Engine conversion procedure

[patersonia]

i though that the road tax for 3.oL now is around RM16xx. my friend just renew his toyota estima 3.0 only around rm16xx

but still the road tax is still high compared to 2.5 which is around RM8xx

heard some member told me tat only MPV can get 1600++, bt normal 3.0L is 2100++ :( hope i will only pay fr rm1600++ fr this time renewal roadtax. :angel_smile: :angel_smile:

 

[weikee]

Do any of you know putting the NVG will reduce the roadtax by 1/2. The taxi driver my company always use told me that putting the nvg will reduce road tax to 1/2.

But putting to fatty will cause about 5k.

 

[edgar_raphael]

I knew someone's going to doubt it:

http://img161.imageshack.us/img161/4626/safciieo1gp6.jpg



The red is before, the blue is after, typo.

Sorry, here's the recap, lost the pictures earlier, and yes, with SAFC gained something like 20kW, that is more than 20bhp!

 

[weikee]

edgar_raphael,

Look like you made the air flow mixture to be more efficient. The original run (Red) seem to be running rich. We can't tell if ours engine here having the same problem until we put in a O2 meter. If we are running that rich it will sure improve respond and hp.

 

[edgar_raphael]

That is not my dyno sheet, it is from another Maxima owner in Perth.

That's why I am considering run the SAFC on the Maxima to extract more power.

He claimed the power and torque increases as soon as 2400rpm and above to less than 4000rpm.

And remember, our VQ30DE is actually running 20bhp less than the Cefiros because we don't have MEVI!

 

[weikee]

you got to find out if your engine are running rich or lean. if its lean than putting SAFC will help.

 

[ongteckweng]

Sorry, here's the recap, lost the pictures earlier, and yes, with SAFC gained something like 20kW, that is more than 20bhp!

bro ed...u got it all wrong my fren. from d graph, its around 10hp gain, which is around 7.457kw...

then its doable....but 20kw = 26hp....unlikely with just a SAFC...check the graph again. before SAFC, its slighly above 143hp...after tuning its 153.5 max...

here is d conversion table: http://www.statman.info/conversions/power.html

 

[edgar_raphael]

lol, perhaps I didn't explained precisely.

he did gained 20kw on the second tune up. This was the first dyno graph for 'optimal' tuning. The safc was set for only 1 setup, throttle at 50% and that was it.

After that, he had done a 2-setup on the SAFC with low throttlw setup and high throttle setup and he gained:

- Around 20kw at the wheels in the 2000-2750rpm.
- Around 15kw at the wheels from the 2750-6500rpm.

Paul from OHLSEN Development has proven some 20-30kW increase of power at the wheels when running rich on the VQ30DE, if however, you run on optimal settings, you won't gain much increase.

 

[ongteckweng]

lol, perhaps I didn't explained precisely.

he did gained 20kw on the second tune up. This was the first dyno graph for 'optimal' tuning. The safc was set for only 1 setup, throttle at 50% and that was it.

After that, he had done a 2-setup on the SAFC with low throttlw setup and high throttle setup and he gained:

- Around 20kw at the wheels in the 2000-2750rpm.
- Around 15kw at the wheels from the 2750-6500rpm.

Paul from OHLSEN Development has proven some 20-30kW increase of power at the wheels when running rich on the VQ30DE, if however, you run on optimal settings, you won't gain much increase.

i dont think we wanna run rich than the current stock...coz a lot of ppl already complaint about bad FC...

 

[edgar_raphael]

more power = more petrol.

You can even trick your AFM readings by adding resistor to the wires to run richer and you get more power.

 

[ongteckweng]

more power = more petrol.

You can even trick your AFM readings by adding resistor to the wires to run richer and you get more power.

exactly......its a simple equation...

 

[tongyc]

Retain 3.0l injectors, fuel rail, ecu, gearbox ecu, and measure the exhaust manifold to see if it is the same. I suspect that the manifold is narrower/smaller, and so is the rest of the exhaust system...

AFM...is common. I am currently using a 2l AFM in my car with no problems...

