Hayes

Can anyone point me out to the major differences in the engine construction of the two? I know the that Turbo has a lower compression ratio and forged internals, but are there any other differences? I have thought about piecing together some parts to turbo my 85, so I have more power through the hills, and I am trying to gather as much information as I can. Also, for the people who have 22RTE's, how does the Turbo affect the offroad capabilities? Do you boost when you are going fairly slowly, or just at the higher speeds?

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AxleIke

You boost at high RPM's, so, it doesn't matter what speed you are at.

It doesn't affect it at all. Just more power if you rev it up.

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Hayes

but do the rpms get high enough to cause boost when climbing rocks, or only when hill climbing and stuff?

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JamesD

The pistons in the turbo engine are cast just like the N/A engines except they are lower compression.

James

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abecedarian

cylinder head chambers are different (but heads can be interchanged)
pistons are dished on the 22rte (to lower compression)
oil passages in the block are slightly different, but they are not incompatible and there's a casting in the exhaust side of the block for the turbo oil return.

in general, the 22rte is below the 22re in power when revved less than around 2000 rpms, and provides around 50% more power than the 22re above 3000 rpms through redline.

as is the case with most turbos, the 22rte is, by design and such, not going to offer any more power from idle to low/mid RPM's than the 22re can, and at lower rpms may offer less power due to the lower compression ratio.
on the other hand, the 22rte design is quite capable of accomodating a supercharger which will compensate for the low-rpm doldrums (aka "turbo lag").
so now you have another option to consider.

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Hayes

I have always considered a supercharger. I think I can piece together a turbo system for less. I only plan on about 6 pounds of boost, and since the 22re makes more power off the bat (against the 22rte without the turbo on), Lower boost can help me make more power on hills and the like. Basically, I am just thinking out loud.


Also, has anyone seen a centrifugal supercharger used on these engines?

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abecedarian

I feel you'll be in the realm of 'diminishing gains' if you try to turbo a 22re without significantly changing things, with regards to a 22rte in comparison.
In particular the fuel management. Rumor has it that the 22re can deal with approximately 3-5 psi boost without mods, however that also will require adjusting the timing (retarding it) to prevent significant detonation (since the 22re ECU is not programmed to deal with boost/timing requirements), which will put you almost on par with a 22rte with regards to 'off-idle' performance, and consequently will not provide the same peak power a 22rte would.

keep in mind the 22rte ECU is programmed with the turbo in mind, and the 22re ECU is not. So given the higher compression ratio in the 22re and having to retard the timing to prevent detonation, you end up in a "net-zero-gain" situation, where either one performs approximately as well as the other in most situations.

just a thought....

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Hayes

I was thinking about tuning it with the MegaSquirt, which would allow for timing adjustments. I see what you are saying. A supercharger would be sweet, but with a high price tag.

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Obama is an acronym.

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