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Turbo or N/A 

 

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 Post subject: Turbo or N/A
Posted: Thu Aug 11, 2005 2:12 pm 
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Hey all,

Engine is out and stripped, So now is the time to decide on what to do.
Im going to keep it a six and an auto.

So my options are tough n/a engine, 11.1 comp, twin throttle bodies, massive head work and a huge cam.....will make around 420hp and id chuck a 100 shot of noz.

Or rebuild the bottom the bottom end with low comp and buy the stage 5 snort performance kit. And run some serious boost.

What would you guys reccomend and why? Have to start doing things soon.

The n/a setup would be different and freak alot of people out but the turbo would be alot more driveable and make more peak hp...So I dont know.

 

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Posted: Thu Aug 11, 2005 2:19 pm 
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turbo is just something else to go wrong in my opinion... but i like the feel of a blower - smooth - (yes i have had both in similar ricers :oops: ) and to be na and blow away the opposition who then say you have a turbo or somethin and you say nope! it feels good :twisted:

but if i had a choice of all three i would probably go a clutch controlled blower - but then again i prefer a cruiser to a racer :P

 

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Posted: Thu Aug 11, 2005 4:02 pm 
Getting Side Ways
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Blower setup would be very drivable, but for some reason N/A setups are just so cool, especialy with a NOS kit.

Have you checked insurance and prices on kits avaliable? That information might make the decision for you.

 

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 Post subject: Re: Turbo or N/A
Posted: Thu Aug 11, 2005 4:04 pm 
Getting Side Ways
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SQUEAK wrote:
So my options are tough n/a engine, 11.1 comp, twin throttle bodies, massive head work and a huge cam.....will make around 420hp

Who told you that ? That's like 315kw - which is more than you could expect out of a NA 4l

It all comes down to money. If you've got 10 grand to spend on a turbo set up then do it. There's a big difference between top end NA mods and a "stage 5" turbo kit though...

My NA engine is quite "drivable" with plenty of torque

 

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Posted: Thu Aug 11, 2005 4:58 pm 
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I added my 2c on the same topic over in the ECU forum.

200RWKW is the limit from a 4L. If you can get more, you'll do all the 4L performance guys out of business!

 

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Posted: Thu Aug 11, 2005 5:01 pm 
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also N/A is less messy when it comes to compliance

 

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Posted: Thu Aug 11, 2005 8:30 pm 
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TURBO, if you want 300wkws plus then your lookin at turbo or supercharging it, forget NA.
Anyone who's owned/driven a turbo i6 will say this.

Fact is alot of poeple are scared of turbos, sure they were a tad dicey in the 80s, but they are safe as these days
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Posted: Thu Aug 11, 2005 8:31 pm 
Getting Side Ways
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Oh, and just have an intercooler on the front spells " you have no chance mr hsv" :D
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Posted: Thu Aug 11, 2005 9:31 pm 
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Agreed - going back 3 or 4 years ago, I was ranting and raving to all my mates about this 'Jim Mock' crowd who did wonders with 4L taxis (hehe)...I was so keen for a dev kit at the time.

At the time, I had a GRA under bonnet TB with converter, with some work going on to my car - I got to test drive the Gas Research's AU test mule for a weekend - T3 turbo, non intercooled (but with water injection), 5psi boost (158 rwkw), chip torque chip and still with 713 + kms out of a tank of premium with a full load of luggage and 2 other passengers also in 30+ degree heat...it was then that I knew what I wanted.

I guess it comes down to what you want out of your car - N/A is great...cops can inspect the engine bay and see there's no visible evidence that your car is illegally modified...obviously different for turbo / supercharger setups.

N/A your performance gains are always higher up in the rev range - turbo makes great torque down low...mine's un-tuned at the moment (pings under 1/2 - 3/4 throttle) @ 35000 RPM - but is still very drivable for daily commuting even with a bit of kick too.

