How much boost on Boss gts turbo?

[Cale]

im running 22 psi on my boss gts 61 with dual ceraimc ball bearings now with maft pro (speed density) and im wondering how much this turbo would hold up to? and also the fact that i cant change the timing how much i could boost without blowing it up? timing is set to 7 degrees at 800 rpm. i have wbo2 and egt for security and at 22 psi it looks fine.. but im about to dyno her tomorrow and maybe bring the boost up a bit more..
everything is done to the engine with wiseco pistons eagle rods and arp allover, 2mm hks stopper gasket and 650cc injectors and much much more

[suprahero]

8000rpm? 7degrees? I think mine is set at like 14degrees at 8000rpm. I don't know what is consedered safe though. Do you have a way to monitor it for knock?

[Cale]

not 8000 rpm.. 800 rpm.. ive lowered it for safety.
but back to the question =)

[spoolint78]

To my understanding you can wire up the maft pro to monitor/alter your car's enging timing.

[frontierguy25]

It depends, I have 660 injectors and a 60-1 Boss turbo. First if your turbo has that stupid oil filter on the feed side get rid of it, over time you will be rebuilding that thing!! I know! I have run 17 psi on a small HKS IC and made 411rwhp. As long as your fuel is right you should have no problem boosting 25+ psi. You have the Ball Bearing option so your turbo should be fine for that much boost! I plan on running about 22psi on mine next time I go to the dyno and see what it does.

[Cale]

i made 408 rwhp today with 641 nm torque (473 ft lbs) at 20 psi...
pretty nice numbers i think but i would like more of course =)

as for the turbo oiling is it the oil restrictor you are talking about ???

[starscream5000]

No, there's filter in the turbo itself IIRC, you need that restrictor. Don't take that off!

[Cale]

ok so its abolutely nessesary to remove that filter??

[frontierguy25]

No, there's filter in the turbo itself IIRC, you need that restrictor. Don't take that off!

There is no restricter in the turbo, it is a piece that goes in between the feed line and the turbo, it just basically extends the feed line. but if you take that off the feed line with bolt right into the top of the center bearing cartridge.

That stupid re stricter cost me 2 rebuilds. Talk to Jeff Tamilus He makes the JT series turbos don't use the restricter or filter. If that thing gets clogged or hurt your turbo is gone!! Then you'll need another rebuild! I have been running my turbo without it for about 7k+ miles now and it's been great no issues at all! I couldn't even get to 3k miles with that stupid restricter. The local turbo shop tested it and it wouldn't let 35psi even go through it, it just clogged up.

So I say take it off! Talk to JT though!

http://notrice.com/shop/catalog/index.php?osCsid=c4edd0b44373a603bf46c573bba921a4f

[starscream5000]

You will need a restrictor on the oil feed line for a Ball bearing turbo. You do not need the filter though, although it's recommended to have one, but it's up to YOU to keep a close eye on it and the condition it's in. The turbo needs clean oil running through it, thus the need for another filter.

Why do you think the filter clogs up, hm?

If you do not have the restrictor, it will choke up the CHRA.

[Toy-Rific]

You will need a restrictor on the oil feed line for a Ball bearing turbo. You do not need the filter though, although it's recommended to have one, but it's up to YOU to keep a close eye on it and the condition it's in. The turbo needs clean oil running through it, thus the need for another filter.

Why do you think the filter clogs up, hm?

If you do not have the restrictor, it will choke up the CHRA.

This is Greg from Lipp, I like your reply above! The BB turbo needs very little oil to run. The non BB turbo needs all the oil you can give it. All turbo's for the MA70 must have free flow of the oil, However much oil you put in it,the same amount, or more is better, must be able to flow through or you will have oil leaking out of places you don't like.
The 60-1 is a very good wheel and it is not a high pressure wheel so around 25 lbs of boost is going to be the max you should be looking for.

[starscream5000]

Thanks Greg, just clearing out the misinformation ;)

Got that cast of a new upgrade for the 7M exhaust manifold done yet?

[Cale]

good to hear from the manufacturer =) by the way whats the differnce between the 60-1 and the gt61??? and the difference between the gts and garret except in/out size of compressor house?

[starscream5000]

Different trims on the wheel. If you look up some garret wheel specs, they should give you a good idea of the differences.

The compressor housing on the GTS is indeed larger, claiming to offer some additional power available if you are extracting everything that turbo has to offer.

[Cale]

ok reason i ask is that i first ordered a boss gts 60 but it had gone out so i took the 61 wheel option with bb... and thats all i know abou the turbo.. that the inducer is 61mm. dont know how much power it can handle but im sure much more than the 408 rwhp i made on 20 psi..?

[frontierguy25]

The 60-1 wheel is actually a 58mm wheel. So yours should flow more than mine!

I guess I just read over where your turbo is ball bearing, mine is not so there is no need for the restricter. Make sure that you check it from time to time because it tends to get damaged or where the holes in the filter deal are no longer there. It's like a little screen, and if you seen a screen on a window where it has been hit and the screen flattens. and the holes get smaller.

