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Old 03-27-2017   #1501
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Re: Project Lex

Small update. Did a quick compression test on the motor. Got 165-170-165-165-172-165. Albeit the motor was cold, but none the less I thought that was a pretty good initial sign. I'd like to do it again with the motor warm, but until I've checked over some more things I'd rather not get things hot yet.
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Old 03-27-2017   #1502
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Re: Project Lex

I didn't realize a hg issue would impact compression numbers, unless it was totally destroyed. Slightly warped might only leak at high boost pressures.
Regardless, 219 shouldn't be hot enough to break anything, but that's only where the temp sensor is, not necessarily at the hottest point. Good luck, hoping for the best for you!
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Old 03-28-2017   #1503
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Re: Project Lex

Well a HG can fail in several different ways, and at several levels of severity. Depending on how it failed, a comp test may or may not show anything. I have a compression tester, so why not just spend 30 minutes to see if it showed anything. If anything, I think the results tell me there isn't a massive HG failure between two cylinders, or anything like that. And also tells me in general this motor still has healthy compression as those numbers I feel are excellent, so that's nice.

Next on my list are:
- Use brownman's coolant pressure tester to see if I can spot any coolant system leaks and fix any we find.
- Drain oil and coolant and see if it looks good or if there is any signs of mixing. If all looks good then just refill.
- Troubleshoot and fix radiator fans.
- Get wheels repaired, re-finished, and buy some new tires for all 4 wheels.
- Inspect under the car in general to see if I messed anything else up.
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Old 03-28-2017   #1504
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Re: Project Lex

Grabbed brownmans tester over lunch and ran home and did a test. Pumped it up to about 14psi and not a single leak in sight, which was kinda promising actually.

I drained out the coolant to see if there was any signs of water/oil mixing. No signs at all, still looked good as new. So I think I'm going to skip draining the oil and looking at it because so far everything is looking good.
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Old 03-28-2017   #1505
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Re: Project Lex

Sounds great! I agree, unless there is foam on the underside of the oil cap or on the dipstick, I wouldn't bother with the oil. This really all does point to the radiator cap being worn/weak and just not holding the pressure needed to raise the boiling point. Most coolant boil/freeze charts assume the cooling system is pressurized to 15psi.



Note the column at 0 psi with a 33-44% mix; pretty much right where you boiled over. Fun fact, the C7 uses a 20psi cap (most are in the 12-16 range) which explains why it can run such hot temps without boil over issues.
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Old 03-28-2017   #1506
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Re: Project Lex

The cap is a 0.9 bar cap. Maybe you are onto something, I will probably grab a new cap to be safe then. See if Stant makes one or something for this car. I see what you're getting at, but on the same note I don't think that the cap is holding in zero pressure, but perhaps it just opened up at some amount of pressure, thus relieving the system of pressure putting it down to 0 once it opened up, then the boiling started and kept going from there.

Thanks for the ideas!
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Old 03-28-2017   #1507
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Re: Project Lex

Stant, Gates, etc. all make a .9 bar (13 psi) cap for your car. I'm sure one of the local parts stores has to have one in stock for under $10!
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Old 03-28-2017   #1508
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Re: Project Lex

Yeah, just take a look at the dipstick, on the oil cap, and in the head through the oil cap opening (with a flashlight). If everything looks normal(no milky look). Appears all is well.
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Old 03-28-2017   #1509
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Re: Project Lex

Yeah I see local places all have replacement caps. I like the kind with the little lever on them if I ever needed to manually relieve pressure (had that style on my DSM).

What interesting is 13psi seems to be the norm of the SC (also norm for a DSM). But a supra is the same cap but rated at 16psi (like an evo). Wondering if I should go with the higher pressure version.
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Old 03-28-2017   #1510
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Re: Project Lex

More Supra parts! Seems like we just had this conversation HAHA

For a high performance engine adding more cooling capacity is never a bad idea, but it will put more strain on the remaining stock cooling components.
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Old 03-28-2017   #1511
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Re: Project Lex

Looks like there are some 1.3 bar aftermarket offerings for the Supra too.
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Old 03-28-2017   #1512
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Re: Project Lex

Yeah, I think I'll just stick with the 0.9 bar SC one. If it becomes an issue, then I can upgrade to the 1.1 bar Supra one. But might as well not stress the entire system any more than it needs to be if the 0.9 bar one does fine for what I'm doing.
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Old 03-28-2017   #1513
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Re: Project Lex

Agreed.

