Big16G clipped.. Pros & Cons?

[B00stedgst]

Opinions?

 

[Wilsonman02]

It has pro's and con's to it. Just depends what you want.

 

[darthfoul]

I just installed a big16g onto my 97 GST about 4 days ago, its not fully tuned, but i think taht i have a good idea of what it can do.

Pros:
really good low to mid range power. Even clipped 15 degrees, its still spools really fast, and that considering that i have the big greddy FMIC.
Huge difference between the T25 and big16g. 16g has a lot of potential.

Pretty east to install, i ran into a few problems, but i was ill equipped.

ITs a good first turbo, if you dont know how "big" and fast you want to be going. good starting point. It feels like i have a totally different car when it comes to the power increase.

Cons:
Seems to fall off at around 5800 rpm at WOT. not as much of a constant pull as i expected.
Im not getting as much out of it as i initially expected. i thought that it was going to give me more power out of the box.
You would probably need all the support mods to be happy with it.

good luck.

 

[Turbo Monk3y]

i totally agree i just have a few things done and my 16g out of the box seems better on top end but its missing the torquey 2nd gear plus im almost positive now that ive done this rather than most of the supporting mods that you definatly need the other mods to bring the potential of the 16g out .. as of right now it just seems like my car has more turbo lag and slower 2nd gear but im getting all the supporting mods so im hoping to tune this into a nice low 13 second maybe high 12 sec car when im finished in a month or 2.

 

[GSTspeedracer]

PROS: Dynoed 316+++ on 20 psi pump gas and SSMIC

CON: the most ineffiecent turbo made




My friend has a 16g and when we race ( all the time ), we're side by side 1, 2 and into 3rd. By the end of 3rd and into 4th he's DONE....

 

[B00stedgst]

I have..
Greddy FMIC
s-AFC
Greddy BOV
Intake
Ported 7cm exhaust manifold
550's
BR FPR
1g Fuel Rail
BR Fuel Pump
BR uicp
Ported o2 housing
2.5" back
NGK plugs/wire
New head
ACT III clutch
Fidanza flywheel
Solid mounts
All the guages

The turbo is a Big16G clipped and ported. The the final thing i need to put on, so what should i expect? BTW 75% of this stuff i put on this winter without even driving my car.

 

[Blk_99gst]

Originally posted by darthfoul
I just installed a big16g onto my 97 GST about 4 days ago, its not fully tuned, but i think taht i have a good idea of what it can do.

Pros:
really good low to mid range power. Even clipped 15 degrees, its still spools really fast, and that considering that i have the big greddy FMIC.
Huge difference between the T25 and big16g. 16g has a lot of potential.

Pretty east to install, i ran into a few problems, but i was ill equipped.

ITs a good first turbo, if you dont know how "big" and fast you want to be going. good starting point. It feels like i have a totally different car when it comes to the power increase.

Cons:
Seems to fall off at around 5800 rpm at WOT. not as much of a constant pull as i expected.
Im not getting as much out of it as i initially expected. i thought that it was going to give me more power out of the box.
You would probably need all the support mods to be happy with it.

good luck.

Something must be wrong with your car or your butt dyno!!!, but you've got it backwards. Clipping takes away from spool up (ie slower to spool up), gives you less low end, but clipping is suppose to give you a LOT more top end. You say you have great low end and spool and not so great top end. That's totally backwards.

Maybe data log your car and timing could be getting pulled in the upper rpm's for some reason.

 

[B00stedgst]

It will still pull at low harder then the t25 no?

 

[Blk_99gst]

Originally posted by B00stedgst
It will still pull at low harder then the t25 no?

Not really. The t25 spools up and hit boost well before 3000 rpm, so you get some nice power inthe 2800-5000 rpm range. But the t25 dies above 5000rpm.

A big16g will spool before 3500 rpm; so you don't get the low rpm power (2800-3500) that the t25 would give you, but from 3500 all the way to 7000 redline the big16g will pull like a raped ape!

 

[darthfoul]

Dude, you know that it will not pull HARD all the way to red line. ported and/ or clipped like it does in the mid range no matter waht you say, or what your "butt dyno" tells you.

The reason it will pull harder at low to midrange is because, even if the big16g is ported and clipped, its still is a small turbo, it will spool fast it will produce power. It is not a crazy big turbo imho. Everybody has there opinions.

Its a huge difference from the T25 maxed out though!!!!!!!!!

 

[B00stedgst]

awesome, sounds like i should be in for a treat with all these mods i did over winter

 

[Awdboost]

Originally posted by darthfoul
Cons:
Seems to fall off at around 5800 rpm at WOT. not as much of a constant pull as i expected.
Im not getting as much out of it as i initially expected. i thought that it was going to give me more power out of the box.
You would probably need all the support mods to be happy with it.

