Spool times between...

[turbocamino1]

Same engine ,same converter. 650HP. Spool times between Precision JB gen2 6766 .63 vs. HPT DBB F2 6870 (i believe they are .70A/R) Both 3 bolts. I know the gen2 lights up pretty quick.

 

[turbocamino1]

Need to omit the "650HP"

 

[TType85]

I don't have the 6870 but my HPT 6466 lights up as fast if not faster than my 6262 did and was WAY quicker to spool than the generic 6766 I had.

 

[dynoman]

Don't forget to check out Comp turbos. My 6771 smoked my T 'netics 6465 bb and now they have a new hubless turbo that flows 15% more with the same size wheel. I have one being built right now and should have it in 8 weeks. Here is a pic of the log from when I hit it at a 30mph roll boost went to 32# in less than .5 sec & made 920 hp. The tall blue line is boost and red is TPS . I let off cause the car started going sideways. Lol
Mr spool can help with specing one out .

 

[dynoman]

My 6771 smoked my T 'netics 6465 bb

The T'netics 6465 is .63 ar & the comp 6771 is .85 ar both 3 bolt .

 

[Mr.Spool]

This^^^^^^
Real data
Not it spooled faster it think
But initial boost and max boost in time with the power achieved.
Dynomans car made 990hp in under .5 sec and for those that understand holley look at the tps

 

[V6sleeper]

Don't forget to check out Comp turbos. My 6771 smoked my T 'netics 6465 bb and now they have a new hubless turbo that flows 15% more with the same size wheel. I have one being built right now and should have it in 8 weeks. Here is a pic of the log from when I hit it at a 30mph roll boost went to 32# in less than .5 sec & made 920 hp. The tall blue line is boost and red is TPS . I let off cause the car started going sideways. Lol
Mr spool can help with specing one out .

Cant wait to see the Hubless log..

 

[turbocamino1]

Thanks for all the above. To be more transparent,, I want to try a bb turbo. 3 bolt stuff. Wanting something that my 235" 109 can spool but also be enough for the 269" 4.1 i am slowly getting parts for. Planing on keeping the 4.1 around the 700WHP range , give or take. I do have a dead new gen2 jb 6766 .63 Bison made for me a couple years ago that may fit the scenario but not bb. The instant spool time of a bb turbo sounds great and would help me with some of the blower cars i face every summer. But at 3400Lbs, car has traction issues as it is. Yes, i am adding weight to the back of the car to help. It has Vikings and several othr rear arms and braces as well,,also a new HR bar going in. On concrete with a heated tire,works pretty ok. I like everything about the HPT and look to give my business to Harry. The HPT6870 i mentioned sounds perfect for the 4.1 but a tad too much for the 109 maybe? ,, so his 6466 may be the ticket for this go between plan but see a backpressure concern on a 269"?

 

[Mr.Spool]

Sent you a pm

 

[TType85]

Seems to be a good time if you are looking for a new turbo with the all the new wheels out there. It would be interesting to see how the new Turbosmart turbos are too although those don't come in the Buick 3-bolt.

 

[Mr.Spool]

Seems to be a good time if you are looking for a new turbo with the all the new wheels out there. It would be interesting to see how the new Turbosmart turbos are too although those don't come in the Buick 3-bolt.

They are hpt from what I understand
Compressor maps are available on the website

 

[TType85]

They are hpt from what I understand
Compressor maps are available on the website

interesting. Good for Harry then

 

[jasjamz]

Thanks for all the above. To be more transparent,, I want to try a bb turbo. 3 bolt stuff. Wanting something that my 235" 109 can spool but also be enough for the 269" 4.1 i am slowly getting parts for. Planing on keeping the 4.1 around the 700WHP range , give or take. I do have a dead new gen2 jb 6766 .63 Bison made for me a couple years ago that may fit the scenario but not bb. The instant spool time of a bb turbo sounds great and would help me with some of the blower cars i face every summer. But at 3400Lbs, car has traction issues as it is. Yes, i am adding weight to the back of the car to help. It has Vikings and several othr rear arms and braces as well,,also a new HR bar going in. On concrete with a heated tire,works pretty ok. I like everything about the HPT and look to give my business to Harry. The HPT6870 i mentioned sounds perfect for the 4.1 but a tad too much for the 109 maybe? ,, so his 6466 may be the ticket for this go between plan but see a backpressure concern on a 269"?

Are you planning to use a production 4.1 block?

 

[turbocamino1]

Are you planning to use a production 4.1 block?

Its a 291 production block,,something Weber build around 2010 ,,girdled ,4.0 bore ,crank ,rods. Its all together and could be installed as it is,but, decided on a better piston than the old Hyper's.

 

[Phoneguy]

I just removed a Precision 6870 and bought the new Next Gen 7270. I had no problem spooling the 6870 on the street with my 109 stroker, and have only got to make 1 small 2 second hit with the new 7270. I see no difference in spool time with the 1 hit but I think it may be a little faster when I get the fuel adjusted for it. Unfortunately I live in St Louis and the weather is not cooperating ...

Bryan