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Re: T-vis gone bad, engine damaged

PostPosted: Tue Aug 28, 2018 12:18 pm
by 88gt4DE
Looks great.

Re: T-vis gone bad, engine damaged

PostPosted: Mon Sep 03, 2018 1:15 pm
by Gert
She is back:

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Re: T-vis gone bad, engine damaged

PostPosted: Mon Jan 07, 2019 2:49 pm
by Gert
Car is running strong, but massive boostcreep with the CT27. My old CT26 with upgraded T04E creeped to 0.75 bar, but now she sees > 1.0 bar.
Waste gate = 0.6 bar.
Print from Autronic. Second gear. First run without boostcontroller, second with:

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Re: T-vis gone bad, engine damaged

PostPosted: Fri Mar 01, 2019 10:46 pm
by RedCelicaTRD
Gert, I've been to your site quite a few times in my life. Keep up the good work!

Re: T-vis gone bad, engine damaged

PostPosted: Sat Mar 02, 2019 6:10 am
by Gert
Massive boostcreep was due to an sticky wastegate. Perhaps damage with shipping, dunno.

Anyway, solving the sticky wastegate did solve the massive boostcreep, but not the "normal" boostcreep. Next week the turbo is going to be removed and the wastegate ported. It must going te be something like this, found on the world wide web with some MR2 folks:
https://www.dropbox.com/sh/n595gbzv2bhb ... WyLNIAhcqa

On the other hand, I am surprised that ATS is selling an 'super' high flowing turbo, install an 0.6 bar wastegate but do not port the wastegate??? To me, it think that should be part of the deal/package. :shrug:

Re: T-vis gone bad, engine damaged

PostPosted: Sat Mar 09, 2019 12:08 pm
by Gert
Somebody must do it: :D

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Now I did see the difference between de stock turbine housing and the CT27 one.

If time enough, I will post some pics later.

Re: T-vis gone bad, engine damaged

PostPosted: Sat Mar 09, 2019 11:13 pm
by underscore
Nice work! I'm curious to see how much the porting helps.

Re: T-vis gone bad, engine damaged

PostPosted: Mon Mar 11, 2019 2:15 pm
by Gert
Hmm, forgot to mention: the turbo was having an sticky wastegate. First post above I see boost creep was up to about 1.1 bar at 7.500 rpm, but later on, with mapping it was much worse.
She saw 1.4 bar at 5.500 and rising! So we quit mapping and tried to solve boost problems first.

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So, we fixed the sticky wastegate, but that was not enough, still seeing 1.1 bar under wot.

Now, because of the bad Celica intercooler design, I installed an ERL waterinjection system, with an fail safe option. ERL is injecting from 0.7 bar, because the stock wastegate is 0.6 bar. Normally, no waterinjection required with 0.6 bar or less.
So, if I (or somebody else, wife, kids, everybody uses the GT4) are pushing with 1.0 bar and the ERL is going into error, boost is dropping to stock wastegate level. Untill now that always worked fine. But with this kind of boostcreep, the whole fail safe option is useless.

Ported the wastegate now, and hope that we can map the car soon, starting with normal boost levels.

Re: T-vis gone bad, engine damaged

PostPosted: Thu Apr 18, 2019 11:02 pm
by GMan
Glad to see you still working on the car !
Awesome job keeping it running with the rebuilding !

(I am rarely on here, bmelket1@gmail.com :-)

Re: T-vis gone bad, engine damaged

PostPosted: Fri May 31, 2019 5:34 am
by Gert
Busy lately, not much news.

Ported the wastegate. Ported too much. Burnt a whole in the turbinehousing while boosting and let it weld by an professional welder. Hope it holds.
Anyway, the porting went so good, boost is not getting higher than 0.7 bar now. Even if I disconnect the waste gate actuator: still 0.7 bar...sigh.
Probably the wastegate is not strong enough to keep the door closed. So, more testing to do, but no time left. Not really a problem since furtheron, the car goes strong and runs really well.

Strange problem: because the oilfilter adapter plate came loose on the highway, suddenly I saw a big cloud of blue smoke behind the car and massive oil loss. Car was towed away:
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Luckily for me, I could switch off the engine immidiately and no further damage. No strange noises and good oil pressure. Drove about 5.000 kms since that happened.

As soon as I have time to modify the waste gate actuator I can test again. But, since I have an other project car with heating/airco problems, the Celica is second.
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Re: T-vis gone bad, engine damaged

PostPosted: Mon Aug 12, 2019 8:39 am
by Gert
Bummer, old cars is always something.
Since the engine is running on 3 cilinders with cold start, I checked compression. Well, cilinder 3 is having 6 bar and 4 is having 8 bar = not good.
If warmed up, the engine is running on four cilinders. Dunno why, nothing happened. I even was not able to reach high boost due to wastegate problems.... sigh.

Discovered water in the boot (under the sparewheel) too??? Used an garden hose to check where it is coming from. Appears to drip under the rubber seal. Removed the rubber and discovered a rust spot there. So, that needs to be fixed too. Double sigh.

Re: T-vis gone bad, engine damaged

PostPosted: Tue Aug 20, 2019 2:07 pm
by Gert
In the mean time, received an Forge actuator. Destroyed an old leaking CT26 actuator to test fit the forge on the old bracket:

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Re: T-vis gone bad, engine damaged

PostPosted: Tue Sep 03, 2019 2:40 pm
by Gert
Well, the car is at the hospital.
Appears that all exhaust valves are exact on specs and most inlet valves are to tight???
This results in leaking compression cilinder 3 and 4.
We are hoping to solve this problem with thinner (custom) shims.
To be continued...

Re: T-vis gone bad, engine damaged

PostPosted: Thu Sep 05, 2019 6:15 am
by Gert
Installed thinner shims and compression came back... pfwiew. Lucky me, no burned valves!
Car is back again.

Re: T-vis gone bad, engine damaged

PostPosted: Thu Sep 05, 2019 5:12 pm
by underscore
That's something I wouldn't have thought of if I had low compression. Are the shims difficult to change in the car?