76 replies to this topic

[Bart]

I want to keep it Holden, I think a 253 with RX7 Turbo Chargers, or RB20 Turbos could work aswell?

Obviously I'm not able to talk from experience as of yet, but i'm sure someone here can inform me.

I think to keep it simple just use the stock exhaust manifolds but swap sides, left maifold go to right and right go to left side of the engine/heads. This should make the outlet of the manifolds face forward where you attach piping and turbos.
Or fabricate extractor style turbo manifolds.
You can get Jap turbos fairly cheap with internal waste gates.
Make sure you can squeeze the exhast pipe from turbos between the block and cross member you donr want to under cross member, they hang like dogs balls.
Did you want injection or carby?
What gearbox you want?
Wgat diff?
You need to upgrade brakes at least the front
I think youll have to change pistons and rods
Whats your budget?

Edited by Bart, 09 November 2009 - 09:01 PM.

[mr5000]

copper head gaskets wouldnt hurt either something with that much grunt id be going 9 inch and depending on whether you want auto or manual as to what box

[Struggler]

Here are some pics of a turbo 308 I did about 8 years ago. Sorry, no pics of it all together running but this will give you a few clues.

Also the Series 5 RX7 turbo with a TO4 comp wheel inside the standard cover would be perfect for a 253 IMO.

 turboout1.jpg   270.39K   213 downloads
 turboout2.jpg   263.18K   249 downloads
 turboin1.JPG   353.93K   250 downloads
 turboin2.JPG   306.84K   218 downloads

[Bart]

Here are some pics of a turbo 308 I did about 8 years ago. Sorry, no pics of it all together running but this will give you a few clues.

Also the Series 5 RX7 turbo with a TO4 comp wheel inside the standard cover would be perfect for a 253 IMO.

 turboout1.jpg   270.39K   213 downloads
 turboout2.jpg   263.18K   249 downloads
 turboin1.JPG   353.93K   250 downloads
 turboin2.JPG   306.84K   218 downloads

This looks like a nice simple seup
I remember this, what happened?
It would be good if you can use VN heads on the 253 to get it breathing better.

[Bart]

I want to keep it Holden, I think a 253 with RX7 Turbo Chargers, or RB20 Turbos could work aswell?

Obviously I'm not able to talk from experience as of yet, but i'm sure someone here can inform me.

I think to keep it simple just use the stock exhaust manifolds but swap sides, left maifold go to right and right go to left side of the engine/heads. This should make the outlet of the manifolds face forward where you attach piping and turbos.
Or fabricate extractor style turbo manifolds.
You can get Jap turbos fairly cheap with internal waste gates.
Make sure you can squeeze the exhast pipe from turbos between the block and cross member you donr want to under cross member, they hang like dogs balls.
Did you want injection or carby?
What gearbox you want?
Wgat diff?
You need to upgrade brakes at least the front
I think youll have to change pistons and rods
Whats your budget?

Everything is up in the air at the moment, probably make it manual, 5 speed celica gearbox; if it can handle it.
Not sure about injection or carby yet, tossing it up, I suppose injection wouldn't be a bad idea, although do turbos run off an ECU? If it does i could get a ECU for the injection/turbos/sensors etc. Undecided on that one.
Diff unsure yet... waiting on some advice from you's to help me out.
I plan to do a full overhaul on the brakes, probably put HQ rotars all round.
Piston and rods; plan to do an engine overhaul so that will come with it.
Budget: 4 years of money that comes my way; so pretty much take it as it comes.

Cheers
Josh

The turbo boost is normally pressure controlled which activates the waste gate. I think I got that right
You can have the boost controlled by ecu and solenoid, but the internal waste gate you get with the RX7 turbos can be left as is, i.e. pressure/pneumatic control waste gate
You can use HQ discs out front, this would be required by an engineer as you need ventilated.
The rear you can use a VN diff with VN discs
I think an ECU controlled engine would be less temperamental than carby/turbo setup. And nicer to drive. I think.
Piston and rods, probably you have to know what hp you want.

[Struggler]

This looks like a nice simple seup
I remember this, what happened?

I was never happy with the lag (the turbo was a second hand truck unit and a bit big on the exhaust side) so bypassed the intercooler one day and rattled a piston to bits, split a bore and basically messed it up. I pulled it all apart and someone purchased the lot as it was. Never saw it again.

[dattoman]

I would guess that would be a plumbing nightmare

If you size the turbos and get your comp ratios right and run sensible boost then lag isn't an issue

[Heath]

Sequential turbos on a V8 would be a plumbing nightmare. You can get away with it on an inline four or six more easily, or a rotary, but yeah not a V8 in a Torana engine bay

[dattoman]

A big single will give you boost... but lag more than 2 smaller ones
As suggested... extractors turned over to put them facing forward... 2 tubos strapped to the front.Plenty of room for pipes then

[dattoman]

Holden V8
2 turbos

whats not relevant ?

[Bart]

A big single will give you boost... but lag more than 2 smaller ones
As suggested... extractors turned over to put them facing forward... 2 tubos strapped to the front.Plenty of room for pipes then

Can you show me how the 2nd picture is relevant... excuse my ignorance but I can't see what it is in relation to what we're talking about lol.

the first one is injected turbo
the 2nd one is blow through carby turbo. Looks like a 4 barrel.
The previous post on using extractors and mounting them opposite sides i thought was a good idea, but the wall thickness on extractor i dont think are thick enough, the extractors/manifolds will get red hot with turbos. You should use 3mm wall steam pipe.

[Heath]

Honestly what's wrong with log manifolds? I wouldn't go for extractors in that setup personally.

Would go straight LPG with the standard pipes, low boost and no intercooler probably, and yeah just some random OEM Jap turbos

[Heath]

Registering a car with modified wheel arches is a pain I believe. Normally people try and avoid it because it looks tacky and isn't very good for power amongst other things on EHs etc when they put Chevs in them, but that's on N/A - with a turbo, neither of those rules really apply. I still don't think it's something you really wanna do

[dattoman]

Have another look at your wheel and ask that again
usually you have to mod the footwells to fit any decent rubber in there so no idea where you would run pipes

Logs , extractors , stock cast manifolds.... its just ideas thrown around atm