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Old 09-05-2007, 05:54 PM   #1
Omnipotent15
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Question 740 T '88 P.o.s

First Thread here:
I purchased a beater from a friend's friend. Volvo 740 T sedan from 1988. It came with very many problems to start out with. One of my friends had the idea of making a manual boost controller out of local hardware parts. We went along getting the parts, but couldn't find a cheap enough gauge that fit our parts, so decided to try and "take it slow", using the stock turbo gauge. it successfully got hooked up, and we got about 4 runs in, tweaking the MBC. We thought we were getting down to the PSI we thought we needed, (the stock gauge doesn't have numbers, just a yellow zone) when we thought of doing a third gear pull from 20mph. obviously it didn't do much for the first few seconds, all of a sudden it PULLED, i looked down and saw the needle pointing a bit past the "O" (it says Volvo on the bottom of the gauge, so almost pointing straight down). i have no clue how much psi this really is, but was figuring stock was 6 or 7, and it usually got about halfway through the yellow zone at most.
Needless to say, the car didn't last too long, the second time we tried a run, it got somewhat close to the "O", we heard a nasty clunk, and white looking smoke was billowing out the back end more than a jet at full throttle. this was after dark already, so i'm pretty sure the smoke looked white, can be wrong. it had a nice trail of what smelled to me like coolant (i'm kinda new at this so i may be wrong).
The funny part is, the engine was still on and turning after i realized i should pull it over and stop it, and after i pushed in the clutch. I had to actually take the key out to turn it off.
I will be able to take pictures of it in the next day or so, but my friend and I found a piece of metal that said B2 on it, if that helps.

Any guesses on what exactly we blew up? Is it something inexpensively fixable? I won't be taking it to a shop, I will be trying to fix it myself with a few friends in the know.


Thanks in advance guys
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Old 09-05-2007, 06:00 PM   #2
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Danger to teh wastegate?
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Old 09-05-2007, 06:07 PM   #3
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My stocks gauge pegs out around fifteen iirc. The white cloud is coolant in your exhaust from a blown head gasket. You can do it yourself but you will probably have to have a machinist skim the head.
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Old 09-05-2007, 06:21 PM   #4
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can you elaborate on the "skimming the head"?
how much do you think this may cost?
and is there anything else I should be checking to make the diagnosis more complete?
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Old 09-05-2007, 06:26 PM   #5
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Quote:
I will be able to take pictures of it in the next day or so, but my friend and I found a piece of metal that said B2 on it, if that helps.
Um, might want to check the side of the block. Your motor has a B230 cast or stamped into it. Was the chunk of metal you found red by any chance? If so, I'd start checking the local yards for a replacement motor. At the very least the head gasket is toast.
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Old 09-05-2007, 06:37 PM   #6
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Your engine is toast. Start checking junkyards for a replacement.

Congrats...an engine that has been known to last hundreds of thousands of miles and be nearly impossible to destroy, you killed in 5 minutes.
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Old 09-05-2007, 06:59 PM   #7
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like this?


guarantee that piece of metal was the B2 of the "B230" and what probably happened with the boost controller you made is it was working at some point then either the hose came off or it was not letting a signal pass and you ran as if the wastegate was disconnected

if you just blew a head gasket, replace it and keep chugging but that piece of metal with the "B2" on it leads me to believe you have thrown a rod into the side of the block and the hole will be on the passenger side behind the turbo if i must estimate its location
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Last edited by 500dollar744ti; 09-05-2007 at 07:08 PM..
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Old 09-05-2007, 07:11 PM   #8
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"If you think education is expensive, try ignorance"
Fitting, no?
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Old 09-05-2007, 07:14 PM   #9
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This has to be a joke. Dupe account?
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Old 09-05-2007, 07:35 PM   #10
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i have no idea who this person is, i just happen to have a picture of my car doing what he was talking about, minus the blowing up part.

how am i being ignorant? i have been trying to blow my motor up for months now and it is just not happening.
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Old 09-05-2007, 08:22 PM   #11
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sorry, not a joke. I'm pretty sure he is calling me ignorant, not 500dollar744ti. I wouldn't quite call myself ignorant, just learning without a teacher.
Also, yes, thats pretty much where the boost gauge said I was at. Again, this car has had many problems and mad experiments done to it before i came along, so I probably had it coming.
If the engine is toast, how is it that the engine was still turning after this incident? was it just moving but getting crap for compression?
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Old 09-05-2007, 08:27 PM   #12
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Quote:
Originally Posted by Omnipotent15 View Post
sorry, not a joke. I'm pretty sure he is calling me ignorant, not 500dollar744ti. I wouldn't quite call myself ignorant, just learning without a teacher.
Also, yes, thats pretty much where the boost gauge said I was at. Again, this car has had many problems and mad experiments done to it before i came along, so I probably had it coming.
If the engine is toast, how is it that the engine was still turning after this incident? was it just moving but getting crap for compression?
probably, but you will have to check it out and see what happened then figure out what you want to do about it.
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Old 09-05-2007, 08:32 PM   #13
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people have had their motors "run" on 3 cylinders with a rod through the block i believe.



also, if the stock gauge is 15 psi, what was he running? 500dollar740, whats the boost when your stock gauge is sitting there?
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Old 09-05-2007, 08:45 PM   #14
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It could be anything at or above 15psi. What is the max that turbo can do?
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Old 09-05-2007, 08:55 PM   #15
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Quote:
Originally Posted by HonestJhon View Post
people have had their motors "run" on 3 cylinders with a rod through the block i believe.



also, if the stock gauge is 15 psi, what was he running? 500dollar740, whats the boost when your stock gauge is sitting there?
that picture is 20psi
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Old 09-05-2007, 09:16 PM   #16
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nice.
and on a stock car, 20 psi is way past the bad zone.
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Old 09-05-2007, 09:50 PM   #17
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yeah but without knowing where i was sitting..
every other run, it didnt get close, so something had to have gotten stuck in my MBC is all i can think of.
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Old 09-05-2007, 09:51 PM   #18
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Originally Posted by Omnipotent15 View Post
yeah but without knowing where i was sitting..
every other run, it didnt get close, so something had to have gotten stuck in my MBC is all i can think of.
or the vacuum line to the wastegate broke/came off
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Old 09-06-2007, 08:47 PM   #19
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You can compare to these quasi-calibrated gauge faces.

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Old 09-06-2007, 08:53 PM   #20
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Quote:
Originally Posted by Omnipotent15 View Post
my friend and I found a piece of metal that said B2 on it, if that helps. Any guesses on what exactly we blew up?
If this is a trolling account, it's funny as hell
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Old 09-07-2007, 03:28 AM   #21
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If this is a trolling account, it's funny as hell
well thanks for the help to those who did, i'm glad I got such a warm welcome, compliments to those with many posts ranging from not-so-helpful to slightly insulting.

many thanks to L8 APEKS, homer1300, and ferret for those quality posts. i hope you go far and achieve much in your lives.
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Old 09-07-2007, 09:38 AM   #22
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Don't be too easily offended around here, people grow thick skins quickly.

I'm surprised the overboost protection didn't cut the fuel. Have you already disabled that?
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Old 09-07-2007, 09:45 AM   #23
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Quote:
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You can compare to these quasi-calibrated gauge faces.
No dice there... that picture I posted with the needle at the "B" in turbo was 20 psi on my calibrated VDO gauge... is that gauge you posted just refaced or a diff unit? That picture up there is 20 psi for damn sure on a stock gauge.
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