1GGTE TVIS + Aftermarket ECU and BB Turdbro

[Toy77]

hahahaah

your motor, make a decision!!!!

anyways another thing to consider.....

i think when we removed the tvis plate from steves motor, the plenum or runners hit the alternator requiring a custom bracket???? this may have been due to the custom plenum (on stock runners) but i cant remember - something to measure.

just to stir the pot... the twins had very little lag. people mis-use the term "turbo lag" often getting it confused with boost thresh hold.

boost thresh hold is the point when the turbo is on boost - rpm eg 3500rpm

turbo lag is how long it takes the turbo to make boost when above that threshhold.

ie if your factory turbos start boosting at 2500 rpm, and you are cruising down the freeway at 3000rpm (not on boost - cruisin) and you nail the loud pedal - how long does it take to come on boost - this is turbo lag

Cheers
Stew

[Toy77]

may have also been the forward facing throttle body too.....

[Cuzzo]

Does the manifold bolt up without needing to welding anything up.

4age have something not so simple about removing tvis applies to here?

[web]

Why not get rid of all those fitment issues by simply putting a gutted TVIS plate in.

[Kedderz]

Thats what I will be doing web

[web]

Oh and about the stock control system...

You're right, the actuator does open without vacuum applied to it. Here's one from a 4AG at rest.


But that's what the vacuum tank is for. It does not act as a buffer to manifold pressure, it acts as a vacuum storage device, just like the brake booster does, with a 1-way valve at the inlet. The brake booster too, is always charged with vacuum, even when you're boosting. So is the little TVIS vacuum tank. Its flimsy plastic construction would probably rip apart if you applied 20 psi of boost to it Fortunately the 1-way valve keeps boost out.

Using that vacuum tank, the ECU can control the TVIS butterflies and close them even when boosting, or open them at vacuum (by shutting the vac tank port and connecting the actuator to a bleed). That's what the 3-way VSV does, connect the actuator to either the vac tank or to an atmo bleed (right on the pic).

Not trying to convince (you've made up your mind), just making sure when this thread turns up in a search, the info about how TVIS is really controlled from the factory will be there =)

[Kedderz]

Id rep you web, but I already have before.

Good info and finally some solid information about the 1g TVIS!

[web]

Thanks, good to hear people appreciate that stuff, even though it's not always what they want to hear

And having only recently rejoined this group, I had some catching up to do in the rep department anyway

[YLD-16L]

Why not get rid of all those fitment issues by simply putting a gutted TVIS plate in.

Or one step better and fit a phenolic spacer in its place

[SillyCarS]

what the fuck is a phenolic spacer

[Kedderz]

I think he mean phallic spacer knowing shane


*sarcasm

[ddeane]

'The phenolic spacer aids in keeping the plenum chamber cool while the rest of the engine is steaming hot, in general terms this is good as it reduces the ...'

Thank Google

[SillyCarS]

um ok

are they expensive? surely no one produces an off the shelf version for the 1g

[Kedderz]

check the fitment with the TVIS removed before you go spending money on something with dubious benefits.

[SillyCarS]

i think mines sweet actually, just wondering