That your internal waste gate that will drop boost. What has happen is that there is too much pressure and internal will pop open. letting you boost drop.

 

[Awdboost]

darthfoul, If you are indead running a external WG and a clipped 15 degree turbo, your car should pull like mad top end. Clipping allows the turbo to be less restrictive and alow for more power top end and a little less low end. Hence the slow spool. I've hear that a 10 Degree clip could give you anywhere between 15-25 HP. on a Big 16G. If your boost is dropping of it could be a number of thing alowing that. We can first start with your boost controller. What kind are you running? Also your bov could be leaking or not tight and how much boost are you tring to push. This turbo should be good for 25 psi.

 

[darthfoul]

I am running a Road Race Engineering Manual boost controller. That may be my problem now that you mention it. I never really thought of that being the problem. I do in fact have a profec B waiting to go in. All my supprot mods are pretty strong so that may be the weak link.

 

[B00stedgst]

okay back again, my car is almost back together except im not sure about the two vaccum lines coming from the profec B, i plugged the right vaccuum line (if your standing in front of the car) into the the wastegate on the turbo but it hits a T junction before that, i didnt intall the boost controller so im wondering if this shitty shop just hacked my vaccuum lines.... also i heard my boost controler will be off due to the new turbo

Thanks in advance for the help, i did all this work myself and am very anxious to get it started!

 

[Awdboost]

Sorry. I can't get a visual on what your talking about but the best way to set up your boost controller is to follow the direction that greddy gave you. Or just click here

 

[B00stedgst]

that pdf file gave me probs, and i dont have the original instructions. Also tom. i will be starting my car, is there anything i should know before i start it up for the first time in 5 months with all those mods?

 

[Ryan95tsiAWD]

Originally posted by B00stedgst
that pdf file gave me probs, and i dont have the original instructions. Also tom. i will be starting my car, is there anything i should know before i start it up for the first time in 5 months with all those mods?

Have fun!! ....just don't blow your engine like I did

 

[B00stedgst]

how?

 

[Ryan95tsiAWD]

170K miles for starters ...then misc. cooling issues

BAM... spun bearing

 

[Phoenix_RsX]

from what I've seen in the 3 months I've had my b16G yes ported and clipped to 15 degrees.

Pros: Great starting point for a turbo, spools quickly, pretty decent on the top end, easily upgradable to a TD06 20G(I'm going to slowboy for the conversion in June), can hold a decent amount of psi(18) for something relatively cheap.

Cons: The only con I've experienced to this point is that it is relatively small......You are only going to get max 350 hp out of it and that is with all the supporting mods and some serious tuning.....and if you are anything like me(which is most boost happy guys here) 18 psi just isn't enough.

But it's mainly in what your main goal is......if you want mid 13s, then it's a great choice.....you lookin for 12s, especially with FWD The B16G 99.5% of the time just isn't enough. but, that is just speaking on what I've dealt with in my car.

 

[B00stedgst]

ok first attempt to start today..
car idles rough and pops every so often. also i have a vaccuum line with a T connector right near my steering column, one tupe is the plastic tubing for the boost guage and the other im not sure yet, the hose that comes off to there im not sure where it should be going, someone told me one of the vacs could be my old boost guage. also i was told to set the fuel preasure around 38, is that 38 lb's static? I need a new crank pulley and just had the timing done by my friend but i was told that could be the problem too. also towards the end the car was rough starting cause we had to charge the battery the turbo timer screeen has two groups of lines that look like F's almost but they dont mean anything im pretty sure. but i can pull my key out and intstead of shutting it down by hitting the off button manually i can no longer do that cause it seems dead. so my lights would stay on.

any ideas guys?

 

[B00stedgst]

also my EGT gauge never budged but i only really had the car roughly idling for about 15 seconds, should it have moved in that amount of time?

 

[Ryan95tsiAWD]

do you still have a stock fpr, fuel solenoid and throttle body?

check the line coming off the end of the fuel rail (right side)
follow that and you should see the nipple for another line...this is where one of the ends of that "T" (which is where your boost gauge is hooked to im assuming) shoud go. the other end should go to your intake mani on the front/top/right side.
...hope that makes sense

 

[B00stedgst]

not sure what you mean, i got all my belts on and double checked timing thats right.

the problem with the car is it idles funny and is rough starting or wont idle. could be the vaccuum line still, i t'd the line i was talking about into the top one thats going into my intake and for a boost source i plugged the line into the 3rd smallest nipple in my greddy bov, i didnt have anything on that before but im really stumbed on this whole vaccuum situation and it may be the problem that is not making my car run..

help!