Exhaust ? on a 86 turbo z t1

[scarface1689]

Would it be better to go with 2.5 inch exhaust all the way to the back with no muffler or cat or should i go 3 inch and would either choice have any effect on my turbo spool . my car is basically all stock Thank for ur time

[BadAssPerformance]

Depends on your HP goals and local noise ordinances

You want to make more power down the road, go 3" so you have to do it once. If its a mild build cruiser, 2.5" is quiter. Either way I recommend a muffler, a nice straight thru like a Dynomax race magnum oval or a Magnaflow give it a nice deep tone

[scarface1689]

This car is my daily driver at this point i really dont have any idea idea how much horse can be pushed from a t1 but later on down the road i was gonna get a stage 3 cal for fwdperformance and where i live no ordinances or emissions

[Darkapollo]

I'm going 2.5" on mine, but it is t2 and no major performance goals other than nice day cruser

[turbovanman²]

Go 2.5 inch and then go read this site, turbo database, a few hundred times- www.thedodgegarage.com

Going larger on a turbo car will not hurt spool but the opposite. The larger the better, this isn't an N/A car, the rules don't apply.

[Darkapollo]

Going larger on a turbo car will not hurt spool but the opposite
Now the question remains, how fast can you over stack the log manifold with boost before you get compressor surge??? :lol:

[scarface1689]

will i get any compressor surge with the 2.5 inch and the stage 3 cal because like i said the car is basically stock and is my daily driver . the only things done to it is colder plugs and k&n drop in filter does anyone one know what type of power i can put down with the stage three cal and how much power can be pushed from a t1 without and intercooler

[turbovanman²]

Now the question remains, how fast can you over stack the log manifold with boost before you get compressor surge??? :lol:

Oh, good one, :hail:



will i get any compressor surge with the 2.5 inch and the stage 3 cal because like i said the car is basically stock and is my daily driver . the only things done to it is colder plugs and k&n drop in filter does anyone one know what type of power i can put down with the stage three cal and how much power can be pushed from a t1 without and intercooler

Not sure, but Gary from Portland is running 14's with his, so that's probably around 200 whp.

[scarface1689]

is that a pretty good number for these car i dont know if i mentioned this before but this is my first tm what exactly is comp surge

[Darkapollo]

Its really good for a log manifold. Hands down the WORST designed manifold in the world.
Compressor surge is when the air going out of the turbo has no room to go but back in where it came out. It is said that boost will start to stack up in the log manifold after about 15 or so PSI, meaning that there is too much air available for the engine to ingest and the pressurized air has no place to go so it starts to back up and find a new place to go. On the T1 log that place is back out the turbo housing, causing the compressor wheel to start spinning backwards, or at least forced to slow down against the turbines wishes and all sorts of bad things happen. It will destroy the bearings, cause the impellers to vibrate and hit the housing, and obliterate the turbo.
You have to be very dedicated to the log manifold to try for more power out of one being set up as stock. The Logic Module (LM) in the log T1 cars is set to have cyls 1 and 2 PIG rich because they get the most air and have problems controlling the AFR.

Anyway, if you are leaving it alone (ie, no performance upgrades) Id go with a 2.5'' exhaust. It breaths well but wont allow the turbo to breath well enough to produce too much boost.

[scarface1689]

ok thank u no performance upgrades yet but i do i have a t2 swap for later on down the road it will be fully ported and have the two piece intake to go with it . how hard would it be to put in the z since u have one

[Darkapollo]

I did a t2 swap on mine.
You need to change a few things.
Throttle cable is not compatible, you need one for a later blow through TB.
Need to get a new cal for the computer OR the wiring harness and SMEC for '89 OR an 87 T2 computer which is kinda hard to find. Eventually Im going to swap in the SMEC since they are much more common then the 87 T2 Logic Module.
If you can find it, the wiring for an 87 T2 has the external MAP sensor which is much better then the one inside the car, plus it is upgradeable. It also has the 3 wire TPS and 4 wire IAC plugs which you would have to add if you left the 86 harness in the car since it uses different sensors.
Dont forget the RAD/IC combo with lower hose!! Direct bolt in, and its far better then no intercooler at all.

[scarface1689]

can i ask a favor do u know how to post pics so u can see what i am working with i can send the pics so u can post if them if u could

[Darkapollo]

First upload them to a place like PhotoBucket
then copy the IMG code that it gives you and paste it into your post.
It will look like this (change the {} symbols to [])
{img}http://i384.photobucket.com/albums/oo288/kheldarq/PICT0122.jpg{/img}

[scarface1689]

ok thank you

[scarface1689]

http://i849.photobucket.com/albums/ab55/scarface1689/turbo%20z/26526_1311092669220_1587728771_735055_2155344_n.jp g

[scarface1689]

http://i849.photobucket.com/albums/ab55/scarface1689/turbo%20z/26526_1311092549217_1587728771_735052_2855831_n.jp g

[scarface1689]

http://i849.photobucket.com/albums/ab55/scarface1689/turbo%20z/26526_1311092629219_1587728771_735054_3941593_n.jp g

[scarface1689]

think a t2 swap is possible with this

[Darkapollo]

Of course! I did it on my TurboZ

[scarface1689]

do u do powder coating oh do u know of anyone who has ever t3 one of these cars

[Darkapollo]

Yes I do and I have a friend working on a t3 swap in his 84. That is much more in depth than the t2 swap. A lot more expensive as well. You need the complete engine, wiring harness, computer, and different mounts.
Aside from the wow factor, I feel it is not worth the effort. Parts are rare and very expensive.

[scarface1689]

very true i was just wondering if it was possible but got bad news i was going to work today and for some reason i blew a dam freeze plug right out of the back of the block

[Darkapollo]

ouch... well the car IS 24 years old..

[scarface1689]

ya hopefully will be fixing very soon this is daily driver

[csomni]

on that 2.5 in ex do you recomend useing a 2.5 in sv or can you open up the 2.25 thats all ready on there

[Darkapollo]

the 2.25 actually has a slightly smaller flange so a 2.5'' down pipe doesnt bolt up properly. Ive notched them before to get the bolts to go in right.
You can get the 2.25 CLOSE to 2.5, but it starts to get a little thin.

[scarface1689]

thats good to know i was wondering the same thing lol

[Spraynlog]

Not sure, but Gary from Portland is running 14's with his, so that's probably around 200 whp.To be fair, I modified the log intake so I could put an intercooler on it.(Ford Probe IC from the JY) Best time on pump gas was 14.45 on street tires. I have put a 2 1/2" downpipe on the car too, it gave me about .3 in the 1/4 mile.

The better & easier way to do things with a log is to put in some +20 injectors and run it on E85 fuel. 105 octane, and cooler burning, I'm thinking 15 lbs of boost W/O an intercooler is doable. My best pass on E85 was 14.16 @ 94 mph. It ran consistently 14.25-14.35 depending on traction. The stuff is still only $2.33 a gallon here.:nod: By the way, I've run E85 for a total of about a year with no problems. I did replace the fuel hoses with flex fuel compatible ones from NAPA. I have a stock replacement fuel pump from 5 years ago in the car.