How should my small 16g run?

[panamarojo]

I just installed a small 16g and I am pretty sure it is installed into a 8cm or 7cm housing. My evo3 o2 housing has been ported to nearly 3" and it matched up perfect to the turbine housing. I still have to verify which housing it is.

I took it for a test drive and noticed it took a while for the turbo to spool but when it spooled it hit very hard. Is this normal? Ill verify what rpms tomorrow when the turbo is actually spooling.

Also what do yall think the last owner tried to do with the 14b turbo if he had it in an 8cm housing? How could I tell what has been changed to the 14b as in turbine wheel and compressor wheel? I heard people are using 18g compressor wheels I think... What could I measure with a mic or take pictures of to find out?

Thanks.

 

[Colip]

That would be a huge turbine housing for a 14b, . I'd say with the compressor housing off you could measure the diameter of the compressor wheel and it would be relatively easy to match your findings to what MHI compressor wheel you have. Have you verified the serial number on the compressor housing to be sure you actually have a small 16g? Every 16g car I've ridden in hits pretty hard, it is a VERY fun turbo for a mild street car.

- Jon

 

[1990AWD]

I thought 8cm housings were for the TD06 wheel and don't fit on the TD05 of the 14b/16g? If there is a 8cm for a TD05, I'm guessing it was being used in 14b drag racing where you just need to get as much exhaust out as possible.

 

[bastarddsm]

there were 8cm td05h housings. They had the dsm style inlet, not the evo3. It's thought they were supposed to be an factory upgrade for the 14b. FP used to have them availible for the Greens and Reds.

 

[panamarojo]

Well how should it run with a small 16g? Spool quick or late? hit hard and spool fast at later rpms?

 

[dsmboost84]

My small 16g with EVO III manifold spooled really fast and hit decently hard. I ran 22 psi with it

 

[panamarojo]

So is it okay to use a small 16g in an 8cm housing?

 

[Bud92gsx]

So is it okay to use a small 16g in an 8cm housing?

You will notice you should be able to take it all the way to redline..Cause the 8cm housing flows alot more than the stock 7cm housing..Both are just fine..

I started to spool around 3k with my small 16g, and hit 16 psi by probably 32-3400 rpms..

So if you count and your around there, you should be good to go.. You will notice an increase in power at 12 psi vs the 12 psi of the old 14b..So yes it should hit harder..

 

[-red97rum-]

So is it okay to use a small 16g in an 8cm housing?

Yes, if the turbine housing is for a TDO5H turbine wheel - 6cm, 7cm and 8cm will all work. Now if that housing is for a TDO6 or TDO6H turbine it's not going to work very well.

 

[DJ23GSX]

You will notice you should be able to take it all the way to redline..Cause the 8cm housing flows alot more than the stock 7cm housing..Both are just fine..

He has a small 16g which comes with the same 6cm turbine housing as the 14b. The evo3 16g is the one that comes with the 7cm housing. The gains wouldn't be that great unless your running a ton of boost. I recently put on a 7cm turbine housing on my 14b and couldn't feel a difference over the much smaller 6cm housing and that with me pushing 20+psi on that lil 14b. An 8cm turbine housing might actually hurt performance on a small 16g. You might also see boost fall off in the upper rpm's with these bigger turbine housings as well due the the larger flapper door blowing open cause the stock actuator can't hold it closed.

 

[panamarojo]

Thanks for all of the info. I just replaced the waste gate with my original because the other was not keeping waste gate shut completly. It was keeping it barely open. So tomorrow ill see if it spools better.

 

[Bud92gsx]

He has a small 16g which comes with the same 6cm turbine housing as the 14b. The evo3 16g is the one that comes with the 7cm housing. The gains wouldn't be that great unless your running a ton of boost. I recently put on a 7cm turbine housing on my 14b and couldn't feel a difference over the much smaller 6cm housing and that with me pushing 20+psi on that lil 14b. An 8cm turbine housing might actually hurt performance on a small 16g. You might also see boost fall off in the upper rpm's with these bigger turbine housings as well due the the larger flapper door blowing open cause the stock actuator can't hold it closed.

I thought my small 16g turbine housing looked just like my 7cm housing..I must measure when I switch turbo's to make sure you are correct..

