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anyone running the 67bb or the 70gtqbb

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turbogreg

New Member
Joined
Jun 8, 2005
Messages
182
hey, looking to upgrade my gt6152e to a gt6776bb next month. am debating about going with the 70gtq ball bearing as well. just wanted to know if anyone is running either turbo with ported irons and stock bottom end. i'll be keeping the boost down for a while because i wont be building the motor til next winter or until it goes boom. how is the streetability of both? i'm thinking the 67mm will be a better choice for me seeing how i just want to be able to go 10.50s and drive back and forth to the track and to school.(both an hour away) is the 70gtq as tractionless as i think it will be? anyone out their had both and can tell me exactly how they felt?


Thanks,

Greg
 
I use the 70GTQ ball bearing but i have a built bottom end. I used to run a 70 p-trim ball bearing on stock bottom end. I ran 11.00's with that setup. Very streetable setup. What stall are you running? The 70 GTQ will need 3400-4000 stall. I think you would be happier with the 67 on your stock bottom end. You can utilize less stall, faster spool, and it will still be a great turbo to have with a built bottom end. The GTQ is more than you need right now IMO. If you are planning on building the motor with forged stuff here soon.....then the 70 GTQ may still be an option. The Q-trim will cost you some time on the street without a 3500+ stall. You will find yourself gettin a little behind and then having to make up ground. Noticeable lag....especially from a roll.
 
67

hey, looking to upgrade my gt6152e to a gt6776bb next month. am debating about going with the 70gtq ball bearing as well. just wanted to know if anyone is running either turbo with ported irons and stock bottom end. i'll be keeping the boost down for a while because i wont be building the motor til next winter or until it goes boom. how is the streetability of both? i'm thinking the 67mm will be a better choice for me seeing how i just want to be able to go 10.50s and drive back and forth to the track and to school.(both an hour away) is the 70gtq as tractionless as i think it will be? anyone out their had both and can tell me exactly how they felt?


Thanks,

Greg
I run a 67bb and absolutely love it. spools faster and has way more mid and top end than my old TE61. My stock bottom end went kaboom before I had a full 1/4 mi pass on it. I drive the car 80miles a day in the summer. I feel it had a mid 10 in her. I will say this, mustangs, cobras, ss camaros all hate this car!!! I,d go 67 again in a minute!
 
3500 + seems like alot of stall for a full BB 70 GTQ :confused:

You can run a regular 70 GTQ with this much convertor.
 
jUST GOT DONE WITH A REBUILT RUNNING THE 67MM FLAT TAPPET 218 COMP CAM STOCK PORTED HEADS 70 MM THROTTLE BODY AND PRECISION FRONT MOUNT. fRESH OFF THE DYNE AND NO STREET DRIVING AS OF YET WITH 20LBS OF BOOST AND COSERVATIVE TIMING CAR LAID DOWN 502 RWHP
i SAY THE 67 TURBO IS THE WAY TO GO SPOOLS VERY FAST AND CREATES A NICE EVEN POWER BAND ACCROSS THE BOARD. aS A MATTER OF FACT THE CAR HAD AN OLDER 64MM PRECISION TURBO THAT MADE LESS H.P. WITH MORE BOOST!!!! gOOD LUCK ON YOUR DECISION.
 
Just curious YellaGN, but who did you get your 70GTQ ball bearing turbo from?
Got any pics you could share?
Inquiring minds want to know. :D

Patrick
 
Turbo's

Hey Patrick any info on the 70 series dbl bb turbo's Like the 72, 74, 76. Like recommended stall ect. ect. would be appreciated.

Steve
 
thanks for the info guys. my buddies dad is a turbonetics dealer at his shop and is going to give me a NICE deal on any turbonetics turbo i'd like. i think i'm going to go with the t70bb p trim turbo. i plan on building the motor up next winter and don't mind running low boost until then. since i planned on doing the heads cam at the end of this month i think i'm going to just wait a few more weeks and do the heads/cam/and turbo at the same time. will post the #'s when i get everything together.


Greg
 
Just curious YellaGN, but who did you get your 70GTQ ball bearing turbo from?
Got any pics you could share?
Inquiring minds want to know. :D

Patrick

I am pretty sure he got it from Boost Performance. The owner is a Precision dealer here in Amarillo. I don't know of any pics that he has posted, but I have seen that turbo in person, and it's huge (especially compared to my stock one :eek: )
 
At this point, it's super uber hard to guess cause no one has ever posted results with a true dual ball bearing, Precision made 3-bolt .85 A/R PT70, 72, 74, or 76 GT-Q turbo on a Buick. But....

If I had to guess, based on past results of going from non ball bearing to true dual ball bearing on the other turbos, there is about 400-500 rpm minimum, less stall speed required when going from non bb to dual bb.
Example:
If you run a 3500 stall converter on a non bb PT6776 on a 231 CI v6 now, you really only need a 3000-3200 to spool a dual ball bearing PT6776R. As time goes on, we might find people running an orange stripe 12" converter that can only foot brake to 2800, will spool the PT6776R just fine. But until someone does some real world testing, the general consensus right now is 3000-3200.

