97 SFA - Lexus V8 1UZ Conversion.... VVT-i vs non-VVt-i
Posted: Tue Mar 20, 2012 1:15 am
Hi All,
As stated in a previous related post on this forum... (See "97 SFA - Lexus V8 1UZ Conversion.... AUTO vs MANUAL")... i've taken the (mental) plunge and i'm doing it... that is - Converting my 97 SFA 2.8D DC Lux to a Lexus V8.
Yes - many, many questions and lots and lots of research - BUT - now i am happy with the decision, and surely the gods will smile upon my particular conversion job and i will emerge a happy man and proud owner of a fantastic new and revitalised '97 V8 Lux.
So - lets admit first of all - I am still not 100% sure on which variant of 1UZ-EF engine - but lets say i am 99.9% there ...and for the benefit of anyone considering going the same route, and for those who wish to add their experience, and tell me im making a huge mistake(!) - you are all most welcome - please post below ... :)
As far as the differences (as i understand them) between the Non-VVt-i and the VVt-i, ive added my 2c worth of PRO's vs CON's:
please feel free to rip it all to shreds... :)
Looking forward to hearing your comments...
Cheers
Jim
p.s. Final decision re VVT-i or non-VVT will be made by wednesday.
Pro's & Con's: Non VVT vs VVT
1UZ-FE Non-VVT-i
PRO's:
1. Cheaper as an initial purchase
2. Simpler - only 1 condenser per row (amongst other things)
3. condensers cheaper (R400 vs R1000 for VVT-i version)
4. if u go Spitronics - only needs 1 ECU module
5. lots of spares around
6. less programming on the ECU to worry about? (could also be a CON?)
CON's:
1. Less fuel efficient (slightly) - (see VVT-i Pro's below)
2. Less power & torque (see VVT-i Pro's below)
3. Older engine (1989-1996)
1UZ-FE VVT-i
PRO's
1. More fuel efficient - but only to the tune of about 10%, will need about 8 years to make up the difference in cost(!) (i am open to correction on this one... :) )
2. More power and torque (yeah - like you really NEED that extra 10% ha ha!)
3. Lots of spares around - and engine core is backward compatible with non-VVTi engines (not the head or the intake manifold though.)
4. Newer engine (1997 - 2002(?))
CON's
1. More expensive as an initial purchase
2. electronics more complex(?)
3. Condensers more expensive (see non-VVT-i PRO's above)
4. Has MORE condensers - (8 vs 2 on the non-VVT-1). BUT - that can also be seen as an advantage - if a condenser fails when you are FAR-AWAY and you forgot your box-of-spiders back home (FAR-AWAY), then u can still get home on 7 or 6 cylinders. (Not the same case for the non-VVT-1 which has 1 condenser per bank of cylinders.)
5. Needs 2 x Spitronics ECU (if this is your choice) - which also means you need 2 x Spitronics ECU carry-on spares in your box-of-spiders if you are going FAR-AWAY.)
Happy to hear you agree or rubbish my brief and admittedly possibly naive, analyses above. I can only learn!
cheers!
Jim
As stated in a previous related post on this forum... (See "97 SFA - Lexus V8 1UZ Conversion.... AUTO vs MANUAL")... i've taken the (mental) plunge and i'm doing it... that is - Converting my 97 SFA 2.8D DC Lux to a Lexus V8.
Yes - many, many questions and lots and lots of research - BUT - now i am happy with the decision, and surely the gods will smile upon my particular conversion job and i will emerge a happy man and proud owner of a fantastic new and revitalised '97 V8 Lux.
So - lets admit first of all - I am still not 100% sure on which variant of 1UZ-EF engine - but lets say i am 99.9% there ...and for the benefit of anyone considering going the same route, and for those who wish to add their experience, and tell me im making a huge mistake(!) - you are all most welcome - please post below ... :)
As far as the differences (as i understand them) between the Non-VVt-i and the VVt-i, ive added my 2c worth of PRO's vs CON's:
please feel free to rip it all to shreds... :)
Looking forward to hearing your comments...
Cheers
Jim
p.s. Final decision re VVT-i or non-VVT will be made by wednesday.
Pro's & Con's: Non VVT vs VVT
1UZ-FE Non-VVT-i
PRO's:
1. Cheaper as an initial purchase
2. Simpler - only 1 condenser per row (amongst other things)
3. condensers cheaper (R400 vs R1000 for VVT-i version)
4. if u go Spitronics - only needs 1 ECU module
5. lots of spares around
6. less programming on the ECU to worry about? (could also be a CON?)
CON's:
1. Less fuel efficient (slightly) - (see VVT-i Pro's below)
2. Less power & torque (see VVT-i Pro's below)
3. Older engine (1989-1996)
1UZ-FE VVT-i
PRO's
1. More fuel efficient - but only to the tune of about 10%, will need about 8 years to make up the difference in cost(!) (i am open to correction on this one... :) )
2. More power and torque (yeah - like you really NEED that extra 10% ha ha!)
3. Lots of spares around - and engine core is backward compatible with non-VVTi engines (not the head or the intake manifold though.)
4. Newer engine (1997 - 2002(?))
CON's
1. More expensive as an initial purchase
2. electronics more complex(?)
3. Condensers more expensive (see non-VVT-i PRO's above)
4. Has MORE condensers - (8 vs 2 on the non-VVT-1). BUT - that can also be seen as an advantage - if a condenser fails when you are FAR-AWAY and you forgot your box-of-spiders back home (FAR-AWAY), then u can still get home on 7 or 6 cylinders. (Not the same case for the non-VVT-1 which has 1 condenser per bank of cylinders.)
5. Needs 2 x Spitronics ECU (if this is your choice) - which also means you need 2 x Spitronics ECU carry-on spares in your box-of-spiders if you are going FAR-AWAY.)
Happy to hear you agree or rubbish my brief and admittedly possibly naive, analyses above. I can only learn!
cheers!
Jim