93 R1

Lag is a relitave term. I rode in Vosko's T78, which is considered a big turbo, and it was VERY streetable. I honestly felt it was almost as responsive as my non-sequential stock turbos...but with way more ***.



After that I decided I'm going bigger...like t70

TYSON

Not necessarily. Here is a GT35/40. The GT35 turbine uses a T3 sized housing, while the GT40 compressor is T4 sized. You can see how much physically smaller the GT35/40 is than the T78 next to it, which in this photo definitely looks like the compressor is bigger than the turbine. Of course that doesn't mean a TD07 compressor can't be physically bigger than a TD08 turbine. I know someone who has both T78 and T88 sitting around, I will have a look.



Rotaries do use a pretty big turbine compared to piston engines, though.

93 R1

I'm gonna have to agree with TYSON about the GT35/40. It uses a T3 manifold so the turbine is definately smaller

vosko

i've been wrong before and i will be wrong again have no fear. i was just assuming. thanks for the info

Mazdabation

Tyson......

Thank you very much for your second post. I found it a lot more informative then your first (actually a did feel it was kinda rude, just a bit HAHA)



The reason in my case for asking is because as i have stated, I know down the road my car is going to need the typical work from detonation. For instance when I had my T11 the motor was fine for the first two years, then one day I was racing a Z28 and....BOOM she went. I had to replace the motor and turbo due to the apex seal taking out a chunk form the turbos fin. Right now my FD is running fine, but I do like to grab things that are at good prices when I see them. If I stay twin and see a nice Efini Y pipe I can grab it. If i go single its no good to me.



I totaly understand what you are talking about when it comes to peeps pretending to know all, but in turn really know jack ****. Thats why in this post I am asking peeps to tell me there setups in great detail.

I dont want this to turn into a big battle of what is better, but more an sight to the different setups.

This way by finding out peeps out look I can make a decision of what suits me best.



For me any of my 7's have been weekend cars, for boyz and there toyz type fun. So as for ill mannered it doesnt matter to me. The only thing that i will change form my FC is exhaust loudness. My FC had 3' Saber exhaust straight through, no cats. So this time around I will go with a RB cat back probably.



How much horse do I have to have....as much as i can get HAHAHA. But really I want something that pulls hard at highway speeds, so I can some what get the feeling my bike gives(i know its not the same but I have seen an FD pull a bike on the highway before)

yet I want that light to light *****, like an aprox low 12 high 11 1/4 mile.



I dont want a pre-fabricated kit because if it is not enough I dont want to have to pay again to up grade.

For suport of this system I will be going with the V-mount from rotary Extreme.



Oh and now that i just realized your from london, I have just made you my new best friend. You can teach me what ever you you think you might now HAHAHA

Thanx

Shawn

TYSON

For modding an FD for power, it is probably best to have a plan, instead of picking up things just because they are on sale. You've probably seen people talking about how many changes you can make before buying an ECU, etc. You drove your TII until it died, doing that with an FD will cost a lot more. The turbos are $7000 CDN, just ask your Mazda dealer. People also charge a little more to rebuild an FD motor.



You make a good point about buying a kit and then having to start over if you want more power. However, you have to ask yourself if you will ever buy race gas. If you don't see yourself ever shelling out the big bucks for race gas, it looks like you really can't go wrong with the GT35/40, or GT35R as it is called around these parts. 400+ HP @ 15 PSI, snappy response, etc. The problem may be that if you ever DO decide to get a bigger turbo, you have to throw away your manifold, because it is made to fit the small T3 flange on the GT35R. An advantage of the GT35R is that it is physically small, and it should fit easily with the intercooler you mentioned.



One big problem that weighs against the upgraded twins. Quite often by the time your stock twins fail, (or long before) the exhaust inlet casting begins to crack. If you plan ahead to buy one of these and find your exhaust housing is badly cracked when the day comes, they might not be able to rebuild your turbos. You then either have to find a decent set they CAN rebuild, or you have to go the single route anyway. This is what happened to me. I had to sell my M2 airbox and downpipe at a pretty big loss with only limited useage.



BTW,



If you thought a TII with a 3" canister exhaust and stock turbo was loud, you are in for a rude awakening. You ain't heard nothin' yet. A single turbo FD with a 3" canister exhaust and wastegate open to the atmosphere will be louder, guaranteed. Your car will be able to pull 600cc and maybe 750cc sportbikes on the highway by this point, so will you really care?

vosko

i love my open wastegate.... i have some videos of it. it is LOUD

TYSON

What exhaust setup do you have Vosko? Pipe diameters, cat-back, etc...



Mine is 4" downpipe, tapers to 3" midpipe with HKS Carbon / Ti catback. The dump tubes from my wastegates are about 4" long and come out past the front suspension. It's pretty damn loud.

vosko

i have the greddy dp that came with the kit it's 4" or 3.5" i never measured it. 3" SS ATR MP. 3" Racing Beat Catback (old style black one).... i only have one dump tube that goes by the dp pointing down sorta. my car is loud at idle but completely bearable when i'm not on boost its loud but deep and throaty loud with some rotary rasp to it



when the wastegate opens up you can hear it probably a mile away...... i know my friends did at their house when i was driving around

Mazdabation

Mention a bit back was that the GT35/40 is "dual ball bearing".

Now what is this? I know it helps spool faster but how? This is one of the designs of turbos, what are the others(non BB, water cooled etc)? How do they differ.......

Shawn