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Location:
St James, Perth
Registered:
June 2004
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 Silvertop or Blacktop 20v for 1991 Corolla GTi
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Fri, 02 July 2004 07:13
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Hi all,
Just wondering if anyone knows the ins and outs of the differences between the Silvertop and Blacktop 20valve engines?
Which would be better in the '91 'Rolla GTi? Remember, the GTi is FWD, if it makes a difference. I don't have a huge amount of money to spend, so cost is a very important factor.
Thanks! 
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Location:
Brisbane
Registered:
May 2002
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Fri, 02 July 2004 09:47
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...you're probably better off spending the money on working your 16V a bit...
both 20V's aren't really worth the effort over a nice 16V. The only real benefit of the 20V's is the smooth revving nature.
There isn't a real world noticable difference between the blacktop and the silvertop, just try to get a post '93 silvertop with a C56 5-speed if you are set on wasting money on a 20V swap  You can usually read the date of the motor from the date stamped on the plug leads.
I've done both swaps, and from what myself and one of the other guys here in Brisbane (who has done 4 other blacktop swaps) have seen, the blacktops aren't as reliable as the silvertops... I've had to put a new hydraulic timing belt tensioner and VVT intake cam pulley on mine (90,000K's on the motor, otherwise very good condition) which have cost an additional $600 on top of the cut's original $2300 price.
The only real standard "conversion" I'd recommend for the AE9x FWD's is a nice MAP GZE. Gob's of torque from very low rev's, with great power right through to redline. Tons of fun for a street driven car.
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Location:
brisbane australia
Registered:
July 2004
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Sun, 04 July 2004 02:15
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i race 4wd and the blacktop does seem to cause more trouble one of my mate has had three black tops to one of the silvertops. some silvertops only come with vvt and some come with vvti, the vvti switches on and of at several diffrent positions where the vvt only switches on and off at one set pricible namly 4,400rpm. with an afetr market computor like the link which runs a tps map and the vvt you can preset your rpm setting for when it switches on and off. havong said that another guy in the group has a 86kw 16v whick has had head work and its as quick if not quicker than all the 20v, at this stage i know of a guy that has 122k at wheels in his 20v sierra, but is now going turbo cant wait to see it.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Sun, 04 July 2004 02:38
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Phew, after reading that last post all I can say is: Spelling, punctuation, proof read???
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Location:
brisbane australia
Registered:
July 2004
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Sun, 04 July 2004 02:45
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i am sorry for my lack of education, but i thought this was about advise on cars not picking on people for their lack of education.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Sun, 04 July 2004 02:54
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dude, harmless poke! don't take it personally - I know I personally type much worse (and less correct) things late at night.!
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Location:
brisbane australia
Registered:
July 2004
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Sun, 04 July 2004 03:11
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no probs, im in the midst of running a 20v into another sierra. i was wondering if anyone new what the voltage for the vvti is, its either 12volts or 5 volts, i need to know to wire in the link
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Location:
Parramatta
Registered:
July 2002
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Mon, 05 July 2004 02:23
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dont have much to say on the topic but i know 20v's respond really well to a turbo conversion.... but u said money factor... so prolly not the best idea.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Mon, 05 July 2004 02:24
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| 20vsuzi wrote on Sun, 04 July 2004 10:45 |
i am sorry for my lack of education, but i thought this was about advise on cars not picking on people for their lack of education.
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Yep as mentioned above, my previous comment was made in jest, although I will admit to having to read your post several times to understand it?! If I offended you, I apologize.
Tell me more about the differences between the VVT and the VVTi, and how to distinguish between the two?
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Location:
Sydney, OZ
Registered:
May 2002
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Tue, 06 July 2004 06:46
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some silvertops only come with vvt and some come with vvti, the vvti switches on and of at several diffrent positions where the vvt only switches on and off at one set pricible namly 4,400rpm
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 who told you this? All 20V are VVT. It's simple system that advances the intake cam at a set RPM, usually the high end, via a solenoid and oil pressure. The flashing you see is just the ECU coming on and off in order to give the engine more torque when needed then re-adjusting the cam for more power, Ford use the same system Know as VCT.... VVT-i is only seen late model engine ie in the 1ZZ and 3SGE(dual), and VVTL-i 2ZZ. VVT only advances the cam, VVT-i advances AND retards, VVTL-i Advances,retard and varies lift.
Digital, you have Four choices a)rebuild yours, b)Buy a S/T, c)B/T or d)a GZE. A good rebuilt 4AGE 16V using good cams, internal will produce results far better than a stock 20V, A rebuilt 20V can give better results than a 16V but at greater costs, and GZE will either monster or give all these mod engines a good run, depending GZE model, remembering that you'll need to rev the tits off all the other 4AGE just to keep up from a standing start... rip the S/c off and slap a turbo on, all variants will be looking at your tail lights.... find a few guys here and go for a run then make your decision
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Location:
St James, Perth
Registered:
June 2004
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Re: Silvertop or Blacktop 20v for 1991 Corolla GTi
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Sat, 10 July 2004 04:00
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Thanks all. Looks to me like I should just go the hack and transplant a GZE in, in order to save a bit of money in the long run. Thanks guys!
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