Internal wastegate 20G

[95talontsi]

I was thinking about getting the 20G NOT ported or cliped and wondering if it was possible to use the larger internal wastegate, I don't care for a small amount of boost creep, I always run on 94 gas so the few pounds of boost that creep won't worrie me, what would worry would be like 5-10 plbs of boost. reason why I'm thinking to go bigger then the big 16 g because I heard the bigger turbo was easier on the engine, didn't put as much stress on it to get lower times is that true?

 

[b00sted99-X]

well.. i have heard of people using an internal gate on 20G 's i think its more common than some people realize. not a problem as long as you get a nice big gate.

the reason i decided to reply to you, was to see why you would NOT want to have your turbo ported? porting is the greatest thing for flow you can do to a turbo, and decreases spoolup time.

i can see why you wouldn't want to clip it though.. i hate lag too

 

[Black95GSX]

If you need a 20g setup the way you wanted (ported/clipped/34mm flapper... whatever)... check out www.agpturbo.com

They don't list the 20g on there site, but they would be able to give you a hell of a setup for a good price.

Kevin and Ben are some really kick ass people, and there customer service rox.

 

[95talontsi]

thanks I didn't know porting helped spool up time, what about the idea that a big turbo puts less stress on a engine then a small one to get a lower et.

 

[L2RTSiAWD]

I'm getting an internal gate on my L2R. I don't see why it wouldn't work well on a 20G.

 

[me612]

dont internally gated 20g's usually got 34mm flappers? my friends is set to 15 ad creeps to 18 psi at redline so i guess as long as 18psi don't worry you for street driving on pump gas, then go for it... and that is at redline, so if u don't redline it all the time it should stay close to what u want... also correct me if im wrong, but if u get a 20G that has a 8cm housing, dont those pretty much get rid of the boost creep problem?

 

[NJGSX96]

SlowBoyRacing sells a 20G with a 38mm internal wastegate. I am waiting for mine to show up. Once it does, I'll post a little review.

 

[2gTurboS]

Do you have to have all internals and bigtime supporting mods to run a 20g,even at loww boost levels,13-16 psi? does anyone run a 20g with only the basic fuel,intake,and exhaust supporting mods??

Later..corey d

 

[Kevin Jewer]

I am getting SBRs M50 with an internal gate. I have heard of people running 15 psi to redline. My car tends to creep more than other so we'll see. I used to get 22-24 psi minimum on the 14b, and it took some ridiculous amounts of porting (stock flapper) to get it down to 15. But now even on a small turbo like a 14b I can easily run 18 psi daily, so a larger more efficient turbo will be even happier at 18 psi. So I dont even need to go as low as 15 psi anymore.

The difference between a 16g and a 20g at 15 psi is very small. The only thing you will notice is the increased lag Now at 18-20 psi the gap widens and the 20g clearly flows more air. Put both turbos at 25 psi and the 20g will start dropping elbows on the 16g. But at 15 psi your typical fuelpump and AFC/logger setup will suffice.

 

[95talontsi]

yeah the price different w/ the 20g is about $100 more when you internally wastegate it, so I figure I might as well get it. I'd like to be running like 22 psi at the track and gettting lower et's then w/ a big 16 because it pushs the air easier. Yes I am going to do afc/pocketlogger and fuel mods, injectors/pump. BUt I would think at the track my stock intenals would hold probably put a new head gasket, for a 1/4 mile pass, running race gass and pulling the timing and maybe water injection. My boss has been racing cars for a long time, has a 9.2 second nova so I guess he could give me some hints.

 

[Kevin Jewer]

I have seen stock 1g motors hold 33 pounds of boost... Poeple run 25-28 on 20Gs for years without any trouble. The 7 bolt motors are weaker, but they still seem to do fine at 25 psi. I have heard of poeple folding rods at 27-29 psi, but never lower. I wouldnt even worry about it if you plan on running 22 pounds.

 

[2gTurboS]

No one mentiond where the stock 2g head gasket tends to give at? (as far as power and boost levels)..or is it different on every car?..

 

[Kevin Jewer]

Some seem to have no trouble, others blow once or many times. 7 bolt motors all use "torque to yield" bolts to hld the head down, also known as strechy bolts. But I have seen a certain FWD that put 410 to the wheels without any trouble at all. He bought ARPs anticipating a problem and has yet to install them ) But I have also seen cars that are only midly modded that cant seem to keep a gasket in there.

 

[mike9146]

Just as a datapoint, a local NWDSM'er could not get his 20G to work correctly with the internal at hight boost. I believe it was blowing open at pressures ~5psi less than what he had his BC set to. He went external and has since told us that the car feels totally different. But YMMV.

Mike C.