[Euro] Hondata Update

[Merlin086]

Comments by James have caused doubt that concerns are justified, by throwing in the Vtec comment.

In all fairness, my car had a exhaust tip reading @.5m of 102db@4350rpm prior to the headers being spread, and now has a reading of 87db (checked by exhaust specialist)

As yfin stated..
Vtec is one thing, but harmonics and metallic vibrations are something else.

Don't be confused between the two for those who haven't heard the difference!

My final prototype system is due to be replaced with the production one later March, so personally I can't comment on the final product until my headers etc have been replaced. (Has been 3 1/2 months wait so far)

So personally, for my euro, it is only the slight harmonics that persist along with a metallic vibration @3.5-4k.

If these matters are sorted I will be a happy customer, if not, well, I didn't get what I paid for did I?...........hmmm

[Ozluder]

Yeah Euro owners can be fussy that is very true.

But paying $5000 for the extreme kit is a lot of cash! So people are going to expect that there will be no annoying vibrations or harmonics - or at least such complaints to be taken seriously. Anyway - I think the letter is a joke, it just implies existing customers are ignorant of the sound of VTEC.

I agree with Yfin.

I believe the Jtune Products are overpriced and the letter just shows the lack of professionalism from Jtune.

[Omotesando]

The harmonics problem at around the mid-rpm range is very common amongst modified cars especially with changed headers or bigger exhaust.

Not saying that it is alright for the JTune extreme package to have this problem but yeh it is apparently a problem for other cars too.

Its probably a resonance problem.

A lot of stock air intake systems have a built in feature to get rid of this resonance from the intake side as well.

[Pumped]

Jtune is a joke, 6-8 weeks was promised in october/november
All hope, if there ever was any is dead.

service is pathetic, he doesn't reply to emails and has not given any updates on why its been delayed or when the kits are expected to ship.
Ive heard more on this forum than i have on his own forum and from himself.

[tony1234]

After i got my Comptech headers installed i had a similar problem that you're having Merlin.it was a vibrating/resonance type of sound but it only occurred when i was sitting in traffic,idling with the aircon on.What my guy did to fix it was 2 things.1.relocate the mounting bracket near the cat so the rubber mount would exert some pressure on the exhaust system to reduce the vibrating,but i think the main thing that fixed my problem was welding the existing bracket that is attached to the engine block that supports the OEM headers to the Comptech ones.It's located where,on the OEM headers,go from 4-1 into the large pipe that then goes at 90 deg angle into the cat.It's worth a try,i'd be surprised if it doesn't fix your problem Merlin.It fixed mine.

[Suntzu]

I have the vibrating issue with air con on also. i have cheapy stainless topspeed headers. I might need to pm you about this.

My Mild flash is going ok. I havent reviewed it yet as I havent driven enough. Going pretty well tho.

[sodaz]

LOL at the letter from Jtune. They should spend more time fixing and testing their products instead of writing silly responses like that.

I've sat in the Jtune car and there's definitely some audible cabin vibrations and resonance in parts of the rev range. And this has absolutely nothing to do with vtec. I vtec on a daily basis and it's not the same kind of sound at all.

[Omotesando]

Well it seems like apart from the cabin noise, JTune has re-changed the exhaust dimensions to reduce noises as well.

I reckon with NA cars, unfortunately, any big changes to exhaust part of the engine will increase resonance or raspiness.

Turbo cars have an advantage in this instance as the turbo kind of muffles the increased noise and whatever vibrations it tends to bring.

[EUR003act]

from what **a certain company** has told me, and from what i know through personnel experience (RBC manifold for example)... im beginning to think (pretty much confirmed) that they may not have as much knowledge as they think... on multiple occasions ive been given incorrect information from what i thought was an expert... anyway, ive found a new expert (he knows who he is ) and he's no fake

[wynode]

since changing to my RBC intake now with SRI im getting a slight vibration/drone from 2400-2600rpm... in every gear when more than 20% throttle at first i liked it, now its annoying, especially since 102km/hr in 6th gear is smack on 2500rpm... im working on changing the iintake/positioning soon

Just keep in mind that removing the factory resonator will cause this. It's there to tune out standing waves and if your remove it....you will get a droning effect under load.

[EUR003act]

Just keep in mind that removing the factory resonator will cause this. It's there to tune out standing waves and if your remove it....you will get a droning effect under load.

nah its a completly different sound to that... and i didnt get it with SRI or CAI on my RBB manifold... nor with CAI on RBC, its only when using SRI on the RBC... so ill have to look into it further thanks tho

[BiLL|z0r]

Just keep in mind that removing the factory resonator will cause this. It's there to tune out standing waves and if your remove it....you will get a droning effect under load.

I've done this and it's a great sound and not what I'd call annoying. I've sat in Merlin's car to/from Brissie and it's down right annoying. This was before any of the latest changes though.