[starscream5000]

Per Greg's website, the Stage 4 GTS61 is rated for 600HP with supporting mods, and the stage 5 GTS61 is rated for 615 with supporting mods. The differences between stages is the size of the turbine on the exhaust side. IIRC the Stage 5 either has a .81 trim or .84 trim, can't remember exactly, and I don't know at all what the stage 4 has.

[Toy-Rific]

We run the stage 5 gts cover with the gt61 wheel and it has the ball bearings in it. With the bb it is spooling 900 rpm sooner than with the thrust bearings. This turbo is on Charles 88 with only fuel up grade and the stock injector's and Maf pro. He is very very happy with this turbo. The 61 trim is a Garrett wheel that is used but I don't know the Garrett p/n
Greg

[Cale]

ok, good info from you guys!! i will check that filter tomorrow.
ok, faster spoolup, i have tried to change my maft pro to get faster spoolup but i get full boost at about 4200 rpm... i thought it would be much faster with the bb??
by the way heres my dyno results:

[starscream5000]

Which stage do you have?

[Cale]

im almost sure its the stage 5 GTS gt61 bb i have.. ordered from suprasport, have tried to ask them for exact specs but havnt got an answer... if thats what u meant?

[starscream5000]

Okay, I dug out the email from greg back from 1/4/07, The stage 5 has a hot side A/R of .81, and like Greg already said, the compressor wheel is a genuine Garrett wheel, so all you have to do is go to their website and look up the physical specs of that wheel.

Gregg may be able to tell you what type of housings are on the turbo and what classification they are.

[Toy-Rific]

im almost sure its the stage 5 GTS gt61 bb i have.. ordered from suprasport, have tried to ask them for exact specs but havnt got an answer... if thats what u meant?

You have a stage 4 exhaust wheel and the gts 60 compressior wheel. You should be at full spool around 4200/4700. You did not buy the ball bearing turbo so your spool is going to be higher.
Do you have your car running so you can drive it or still tunning it? How do you like the turbo??
Greg
Lipp

[starscream5000]

Greg, what's the specs on the stage 4's hot side?

[Toy-Rific]

Greg, what's the specs on the stage 4's hot side?

They are the same housing on all of them. I do have a new housing that is a .53 AR that will be a stage 3 for replacement of the stock CT-26. It will have thrust and Ball Bearing center. The castings are being made now and I will have the first ones ready in about 8 weeks.
Greg
Lipp

[starscream5000]

I understand that, but do you know the size of the turbine wheel on the stage 4's?

[Cale]

You have a stage 4 exhaust wheel and the gts 60 compressior wheel. You should be at full spool around 4200/4700. You did not buy the ball bearing turbo so your spool is going to be higher.
Do you have your car running so you can drive it or still tunning it? How do you like the turbo??
Greg
Lipp

no, that was the first order i made but then we changed it to ball bearing and 61... but maybe its still just stage 4?

[Cale]

recieved a spec list of my turbo from Jack at ss:

20 psi is pretty much where the turbo is "waking up". That turbo will handle 35psi
Here are the specs on your turbo
Stage 5
Dual Ball Bearing
GTS cover
61 trim
AR on LIPP housing .81

[Toy-Rific]

recieved a spec list of my turbo from Jack at ss:

20 psi is pretty much where the turbo is "waking up". That turbo will handle 35psi
Here are the specs on your turbo
Stage 5
Dual Ball Bearing
GTS cover
61 trim
AR on LIPP housing .81

Like Jack said" I am getting old" I was wrong and you did up grade to the above turbo...
Greg
Lipp

[IJ.]

Like Jack said" I am getting old" I was wrong and you did up grade to the above turbo...
Greg
Lipp

Not the Lone Ranger there Greg :D

[Cale]

its ok greg, i just got worried there :icon_bigg

[Toy-Rific]

I understand that, but do you know the size of the turbine wheel on the stage 4's?


If i am not wrong, the inducer is 2.559 dia and the exducer is 2.336 dia.
on the stage 4 or also know as the O trim/stage
Greg
Lipp

[starscream5000]

If i am not wrong, the inducer is 2.559 dia and the exducer is 2.336 dia.
on the stage 4 or also know as the O trim/stage
Greg
Lipp

Awesome! Thanks!

[Cale]

tried to boost her up a little today but its strange it wont rise.. i have the maft-pro boost control set to 25 psi but it will only boost to 20 psi and reaches that first at 4500 rpms... and i 1st and 2nd gear the boost only goes up to 15 psi... have checked for leaks but there aint no leaks =( when the turbo was new (it still is) then without bc the wg where at 15 psi but no when trying it only boost about 10 psi...
if someone are familiar with the t-pros bc then maybe could give me some tips

[starscream5000]

Ask Dr. Jonez in the SME section, he'll see if he can help you out.

[Toy-Rific]

You may need to shorten the rod on the end of the actuator. By turning it so the length is shorter will give you more boost. Try that, give it 1 full turn to see what you get.
Greg
Lipp

[Cale]

ok will try to adjust it a little when the car has cooled down hehe