With that said, typically the non bb PT70 GT-Q likes a 3800-4000 stall converter on a 231-235 ci motor to be able to race it. (IE: Pro Tree and Trans Brake heads up racing) These new stroker motor combos will require slightly less, I'd say about 100-200 less. 270+ ci Stage motors are another story. Now, if we apply the 400-500 rpm rule, this would theoretically put the stall requirements for this new dual BB 70 GT-Q turbo at around 3400-3500 and still spool it up enough to race. The big WOW factor with this info is, it will allow you to run a tighter converter with less slippage, which equates to more mph. Not to mention that you can get a nice 9.5" lock up that can handle some serious power at the 3400-3500 rpm range. A real win win for everyone. So instead of running say 10.00's at 132-133 on moderate boost, you might see cars running 10.00s at 136-138 on the same moderate boost level. :D

Time will tell once more people get them on their cars and hit the track. But I have a feeling that this is what we will see. The other thing is, the larger you go with the compressor wheel, the more the stall requirements go up. This is due in part to more rotating mass for the larger compressor wheel. Exactly how much more, is also a grey area. On a 235ci motor with a 76 GT-Q, we would typically need a 4200 stall. On a Stage II 270+, a true 4000 would get the job done easily with the 76 GT-Q non bb. On my old car with a 274ci Stage II and a PT74 GT-Q, my Art Carr 19930 that stalled to 4000 would spool that turbo up so fast, that I had to really be careful on how much boost I left with or it would just smokem like a top fueler. I really could have lowered the stall to around 3800 and it still would have been raceable. Hope some of this helps, and I hope my predictions come true. If they do, it will make a lot of racers very happy I can assure you.

FWIW, there have been some Buick racers that have run the GT4276 in both non ball bearing and ball bearing who have reported favorable spool up results. But that turbo has only ever been available with a T4 inlet 4 1/4" discharge style Garrett turbine housing in 1.01, 1.15, 1.28 and 1.44 A/R. TSL guys love the GT4276 non bb with the 1.28 A/R Garrett housing.
HTH

Patrick

P.S. It would be sweet if the powers that be could develope a 3-bolt .95 to .96 A/R housing that would take a internally gated 3.5" downpipe and bolt up in the stock location. They could call it a PT4294R. (70mm comp wheel) Or how about a PT4202R (74mm comp wheel) And lastly would be the PT4276R (76mm comp wheel) But there I go again speculating.
 
Actually i ordered my GTQ from Cottons Performance. George @ Boost Performance does do all my work though! As far as the stall goes.....I run a 3200 stall right now with the 70BB GTQ and its laggy. On the tbrake i can still build boost, but on the street from a roll i find myself getting behind about a car and then having to reel them in and pass them! :D Now I use a small shot of nitrous to get it pumpin! I am going to step up to 3500 real soon. For a BB 70 GTQ i would recommend a 3500-3600 stall.
 
Actually i ordered my GTQ from Cottons Performance. George @ Boost Performance does do all my work though! As far as the stall goes.....I run a 3200 stall right now with the 70BB GTQ and its laggy. On the tbrake i can still build boost, but on the street from a roll i find myself getting behind about a car and then having to reel them in and pass them! :D Now I use a small shot of nitrous to get it pumpin! I am going to step up to 3500 real soon. For a BB 70 GTQ i would recommend a 3500-3600 stall.

You wanna sell me that old stall when it comes out Clay? :D
 
vortech you just made my decision thanks. i'm now for sure going with the gt6776bb. my car's 99% street driven with a lil track use so i don't want too much lag at all. i have a 3200 10.5'' converter in my car now and don't want to touch the trans anymore. the 6776 should be enough for my 10.50 goal and be a blast on the street. plus with the money i save i can get a nice set of m/t's to handle my new found power. :biggrin:


Greg
 
just ordered the gt6776E dual ball bearing tonight from hartline. hopefully should be pretty fun with the ported irons and roller cam. :biggrin:
 
I just purchased a motor from someone on the board and it has the following
Here's what I have.

Fully Built 109 with .020 over JE pistons, Pro-gram steel mains 2 center's, stock crank 10/20, stock rods all done, ARP main studs, SPS rod bolts, motor was balanced and is within a few grams on each cyl.

Dale Cherry ported and polished Irons, Bigger valves, Viton seals int and exhaust, de-shrouded around the valves. 100lb comp cams springs, Receiver grooved for 1007 felpro's These heads have not been flowed but were on a 10.0 car before I got them.

Hand ported intake manifold matched to the heads.

Modified front cover with a stock meling oil pump, setup for external oil cooler.

Comp cams 212/212 non-roller cam, degreed in.

F.A.S.T 60lb injectors.

Turbo is a TE-61

Fully built 200r4 built by Otto in CT. Stage Right Transbrake, all the good internals, stock pan, alto red clutches, alto wideband, th200 servo, ect ect. Just gone through and replaced all the seals and cluches. No more than 5k on this. Also has a Vigalante 0 pump 3200 stall single disc too.

I am getting rid of the FAST injectors and buying some 60 siemens
I was thinking of adding Alky injection and maybe changing the turbo


What do you guys think. I would like a streetable 10.70-11.0 car with slicks

Any help appreciated.
 
I just got my BB 70GTQ in the mail. I ordered it from Hartline performance :cool:

Its going on the TTA:eek: with a 3500 PTS 9x11
 
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