Difference in factory turbos

[Donniejr81]

Can someone tell me the differece in the stock turbos used on the 84/85HA and 86/87IC TR's other than the mounting? Such as cfm, boost? Would I notice any better performance putting my 87 turbo on my 84HA engine after clocking it? My 84turbo is toast, but I have a fresh 87turbo looking for a new home.

 

[RUQWKNF]

The '86-'87 TBO-348 turbo could typically support around 465 flywheel hp if pushed to it's limits. The turbine housing would bolt up to your existing header/up pipe, however, the compressor cover that is used on the '84-'85 Hot Air cars' turbo is very different than the one used on the TBO-348. The HA version is an o-ringed, slide in discharge out of the compressor cover into the upper plenum, where as the TBO-348 has a clamp on hose style discharge. They are not compatible without some serious modifications being made.
I don't think Garrett ever published official CFM flow ratings of each year model turbo. But, due to the size and design of the HA turbo, I wouldn't try to push it much past 350 flywheel hp.

Here is the link to the '84/'85 stock turbo.
Turbocharger Guide

Some pics,

Here is the link to the '86/'87 stock turbo.
Turbocharger Guide

Some pics,

Stock turbo on the right in this picture.

The other difference, obviously is the clocking configuration between the two are totally different. An '86-'87 could be clocked in the same manner as the '84-'85, but would require modification to work with the stock hot air intake manifold. Boost levels for '84-'85 were 7-10psi ambient temps depending, and '86-'87 levels were 12-15psi ambient temps depending.
Hope this helps.


Patrick

 

[Donniejr81]

Thanks that the kind of info I was looking for. I was looking at both of them today, and even if I clocked the 87 turbo to match the 84's my TB would be sitting about 90* turned....hmmmm. What to do?? This is a slight predicament, and I'm up against a brick wall for the moment. Make me a turbo to intake adapter hose/coupling possibly so I can keep the TB sitting straight and just have the turbo slightly out of clocking??