megrac

You can call it want you want but the vipec engineers are still the same bunch of engineers that work at Link electro systems NZ. Its funny you call it "Vi-PEC intellectual property" but then there was nothing wrong with giving Link an sm4 plus someone elses "intellectual property" data and telling them to pull it apart and do better. This does mean the worlds leading ecu will still be made and designed by link in NZ with a few wants put into it by vipec. Do you think Link would want their ecu disadvantaged over the vipec "version" This would take a good sum of money to pass into links hand as remember its them doing the building and designing with wants from vipec. Vipec cant and doesn't make ecus ! Also remember there are ecu's out there that make Link g4/vipec ecu's look very very simple and always will, a vipec will never be the "best" or have the best best technology compared to the likes of pectel or life racing ect...

IMO they are not a magic spooling turbo, they spool right for about their size. The bonus comes from them being cheap and strong, nothing more.

No its a 2.5 subaru engine. I don't think running the same housing on a twinscroll manifold will get the same results as running it with the flap on a sc manifold but i have never tried it though, i just can't be bothered making the manifold twinscroll. My manifold is a nice equal lenght 4-2-1. From looking at what other people have found there seems to be no change in power running a tw or sc housing on a sc manifold. You can gain from running a tw housing on a ts manifold but if it beats the flap or not would need to be tested on the same engine. I have many datatlogs of egbp/boost with the flaped housings but i wouldn't want to litter this thread with it. What a started out saying in my first post was bigger turbines need bigger housings to see the best gains from them. If you clamp a good sized turbine with a small housing you end up with a pig of a turbo that cant make good power. You may as well step down in turbine size and use the right sized housing for it.

On my engine and the holset's i've made they have always liked the larger turbine housings, egbp goes through the roof with the smaller housings, fine if your engine setup doesn't mind it so much but mine hates it. Spool is ok but i have a flap in one scroll that opens when full boost is reached(TS housing on SC manifold), this works so well more people should do it, there's a good 4-500rpm in it. This means you can move to a very large housing. With a 2.5L my holset hx40/50 67mm exducer turbine/63mm inducer compressor, 14cm housing gets 1bar at 4250rpm in 3rd. I've made a few garretts of similar size but never really liked them compraed to how the same sized holsets have performed, the hx3540 with the billet 60mm compressor is a great turbo.

Wouldn't the main restriction in a housing be the start of the scroll just befor it opens up to the turbine not the area that enters the inducer of the turbine? This is where other manufacturers like mhi and holset get the cm^2 from, this would mean going to a larger turbine for the same housing would not get you all the gains the new larger wheel has to offer. I've been making a few holsets over the past months these include using the 14cm and 18cm housings from an hx35, things i've found is an hx40 67mm exducer turbine has the same egbp in a 14cm housing as a hx35 60mm wheel in an 18cm housing, i would of thought a larger egbp drop would of been recorded but if you think about it we still have a 14cm restriction. Thoughts?

Not as good as others for accurate timing control with the factory nissan cas, This was first hand experience, when we changed to a real crank trigger all was fine. Ather than that its a nice ecu. If you dont ever use datalogging or the ecu yourself for street tuning i would get a link g4/vipec. Better value.

I've tried many turbos over the years and this one would be the most fun by a long shot, i've tried smaller housings but this engine is very fussy to egbp and will not make good power when its to high(the top end will just drop right away), this turbo has about the lowest egbp for its boost resonse i've found so far without spending too much money. I only paid for a new compressor wheel and a rebuild kit, the rest was free and i have a turbo balancer at home so that makes playing with turbos easy.

This engine has headers that i would say have alot more volume than rb headers also it has very retarded intake cams, remember this is a subaru, they are crap. If it was a newer one with avcs cams spool would be alot better. My engine has never spun up turbos well. Even my old trust td06 20g took till 3.9k to get 1 bar in 3rd. I just live with it.

Boost. afr. The hx35/40 14cm seems to behave alot like a 35r for spool an power on these subarus but i know what one will last longer. There is more power to be had here with more boost but i wasn't keen to start breaking stuff. egbp/boost pressure ratio at 7k and 1.47bar is 1.4:1 That spool is about what i see on the road in 3rd gear, 4th is about 1 bar at 4.2k

I've rebuilt a few holsets and made a few mixes of them, i've never had any problems with them going back together. I made an hx35/40 for myself using an hx35 turbine, 60mm 6 blade hx40 compressor and an hx35 14cm turbine housing. This is on a 2.5L subaru but rwd for dynoing. Was happy with the result. Good turbo !

You would be crazy to use a vipec ecu in NZ, go to your nearest link dealer. If you can drive up to whangarei trickytune is a dealer and has done many pnp g4's Anyone who tunes link g4's can tune a vipec as they are the same thing. Btw GCP are the nz vipec dealer.

There's nothing missleading about the Autronic product its as it was just without Ray hall selling it to his deallers. The vipec is a rebadged link g4 but thats not to say it didn't have input from Ray. I have seen many nissan g4 plugins come streight from link.

Sorry but Ray Hall was only an Autronic Dealer with his own dealer network, he needed to have an ecu that his dealers could use so thats why he influenced Link to have the fueling control setup like the Autronic. This is were the G4/vipec ecu's came from. The man who develops Autronic products is callled Richard Aubert, nothing to do with Ray. Ausy Made needs to be removed from the main post heading as that is a lie. Rays sema stand even included a man from Link NZ.

So why do we have a link product with an afr table setup and autotune like the autronic ecu's, i think i see were the "influence" is, Its taken straight from Autronic and injected into Link

I would also like to know what the differance is between the v88 and the link g4 xtreme? 100% the same features/software, differant name and about 2 months more bit at the market by the looks. Look at the pics some of the plugins on the vipec site they have "link g4" covered over on the pcb ! I wouldn't call it "far more" than a rebadged link! Also his efforts of trying to say that Autronic has a timing problem is a joke. Money making at its best.