Port & Polish vs Turbocharging?

[Lorrliew]

I've a 2.2L NA car with auto transmission, have been contemplating on customised turbocharging and been checking around. Base on my guesstimation and discussion with some workshops, running a low boost of 0.5 (for engine & transmission longetivity), I should be able to achieve approx. 55bhp & 60Nm torque additional.

 

The other option is to do a Port & Polish with a customised exhaust manifold at 35% of turbocharging cost, the workshop told me that I should get approx. 10bhp and 40Nm additional. It seemed to me the improvement is overstated?

 

Currently, I already running on piggyback ecu and 'improved' exhaust system.

 

Any opinion which is a better option and advise from experience MCF Bros?

[Furrynadz]

sell and buy a wrx

[Zrun]

Depends on your requirements.

 

Port polish, intake, manifold, exhaust, suspension, maximizes your car's potential as a race car as a NA car should be. You'll probably retain reliability of your car under many circumstances.

 

While a custom turbo kit boost much more hp/torque, significantly increases your future time spent under your car's hood whether you like it or not. You'll likely destroy the engine, or find leaks all over if you drive your car on a track all day with just a turbo kit, but that's not what most people do.

[Spade]

P&P is a constant fuel waster even if you idle.

 

Turbo only wastes fuel when you engage it.

 

Think about it. how many times at the pump before you add up to a turbo system?

[Kalaplus]

before turbo kick in, it already spinning liao, will also waste fuel.

y is port & polish is fuel wasting?

[Stivo]

port and polish only makes your car breathe better... u will not see significant hp gains but will feel incresed torque over all rpm range...

 

P&P and tc.. are 2 different ball gain... if u wanna go only 0.5 boost then no point tc the car... cos the cost of tc is not justifiable for such small gain which is achievable with a sc..

 

just my tots...

[Stivo]

u driving celica??

[Koren]

Boost only kicks in @ a certain RPM.. below that.. its running on vacuum.. so its basically running the same fuel map as a stock car.. hence, retaining its stock FC.

[Koren]

$3000 for 60Bhp @ 0.5bar boost

 

or

 

$1200 for 10Bhp for pnp

 

well.. after you've start boosting.. u'll be finding ways to boost higher n higher..

[Yuhsuan]

Obviously you have no idea how a turbocharger system work..........

 

P&P is a constant fuel waster even if you idle.

 

Turbo only wastes fuel when you engage it.

 

Think about it. how many times at the pump before you add up to a turbo system?

[Lorrliew]

Exactly is my thought, I've done ecu, exhaust and suspension; with port & polish (PnP) and manifold, I basically complete what I can probably do for NA cars. Do you think the figures of improvement quoted for PnP overated?

 

As for TC, it is exactly my concern of spending too much time in the workshop. Many claimed that a low boost have a lot less problem, that's the thing I'm still having some doubts?

[Silver_z]

Comparing Port N Polish to Turbocharging? If in terms of price, can fight..... In terms of performance...... Tuscani Vs Ferrari.

 

Btw, if your port and polish is 35% the price of turbo.... There is only 2 things.... Turbo over priced, Port n polish is a sloppy job.

[Lorrliew]

The cost of increase fuel consumption is a misconception in my opinion. Let's do an arbitrary calculation on Cost of car ownership annually:

 

Actual depreciation for 5yrs (including interest from loan) = 10k

(Although the car depreciation on paper for 10yrs is 7k)

Road Tax & Insurance = 3k

Maintenance (including tyres) = 2k

Fuel = 4.5k

Total annual cost = 19.5k

 

If your fuel consumption increased by 15%(ie. 0.68k), the overall increase in your annual ownership cost is only only 3% (ie.0.68k/19.5k). It is really relatively insignificant, the killer is our actual depreciation.

 

Food for thought............... Cheers!

Edited September 14, 2006 by Lorrliew

[Dwoon]

From what I understand from your posts... you're basically looking for power..... TC is the way to go then. But dun get caught hor (think its $750 now) ..... inspection time would also be a headache.

[Lorrliew]

You're sharp bro! and right in certain sense!

 

It is actually the case of PnP overpriced, cause the guys is seemed to be highly regarded by his regulars for very good PnP (as you may know quality/outcome of PnP is fully dependant on the skill) and he's reluctant to do PnP because it's a time consuming and manual jobs.

[Konspire]

really bro, doing either both will hv ur FC up n then might run up foul with the law....best is get the STI WRX 2.5 n u r really legal wif turbo n new car...

[Lorrliew]

Test drove Lagacy 2.0GT a few days back, the power is a little too raw for day to day driving and turbo lag is suprising bad. By the way, the Legacy 2.5T is launching soon and will replace the 2.0T.

 

After much consideration, probably is better to 'zhng my car' and 'extend' its life, overall cost should still be a lot cheaper than a new car.

[Konspire]

hv u tried the WRX STI 2.5?