What would you do? Small 16g or 14b

[idkiliketurbos]

I installed a small 16g on my 97 gst and I am having boost creep issues. I had a 14b on it and ran 13 psi with some spiking up to about 18 psi. Mods are in profile besides the turbo now being the small 16g. Last night I took the car to the track and could hardly even go half throttle and above 5k rpms without the boost getting to a very high level. The 14b does have some decent cracks in the hotside, especially around the wastegate flapper. Would you keep the small 16g and try to port it to help with creep or put on the 14b again and sell the 16g to use money elsewhere?

 

[pj91gsx]

pick up and external dump or port the o2 housing. cutting the divider in the o2 housing would fix it completely. external dump can still be harder to control depending on turbo size. If it was a 20g it would still creep.

 

[JusMX141]

^ If it were a 7cm 14B it would creep too.

The reason you're not seeing the creep with your complete 14B installed is the 6cm turbine housing is adding more exhaust backpressure than the 7cm housing on the 16G. Like Austin said above it has nothing to do with what compressor your turbo has and everything to do with the turbine housing size, wastegate design / hole size, and the fact that you most likely have a very unrestricted exhaust.


Porting will help, a larger wastegate hole / flapper will help, an o2 dump will help, adding exhaust restriction will help...or you can just spend some money on supporting mods that will let you run whatever boost level the turbo is creeping to.

 

[idkiliketurbos]

Isn't the small 16g hotside a 6cm hotside too?

 

[JusMX141]

Shouldn't be. All 16G's have 7cm turbine housings from the factory.

 

[idkiliketurbos]

So with my current mod list (besides turbo on the car being the small 16g), do you think I should stick witht the 16g or put on my 14b, sell the 16g, and have the money to put towards getting dsmlink v3 lite?

 

[volcomsnow245]

14b FTW and dsmlink port out everything for the 14b.

 

[4Lurker4]

Keep the s16g, I love mine and grab ecuflash/evoscan (cheaper)

 

[RipperXX]

I'd keep the small 16g and just resolve the boost creep issues. It's not like the small 16g is got a real noticeable increase in lag or anything, just keep it, resolve your issues and you will be more happy since the 16g can easily outperform the 14b. Now wither you can or choose to take advantage of that is all on you.

 

[idkiliketurbos]

The only think holding me back from keeping the 14b is my funds at the moment. I don't have the money to get tuning right now. And with no tuning and my only fuel upgrade being the evo 9 fuel pump, I have to keep the small 16g running under 15 psi for sure.

 

[RipperXX]

So unbolt the 16g and o2 housing and get to porting? a new manifold to turbo and turbo to o2 housing isn't going to cost that much. Im sure you know someone with a rotary tool.

 

[sbeck]

You should have done fuel before turbo. Used Evo Injectors and dsmlink lite are not that expensive and then you could have not had this problem and maxed out the turbo.

 

[RipperXX]

Should have doesn't help him much right now. Although I agree, get some 550's and a AFC and you will be fine and it shouldn't cost much. 550's go fairly cheap from the Evo guys, and a used or old AFC shouldn't cost that much either. AFC is a crapy way to tune compared to Link yes, but it will be all you need for a small 16g and 550's.

Until then, I recommend you get to porting.

 

[idkiliketurbos]

Well I can always sell the 16g and be that much closer to link and some injectors. I really don't want to buy an SAFC since I am planning on link anyways.

 

[RipperXX]

I'd still keep the 16g and just do some porting. Why? Cause well if you sell it now, your just going to end up spending money upgrading the turbo shortly after you get the injectors and Link anyway. And either way you want the ability to run less boost right?

But I see what your saying, with the injectors and Link you could at least push the 14b... eh your call either way. port and keep, or sell and buy but you asked what we would do, thats what I would do. Although it sounds like you already have your mind made up now to sell it and likely already did before you started this thread, you just wanted someone to agree that you were making the right call to give you that warm fuzzy feeling. Either way is not a "bad" or wrong call. So just go with which ever you want to do.