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Old 03-28-2017   #1514
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Re: Project Lex

Coolant is refilled. I tested the fans by jumpering 12V to them and they work. I decided to just go ahead and replace the relay that turns them on just in case it got damaged. I started the car, car runs and idles great. As it was starting to get up to temp, I was walking around inspecting things, then I noticed the wiring in the wheel well. What you see in the pic is the black and yellow loom that is the OEM wiring that used to run in the engine bay that I tucked up in the wheel well. Then also my single control wire (and connector) that goes from the fan relay to the Infinity ECU to trigger the fans. When the wheel hit the curb, it must have came up and hit this area and basically ripped that connector apart and left it dangling there. So easy fix, grabbed a new connector and repaired it and tucked it back up there.

Let the car idle for 15-20 minutes. Temp got up to 189 and bam fans kicked on just like their supposed to, then shut off right at 180 when their supposed to. Temp stayed perfect between 180-190. So starting to look promising!

Also dropped the wheels off to be repaired today. Should be done in the next day or two. Gotta get some new tires on order asap.
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1991 TSi AWD E85 - BEP S362, DSMLink V2, Built 2.0L Idle Vid 628hp Graph 541hp Vid 10.93@137 Vid
1992 SC300 E85 - BW 84-75, Vlad Infinity, NA-T, 6spd Idle Vid 709hp Graph 709hp Vid 11.1@131 Vid
2006 Bayliner 195 - Carbed 5.0 Top Speed Test
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Old 03-28-2017   #1515
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Re: Project Lex

Easy fixes are always nice! Get that exposed wiring wrapped up or insulated!
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Old 03-28-2017   #1516
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Re: Project Lex

Everything is heat shrunk and connectorized with water proof connectors. Where is there any exposed wire?
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1991 TSi AWD E85 - BEP S362, DSMLink V2, Built 2.0L Idle Vid 628hp Graph 541hp Vid 10.93@137 Vid
1992 SC300 E85 - BW 84-75, Vlad Infinity, NA-T, 6spd Idle Vid 709hp Graph 709hp Vid 11.1@131 Vid
2006 Bayliner 195 - Carbed 5.0 Top Speed Test
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Old 04-07-2017   #1517
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Re: Project Lex

So while waiting for all the tires to arrive, and for the wheels to get refinished with proline finish, I decided to knock out some other things.

- Installed braided brake lines that I've have sitting here for a couple years now. Went ahead and got the rotors turned while I was at it and flushed the fluid with new DOT4 fluid. Also gave the NA Supra rear calipers a coat of black paint to clean em up a bit and match the fronts.

- Got my new distributor cover design back from Shawn who 3D printed it for me. Fits good except for the ID of the outter portion is about 1mm too tight. So I hand to sand it down and it fits perfect. So I'll be updating the Solidworks model and should be good to go for others to 3D print on their own now.

- Got my two AEM 12 position switches wired into Infinity. One will be for in car boost adjustment. Other for in car traction control adjustment.

- Also got my gauge / switch DIN mount back from Shawn as well who 3D printed it. Haven't fully test fit everything but so far so good, just had to do a little sanding but that's it so far. Once I've verified all fitment I will probably put some sort of vinyl over the front to give it a nice clean finished look.

- Started working on replacing the ABS sensors and then will be wiring them into the Infinity for traction control to function. Plan will also be to use those for a speed signal to the ecu so I can do other cool stuff like boost by mph and what not.
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B-Man - FlexFuel Mafia
1991 TSi AWD E85 - BEP S362, DSMLink V2, Built 2.0L Idle Vid 628hp Graph 541hp Vid 10.93@137 Vid
1992 SC300 E85 - BW 84-75, Vlad Infinity, NA-T, 6spd Idle Vid 709hp Graph 709hp Vid 11.1@131 Vid
2006 Bayliner 195 - Carbed 5.0 Top Speed Test
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Old 04-08-2017   #1518
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Re: Project Lex

Looks good! 3D printing so cool!
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Old 04-09-2017   #1519
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Re: Project Lex

Did they print abs or pla?
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Old 04-09-2017   #1520
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Re: Project Lex

Alpha Bravo Shart
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1991 TSi AWD E85 - BEP S362, DSMLink V2, Built 2.0L Idle Vid 628hp Graph 541hp Vid 10.93@137 Vid
1992 SC300 E85 - BW 84-75, Vlad Infinity, NA-T, 6spd Idle Vid 709hp Graph 709hp Vid 11.1@131 Vid
2006 Bayliner 195 - Carbed 5.0 Top Speed Test
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