Zombie

iTrader: (2)

So 1320 has been kind enough to free up some lift time for my car. We are trying out some new things this year with it. The biggest change is going to be the inter cooler piping. It's going from 2.25/2.5" to 3" the entire length of the car. The inter cooler itself is also begin swapped out from a 3" ebay core to a 4" ebay core. The exhaust piping is changing from header wrapped 2.5" to 3.0" ceramic coated and wrapped the entire length.

The reason for the change is I suspect once of the sides is holding me back. I suspect it's the cold side due to the small diameter and 400+ ft/s air velocity it's seeing. Figured we'd change the exhaust while at it too to eliminate it as a possible restriction. The combination of coating and wrapping should hold more heat than the old setup. I'm also going to be adding a turbo blanket.

The reason I think piping is holding me back is I have hit the wall with how much power I can make. I can't get the car to trap any faster than 136 mph no matter how much boost I put to it. It seems to run the best on 15psi which gets me 135mph traps.

A return style boost referenced fuel system is also planned.

The Zombie rear mount turbo saga part II will hopefully be posted in a 2-3 months after I have some time to collect data.

98Z28CobraKiller

iTrader: (17)

You did the quick spool valve, right?

Zombie

iTrader: (2)

yup, it's still on there.

98Z28CobraKiller

iTrader: (17)

Then I cant see any reason not to enlarge the hot side. By 700+ rwhp hp you are moving a good bit of exhaust thru 10+ feet of restrictive 2.5" exhaust. That's gotta backing up. Probably alot more than the cold side as pressure is pressure. Unless you are seeing a considerable pressure drop from the turbo outlet to the map in the intake. Easy to determine.

Zombie

iTrader: (2)

There is pressure and flow to consider. Figured it's best to do both. Upping the exhaust to 3" isn't a bad idea since I'm running E85 and making even more exhaust than a gas car.

2nd Gen Fl 'bird

iTrader: (13)

Cheering you on Bro!!!!!!!!!!!!

reamo04

iTrader: (9)

zombie, this is funny that your changing some stuff. I was just talking to josh at KYTP about quick spool valves today, and used your car as an example.

ninetres

iTrader: (35)

Not in the budget to front mount it?

Zombie

iTrader: (2)

Stay out of my threads.

reamo04

iTrader: (9)

why front mount it when his setup is working amazing?

elias_799

iTrader: (8)

is there a particular reason why you seem to stay away from front mounts ?

the guy just asked you a question, if you do not want people asking you questions do not start a thread

reamo04

iTrader: (9)

but i dont think the budget is the question. I can build a front mount ls1 kit w/ s475 for under 2 grand. Zombie has well over that into his, and its a very well proven setup (10.001 on a rear mount setup with more room to grow).

Heck, his is probably the easiest plumbed turbo kit on here that performs well. No cluttered engine bay, no crazy underhood temps, and it performs great. What's there to critique?

ninetres

iTrader: (35)

You serious lol? K.

Zombie

iTrader: (2)

If you just want to cause problems, yes. If you want to contribute constructively you are welcome to stay.

OUTLAWZ RACING

iTrader: (9)

Zombie can u try it out with just the upgrade intercooler and pipes first? Im looking for the results. On mine it was three inch after the final tune so i have no data.

2nd Gen Fl 'bird

iTrader: (13)

This rear mount saga has most likely turned into a personal competition with himself(Zombie). The curiosity an R&D of the whole concept is why he's doing this, if I had to guess. If he wanted to run 7's, he'd build a tube chassis car with a big 'ole honkin turbo on the front. HIS FOCUS IS MAKING A STREET CAR WITH A REAR MOUNT FAST, all the while doing this "above the clouds" in Vegas. Keep up the info Zombie.

mike13

iTrader: (27)

Zombie are you running a 3" midepipe right now? I have a convertible so I had problem tucking up the intake tubing I went with oval tubing just a suggestion if you have problems finding room for the bigger tubes.

Casey2323

iTrader: (14)

do you still run dual 2.5" Pipes off the manifolds?.. I have allways run a 3" charge pipe so i cannot compare.. what type of IAT do you see?

ninetres

iTrader: (35)

I wasn't trying to cause problems. Just constructive criticism. I think you will only see a minimal gain with the mods you are doing. I know your spool valve has been working well but it seems to me all of the bigger piping will add some lag time. I don't see the 4" IC making a world of difference, maybe a TAD.

I just think for the money you are spending on all of the metal and IC, you could fab a front mount set-up and yeild better reults in the end. I've never seen the SX80 in person so maybe it would be a bitch to fit up front.....not sure.

I know you are concerned about streetability, but are you still opposed to changing gear? That would yeild instant results far greater than pipe size. Maybe try a 3.25. Still low RPMS on the highway, and you will get to use the 1:1 ratio of high gear......putting ALL the power to the ground that your car is making.

Zombie

iTrader: (2)

Sorry, all of this is being done at once.

My entire exhaust is 2.5" from manifold to turbo. We did it as an experiment in reducing the surface area of the exhaust piping to help keep heat in. Even without wrapping it, there was a significant reduction in spool time.

New setup is 3" everywhere unless 1320 does 2.5" off the manifolds when he fabs up the Y-pipe.

On IAT's at the track I'll typically see 100 at the starting line after a burn out and 140 at the end of a pass. In the summer when it's 100 ambient I can see a 50+ degree rise in IAT on a pass.