Performance of a Turbonetics BB-70 Q

[Russ Merritt]

I dynoed my street car last Sunday with a regular BB T-70Q .82, Champ aluminum heads, 214/210 roller, 85 delphi's, ME-R chip (21 degrees of timing) through ATR's single 3" exhaust, with the air filter hooked up and pulled 559 rwhp and 627 tq. 25-27#s boost. I only took 4 pulls and did almost no tuning at all. Found out it's running rich with the wide band 02. First pull was 547 hp, went up 1 click on the chip just to see and it fell to 530hp. Took it back 2 positions from the first pull and gained 12 hp and got the 559.


Who knows how much more I could get with some dyno time... Bet I coulda got more with this combo and maybe even higher with 24 degrees timing.

Can't wait for the Super T-70 Q I got comin for the race car....

 

[chevyII]

So you heard from jack? I was interested in the super T also.

 

[chevyII]

Quess I should ask about your converter and spool for a BB version. How is it on the street?

 

[NEARING]

Originally posted by Russ Merritt
I dynoed my street car last Sunday with a regular BB T-70Q .82, Champ aluminum heads, 214/210 roller, 85 delphi's, ME-R chip (21 degrees of timing) through ATR's single 3" exhaust, with the air filter hooked up and pulled 559 rwhp and 627 tq. 25-27#s boost. I only took 4 pulls and did almost no tuning at all. Found out it's running rich with the wide band 02. First pull was 547 hp, went up 1 click on the chip just to see and it fell to 530hp. Took it back 2 positions from the first pull and gained 12 hp and got the 559.


Who knows how much more I could get with some dyno time... Bet I coulda got more with this combo and maybe even higher with 24 degrees timing.

Can't wait for the Super T-70 Q I got comin for the race car....

I would that is good for only 21 deg timing.

 

[c&cgn]

How is the Super T-70 different from the current T-70 ? What makes it "super" ?

 

[JCotton]

The new Super T's come with a larger compressor housing than the standard Turbonetics T4's. Very impressive looking turbo, I have a few out there now, the Q trim seems to spool about the same as the T4. I just put a P trim Super T on a street car and spool up is excellent, power seems just as impressive. The only downside are some of the mods we do to get the room needed for the large comp housing. Everything hooked up fine with the pipe to IC, the stock oil return line only required a minor tweaking. The inlet bell has a ASME inlet bell, increases air velosity and volumne into the compressor inlet.

I'd post a few pics, can't figure out how......

 

[Nick Micale]

Jack, how about some comparison numbers if you have them yet?

Is the wheel larger or just the housing?

Would there be enough added performance to convince me to upgrade my BB-70 P trim? [Which is kick-ass on the tree! ]

 

[Otto J]

I was told by 2 top turbo guys today, THat changing my small .70 compressor housing to anything larger would net me nothing as my motor being 249CI cannot support the airflow.
I was told the turbo i have is actually a bit to large for the motor also
They said a big housing is not a must
One thing i can say is I have a GT76Q Limit TUrbo with a tiny .70 compressor housing with a .96 ex housing and it spools freaking quick

 

[JCotton]

Nick, same wheel, just a larger housing. We are still track testing, haven't got any definitive results at this point. I wouldn't suggest updating your existing turbo, unless you want to look keeeeewl.........

Otto,
If I am reading your statement correctly, your 2 TOP turbo guys are saying it will increase your air flow, but your 249" motor can't handle it? Just a thought........ how is it John Galina's 200 something inch motor can run 7.9--...... I don't know the weight of his car, no doubt lite. Surely he's pushing lots of air through it.

 

[NEARING]

Originally posted by JCotton

Otto,
If I am reading your statement correctly, your 2 TOP turbo guys are saying it will increase your air flow, but your 249" motor can't handle it? Just a thought........ how is it John Galina's 200 something inch motor can run 7.9--...... I don't know the weight of his car, no doubt lite. Surely he's pushing lots of air through it.

I was sort of about that myself.

But I'm easily .....

 

[Otto J]

I am not sure either,But i was told you can only push so much air into a motor that size. This is what i was told.I was trying to buy a larger compressor housing to see if it would give me anything,And I was told not to waste my money.
I still may try it though.

 

[NEARING]

Originally posted by KLHAMMETT
I am not sure either,But i was told you can only push so much air into a motor that size. This is what i was told.I was trying to buy a larger compressor housing to see if it would give me anything,And I was told not to waste my money.
I still may try it though.

I'm sure that is true once you reach a certain point but there a cars with a good bit smaller ci than us with big turbos.

Were those turbo pros V8 guys?

 

[Otto J]

I beliene what they say, to a point, I do have a small motor, If it was a stage 2 headed car with small cubic inch it would probably handle more volume and a larger turbo.
If you look at cars Like John Gallina's, His motor being that it turns in the 8000 rpm range also demands more air, i spin mine to about 6500.

 

[Nick Micale]

Originally posted by JCotton
................ how is it John Galina's 200 something inch motor can run 7.9--...... I don't know the weight of his car, no doubt lite. Surely he's pushing lots of air through it.

Over the scale at 3100#'s, 209 cu.in. and 9000 RPM!

[twin 61mm turbos.]

 

[JCotton]

Thanks Nick, I knew it was in that area wasn't sure of the exact numbers, so I figure I wouldn't make believe....... I knew...

Otto,

I beliene what they say, to a point, I do have a small motor, If it was a stage 2 headed car with small cubic inch it would probably handle more volume and a larger turbo.

Exactly my point, small cubic inch is not the only determining factor, getting air in and out of the motor, by what ever means it takes, determines HP............. head flow, cam duration and lift, RPM, etc.......

 

[John Wilde]

Otto

You can use a bigger turbo on your 249 motor than that.
There are several 3 liter guys with 88-91MM Turbos.
Also you should consider setting the motor to run more
than 6500RPM. I am not sure why buick guys are so scared of RPM? I know of people going 7500RPM easy on stage 1 type heads. With a 272ci Stage 2 Head Duttweiler gave us a 8400rpm shift point.

 

[Otto J]

John I am not afraid, Ocasionally i pull it to 7000, But i still only have a 226 hydraulic roller in it, Its time to go solid, But i hace other thing that come first, plus i want to maximize my current combo beforei make any drastic changes.
I am saving the car for The Nats, I have yet to make a pass with an a/f any leaner than 10.0 to 1. So i have some room for tuning,but want to bring another turbo to expieriment with.

 

[John Wilde]

I wish I still had my 88, I would let you throw it on.

 

[Otto J]

Originally posted by John Wilde
I wish I still had my 88, I would let you throw it on.

I am tossing around the idea as i have one available to me, Just not sure how well it will spool

 

[mec108]

Doe's the "super T" compressor housing interchange with the T series backplate or do you have to purchase a different backplate to accept the super T larger compressor housing? And is there any performance gains going to a super T housing on a T-66 Q trim B.B turbo? THANKS