Stroking Chocco's Cross 8 - Fuel Economy Question ??????

[IJ.]

Do they make front and rear gear sets to suit the Cross 8's?

Haven't found alternates for the Fronts, stock is 3.46:1.

[swingtan]

I thought the front ring and pinion were the same as the rear, it was a pretty big assumption though.......

[IJ.]

Pretty sure the Front is a ZF Part Simon,Holden used 2 rears depending on IRS or Live axle, been trying to track down a Quaife centre for mine, I "believe" it's used in some of the BMW X cars..

[QldKev]

Without knowing a budget amount I can only guess.

Stokers add up to $, and without external mods may not be the best idea. Every stroke of the engine on a stroker will consume more air in, and produce more exhaust. Without the external mods you are restricting the power from day 1.

Blowers cost a few $, but they are pretty easy to bolt on; and remove. So later if you decided to sell the car, you could unbolt it and recoup a good chunk of your money or use it on your new toy.

I would be looking at what Swingtan said. Do the intake, exhaust and tune first.

The other thing is what fuel are you currently running? Most tuners opt for 98 octane. I've found whilst I do get better L/100, the extra cost of the fuel balances it back out; but I do have at a guess 30-35% more hp than stock.

QldKev

[XUV]

I already know a cam is not going to give me what i want and either is a tune.
.

I think you're wrong and you should look harder, re read the cam debate threads, chev did some work for you, talk to him.

Question is how many torques are you after ? You should dyno your rig so that you have a base number .
Dyno tune it so that it's doing it's thing at what 2500-3000 rpm in 3RD .

[chocco]

I think you're wrong and you should look harder, re read the cam debate threads, chev did some work for you, talk to him.

Question is how many torques are you after ? You should dyno your rig so that you have a base number .
Dyno tune it so that it's doing it's thing at what 2500-3000 rpm in 3RD .

Yes I am planning on taking the car down to VCM for a power run to see where it is at before I do anything.

Torque Numbers I am after 600 -650nm but low in the rev range, its no good to me high up, the auto should be fine as I dont flog it.

Tuning might get me some but correct me if I am am wrong, its not going to move it to where I want it.

swingtan
Re: Stroking Chocco's Cross 8 - Fuel Economy Question ??????

If you're towing, want more "go and on a very tight budget, do the diff gears and get it tuned. Actually, I'd probably aim for the following...

1.Decent exhaust: might be a tad tricky if it's used "off road" but certainly worth the effort.
2.Decent intake: Two Hole Mod works fine, don't be overly swayed to pay out $500 for an OTR unless you want the look.
3.Tune: Big changes here to suit the above.
4.Diff Gears: Makes a significant change to how the car drives, especially towing. With an appropriate tune, you won't loose economy.
if the budget can stretch...
5.Cam and springs: move the torque range to where you want it. A mid 220's cam with gentle lobes will pick up power without risking longer term issues.

If you got all the work done in a shop, you could probably allow $3K for stage one and the same for stage 2. If you're handy with the spanners and get a bargain in the classifieds, Stage 1 could come down to $1500 and stage 2 to $1000.

Just something else to consider.

Simon

Thanks Simon,

1) The exhaust I have is a dual 2.5inch off a VZ Crewman Thunder, guy I got it off reckons it dyno'd 6rkw less than his name brand, still better than the crap that was on their. Currently have HM shortys these will be replaced with DiFilipo Long Tube Black Cermic coated, from what I have these headers will move the peak Torque lower in the rev range, comparing dyno sheets and reduce bonnet temps cause it gets real hot.
2) Two hole mod already done using HSV Lower Air Box.
3) Yes Tune after I do what I need to first, whatever that ends up being.
4) Diff gears no-no as it will push up the revs at cruising.
5) Cam would be the best option, but to a extent its a unknown exactly how lower the peak torque will move in the rev range and what I will get out of it. I have one chance to get this right.

Souljah
Re: Stroking Chocco's Cross 8 - Fuel Economy Question ??????

Trying to do it on the cheap is only going to cost you more in the long run. I can't imagine fuel economy, stroker, towing and tight budget all go in the same sentence.

Probably didnt explain my self properly, I dont really care that I get 21ltr towing, just dont want 30ltr towing. We have 2 V8's in the family wouldnt have it any other way.

If I do a stroker or CAM/springs it will be parts only, cost. Otherwise I would just do tune and leave it. The car only does 5000km a year max.


Thanks everyone for your input, if anyone has any CAM only dyno runs with a stock LS1 with headers/exhaust only with grind they used let me know, remembering that the auto is stock and will be left stock.

PS - I know FI is best, god only knows I know it, but it aint going to happen, ever.
Cheers

[Micks]

Not trying to be a downer but chasing that torque figure @ low noise will be pushing shit up hill to achieve it!
But if you do will eat my words!!

[swingtan]

6.0L

Untuned, just the DiFillipo 4>1 longs and 2.5" exhaust.



And then with a tune.....




The 6.0L may be a better option.

As for raising RPM, what's your thinking with that? You do realise that any increase in fuel usage from the higher RPM is more than offset by the increase of torque from the gear ratio. Most people I've seen have increased economy after fitting diff gears (and tuned to suit).

[chocco]

Not trying to be a downer but chasing that torque figure @ low noise will be pushing shit up hill to achieve it!
But if you do will eat my words!!

600 is my aim anything over that will be a bonus.

[macca_779]

Use a small duration cam like a 216/216 .600 .594 112LSA from camtech. You'll get big torque gains and loose no fuel economy

[Micks]

Agree with you, my L76 with baby cam could achieve 600nm & 278rwkw @ full noise. That's with the great flowing L92 cylinder heads that the 5.7 doesn't have!

[Micks]

600 is my aim anything over that will be a bonus.

Hope you get there mate, just remember whatever the result you'll have no slouch as any LS engine is far superior & most economical than it's predecessors or any Ford for that matter!!

[IJ.]

pokes Choc in da PM...

[chocco]

6.0L

Untuned, just the DiFillipo 4>1 longs and 2.5" exhaust.



And then with a tune.....




The 6.0L may be a better option.

As for raising RPM, what's your thinking with that? You do realise that any increase in fuel usage from the higher RPM is more than offset by the increase of torque from the gear ratio. Most people I've seen have increased economy after fitting diff gears (and tuned to suit).

Sorry Simon, I just assumed a drop in ratio means higher rpm = more fuel at cruise instead of cruising at 2000rpm i would be cruising at 2300.

I am not worthy !

As for the 6ltr, my eye is on ebay but i would have to change the reluctor adds to the cost

[chocco]

Reckon the missus would notice if I swapped motors with the SSV