albertz
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| posted on 1/5/05 at 06:39 PM |
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4AGE power problems?
I am almost finished my car and took it out the garage for its first serious test drive yesterday (SVA booked 11th May). There were a few very minor
teething problems, but otherwise fine.
I did notice that the car did not appear very lively, which was not what i had expected.
I have a standard 4AGE engine mated to a type 9 box. The engine is completely standard with the exception of a cheap air filter, modified inlet plenum
(reduced to clear bonnet line) and a home-made stainless steel exhaust. The other mod is the removal of the TVIS system, i have just left the sensors
connected and clipped out of harms way.
I have set the ignition timing and the car revs perfectly well when sitting in the garage.
When it is run on the road it seems slightly dull until about 5000rpm, then it seems to 'clear' itself and takes off.
Is there something simple that you might know of which i may have missed?
I am thinking that a local garage might be able to adjust the settings, but they havent been altered since the engine was in the donor.
Any suggestions or advice appreciated.
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tks
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| posted on 1/5/05 at 10:14 PM |
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TVIS
wy did you took it of?
think thats the reason, manufactures don't do things for nothing...
obviously the mixture isn't right..
"free reving" is always in the lower throttle part of the engine..(you never give full throttle...//engine cant get to that amount of fuel
because of rev limiter)
also free reving is allot of air...but when driveing you need petrol  to move...
TKS
The above comments are always meant to be from the above persons perspective.
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dmottaway
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| posted on 1/5/05 at 11:03 PM |
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that is the whole point of the TVIS system. It restricts the throttle bore to increase charge velocity. Then, about 4800rpm, the butterflies open to
allow unrestricted breathing.
most who take off the TVIS, or whose TVIS is defective, report the engine as being "flat" until the rpms get to the upper end.
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albertz
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| posted on 2/5/05 at 07:18 PM |
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The two engines i have, one has TVIS and the other doesn't.
Am i right in thinking that the ECU will be programmed to work with the TVIS and is having problems because the TVIS is not there.
Therefore, would it be worth using the other ECU, or would that lead to further problems?
I am sure some of the other 4AGE users on this site have discarded the TVIS, have they all had the same problems?
Thanks for the opinions so far.
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ChrisJLW
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| posted on 5/5/05 at 03:27 PM |
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Sounds like you've got two different generations of the 4AGE there. The one without TVIS is from the 1990-92 Corolla and had 130bhp stock,
smaller inlet ports and larger 250cc injectors. The TVIS 4AGE was fitted in the MR2 and older Corrollas had 122bhp, larger intake ports and smaller
215cc injectors. Have you mixed any of the engine management systems as they will definately have different mapping systems.
As mentioned removal of the TVIS doesn't help with the responsiveness of the engine. I don't think changing the ECU's will help as
the Non-TVIS will be setup for a different fueling system, but might be worth a go!
HTH
Chris
[Edited on 5/5/05 by ChrisJLW]
I've lived a life that's full.
I've traveled each and ev'ry highway.
But more, much more than this,
I did it side-ah-ways.
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albertz
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| posted on 6/5/05 at 06:54 AM |
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Your right........i have never actually compared the ECUs, but when i attempted to swap them the plugs are different size. So thats the end of that
little idea!!
The problem i have is that i had to use the plenum from the non-TVIS engine, so that it could be easier modified. It does not work with the TVIS
system though and cannot be fitted. That is the reason that i binned it.
However, i am now thinking of trying to modify the TVIS plenum somehow and reinstall the TVIS thingie. My first impressions of the engine were not
great, until it was high revving. But then on the other hand i will probably be driving it high up on revs anyway. I will try it and see what like.
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paulbeyer
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| posted on 6/5/05 at 12:29 PM |
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Although my car isn't running yet, I also binned the TVIS system. Partly because of the difficulty of trying to modify the TVIS inlet
manifold/plenum and partly because of the recommendations of others, including Rob Lane and Raw Engineering.
Hopefully Rob will be along shortly with a few wise words.
7 out of 10 people suffer with hemorrhoids. Does that mean the other 3 enjoy them?
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DEAN C.
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| posted on 8/5/05 at 03:24 PM |
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Hi,I have left my TVIS on and fitted the standard earlier RWD manifold which JUST fits under my ally bonnet although my engine sits low as well.
I think if you read all the Australian info they only recomend taking off the TVIS at higher power outputs or you will lose the lower torque.
If you cannot fit an earlier manifold (which is much harder to chop) I would fabricate a steel inlet as Eddy Mc Clements has done and keep the
butterflies.Optionally you will have to find a later small port head,which will fit straight on without using your TVIS set up.
All the best DEAN......
PS.Mine WITH TVIS goes like stink!
MK was so impressed he is fitting one into the NEW Seven!
Once I've finished a project why do I start another?
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paulbeyer
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| posted on 10/5/05 at 09:16 PM |
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Dean,
I read the posts on the Aussie sites and also came to the conclusion that the losses would be on lower end torque. As the seven is a hell of a lot
lighter than the donor you really shouldn't see that much of a difference. I know Rob Lane has dumped his TVIS and hasn't suffered any ill
effects.
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tks
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| posted on 10/5/05 at 09:24 PM |
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pfff
Guys,
it cant do any good to the engine.
And because we don't know how the mcu is programmed??
maybe it enters backup mode??
- less HP
- more consume
- less torque
offcourse just my 2p
TKS
The above comments are always meant to be from the above persons perspective.
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DEAN C.
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| posted on 11/5/05 at 07:13 PM |
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Hi Paul,Rob has the later head with the smaller ports (non TVIS) set up!
Hence he does not nor ever has had TVIS.
I bought his first engine after he ran the crank and then helped a little when he fitted the next engine.
To be qute honest I dont really know how much difference it would make removing the set up fron a large port engine, but it must make some ,as Toyota
wouldn't redesign the head for nothing.
It may be something completely different,the usual fault is air being dragged in from the manifold or fittings to it.
All the best DEAN.........
Once I've finished a project why do I start another?
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