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Toymods » Tech & Conversions » AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head Show: Today's Posts  :: Show Polls  Email to friend

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ae86drift Forums Junkie I supported Toymods Location: sydney.au Registered: August 2002	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head Wed, 15 September 2004 03:21 THE WITZL wrote on Wed, 15 September 2004 09:31 dude - despite what you have said, have you thought about this: * larger ports going into smallport ports creates AIR TURBULENCE and DISTURBANCES, meaning that you would in fact be creating LESS power. I would put $50 on proving that too. * getting my 100kW manifold cut'n'shut cost a massive $180. wow * internal volume of the RWD manifold is not really bigger, and even if it was, what benefit would that give? Basically you are going to cause flow compression as the air volume is forced from a larger area into a smaller area, thus costing you free flow and subsequently power. The best way to OPTIMISE power is to minimise/remove all disturbances to air flow, hence the use of port matching manifolds and head porting! okay you kinda answered it here, TOO MUCH flow, created turbulence, thats what i was looking for. oK! i ralise its cheap as chips karl-o, but its time i dont have to do it, the car is my daily and im flat chat with working atm so i or my mechanic dont have time (i also didnt wanna chop up my manifold, as ill be using it later on with my bigport again when thi engine goes to toda spec-c tuned engine and quad throttle bodies) internal volume isnt bigger? yet you say it flow more air? into bigger ports? Bill Sherwood wrote on Wed, 15 September 2004 10:51 ae86drift wrote on Wed, 15 September 2004 00:55 and the bigger ports = more air = more power Erm, NO. They're too big to start with. The small port head is by far the better one to have, and converting the FWD small port inlet manifold to RWD is also by far the better way to go. when i said big ports=more air i meant to put a questionmark there. thanks bill, you're one of the people i wanted advise from. at this point i WILL NOT be using a smallport manifold as i already have the parts involed. what is the DOWNFALL of using it? i know i will have no power under 4400 rpm now as the tvis is removed but i will have the same airflow going in. is this actually the case? Dodgy_Haro wrote on Wed, 15 September 2004 12:13 The information is in the tech section of these forums - generally in the 4AGTE article which includes the reason why a bigport head was used. From memory, it generally states that it is just a bit too big for N/A application however for 4AGTE purposes, it is ideal. Bill's site also had some info on the flow characteristics of the bigport head under his 4AG article, in particular why TVIS is needed to restrict airflow as it is too much from the manifold. Not sure why an adapter was made to put a RWD bigport head to a small port head however one would conclude that the previous owner didn't know how to cut n weld, put it on then found it didn't performed well hence sold the adapter for next to nothing ... i need to keep my intake intact for when i use it for my old bigport head again in my spare car. so i just dont wanna chop it. (also hard to find to boot) i also realise partly what i am sacrificing, i jus want clarification from bill or others wth much experience the adapter is used for exactly as koen said. easy swapping of parts, not as you say "the previous owner didn't know how to cut n weld". koen wrote on Wed, 15 September 2004 12:24 I thought T3 sold these adapter plates? Anyone know their reasoning behind making/selling them? Is it just because it's easier to use a bigport RWD manifold than modding a FWD smallport manifold? Also, if the bigport heads are shite for NA applications, why is it that people put the bigport head/manifold on the smallport block? I thought this made quite a nice NA hybrid engine? Sorry for the hijack http://www.technotoytuning.com/t3_site_pages/produ cts/port_adapter.html yes thats where mine is from. Dodgy_Haro wrote on Wed, 15 September 2004 12:32 You're forgetting the TVIS system ... up to a certain point, there isn't any problems as the TVIS compensates in the lower RPM range on a stock motor. Once you start playing with it and go with bigger cams, there comes a point when you no longer need TVIS. In Garth's case, there is no TVIS hence there won't be any butterflies to close off the intake, especially in the lower RPM range where it counts most. Just cut n weld the small port manifold Garth - as Witzl said, it's cheaper and there's even a step by step instruction guide on these forums. once you surpass the cam profile that the stock ecu can handle, you also dont need tvis. at the moment i have std cam profiles so i will be losing a little power. i understand why everyone says to go with smallport, i was simply asking with my current parts what i could do to improve airflow and restrict as much air turbulence as possible. koen wrote on Wed, 15 September 2004 11:44 Is anyone going to answer the question that ae86drift actually asked? I'm interested in hearing the answer, even if it's not the best way to do things. bill has kinda answered it. any further comments on this billzill-o? ive read your site, but its not QUITE the info im after. [Report message to a moderator]

	Subject	Poster	Date
	AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	ae86drift	Tue, 14 September 2004 14:11
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	THE WITZL	Tue, 14 September 2004 14:14
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	ae86drift	Tue, 14 September 2004 14:55
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	Bill Sherwood	Wed, 15 September 2004 00:51
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	TurboRA28	Tue, 14 September 2004 23:05
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	THE WITZL	Tue, 14 September 2004 23:31
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	ae86drift	Wed, 15 September 2004 03:21
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	THE WITZL	Wed, 15 September 2004 01:26
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	Dodgy_Haro	Wed, 15 September 2004 01:27
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	koen	Wed, 15 September 2004 01:44
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	THE WITZL	Wed, 15 September 2004 02:02
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	Dodgy_Haro	Wed, 15 September 2004 02:13
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	koen	Wed, 15 September 2004 02:24
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	Dodgy_Haro	Wed, 15 September 2004 02:32
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	THE WITZL	Wed, 15 September 2004 02:37
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	jasonp1977	Wed, 15 September 2004 05:04
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	koen	Wed, 15 September 2004 05:31
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	ae86drift	Wed, 15 September 2004 10:19
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	ae95	Wed, 15 September 2004 11:00
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	ae86drift	Wed, 15 September 2004 11:27
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	EVOSTi	Wed, 15 September 2004 11:16
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	monkeymajik	Wed, 15 September 2004 11:23
	Re: AE86 4A-GE TVIS Manifold onto AE92 4A-GE 'Smallport' Head	EVOSTi	Wed, 15 September 2004 11:33

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