ok so hopefully this will be my last turbo post. but ive been researching like crazy and i cant seem to get some answers. and the ones that i have gotten i would love to get some opinions.

first off. im running the zpi manifold which uses the mitsubishi flange and...well its been a huge hassle. well i as you all know by my other posts ive been on the search for a new turbo. well ive been trying to be a little bit different and just stick with the dsm flange rather than getting a t3.

so right now i have a 20g turbo. but i have honestly no clue what size the turbine wheel is and i dont know how to measure it. but i measured it across the downpipe flange and it was around 6.2cm, but the turbine is still huge compared to my 16g which has a 7cm and my 14b which had a 6cm. the pictures are compared to the 14b seeing as the 16g is still on my car lol. well not that you guys can tell from the pictures. but if you would have to guess, what size do you think it could be?

ok well heres where the problem comes in. i have a 4 bolt down pipe and a mitsu flange. and the turbo i want to run(the 20g) has a 3 bolt down pipe flange and a twin scroll. well the 16g exhaust side will fit on the 20g if it is possible to port the 7cm 16g into whatever size turbine wheel that is. so is it possible to port the exhaust side? i think its only around a 3mm difference but im not 100%

so that leaves me with a few options that might and might not be feasable. so my main questions i guess would be. should i just get a t3 flange welded on and a new downpipe? but my only concern about the 20g turbine side is, is that im not sure if its going to be too large? i mean im looking for a decent amount of tq still. i dont want to only have the last 1500rpm's on my powerband..lol, or is the twin scroll that efficient?

or should i try the port job on the 16g turbine housing seeing as that will probably be the cheapest and the most efficient turbo set up (in my opinion, although i very well could be wrong lol). and is the porting even possible?

and the last option would be to just take the compressor wheel/cover off and rebuild my 16g with it on there?

im really sorry about the rediculous post. its late and i started to babble on a lot..well just throw out any opinions you have. im just trying to make a different set up that from what i know of. no one has. lol thanks guys!

 

anyone?...

 

Call Greddy USA about the 20g turbine size
You need to contact a machine shop about porting the turbine side. I'm famaliar with people porting the comp side for better velocity and spool but hot side not so much.

As for the other issues I say just rebuild the 16g and run with it for now and later deal with building/changing the wheels and housing that is unless you have second car to drive and can the TC down while you fix the turbo to your taste.

GReddy Performance Products
9 Vanderbilt, Irvine CA 92618
T: 949.588.8300 F: 949.588.6318

 

If your in Orlando I can give you numbers and locations of some decent machine shops to talk to. Good luck man

 

yeah im familiar with porting the comp side too, i was just curious weather it is possible to port the turbine side. it seems possible but im guessing its probably not very practical.

and yep. as of now i think im just going to go online and get arebuild and a 20g compressor wheel and housing and throw that on my 16g then just get that balanced and have a td05 20g =)

but yes i am located in orlando, sorry for the incrediblyyyy late reply. ive been soo busy with school

 

I had the 20G compressor, but my turbine side was the same as the 16G. Actually I think it actually was a 16/20G that I have running a while back.

 

oh sweet. well how did that do for you? ive always been curous if anyone had run it before, i just didnt know how word the question lol.

so what was the power, spool and would you consider it a worthwhile turbo?

 

Not bad. Better top end, spool was pretty much the same. Not sure on the power, but I was running it on 12lbs. I enjoyed it. Ideal for a street setup.

 

ok sweet. ive had my concerns with it. i wasnt really too sure how it would handle or if its even worth it. but im figuring i can have it done for around 200 bucks. and thats much cheaper than a new turbo.

how much better do you think it is than the evo iii 16g?
also would it be worth port and polishing the 20g comp housing before the install?

 

are u a stock motor the 20g vs a 16 in my history with each is that the 20g will make a little more power once u start going to 12 psi other than that 16g felt the same to me

 

you know better...one more time and I will be forced to ban you.

 

yeah im a stock motor. i mean im not looking for rediculous power. im hoping for around 300/300 at around 10psi. so your saying the 20g wont make more power untill after 12psi? or only untill 12?..

and tugatito, thanks for the offer lol. but im already running a custom set up. im just trying to fine tune it now. what kit do you have for sale? lol

 

the big16g can get over 300

 

Turbonetics kit wit a 57 trim garrett turbo,wit a different bov
( turbo xs rfl ) Wich is really loud , 440cc. Injectors and aem fic wit pnp harness for 07 -08 tcs

 

well i know that the big 16g can get over 300. im just looking for the least amount of boost possible. i just feel that the lower compression with less boost would be safer and a little easier on the motor. i mean correct me if im wrong. its just what i feel is better. and its not much extra cash so i feel that it could be worth it in the long run.

 

IF your aiming for 300 hp you will have to atleast hit 10lbs too even come close to your goal.

What year motor are you running and how many miles do you have on the clock?
Do a compression test to make sure she is healthy atleasat for low psi 7-9 lbs.

If she reads correctly then move on to setting up and finalizing your kit and how much lbs you will run.

 

Just to ease your mind I was running a high mileage boosted motor that ran fine till I raised the boost and spiked but if I never changed the spring I would be driving it right now at 106,... so you can run high mileage just make sure you don't overboost and have a proper tune.

Also make sure your BOV isn't surging or fluttering and that your wastegate opens at the correct boost level.

 

I have a customer with 160k miles on his car and hes at 14 psi no issues, been boosted for over 50k miles!

 

damn, lol well 160k is a lot haha.

ok well im at i think 77k right now. and ive been boosted for id say at least 15k. and ive only been running 6psi the whole time. but the tune hasnt really been too great.

but i do need to do a compression test. ill try and do that soon and let you know what its at.

and yeah i know i would have to run about 10psi. i was looking to run 9 or 10. but as for the 300whp. im not looking for a solid 300. im just trying to at least get in the general area. i would be happy over 280 lol

but either way. would the 20g be a better option at this point? in any way? i mean i want to do it just because. but if theres no reason at all i wouldnt want to waste my money.

 

1boost this is never a waste of money to satisfy your passion or desire for what you want. It's your call on what turbo you finally decide to run. We can only offer our humble opinions and advice. The 16g can do what you desire and the 20g can do more than you desire to keep it simple. Also for any tuning questions don't be afraid to ask friendly neighborhood tuner ELEVATION TC.

He can shed more light on your predicament of which turbo to run. Hopefully you can bring your car down soon so we can have a gander. Lol.