'55 R-122 rehab


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Golden Jubilee
Golden Jubilee

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Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Sun Feb 25, 2018 7:46 pm

Re: '55 R-122 rehab

I seam to remember one that had an electric heater grid under the TBI unit, don't remember which one it was, I think it was one of the single TBI units.
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Golden Jubilee
Golden Jubilee

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Joined: Sat Jun 29, 2013 12:58 am

Location: Central IL

Post Sun Feb 25, 2018 8:10 pm

Re: '55 R-122 rehab

Oh yeah! My Caddy had one. It’s a 2bbl. That’s a great solution. I’ll keep that in mind.

The air cleaner does have a preheat stove pipe and a diverter valve built into it.
'55 IH R-122- BG265 w/TBI fuel injection
'64 Porsche 356 C
'68 and '73 BMW 2002s
'86 Cadillac Coupe Deville
'14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)

Golden Jubilee
Golden Jubilee

Posts: 4013

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Sun Feb 25, 2018 8:30 pm

Re: '55 R-122 rehab

It might have been my wife's TBI Renault 1.4 L, It had the GM TBI with a cross flow head, so that may be what I'm remembering .
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Golden Jubilee
Golden Jubilee

Posts: 672

Joined: Sat Jun 29, 2013 12:58 am

Location: Central IL

Post Sun Feb 25, 2018 8:36 pm

Re: '55 R-122 rehab

Seems like I’ve seen a 1bbl heater grid somewhere else as well. I don’t recall where though.
'55 IH R-122- BG265 w/TBI fuel injection
'64 Porsche 356 C
'68 and '73 BMW 2002s
'86 Cadillac Coupe Deville
'14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)
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Golden Jubilee
Golden Jubilee

Posts: 339

Joined: Sat Dec 01, 2012 9:55 am

Post Sun Mar 25, 2018 5:21 pm

Re: '55 R-122 rehab

Curious how you're doing with the new engine and the injection system.
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Golden Jubilee
Golden Jubilee

Posts: 672

Joined: Sat Jun 29, 2013 12:58 am

Location: Central IL

Post Sun Mar 25, 2018 7:41 pm

Re: '55 R-122 rehab

I've been so busy working/caring for my son I haven't had much time to reallywork on it, but I did manage to burn another chip the other night. Version 9 saw me adding 2* of timing across the board, increased in the AE CTS multiplier by a percentage (can't recall what % exactly). The object of that was add more fuel when the pedal is poked on a cold engine. I also added 1-8* of timing to the coolant comp spark advance chart. This allows me to add more timing in a colder engine. There are still flat spots in power band when warm, but the last 2 adjustments made notable changes in the engines response from a cold start. It's much more forgiving when I start driving immediately after seeing full cold oil pressure (55psi) in the gallery. It can still backfire on a cold take -off in 2nd gear, but I no longer need to take off in granny low. AFRs seem ok, but there is room for improvement. Still lean on acceleration (15-16). I'm hoping I can "tone down" the throttle response as well. The go pedal feels a bit like an on/off switch at take-off and low speeds. I was reading about a TPS "filter" chart the other day, but couldn't really wrap my head around it with my 20mo old running around. Lots to read and tinker with. Overall I am pleased where it is heading and I'm confident that I can make it everything I had hoped it would be.

Right now the next thing on my agenda is to replace the muffler. A baffle is loose inside and the **** thing resonates at idle and from about 900rpm to about 1200rpm. Makes the truck sound like a real heap... Going to pick one up tomorrow.
'55 IH R-122- BG265 w/TBI fuel injection
'64 Porsche 356 C
'68 and '73 BMW 2002s
'86 Cadillac Coupe Deville
'14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)
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Golden Jubilee
Golden Jubilee

Posts: 695

Joined: Thu Nov 29, 2012 6:44 pm

Location: New Salisbury, IN USA

Post Mon Mar 26, 2018 6:00 am

Re: '55 R-122 rehab

When you get the chip thing worked out, you might want to burn a few extras. Some folks might want to follow your lead on going to TBI, but without all the trial-and-error.
My posts contain my own opinions...your mileage may vary, void where prohibited, objects in the mirror may be closer than they appear, and alcohol may intensify any side effects.
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Golden Jubilee
Golden Jubilee

Posts: 672

Joined: Sat Jun 29, 2013 12:58 am

Location: Central IL

Post Mon Mar 26, 2018 7:53 am

Re: '55 R-122 rehab

I'm more than wiling to help others that want to go the same route. I can't say that the chip that works for my truck would be good for others though. Could be a good starting point though. We'll see how mine pans out first.
'55 IH R-122- BG265 w/TBI fuel injection
'64 Porsche 356 C
'68 and '73 BMW 2002s
'86 Cadillac Coupe Deville
'14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)
User avatar

Golden Jubilee
Golden Jubilee

Posts: 672

Joined: Sat Jun 29, 2013 12:58 am

Location: Central IL

Post Mon Sep 03, 2018 9:27 am

Re: '55 R-122 rehab

I’ve been busy with my home contracting company, our two-year-old son, my BMW projects, and most importantly my wife’s detached retina in May. I haven’t had much time to tune the truck but I’ve been using it in writing chips periodically for it. I’m on chip 13 now and have most of the problems worked out. I still need to resolve some cold running issues. Acceleration in Richmond should take care of that. I’ll report back again as I make more progress. All in all the fuel injection is a great upgrade for this truck.
'55 IH R-122- BG265 w/TBI fuel injection
'64 Porsche 356 C
'68 and '73 BMW 2002s
'86 Cadillac Coupe Deville
'14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)
User avatar

Golden Jubilee
Golden Jubilee

Posts: 672

Joined: Sat Jun 29, 2013 12:58 am

Location: Central IL

Post Wed Jun 26, 2019 7:33 am

Re: '55 R-122 rehab

Now on chip version 17 and the cold/warm up performance is much improved. I found a line in the code where the high value was lower than the low value so the computer was constantly at odds with itself. After changing that and adding another 4deg of timing from 400-1000rpm on the map the warm performance and off idle stumble are much improved. Now to undo some of my previous attempts to solve that warm running issue. I also want to find/create a different throttle cable cam for the TB. Very low pedal inputs seems to make for large engine output swings... in short it’s hard to be smooth at low speeds. I think a non-linear pedal may help that a lot.

Anyway, gotta run.
Have fun folks!
'55 IH R-122- BG265 w/TBI fuel injection
'64 Porsche 356 C
'68 and '73 BMW 2002s
'86 Cadillac Coupe Deville
'14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)
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