cool with the leaks. lets see if it still does what it did before at high speeds. the stock evo 8 will hit 20 psi peak and drop to about 16 by redline.

 

both front axles are new, could be the rears a guess but theres no play in them from what i can tell and no turning involved back there

 

ill take a look but i dont see the new front axles being an issue, they clicked in and slid in smooth

 

yup waiting for some dry pavement well see if the rain lets up any time soon, did some 4th and 5th gear pulls this morning seemed good thus far

 

car is running great,
no more wobble issues

I feel the " wobble " was indeed the bad boost leak i finally found in those injectors and throttle body seals

HOWEVER the bad motor mounts def magnified the vibration, after every mount that went in the car the vibration intensity became less, the combination of the rear mount and fixing all the leaks has made the car smooth and consistent in every aspec of driving

car idles smoother, shifts smoother, pulls super hard

seems like the pulls are inconsitant power wise
so i did a seafoam treatment sucked in through a vacuum line and smoke tested the entire street ha ha, about 50 miles later cel came on and pre cat o2 is reading as none responsive, figured that might be the seafoam fogging it so i cleared it out and will see if it comes back

thanks for all the help guys, appreciate the responses and guidance

 

hmm, i forget where but i heard a bad front o2 sensor can cause some power loss also. anyway, im glad your car is back to normal. i suggest getting a tune, it will run even smoother and pull harder.

 

ya leaning towards that front 02 to be changed here soon,
tune will come at some point as well -- darn feds want more money for the taxes so itll have to wait but i can afford an o2 for now so that ll go in once i get her ordered

 

IM BACK, with the same darn problem ,

ok so its still doing it

getting sick of this so i just installed new plugs ( the old ones were only 5k old )
bkr7es coppers gapped to .026

while i was in there i did a warm compression test and found some interesting results

new compression tester btw

1 2 3 4

163 158 165 145

so ya those numbers kinda concern me
battery wasnt low on juice either on the 4th cylinder had the jumper pack hooked right up to her and she was cranking strong
would like you guys to weight in on those numbers pretty sure 10% is max variation i should see on a healthy motor -- shes not burning oil but this may very be my vibration when shes full throttle

also would like to know how to do a fuel pressure test if some one could reply with a link on how to do a test with our cars that be great -- ive read i should be seeing 38.5 psi at idle with the vacuum line off

thinking that once i cleaned up those boost leaks she was fixed and as of now 5th gear pulls are still clean 2nd 3rd and 4th when the rpms are higher wobble returns

thinking the only reason 5th is clean is because she doesnt really go above 4000k rpms because id be halling rass and its to darn slick out for that right now

plugs i pulled were a little white on the tips not terrible

anyways the saga continues one of these days she ll run right

 

Those compression numbers are fine. I had a motor with 60 in one cylinder and no wobble at 430whp. Still fast as hell it just idled bad, stumbled a lot off idle, and had a ton of blowby.

 

Torque steer?

 

ha id imagin that idle was rough

ok well how about leaning out and fuel issues? anyone have a good link for fuel pressure hook up and testing, id say id change the fuel filter to see if that fixes my problem but its in the tank right?

 

I had it adjusted to 1200rpm. When I put the new motor in it idled at 2000 setup the same way! Hahaha.

 

yes, try the fuel filter. well, since you will be in there why not get a walbro with the install kit. it will have a new filter for it. with a walbro you might run a little richer than before. but, i dont understand how your plugs would be white(lean looking) if you are on the factory tune. the stock tune is rather rich.

 

Did you ever check into the balance shaft being out of phase?

I have a 13 Sonata with this issue or at least VERY similar. I suspected it was from lowering the ride height too much as it started with coilover install and seemed to get better with taking the front ride height up a little higher.

My drive shafts coming out of the tranny were on too steep an angle.

It would sometimes pull smooth seemed after making a RIGHT turn or certain turns even to the left. Something moving around in the drivetrain though and I have yet to figure it out other than assuming coilovers and angle of the axles being too steep.

I hear the Sonata internal balance shafts are garbage and cause issues. Curious because I'm not very mechanical and hoping in the spring when I can get under the car, I'll raise the suspension and see if it cures it. I did check the output shafts coming out of the tranny and they were locked in nice and tight. Checked the hubs/knuckles/cv and everything seemed to be fine.

It's an AT - hoping it's not related to that.

I'm following along hoping it will give me some insight to my issue.

 

ha ya thats a slight difference id say


so did a search on rear axles and couldnt find dick

literally nothing am i going oem on this one only?

any body got a link for a rear axle or two?

I feel like this hop/ wobble is coming from the rear maybe ( god im guessing at this point ) however its temperature dependent -- the colder it is out the more hop i get almost like a cv joint is binding under load