DO NOT make the common mistake of putting in a 2.5 litre engine, with 2.5 litre injectors but connected to a 3.0 litre ECU. You will run lean...and basically have no power or top end. When the AFM measures the amount of air going in, the ECU will interpret this volume into the equivalent in fuel and times an injection pulse. But it expects to find the bigger 3.0 litre injectors and delivers a pulse. If 2.5 litre injectors are present, for the same pulse width, less fuel is injected...hence, lean. If the difference is too large, the ECU gets confused because your O2 sensors will send back an unacceptable value, and the ECU may interpret it as O2 sensor failure instead of mismatched injectors but will not be able to detect anything electrically wrong with the O2 sensors. If the ECU is unable to resolve this conflict, it probably will go into "limp" mode...a safety mode to preserve the engine until it can be looked at by a mech.

Also, never match a 2.5 litre gearbox with a 3.0 litre gearbox ecu. I don't know for sure, cos I've never had the money to experiment...but I suspect the gearshifts will happen at the wrong times...

Y-pipe becomes mandatory to retain acceptable performance...

Sorry for digging this old post, but I am interested in getting a Cefiro. Based on the above advice, those this means that we only need to change the engine and retain everything else including the gearbox if I were to convert from a 3L to 2.5L?

 

[weikee]

if you retain the 3L g.box you will feel less power cause the matching gear are for 3L, its best to use engine kosong + g.box 2.5L

 

[polaris]

if you retain the 3L g.box you will feel less power cause the matching gear are for 3L, its best to use engine kosong + g.box 2.5L

Ya, agree with you. Previously i was using 2.5VQ engine but with 3.0VQ ECU & gearbox, result proved that less power & gearbox already 'kong', just changed to 3.0VQ & gearbox.

 

[tongyc]

if you retain the 3L g.box you will feel less power cause the matching gear are for 3L, its best to use engine kosong + g.box 2.5L

This means need to change engine and gearbox only. Other items like engine ECU, gearbox ECU, injectors, etc. can use back the 3.0L one. Is this correct? Thanks.

Bump:

Ya, agree with you. Previously i was using 2.5VQ engine but with 3.0VQ ECU & gearbox, result proved that less power & gearbox already 'kong', just changed to 3.0VQ & gearbox.

Can use 2.5L gearbox with 3.0L gearbox ECU or not. defcon1 warned;

"... never match a 2.5 litre gearbox with a 3.0 litre gearbox ecu. I don't know for sure, cos I've never had the money to experiment...but I suspect the gearshifts will happen at the wrong times.."

What's your opinion?

 

[sb3]

This means need to change engine and gearbox only. Other items like engine ECU, gearbox ECU, injectors, etc. can use back the 3.0L one. Is this correct? Thanks.

Bump:

Can use 2.5L gearbox with 3.0L gearbox ECU or not. defcon1 warned;

"... never match a 2.5 litre gearbox with a 3.0 litre gearbox ecu. I don't know for sure, cos I've never had the money to experiment...but I suspect the gearshifts will happen at the wrong times.."

What's your opinion?

My personal suggestion is spent a little bit more and buy a half cut and transplant everything from the half cut to your car. Less headache and more powermah..
If Iam not wrg price difference between half-cut & engine kosong about only rm1500-00. This money will be well spent trust me. Moreover , whether engine kosong or halfcut u ll still nee d for puspakom inspection.

 

[tongyc]

My personal suggestion is spent a little bit more and buy a half cut and transplant everything from the half cut to your car. Less headache and more powermah..
If Iam not wrg price difference between half-cut & engine kosong about only rm1500-00. This money will be well spent trust me. Moreover , whether engine kosong or halfcut u ll still nee d for puspakom inspection.

Since TC does not sell the 2.5L, is it difficult to get spares like injectors, O2 sensor, etc. for the 2.5L?

 

[weikee]

how often your car injector need to be replace?

The only problem its getting the top overhaul gasket.. but if your car need top overhaul, must well get another engine kosong, or maybe get it from Singapore/

 

[tongyc]

Any workshop(s) to recommend for servicing and doing engine conversion around Klang Valley area?