Does anyone know exactly what sensors/meters/wires must be changed to convert from LH 2.2 to LH 2.4? The harnesses look the same. The computers look the same. I know the AMM is different. Would a conversion work just swapping AMMs and ECUs?

Thanks,

Philip Bradley

I wonder if it is makes any more financial sense to 'upgrade' to an LH 2.4 ECU and ignition module than to find a third party EMS. If memory serves me correctly, you will need both components and a new wiring harness as the LH 2.4 ECU has a different pin out.

For the dollars and sweat equity involved in staying with a Volvo EMS, Haltech or similar will give much more bang for the buck. And, after all, I have the sneaking suspicion that where you want your car to be will not be supported properly by any Volvo EMS.

I realize you know all this, but perhaps it is time to just bite the bullet...

Ed O'Briant

P.S. Ken Carillo had problems running lean at 11 psi with just the Unitek cam and LH 2.4. If you go for the entire head sowewhere down the road, I don't see you getting anywhere near the proper amount of fuel with a Volvo EMS.

Trade up to a 90.

I'm with Abe on this one. My LH 2.2 runs just fine for me. Perhaps you want to be able to replace the chip for your turbo project, you know, 30psi boost.

The idea is to bypass the 6000 rpm limiter as simply as possible. So far, no one has been able to tell me how to bypass the rpm limiter on an LH 2.2. The LH 2.4 ECUs have an rpm limiter that is at least several hundred rpm higher. A higher rpm limiter would be more useful with a higher lift cam and my performance valve body. Further, performance chips with revised fuel maps are available for the LH 2.4, but not for the LH 2.2. If I could get a chip for the LH 2.2, that would be another solution. So far, no one has been able to tell me where to find a chip for the LH 2.2.

The rpm limiter aside, I have no complaints about the LH 2.2.

Philip Bradley

2.4 has 35 pin ecu connector, 2.2 has 25 pins. Too many differences to enumerate.

Poorest bang for the buck you'll ever spend.

The goal was not to get a bang for the buck. I want to find the cheapest way to bypass the rpm limiter on the LH 2.2. No one knows how. The LH 2.4 has a higher limit that would work for me. Plus the LH 2.4 can be chipped, whereas no one has chipped the LH 2.2. I can get an ECU and an AMM cheap, but might not be able to rewire the entire car or turn up numerous other sensors cheaply.

At this point, I have gotten about all the cheap bangs for the buck that are possible. What is left will be increasingly more expensive. But I am not satisfied with stock or near stock or sort of near stock.

Philip Bradley

I agree completely. I have all the components to do the job with, and lots of electrical experience. It is not worth the effort especially considering the poor reliability of the early LH 2.4 ECU.

How about changing from NA 2.2 to Turbo 2.2? That's what I'm interested in! (B23ET Project).

Rene

This is another good question. Is the Turbo ECU different? Does anyone know? What do the Volvo books specify as to part numbers? I know they run different injectors and that those injectors have different impedences, but that is dealt with by the resistor pack. The AMM is the same.

Philip Bradley

I know that the Turbo ECU is different. I think the ignition computer might be the same but it is still necessary to switch all the wiring because of the differences between the turbo and NA cars: Battery location and AMM location. I spoke with a mechanic who said he did it once by switching all the wiring starting at the large multiplugs under the dash on the left and right side. Volvo was smart here because the chasis wiring and the engine wiring are separated. I already have the Turbo wiring harness from an 88 740. I just hope it works out. I plan on converting in the summer when the engine is ready. (I should look for a second car in case: 244?) Most people seem to tell me to buy a turbo car, but I think this is doable.

Rene

The ECU for the turbo and NA LH 2.4 are different. According to abe, the injectors for the turbo cars will interchange for LH 2.2 and LH 2.4.

I posted a question to the Turbobricks msgboard a while back but didn't get any useful responses. Anyway, I too am curious about the NA/Turbo LH2.2 differences. Phillip, you say that the AMM's are the same - I've got the 007 AMM. Is that the one you are referring to? The question then remains as to whether it's as simple as adding the hi-flow lo-impedance injectors with the resistor pack, or if the Turbo ECU is truly different enough to warrant changing that too. Did the Turbo 2.2 have a different FPR? How about the fuel pump?

I am also curious about bypassing the rev limiter. Surely there must be a way without changing to LH 2.4. Even then you've still got one. My 2.2 limiter kicks in at about 5700-5800 RPM.

vytas

I am pretty sure the fuel pumps are the same. The AMMs are both -007s. Note that there is no boost input to the ECU. I suspect very strongly that they are identical and interchangeable. The injector resistor pack for the low impedence higher flowing 300 cc/min injectors is needed.

If the non turbo 213 cc/min high impedence injectors work fine with the same AMM and ECU, then, why do the turbo 300 cc/min low impedence injectors work fine? Usually, raising flow rate by 30% will result in very poor running unless there is remapping -- that margin is outside of the 02 sensor ability to compensate. So maybe I am wrong about interchangeable ECUs. I have access to a few and might try a swap sometime.

The LH 2.4 ECU appears to have a rpm limiter that is more like 6500 rpm. Few if any LH 2.2 ECUs allow more than 6000 rpm.

Another area of possible change is the ignition ECU. But I would not be surprised it that was the same also.

Philip Bradley

The "007" AMMs are identical between B230F and B230FT versions of LH 2.2, but the LH 2.4 uses "016". You're right about more mods being available for the 2.4 system, but the rev limiter is based on engine part fatigue, not cams and induction. I guess the "K" or later engine design can take the extra speed (if the factory limit was higher on the 2.4)...is your bottom end ready to take it?

My bottom end can take it. I have a 94 B230FT motor. The top end has been redone.

Philip Bradley