - at most - 1k rpms.

Low rpm issues....ignition timing off? How's the power at the very top? If it continues to build more power all the way to redline, the ignition timing too advanced is a likely cause. Could also make it take a little longer to start than it should.

That little bit of info on timing is general though, I don't know the specifics of how the 1UZ reacts to timing changes, that is based off of experience with 2.4 KA's and 4.6 Daim/Benz V8.

 

That's funny that you should mention timing because I was pondering that while I was at work. Is the timing adjustable ? It seems to have good top end. When I'm on the freeway, it just wants to go & go. But off the line has never been much to write home about. My dad even said as much when he gave me the car, sol I assumed that that was normal for this car. As the revs climb, then the acceleration comes on, but you don't really feel a burst of power until about 3000 or more..

 

Don't worry about your car, it's running normally. ArkLa's car is an older model SC without the VVTi on a 4spd auto. Our cars have VVTi and a 5spd auto which obviously has different gearing from the older models so you can't directly compare the two as far as power delivery. And once again, your ignition is no longer controlled by a distributor cap, it's all electronic. You can't adjust timing on these since it's all done via the ECU.

 

yeah there is nothing wrong with your car probably, its what normally happens when you reduce the back pressure. it feels like it looses power down low but it really doesn't. you usually gain some up top with easier revving and in comparison your off the line will feel slow, but hopefully sound good.

you cannot adjust the timing on any 1uz motor. let us get that one straight for the books.
even the older distributor 1uz's are non-adjustable. there are 2 "fixed" distributors and toyota fixed them for a good reason and that is so you wouldn't take back your broken engine to them when you try to change the timing on 4 of the 8 cylinders not realizing you would have to do the same adjustment on both or the balance of the motor will be thrown out the door, with quite possibly the crank if you give it enough time.

 

Yeah, that's pretty much it. You described it well. And yes, it does sound better, I can hear it for a change. it's still not loud, it could stand to be a wee bit more audible to me, but it sounds like a refined Lexus V8 that is breathing better.. And top end feels nice too, although I didn't get into the top end much before hand to have something to compare it to.. All I know is that it will cruise with ease with gusto on the hiway and breeze past alot of cars and will gladly go faster if I were to ask it to, but I have my limits, ha ha.

 

Yeah, it feels fine and healthy. Do you think I gained any actual hp from this or just sound and a possible shift in the power band ? I was hoping to get 10 more hp eventually to get to the 300 mark, but I doubt that this did it, but I could be wrong. Whattya think ?

 

Right, I'm still learning on the year differences. Sorry for the bad info. Though I am surprised the older A4 and motor go better off the line than the newer A5 and stronger VVTi motor.
Crank-wise, who knows. RWHP is what you actually measure on a dyno. I'd reckon you could gain that much up top with a serious exhaust mod on a V8 - but I don't know how restrictive it is stock.

Edit: Nice to know these dizzys don't adjust. More harm than good if it could.

 

I should make a video of it going 0-60 and slap it up on Youtube one of these days

 

Hey cool ! Thanks Mage ! I'll check this out, thanks for the tip !