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Eric's '90 80QT: this is not cool

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 Post subject: Re: Eric's '90 80QT: rustic bits
PostPosted: Sat Jan 07, 2017 1:11 pm 
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mach 2 with my hair on fire
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Location: Sitting in traffic North of Boston, MA
Yeah I know... that's why the B4 pump is in there!

I'm hoping I can come up with a creative way of mounting it... wish me luck!

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'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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 Post subject: Re: Eric's '90 80QT: rustic bits
PostPosted: Wed Apr 19, 2017 9:39 am 
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Location: Boise ID
Eric,

I do have a spare pump if you still need one. Please feel free to text me at 5(four)1 7oh1 7983 if you want the pump as I don't get on here at all anymore.

I was trying to figure out what you did for a flywheel in this car. Did you go with an aluminum something or other or are you using a stock one? Did you do any looking into a 2.7t flywheel? it's rumored to fit the 016 and has the 8 bolt pattern and also has a 60-2 ring on it.

AJ

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 Post subject: Re: Eric's '90 80QT: rustic bits
PostPosted: Wed Apr 19, 2017 9:43 am 
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Location: Sitting in traffic North of Boston, MA
Hey thanks!

I actually did get a pump... now all I have to do is make up some adapters to attach it to the engine. Should be a pretty easy task if I can ever find the time!

For the flywheel I used one from a 3B. I didn't know about the 2.7t one... it would have been great to have the 60-2 on it!

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Eric Law
'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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 Post subject: Re: Eric's '90 80QT: EBC (evil boost control)
PostPosted: Wed Jun 07, 2017 11:10 am 
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Location: Sitting in traffic North of Boston, MA
So it's been a while since I had anything of note to report here... not for any bad reason, the car's just been working! But that may change soon. :wink:

Why you ask? Well, because I just installed a 4-port boost control valve:
Image

For those that don't know, a 4-port boost control valve can use boost to *close* the wastegate as well as open it. And while that may sound crazy, there's a good reason for it.

To give a nice gradual throttle response, I like to run a soft (5 PSI) spring in the wastegate. That's fine for the most part, but at high boost and high RPM, the engine will experience boost droop even when there's no pressure being applied to the wastegate. Why? Because the pressure in the exhaust manifold acting on the wastegate valve is actually enough to open it!

So my solution is the 4-port valve. Under those conditions, it can actually supply a little boost to the top of the diaphragm to hold the valve closed. And I get to keep the driveability that I like with the soft spring. Win-win! :-)

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Eric Law
'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Thu Jun 15, 2017 3:56 am 
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Okay first things first: the new boost control setup is working great! I can get pretty much any amount of boost I want at any RPM (well, any *high* RPM) where previously I couldn't get more than about 14 PSI at 7K. The only drawback is that the Megasquirt can only control the valve PWM value in increments of 1% and the setup is very sensitive: sometimes a 1% change will mean 1 PSI or more of boost.

And now on to today's disaster. I finally got tired of the POS rusting Nissens radiator I was running, and decided to swap in the brand-new Behr one I bought a while back. The location of the ABS pump in my car makes swapping the radiator a bit more difficult than normal: you can't get the radiator out with the fan attached, so you have to detach the radiator, move it forward a bit, unbolt the fan, then the radiator comes out. Not a huge big deal but a bit of a PITA.

Anyhow, I take out the old radiator, note several troublesome differences between the old and new, make some mods to accommodate the new radiator, and install it. I start putting coolant in the system, and note there's a leak where the upper hose attaches. No biggie, I just didn't tighten it enough, right? Nope, my effin' brand-new radiator is damaged! There's a big crack in the tank just below the upper hose fitting. I'm not sure if it happened when the unit was shipped to me or in storage, but it's thoroughly busted. :frustrated:

Anyhow to make a long story short, I removed that radiator and installed the one that originally came with the car which thankfully I kept. And driving to work today, the engine ran about 10 degrees cooler! That Nissens truly is a piece of crap.

Finally, as always I have a question: has anyone ever removed and reinstalled a tank on a modern radiator and lived to tell about it (and had the radiator live)? By "modern" I mean one with an aluminum core and plastic tanks. I seem to remember reading about someone doing it here but can't remember where. If I could R&R the top tank on this radiator I think I might actually be able to fix it.

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Eric Law
'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Thu Jun 15, 2017 4:20 am 
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Eric - the trick to removing the radiator in a B3/CQ is to detach the condenser on the front (2 or 3 10mm bolts to the radiator), disconnect the front radiator mount, loosen the fender mount ( nut just forward of the hydraulic fluid reservoir) remove the bottom mount nut, disconnect the fan harness, remove the three 10mm bolts holding the fan to the shroud, pushing the fan into the radiator, lifting and tilting the condenser forward to lift it off the two upper mounts on the radiator, then lift the radiator/shroud fan assembly up and out.

I've had some radiator work done by Lowell Radiator, but he won't touch radiators with plastic end tanks. The cores are crimped over a flange on the plastic end tanks and that compresses an o-ring between the two. the trick is getting that end tank to seal after you reinstall the end tank..

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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Thu Jun 15, 2017 5:07 am 
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I have succuessfully JB welded cracks at the top hose connection on those plastic end tanks on a b3 90 before. I didnt like it, but it held with no issues.

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-1990 90q 1.9tdi swap w/holset turbo
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-1990 90q 20vt: 11.7 @124.5
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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Thu Jun 15, 2017 7:56 am 
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death 4kqt wrote:
I have succuessfully JB welded cracks at the top hose connection on those plastic end tanks on a b3 90 before. I didnt like it, but it held with no issues.

From the outside, I assume?

I was going to try JB weld too, but figured there would be a greater chance of long-term success if I could do it from the inside.

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Eric Law
'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Fri Jun 16, 2017 4:12 pm 
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I take it that stroker bottom end is looooong gone, huh?

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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Sun Jun 18, 2017 5:49 pm 
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Oh yeah, years ago.

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Eric Law
'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Mon Jun 19, 2017 5:55 am 
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Yes, it was sanded with like 80 grit and applied to the outside and it did work. Not saying its a good idea, but its a data point.

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-1990 90q 1.9tdi swap w/holset turbo
-4kq efi'd 10vt
-1990 90q 20vt: 3b swap
-1990 90q 20vt: 11.7 @124.5
-numerous other various junkers


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 Post subject: Re: Eric's '90 80QT: this is not cool
PostPosted: Mon Jun 19, 2017 6:11 am 
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Hey that's cool! At least it indicates the JB weld adheres well.

I think I'm going to try to remove the tank and epoxy it on the inside. I figure I've got nothing to lose except time as the radiator is junk anyway.

I've actually R&R'd the tanks on an intercooler of similar construction and it worked afterward, but small leaks are more of a problem in a radiator than in an intercooler... :roll:

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Eric Law
'90 80Q with AAN and Megasquirt
'97 Saab 9000 Aero: mostly stock but ECU tweaks to add fastness
'86 4KTQ: R.I.P.


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