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Old 02-06-2018, 04:35 AM   #1
fork
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Default Boosting a redblock with stock ECU's

I have read a few threads that I can't seem to find anymore, where there were people that had boosted redblocks with no change to the ECU, injectors, etc.. All they did was swap the manifold, installed an intercooler, and extended the wires for the MAF. They ran about 5-6 PSI safely without blowing it up.

I am in the process of doing the same thing in my 1984 245. I have sourced out the manifold, turbo, downpipe, intercooler. Currently looking for an oil pan with pre-drilled oil holes.

Anyways, all said and done.. Should I be safe running my LH 2.1 with 5 PSI of boost? I'm going to do it anyways but I'm just looking for some input- maybe those threads that I read..

Thank you
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Old 02-06-2018, 08:52 AM   #2
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Yes you can do it, but why would you want to skip the easiest step? I can go to the salvage yard and pull some turbo ecu's from a 2.1 in a few minutes.
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Old 02-06-2018, 09:34 AM   #3
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I have to agree. I am doing my second JY turbo setup, and don't think the ecu step is really worth skipping. Between TB, junkyard, and ebay. You should be able to get ecus for $50-$100.
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Old 02-06-2018, 09:49 AM   #4
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So you want a turbo car without any of the safety that a turbo ecu offers. If you don't have a budget for the correct parts now, will you have the budget for a replacement engine later?

Don't rush it. Collect the proper parts and THEN boost it.
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Old 02-06-2018, 09:54 AM   #5
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OP is saying he has LH2.1...IIRC there is not a turbo version of this generation of LH Jetronic, so not simply an ECU swap as is the case with LH2.2/2.4.

https://www.ipdusa.com/techtips/1008...n-my-volvo-240

OP...I'd dig into the wiring diagrams and see what the differences are between LH2.1 and 2.2 and see if you could change your wiring to match LH2.2 and then grab and ECU from an early 740T.

IMO boosting w/ the n/a ECU is playing with fire and asking for problems.
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Old 02-06-2018, 10:22 AM   #6
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Op can easily convert over to 2.2 for the time being(using a 2.2 turbo ecu) and turbo car which will cover fuel. Later on he can do ezk ignition or breakerless. Not that big of a deal. But yeah you don't want to use the na ecu for too long. It's fine to do in stages.
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Old 02-06-2018, 02:35 PM   #7
fork
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Unfortunately there is only one turbo Volvo in all the junkyards where I live. It's running LH2.4 and I believe it still has ECU''s. My plan is to just do a simple turbo swap for the time being and eventually find a 1994+ redblock paired to an AW71 with low mileage. Then I'd do a full proper swap rewiring the whole car, as there are a couple things that don't work. I do have another daily as well incase things go south.

I will read into some wiring diagrams and see what needs to be done to swap ECU, but most likely I'm going to run my 2.1 for science. If I hear anything funny while driving I'll have to avoid flooring it I guess.
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Old 02-06-2018, 02:44 PM   #8
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Quote:
Originally Posted by fork View Post
Unfortunately there is only one turbo Volvo in all the junkyards where I live. It's running LH2.4 and I believe it still has ECU''s. My plan is to just do a simple turbo swap for the time being and eventually find a 1994+ redblock paired to an AW71 with low mileage. Then I'd do a full proper swap rewiring the whole car, as there are a couple things that don't work. I do have another daily as well incase things go south.

I will read into some wiring diagrams and see what needs to be done to swap ECU, but most likely I'm going to run my 2.1 for science. If I hear anything funny while driving I'll have to avoid flooring it I guess.
https://forums.tbforums.com/forumdisplay.php?f=14

You do realize you can just make a wanted post for ECU's/injectors on here and have mr UPS bring em right to your door....
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Old 02-08-2018, 04:12 PM   #9
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The Bosch 507 ECU from a B23FT is a drop-in for the 83-84 B23F. There is a pin on the ECU that connects to the EZ-115K ignition (which the B23F doesn't have) but you can ignore it.
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Old 02-09-2018, 12:21 AM   #10
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Yeah lh 2.1 to be 2.2 is easy
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