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Twincam or not to twincam, I have some questions. 

 

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 Post subject: Twincam or not to twincam, I have some questions.
Posted: Tue Jun 07, 2011 6:09 pm 
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So. . .

I am going to twin turbo my falcon.
I have an AU engine in there at the moment, but I would like to put in a BA motor (non turbo) and boost that.
However, after a long read on XR6turbo I found that most people who have boosted there NA motors are putting out about 200-220kw. Basicly because the compression the non turbo motors have is a bit too high to push much more than 10psi.
So in a round about kind of way, would it be better to boost an unopened AU motor OR fit a twincam with a decompression plate/two headgaskets?

I already have a haltech with 6 LS1 coils, so I will not be using the VCT in the BA motor, apparently this is really only used when cruising for fuel efficiency anyway.

 

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Tue Jun 07, 2011 8:48 pm 
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Troyman is getting 260+RwKw with a stock AU at 12lb boost. Turbo the AU and if it goes bang then look at the Barra.
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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Tue Jun 07, 2011 10:27 pm 
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Go twin cam.

You will need rods and pistons for more than 300rwkw in both. The Twin cam will do it without stuffing about with cams and headwork.

I'm at 280 on my AU motor and will still probably get a BA or put a twin cam engine in before rebuilding the AU motor with better bits.

You got your haltech cheap didnt you? Sell it and put a stock BA/BF ECU in. That's what I'd do anyway.
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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Tue Jun 07, 2011 11:31 pm 
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Yeah I got the haltech fairly cheap, but everything else is was made it an expensive exercise, thats why I would like to keep it.

My goal as far as power goes would be 240kw. I want to try something different (not that twins and BA conversions haven't been done before) more so than getting huge power.

I'm going to use a water intercooler aswell.

 

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ED HP AU XR6, Wade, T5, and all the usual stuff!

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Thu Jun 09, 2011 10:14 pm 
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It's all in the TUNE ...
A decent sized turbo helps keep cylinder pressures low also...
If the twin can fits easy use it...
Have two tunes if you can...
Race on E85 & ULP D/D....

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Fri Jun 10, 2011 12:40 am 
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Yeah I've read alot about generic/bad tunes causing the rods to fail, I trust my tuner though. :) I think what I will do is get a set of FG turbo rods just to be on the safe side.
I like the idea of a E85 tune, shame its a bit hard to get in my area. :(

 

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Fri Jun 10, 2011 10:10 am 
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I'd play with what you have, keep your total costs down for now.

AU motor is in and running so straight out you save the whole fitting the engine part, which would probably cost around the same as just turboing the AU motor.

Also you'd be on a well played field with doing the AU motor. Lots of people to help with tips, and a little less pioneering.

Figure the cost of the K frame, wiring, 2 cams, computer/chip etc.
Compare with the cost of turboing the AU..

Or, if you wanna be different... Supercharger!

 

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[color=#004080]Cheers, Jacob.

NA Fairlane Build thread:
the-garage-f53/my-fairlane-build-lowlane-t94891.html.
Also in the garage....
AU LTD, DC LTD, and Lowlane.

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Fri Jun 10, 2011 11:33 am 
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4LEDboy wrote:
Yeah I've read alot about generic/bad tunes causing the rods to fail, I trust my tuner though. :) I think what I will do is get a set of FG turbo rods just to be on the safe side.
I like the idea of a E85 tune, shame its a bit hard to get in my area. :(

fg xr6 rods are same as f6 rods,only difference are compression with pistons,ill double check with papa smurf, but part numbers are aparently same

 

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Fri Jun 10, 2011 11:41 am 
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Less pioneering with an au motor???

How many au motors are making more than 500kw? 2 or 3?

Dozens of twin cam motors are doing it and on stock cams.

The stock BA motor will make as much as an AU motor will. The compression is higher but the heads are better so they don't detonate as easy.

If you are going to build an engine the costs will be in Favour of a twin cam motor. They don't need head work or aftermarket cams to make heaps of power. The money you save there will get the k frame modded professionally and atomic cam gears with heaps of change left over.

BA motors are $400 at the wreckers so the initial purchase price is hardly worth mentioning.

