Guys, after researching stock exhaust dimensions, for instance, stock VG30DETT turbine outlet & dump pipes being 2", I'm wondering why you would bother putting 2 1/2" mid & tail pipes on? I heard it increases HP but, do you leave the pre-cat pipes 2" or do you open them up before the cats? I just wanna get this right before I go ahead doing bolt on mods prior to a good dyno tune. Btw, the post cat pipes are already upgraded to 2 1/2" from previous owner. Also, noted tonight it states on one of the under bonnet manufacturer stickers to use high octane fuel. Why would you when engine is low comp? Obviously 95RON is cleaner than 91 but, again just want advice from Zed owners. Remember I'm new to the Zed Any advice would be great
Ideally you'd do the entire system rather than just from the cat back, but it's whatever you can afford really. Bent pressed piping vs mandrel bent piping is the big difference, the diameter can get pretty narrow in some sections of press bent factory exhaust systems.
Thanks for reply, yeah no doubt mandrels the way to go & sure, exense is the deciding factor but, 'expense aside', was just wanting to clear up if it is worth it to do the 2 1/2" pipes on a Zed?
Yep, if money is no option you replace everything from the turbo back, not sure if new exhaust manifolds will give you any gain with stock turbos and boost or not but again, if money were no option you'd be upgrading them too. Regarding the high octane fuel, a TT zed has low natural compression but once the turbo starts forcing air into it the effective compression gets pretty high, hence the high octane fuel, ideally 98.
Thanks for the explanation. I wanted to steer away from heavy duty upgrades. Just get it perky prior to a decent dyno for now. I luv this car already just need trans looked @ due to it hesitating on gear changes & after getting front rotors machined & new pads, just doesn't brake well @ all. Crap to be honest. I thought these 4 pot calipers would be great? Feels more like it has drum brakes I'm not kidding Guess I'm starting to get into this Zed & want it right.......
With decent pads and everything working as it should the braking should feel pretty sharp even with standard brakes, I'd be looking at checking your brake fluid level and flushing and freshening that up first and maybe some new pads.
The biggest reason to upgrade the exhaust is to get BIG outlets and more NOISE It makes the car look and sound at least 100hp more powerful.
even cat back makes a nice differnce and those factory front pipes arnt made that badly anyway pretty sure there 2 and a quarter and mandrel bent factory
The best pads were fitted yesterday after the discs were machined. That's why I'm confused? I did consider the flush & will do it Monday Yeah, it sounds friggin awesome but......I wanted to know will it amount to more geegees? Well that's interesting. I wondered if the front pipes were 2 1/4" If so, that's enough for performance. I guess some 2 1/2" cat backs would be great then? Can anyone confirm the front pipes (dump pipes) are actually 2 1/4"?
Yes it will make a huge difference. Do you have a turbo z? if so then go for it, full exhaust, highflow cats and an x-pipe. /thread.
Yes it's a JSpec TT. Could you clear up what the "x pipe" is? Sorry. this is my first Zed, & TT for that matter Thanks
You can have a X-pipe or a centre muffler with 2 in 2 out, It just evens the back pressure in both Exhaust sides.
Thanks for that info. I've seen the mufflers you speak of that act same as an x pipe. All becoming clear
Arrrrrhh.... In the short term, assuming the system is fully BLED and free from any air, a fluid change will achieve NOTHING! NANA, NYET!Water in solution/suspension or whatever. UNLESS there is significant amount of air in the system, it will matter not if you filled the system with bloody red wine, pressure generated at one end will transfer down to the other end and you wont mysteriously loose pressure somewhere creating poor braking. However, you have just had disks machined with new (?) pads and Im not in the slightest surprised you are not impressed with braking performance so far. There is a good chance you have barely 50% pad/disk face contact until such time as the pads and disk surfaces are sufficiently "run in". This can take considerable amount of time if the machining job is done badly and the pads are not faced off dead flat. In fact braking abuse on new pads/disk surfaces can result in long lasting and very poor braking effect due to localised burning and subsequequent glazing of pad and disk surfaces which can take sometimes hundreds and hundreds of K's of hard but careful brake use to overcome. View fluid change as a precautionary measure to be done regularly due to the moisture and possible other contaminant issue but it is NO magic braking bullet IF there was no air in the system to begin with. Water will not compress any easier than brake fluid in the real world and will transfer pressure just the same. It will however, boil at very low temps, aerating the fluid and of course the system components will corrode. By all means wap you fluid and give your brakes time to settle down before getting all funky with them. Remember M8, its a subjective thing, what is crap braking power to you may be unbelieveable stopping power to someone else and vice versa. Give them time. L8r E
Proper off car machining was done by ABS & TRW high temp pads were used as recommended to be the best? I will take time to bed them in. No hard braking. I hope they get better as compared to my old V6 MX6 & wife's Commodore, they aren't a shadow the same. They actually feel like drum brakes If I had to pull up in a hurry, they wouldn't do it.
I fitted new rotors recently and i use Bendix "Everyday" 2 bob pads and the thing will near poke your nose thru the screen if you ask the question. I suggest you give them time to bed in. Then, push the pedal down hard and Im willing to bet the wheels will lock up or you will invoke ABS (if fitted) The Zed has a fair whack of pedal feel built into the system and requires significant pedal effort to do the business as youll find almost EVERY sports oriented car will be like. Dont mistake this extra pedal effort over a mums taxi for lack of braking power?? No? L8r E
This extra pressure needed was what I meant by "feels like drums" When it's registered I will take for a decent run & see if it improves. I'm pretty sure it has ABS too.
