Hello all... :)
Just wondering if I could join you guys. I was an avid car enthusiast, at least until the time I got married about 4 years ago, and have taken a break for quite some time. However, I'm thinking of "indulging" a little again. I have quite some experience in modding. My last ride was a Toyota Celica GT4 Turbo RC sporting 450 bhp.
I have a 9 year old 3.0l A32...bought and rebuilt 3 years ago and kept generally stock. I'm currently thinking of doing some radical surgery but am not quite sure if it will be worth it. Perhaps I could have some of your opinions.
I have been thinking of downgrading to a 2.5l. I have been toying with this idea because of the road tax issue. Basically, the 2.5l motor puts out 186 bhp compared to our 211 bhp. Used in conjunction with a 2.5l gearbox (the gearboxes are identical except for the final drive ratios), there would be no difference at low speeds (torque curves being matched), but there would be some loss of top end. I am thinking of using my original 3.0l gearbox, losing some of that low end torque but maintaining my top end.
I am thinking of a hybrid. Using the intake manifolds, outlet manifolds and gearbox from my 3.0l motor on a 2.5l block. The increased airflow should negate most of the losses in torque at low rpm's whilst maintaining top end performance.
In this situation, I would also be using my 3.0l injectors, MAF and ECU. Will probably need an S-AFC at a minimum to fine tune the MAF but that's not difficult. I suspect these are identical or almost identical anyway.
Coupled with a cold air intake, I'm quite confident of being able to re-tune the motor to above 200 bhp again. The cold air intake alone (the funnel that comes with our intake has been found to be very restrictive) should provide a 10 bhp boost at a minimum and the S-AFC is purported to be able to give you another 10% - 20%.
Ultimately, it all boils down to cost. I have been able to find a 2003 long block off a 2.5l Japan Cefiro for RM 2,400 (I still have friends in the "potong kereta" industry so have little problems finding parts). I estimate workmanship at around RM 1,000. A few parts will have to be changed like water pump, belting, timing chain tensioner (maybe) and lots of rubber parts replaced with silicone. Probably another RM 1,000.
The whole job would cost me around RM 4,500 or so. Calculating the recovery period from road tax savings of RM 1,225 p.a., this would be equivalent to 3.67 years.
Optionally, I could spend RM 1,000 to rebuild the motor as the current motor is not too bad...basically just needs to be reshimmed and I'd probably need to take off the fuel rail as I suspect some minor leakeages. Probably invest in some silicone and construct a cold air intake.
So...what do you think?
Btw. I notice some of you having some problems with your gearboxes. I have a source in Singapore for 2.0l gearboxes. Last time I asked, they were under RM 1,500 per piece. Not sure if the 3.0 gearboxes are available. The difference is in the final drive ratio. i can't remember off-hand but I think the 2.0/2.5/3.0 ratios are 3.67/3.92/4.08. Basically, if you use a 2.0l gearbox on a 3.0l, the gearing would be too aggressive. You'd basically be doing higher rpm's at lower speeds. On the bright side, your torque in traffic would be phenominal. You will definitely burn more fuel. There is not so much diff between the 2.5l and 3.0l. A 2.5l gearbox on a 3.0 l would make it much more responsive. A 3.0l gearbox on a 2.5l would lose you some torque (a tad more draggy at low rpm's) but would improve your top end.