And If you are, the 7 cm housing is going on the small 16g..That is if I still go 16g..

 

[DJ23GSX]

I thought my small 16g turbine housing looked just like my 7cm housing..I must measure when I switch turbo's to make sure you are correct..

And If you are, the 7 cm housing is going on the small 16g..That is if I still go 16g..

there is no mistaken the two when they are side by side trust me . Heres a pic of my 6cm housing next to my 7cm one. I'm sure you can tell which one is which .

You must be logged in to view this image or video.

 

[99gst_racer]

^^^ It's worth noting that that's not an average/stock 7cm housing. That one is heavily ported.
(It looks to be ported beyond the size of the 7cm gasket in fact.)

You picture also makes it appear that they don't have the same bolt spacing, which they do. Stock to stock, there's not a HUGE difference between 6cm and 7cm housing.

 

[DJ23GSX]

^^^ It's worth noting that that's not an average/stock 7cm housing. That one is heavily ported.
(It looks to be ported beyond the size of the 7cm gasket in fact.)

its actually gasket matched with the fire ring shoulder removed i wouldn't call it hogged out.

here are some better stock to stock pics
http://www.dsmtuners.com/forums/newbie-forum/152954-6cm-vs-7cm-turbine-housing.html

As you can see from the side pic the 7cm housing its physically bigger than the 6cm housing so no matter how much porting you do to the 6cm housing it still won't be as larger as the stock 7cm housing outlet.

 

[99gst_racer]

^^^ Correct. The size difference is more importantly the difference in volute area and radius, and less about the diameter of the inlet as your pictures are alluding to.

 

[Bud92gsx]

There is not a huge difference from the pics..But you can notice a difference..

I'm going to go back in my own pics and see if I can tell the difference betwen the S16g, and the 7cm housing..

Edit took a look at my pics..The 6 cm turbinf housing measures under 2 inches, and the 7cm turbing housing measures a little uner 2.5..

This is for the turbine housing, not the inlet on the turbo, but I'm gonna see if I have measurements of those right now...

Edit2..I only measured the inlet on the 6cm housing, and I did not measure the inlet on the 7cm housing..

 

[DJ23GSX]

^^^ Correct. The size difference is more importantly the difference in volute area and radius, and less about the diameter of the inlet as your pictures are alluding to.

yeah i posted the wrong pic. I had to hand type the picture code on my phone to post it. It wasn't fun . I tried to post my pics of the side of the housings together but it was just easier to post the link instead.

Here is the pic I was trying to post earlier

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Like I stated before I went from the 6cm housing to the 7cm housing on my 14b and I didn't feel any difference. The one problem I did see was that my boost was falling off in the upper rpm's with the 7cm housing due to the larger flapper door blowing open. I didn't have this problem with the 6cm housing. I tried shimming the stock actuator using 4 washers and while it did help the turbo spool up faster it was still loosing boost in the upper rpm's. I ended up custom fitting a 14psi Garrett actuator with an adjustable arm on the 7cm housing and the boost holds much better now.

 

[panamarojo]

I can tell you for a fact it has the td05 serial number and printed on it is an 080. The one that came on the small 16g has an 070.

The turbo is now spooling way faster now. Probably a combination of the wastegate not fully shut or a couple of boost leaks.

 

[skatershawn]

The turbo is now spooling way faster now. Probably a combination of the wastegate not fully shut or a couple of boost leaks.

?? :/

Im confused on how this works, please explain!

 

[99gst_racer]

Poor wording maybe? I hope he means that fixing the wastegate and boost leaks helped spool. Because we all know those two are the leading causes of slow spool and/or no boost.

 

[skatershawn]

Poor wording maybe? I hope he means that fixing the wastegate and boost leaks helped spool. Because we all know those two are the leading causes of slow spool and/or no boost.

Ok, I can see now that you explained that to me, thats my poor reading skills! haha
He most likely fixed one of those two and now it spools faster! And yes I know I just fixed my two pre-turbo exhaust leaks, man did it make my car feel like i had the 1.8L back in it!

But one thing, I was always told that porting out the collector on the turbine housing doesn't really increase spool, in fact it reduces velocity and causes it to spool slightly slower! Is this true? :/