I've thought about this a lot and unlike some I'm not guessing.

The au and BA motors use the same crank sensor. You could drop a BA motor in, fit your au throttle body and cable, run your ls1 coil leads to the BA spark plugs and it would run.

Lock the cams and get a retune and your done but i'd just fit some new ignitors and run the stock coils.
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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Fri Jun 10, 2011 12:14 pm 
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thats why i have stayed with the au engine for now, considering im pushing more power than the average flash tuned ba/bf turbo on a stock au n/a head and bottom end.
if your after an outright monster and are goin to spend the big $$$ on a the full built engine, then yes the dohc would be the one to go with..
if i was going with dohc engine i would do exactly that, run cable throttle body, wasted spark or ls1 coils and lock the cams with a vernea gear..
look at most big power dohc set ups and some large camed dohc n/a's, they run the vernea gears and ditch the vct..
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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Fri Jun 10, 2011 2:33 pm 
Getting Side Ways
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Papa Smurf wrote:
bry40l wrote:
hi papa smurf just wondering if the fg xr6 turbo rods/ all fg i6 rods are same as the f6 rods? ie, same part number?
thanks

ALL FG Turbo conrods are the same, the standard and LPG ones are AU2/3/BA/BF.

i was almost right,

 

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xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Sat Jun 11, 2011 6:59 pm 
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Dansedgli wrote:
Less pioneering with an au motor???

How many au motors are making more than 500kw? 2 or 3?

Dozens of twin cam motors are doing it and on stock cams.


First, I'm referring to Twin Turboing, there would be a lot more info out there for AU engines than for the BAs.
Where did that 500kW come from by the way, OP never mentioned specific power that he wanted to achieve, although Im gonna assume that by looking at twin turbos hes not looking to do a car for his Nanna.
As you say, BAs push 500kW easy and I havent seen many with a twin setup (I am NOT saying it hasn't been done!!!)

If he forks all the money into the AU motor that is already installed and wired up engine, spends right in making it strong enough, a twin turbo AU engine should push over 350kW... Shouldn't it?? (aimed at all techies who have played with turbos themselves and have first hand experience please.. no mate of a mate crap)

As far as I understand it, 2 turbos = s**t loads more power?

 

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[color=#004080]Cheers, Jacob.

NA Fairlane Build thread:
the-garage-f53/my-fairlane-build-lowlane-t94891.html.
Also in the garage....
AU LTD, DC LTD, and Lowlane.

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Sun Jun 12, 2011 10:19 am 
Getting Side Ways
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Actually something different would be triple turbo's..
VF turbo's like WRX use with small A.R housings..
Not STI turbo's too large A.R turbine...
VF 24 or VF29 used in auto WRX's / group N...
There isn't much difference power wise on the amount of turbo's..
Generally ONE big turbo will have more power in upper RPM..
What multiple turbo's will give you is slightly better lower rpm
response if turbo's are well suited to engine..
Both engines are GOOD !!
The higher compression of AU engine must be addressed..
At Least well tuned to keep durable..
There power is made at lower RPM than the twin cam..
But really 300 RWKW and more than that torque wise
IS bloody fast for a street engine..
The "auto" trans doesn't need to be modified other than cooler...

You have to keep in mind some SOHC turbo projects in the past have been fairly
poverty pack..
While the BA engine is possibly demanding better ECU / tune etc...
Tunable ECU with XR6T's std...

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Sun Jun 12, 2011 12:59 pm 
Getting Side Ways
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Now THAT'S pioneering!!!

 

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[color=#004080]Cheers, Jacob.

NA Fairlane Build thread:
the-garage-f53/my-fairlane-build-lowlane-t94891.html.
Also in the garage....
AU LTD, DC LTD, and Lowlane.

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 Post subject: Re: Twincam or not to twincam, I have some questions.
Posted: Sun Jun 12, 2011 10:38 pm 
Getting Side Ways
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Lowlane7 wrote:
Now THAT'S pioneering!!!

Yea only on the manifold.. Two into 1 is EASY !!!
Mounted about 45* to motor for dump pipe clearance
They are internal gated so no extra fabricating ...

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Top
 Profile  
 
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