[hugheszook]

Just chasing a few mechanical upgrade options for a Grand Vitara to improve performance?


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[henno]

hugheszook wrote:

improve performance?

More information required. Improve it's performance at what task?

[hugheszook]

henno wrote:

hugheszook wrote:

improve performance?

More information required. Improve it's performance at what task?

Power, fuel economy..


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[henno]

Ooooh, engine performance.

The H27a in the 2006 GV is already the most powerful Suzuki engine they ever produced in their offroad cars (the GM 3.2L transplant notwithstanding) so I am not sure what you are seeking to achieve. I have driven a H27a NGV and found both the power and fuel economy perfectly fine for a road car, all things considered.

How much extra power do you need?

[Gwagensteve]

Need being the key word.
I'm sure many people "want" 600hp in their car but that's not the same.

Offroad, the 3.2 seems actually overpowered, in that it's difficult to modulate.

[Marck]

I think the only thing I would like to improve is economy. But in saying that it's only really bad when it's heavy and has the racks and light bar on the roof.


Incase you haven't tried already fuel choice makes no difference in economy straight 91 seems to preform just as well as 98.
I do use an upper cylinder head lubricant in it when it's working hard in the sand seems to be a little smoother. But that could all be in my head.

I am not the best driver but the cruise control can drive my GV about 15 to 20 percent more eficiantly than me on the highway.

I would be curious to know if anyone has done any sort of remap / chip / piggyback ecu to improve economy / power.

M

[Gwagensteve]

I'm not really sure how much economy can be improved with tuning. Modern engines with oxygen sensing (particularly cars with multivalve, alloy cylinder heads) will already run very lean under cruise - It's the one thing manufacturers absolutely obsessive about, because manufacturers are penalised on their corporate average fuel economy in some markets (like the US)

Then there's the issue of BSFC (Brake Specific Fuel Consumption.) Regardless of the motor, pretty much every engine consumes (sorry for the SAI units) 0.5lb of fuel per HP per hour. If the car needs, say, 40hp to move it down the road at 100km/h, you're going to consume around 10l/100km at cruise.

Aerodynamics, rolling resistance, decoupling accessories, lowering RPM on boosted engines, reducing parasitic drag in the driveline (constant 4WD is an issue here) - there are lots of ways manufacturers can reduce the HP required to move the car down the road, but we, as end users, have very little ability to change any of these factors.

Adding power is much easier - increase spark advance and fuelling to hold the engine closer to Stoichiometric for more of the engines working range. This isn't going to help fuel consumption, but adding power AND reducing fuel use is way beyond aftermarket bolt ons for the same fuel. If you limit tuning to 98 octane it's possible, but that's obviously quite limiting.

[Gwagensteve]

Hugeszook,

I think you need to be more specific about your overall goals.

If I'm right, you've asked about "performance increases", a rear bar, and "comp" use, and you drive a NGV. You're in some unchartered waters here.

There's lots of skill and experience on here - if you outline more specific plans, we can provide more useful feedback, however, you're going to need to take the rough with the smooth - If you want a NGV on 33's that's strong enough to comp you can't improve economy - it's going to be heavy on fuel. You can't add traction and weight and have factory driveline reliability. You can't comp a car and maintain daily driving convenience. (at least for any time)