Ecu Tuned For Specific Turbo Size?

[jdlc]

My 94 855 Turbo/AT happened to have 16T, a little upgrade from stock 15G, not much bigger from what I understand. It's worth mentioning that I run on stock 94 ecu (EGR and all) and able to boost 12psi with MBC.

I'm looking at used ST chipped ecu, 17psi and tuned for 95R with 15G - will this be a drop-in for my 94 Turbo with 16T?

Also, would it matter if the ecu was from manual car and not auto?

Thanks

[Che'_Moderator]

My 94 855 Turbo/AT happened to have 16T, a little upgrade from stock 15G, not much bigger from what I understand. It's worth mentioning that I run on stock 94 ecu (EGR and all) and able to boost 12psi with MBC.

I'm looking at used ST chipped ecu, 17psi and tuned for 95R with 15G - will this be a drop-in for my 94 Turbo with 16T?

Also, would it matter if the ecu was from manual car and not auto?

Thanks

Those turbos are so close its not going to matter. If you were racing and really needed that last 5hp maybe but for a driver the turbos are basically identical.

[jdlc]

Those turbos are so close its not going to matter. If you were racing and really needed that last 5hp maybe but for a driver the turbos are basically identical.

Words.

Ideally, it would be cool if the ecu is from AT car, but if it happens to be from manual, would that be an issue?

Thanks a lot.

- OrleeC

[Pops Racer]

This interests me also. I am putting in 16T also and looking for tuning options. Thanks for bringing it up.

[thelostartof]

15g and 16t are damn near identical

[Pops Racer]

15g and 16t are damn near identical

My case: 165k miles on a 15G conical vs. 35k miles on 16T angled? Must be some advantage, besides being newer. I'm trying to find differences in pinned posts but nothing definitive. Now this is just my interpretation, but 16T comes on a little sooner and stays a little later? It's good to know ECU can run car with noe probs, makes it a little easier to own a used tune.

[JHEIII874T5M]

In the case of 15G vs. 16T, I wouldn't be concerned with the differences in a/f and ignition advance tuning between turbine housings. However, you may find that your BCS has trouble controlling the angled housing. More like a hurdle you'd overcome if/when you come to it.

[thelostartof]

My case: 165k miles on a 15G conical vs. 35k miles on 16T angled? Must be some advantage, besides being newer. I'm trying to find differences in pinned posts but nothing definitive. Now this is just my interpretation, but 16T comes on a little sooner and stays a little later? It's good to know ECU can run car with noe probs, makes it a little easier to own a used tune.

turbine wise the angled outlet is better than anything that came on the 15g, but then again both turbos @ one point and time had the straight outlet right? both of those turbos are the same turbo if you ask me

the 16t is slightly better in the mid range efficiency wise. top end wise the 15g is better suited if you plan on pushing them to the end of the maps

either way anyone paying for a retune when going from a 15g to a 16t is just about as smart as someone paying extra for a 16t because it is a bigger turbo

the G series wheel is a very very good in my book.

[jdlc]

In the case of 15G vs. 16T, I wouldn't be concerned with the differences in a/f and ignition advance tuning between turbine housings. However, you may find that your BCS has trouble controlling the angled housing. More like a hurdle you'd overcome if/when you come to it.

Then I suppose if BCS is not used at all and MBC is employed, then all is good?

BTW, I got an answer that the 17psi 95R ST chipped/tuned ecu for 15G is from AT. Am I all set with my current set-up then and can just drop-in the ecu? (My set-up being 94 Turbo thus w/ egr like the 95, AT like the vehicle the ecu was installed, 16T turbo). The chip is socketed but I inquired and ST wants 200 fro re-flash/re-mapping, even after I insinuated that like what's being said in this thread, the 15G and 16T are identical size-wise. I have not even asked about the different 'configuration' (angled/conical/staright) but it looks like it's a non-issue other than BCS consideration, which I don't use.

[Pops Racer]

turbine wise the angled outlet is better than anything that came on the 15g, but then again both turbos @ one point and time had the straight outlet right? both of those turbos are the same turbo if you ask me

the 16t is slightly better in the mid range efficiency wise. top end wise the 15g is better suited if you plan on pushing them to the end of the maps

either way anyone paying for a retune when going from a 15g to a 16t is just about as smart as someone paying extra for a 16t because it is a bigger turbo

the G series wheel is a very very good in my book.

Well, my 15G is going so I picked up this 16T angled for pretty cheap. Have yet to tune anything, but thinking about it. Going crazy on the tune is not in the plans. A used 1995 ECU with a 15psi IPD tune would probably suit me fine.

[JHEIII874T5M]

Then I suppose if BCS is not used at all and MBC is employed, then all is good?

BTW, I got an answer that the 17psi 95R ST chipped/tuned ecu for 15G is from AT. Am I all set with my current set-up then and can just drop-in the ecu? (My set-up being 94 Turbo thus w/ egr like the 95, AT like the vehicle the ecu was installed, 16T turbo). The chip is socketed but I inquired and ST wants 200 fro re-flash/re-mapping, even after I insinuated that like what's being said in this thread, the 15G and 16T are identical size-wise. I have not even asked about the different 'configuration' (angled/conical/staright) but it looks like it's a non-issue other than BCS consideration, which I don't use.

17 PSI ST chip will be fine with a 16T. Boost spikes should be controlled if you use a MBC instead of a BCS.

[thelostartof]

Well, my 15G is going so I picked up this 16T angled for pretty cheap. Have yet to tune anything, but thinking about it. Going crazy on the tune is not in the plans. A used 1995 ECU with a 15psi IPD tune would probably suit me fine.

the angled outlet will help huge

otherwise a fresh turbo is always nice

want to sell me the conical housing off the 15g?

[Pops Racer]

the angled outlet will help huge

otherwise a fresh turbo is always nice

want to sell me the conical housing off the 15g?

I was/am saving for a DP so I can install 16T. See my latest post in Member Announcements...15G will have to do for a lil bit. I'll post it for sale when I do swap.

[randomdude]

so a 15g actually runs better to redline, when tuned correctly, aye lostart? 16t is just better in the mids?

[jdlc]

17 PSI ST chip will be fine with a 16T. Boost spikes should be controlled if you use a MBC instead of a BCS.

Thanks Joseph.

When I think about it, it has been said here that 96-97 tuned/chipped turbo ecu will work on 94-95, deleting egr. Now, from pinned thread, I think 96-97 has 16T, so that implies 16T-tuned ecu will work on 15G fine. Mine of course is the opposite, I will try to use a 15G-tuned ecu from 95 to my car with 16T. So, in addition to yours and Mike's input, I'm comfortable with the purchase.

If everything works out, can I hope to see 240whp on this baby at 17psi? That was my stated goal from the get-go when I purchased this car (240whp at 18psi actually). Maybe dyno would be in order when all this is done.