I have a JWT TT kit on an 03 G35 with stock cats. I was looking to upgrade to hi flow cats or test pipes(no local emissions testing). But I have heard that the seals on the turbos need back pressure to seal proper and going with test pipes or hi flow cats my cause oil consuption issues? What is everyones experience what are you running and any oil consuption issues?? Also what is the exhaust tone like I have a Stillen true dual set up and it is quieter than stock after TT install will hi flow cats or tp give me better sound? Thanks in advance. Please only reply if you have a JWT TT kit or experience with the kit.

 

I am assuming you have the 530bb kit that comes with the spacer plate.If so you will have the above stated problem.Cats will usually cover the problem up.To correct it you will need to tap the oil pan assembly about half way up on both sides.This will drain the oil properly.(This is for the oil return from the turbos to the pan assembly)As for sound i don't like the stillen exhaust period.

 

^+1 seems to be an issue on revup engines.

 

Go With The Ken.. Test Pipes Work Great And I Have No Oil Cons Issues Whats So Ever

 

vq, i've got the 700bb kit going in - with hfc - is this a problem with all jwt tt kits that needs to be corrected? I don't understand what you mean by "tap the oil pan assembly" to allow proper oil return drainage. I don't have the revup (04.5 g35 coupe). Not sure why only the revups would have the issue...

 

Out of 5 kits I have only seen one with such a smoking issue and it happened to be a revup, apparently the exhaust pulses are different and create the issue, maybe since it has the exhaust timing which the nonrevup doesn't.

As for the oil return it is suggested to tap into the upper oil pan rather than use the lower points on the oil pan spacer, this will allow for better oil return from the turbos and help with this issue, if you have a nonrevup I wouldn't be concerned.

 

03 model years are the best, they respond well to FI mods better for some reason, seen it plenty of times from the 38+ cars that we've done...

as far as OP's question.... put the TPs on it... itll be much better and also give you're exhaust a lil better sound... we havent had an 03 have any oil cons. issue with the TPs that we usually install with the kit.

 

Thanks guys good info I was leaning to the test pipes. Anyone else have experience with this.

 

So, are you saying the 03 doesnt need the backpressure as much as the rest of the years for FI? Does this or any other kit need backpressure or not, I have heard differing theories on this and have wondered what is the better way to go?

 

With my own personal experience, the turbo seal issue it true with some cars. I have a rev-up engine and I had this problem when I first installed my JWT kit. I had test pipes and my car smoked like a ****! I called Jim Wolf himself and discussed the issue a few different times. In the end he told me to put the stock cats back on due to the back pressure needs of the turbo seals. I put the cats on and the smoking went away, as did some of my horsepower. I got tired of running cats so I took my car to a shop to have some oil drain holes put into my upper oil, above the oil level so the turbos will drain oil more efficiently. No more smoking after that. If you have a non-revup engine you will probably be just fine with your oil draining in through the JWT pan spacer though. Good luck with it.

 

thanks westpak (btw got the TT emblem - looks awesome) and Alex for the responses.

I don't understand why positioning the oil return line against gravity will assist in drainage though...

 

Because the resistance to flow caused by trying to flow the oil out of the turbo into a pool of oil is greater than making it go a little bit uphill and drop into air then down to the pool of oil.

Of course I dont know if the JWT turbo's are low enough that when you tap into the upper oil pan the oil path goes uphill a little bit or not.

 

well that makes sense - thanks shushi.

 

navygolf, to be honest with you... out of 20+ JWT TT cars that we've done, it has only happened 3 times, an 05 G (revup), 06 Z (revup), and an 04 Z very recently... we suspect that the cars had oil consumption/burning issues from the factory but i really havent heard back from those customers...

 

Jim Wolf told me the same thing but I went with test pipes anyway. I'm an 06 Revup and I've had no smoking issues. I tried HFC for a little while but could really feel a loss in power so I put the test pipes back on.

I have the Injen 60mm exhaust w/h-pipe and it did become a little too loud with test pipes. I had the middle resonators removed and replaced with a perferated x-pipe muffler and its perfect now.

Hope that helps. Good luck.

 

you should really think about getting rid of that exhaust... you can pick an easy 20+whp, the last 7 cars we switched out to GREDDY EVO TTs... the perfect exhaust for TT'ed cars for sure... last one went from 373whp w/ a borla exhaust up to 403whp on the Greddy TTs

 

I agree about the exhaust. Right now I need to figure out why the car takes 5000 rpm to make 9lbs of boost. I think the 06 ECU has gremlins.

 

+1

 

on my EVO2 exhaust, i cut the x pipe out and it got me 2 pounds of boost!

 

Portugee... seems that way, cause we've TT'ed two 06s recently and they have been running perfectly fine. dont know what the heck is going on, i know that one of the 06s needed some finetuning on the SS box though.