In summary - N/A setups are relatively cheap *read Wade Stage 2 cam, zorst, stractors, 3.45 final ratio, T5 etc)...but for bigger power - turbo / supercharger - it's that simple IMHO.

 

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Posted: Thu Aug 11, 2005 10:02 pm 
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Turbo or 8. Obviously you've decided not to get an 8, so turbo on the I6 is the go. Proven power, especially on the I6.

 

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Posted: Thu Aug 11, 2005 10:04 pm 
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I went the turbo path and I love it. Speak to Joe at Cresent motorsport as I think he has an engineer (works saturdays) who can supply a certificate for their turbo kits.

 

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Posted: Fri Aug 12, 2005 12:59 am 
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Cops and rta dont bother me at all.

Ive decided to go the n/a way with a shot of gas.
Been speaking to certain people and I have got a guy that will do my head and it will flow 500hp at 600thou lift.

I can get my custom cam ground for a reasonable price, Im still fine tuning the cam specs but its f**k huge... :twisted:

And im very confident I can break that 200rwkw without the gas and through an auto...... :twisted:

Ive got most of the combo sorted, I just need to find some extractors big enough....No one makes pipes big enough for what I need. I also need a 3inch exhaust, So I need extractors with a 3inch collector. Does anyone know of a company that sells them? So far I think im going to have to go custom.

Last of all Im just trying to work out what computer to buy.

 

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Posted: Fri Aug 12, 2005 1:15 am 
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SQUEAK wrote:
Cops and rta dont bother me at all.

Ive decided to go the n/a way with a shot of gas.
Been speaking to certain people and I have got a guy that will do my head and it will flow 500hp at 600thou lift.

I can get my custom cam ground for a reasonable price, Im still fine tuning the cam specs but its f**k huge... :twisted:

And im very confident I can break that 200rwkw without the gas and through an auto...... :twisted:

Ive got most of the combo sorted, I just need to find some extractors big enough....No one makes pipes big enough for what I need. I also need a 3inch exhaust, So I need extractors with a 3inch collector. Does anyone know of a company that sells them? So far I think im going to have to go custom.

Last of all Im just trying to work out what computer to buy.


I've spent around $10-15k chasing 200RWKW N/A. Myself along with all the 4L performance shops will be amazed if you can crack the 200RWKW. If you somehow peak 200RWKW at 8000RPM, it would be no more than a Dyno Queen. The power curve would be pathetic, and power/drivability around the streets would be boring.

If it was as simple as hogging out the ports and throwing in a cam with 0.300" lift, everyone would be doing it already.

420HP is a big power chase even for the EFI 302 guys who have a MASSIVE aftermarket selection of bolt on gear.

XR8Chic has the best heads money can buy for a street 302 (280CFM @ .6500"/270CFM @ .500"), a high flowing intake manifold, good pipes. Then compared to the 4L it has an extra 1000cc of displacement, 2 extra cylinders and 4 extra valves and can only get 200KW to the treads.

 

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Posted: Fri Aug 12, 2005 1:21 am 
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That being said, My mates had au series 1 xr8s.

They had standard heads, spacers under the inlet manifold, larger throttle body, and a ported maf, extarctors and a stage 1 trickflow cam and a unichip, 188rwkw.

 

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Posted: Fri Aug 12, 2005 1:28 am 
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SQUEAK wrote:
Cops and rta dont bother me at all.

And im very confident I can break that 200rwkw without the gas and through an auto...... :twisted:


BUUUULLLL SHHHHIIIIIITTTT

Build it, and I will believe it. But until then :x

And :!: Why wouldn't the cops and RTA bother you :?: Are you GOD or something :?: STOP DREAMING, OR PROVE ME WRONG :!: :!: :!: :!:

I am sorry to be such a prick, but I know about the trial and error of trying to build a N/A I6 (and auto wont cut it). I just hope you're dreams are not shattered. And if for some reason you do achieve that power, be prepared for a rebuild every month :!: :!: :!:
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