Comparison between 70HPQ and billet BB 71

[karolko]

i was hoping that people who have used both turbos could chime in, and describe the differences that they experienced and what type of combe they had.

Better spoolup/less Lag? Same converter? What stall? Heads? Cam? etc.

Is it worth the money?

Thanks alot

Adrian

 

[WhiteTtype989]

Subd.

 

[2QUICK2B6]

how much are the 2 turbos now

 

[GNBRETT]

5 hp at 25 psi. hardly worth it. ull have to turn the wick up to see its true benifit

 

[bison]

About 2whp on a engine that put down 800whp. Likely running 35+psi of boost. With your heads and cam neither would be a good choice imo.

 

[karolko]

Bison are you speaking to me? Also do you have real life experience comparing these two turbos. I am currently running a 70 hpq and i am happy with it, but i am curious HOW much better this new billet 71 really is?

 

[JOHNDEEREGN]

Bison are you speaking to me? Also do you have real life experience comparing these two turbos. I am currently running a 70 hpq and i am happy with it, but i am curious HOW much better this new billet 71 really is?

Brian (bison) is one of the more experienced people on this board as far as builds/tunes/combos.

I would take his advice to heart,

Ty

 

[bison]

Bison are you speaking to me? Also do you have real life experience comparing these two turbos. I am currently running a 70 hpq and i am happy with it, but i am curious HOW much better this new billet 71 really is?

Im speaking to anyone reading. That was a real dyno test comparing the two on a hard running TSM combo. Not some pie in the sky wet dream numbers that are often posted in the forums.

 

[karolko]

Cool. Real life info. So you are saying that with only changing the two turbos, the only gain was 2hp at 35psi?

What about the overall low end and spool? Was it noticably better? I think this is where the potential difference is going to be other that the overall HP output.

What was this TSM combo packing for a combo?

 

[WhiteTtype989]

2QUICK2B6 how much are the 2 turbos now

71 billet dbb is about 2200$ , 70 hpq isnt avail . anymore the billet 71 superceded it .

T-netics version of the 70 hpq the 70 strim is about 1400 ish .

 

[bison]

Cool. Real life info. So you are saying that with only changing the two turbos, the only gain was 2hp at 35psi?

What about the overall low end and spool? Was it noticably better? I think this is where the potential difference is going to be other that the overall HP output.

What was this TSM combo packing for a combo?

I dont know the exact boost pressure but it was the same boost on the comparison though. TSM cars run a 3 bolt ex housing typically a Precision .85 and leave off a 2 step with a trans brake and never have a problem spooling any of the turbos they run. None of these cars are required to have low end power. They all come up quick and run low 1.30 60 foots. I dont have the exact details of the combo. The limitation on those is more the ex flow than anything else.

 

[karolko]

The reason i am asking these questions is i am directing this post more towards people who want to run such a large turbo on the street (probably biggest "streetable" turbo IMO). That is why i am asking about low end and spooling.

 

[2QUICK2B6]

first hand the 70gtq dbb doesnt spool very fast with a small 212/212 on the street.

 

[karolko]

what would be the best cam for the job?

 

[Blazer406]

I think for you to see the difference you will have to run near 30 psi.... and over. IMHO, at that point.... the 71 billet is distancing itself from the 70HPQ quite handily.

With all that said.... neither are a good mid 20's boost street turbo IMHO.

 

[bison]

The reason i am asking these questions is i am directing this post more towards people who want to run such a large turbo on the street (probably biggest "streetable" turbo IMO). That is why i am asking about low end and spooling.

All the cars ive been in that ran GTQ/HPQ ex wheels were considerably more lazy than anything with a 65 or 76 trim ex wheel. Imo to have a really good spoolup you would need a converter that is looser down low or N2O unless you want to have a slightly lazy spooling setup. A converter that will spool one really well on the tree is not necessarily going to be good on the street off the foot brake from a stop or a low roll. The N2O will make a huge difference.

 

[GNVYUS 1]

Hey Bison, was that a 109 motor with aftermarket heads or a Stage 2 with Stage Heads?

I don't see the point in running these monster turbos in the 3 bolt, you're never going to come close to seeing these turbos potential.

 

[bison]

Hey Bison, was that a 109 motor with aftermarket heads or a Stage 2 with Stage Heads?

I don't see the point in running these monster turbos in the 3 bolt, you're never going to come close to seeing these turbos potential.

It was a GN1 headed stock block engine with stock intake and solid cam. I agree. This engine would have made at least 60whp more with a tang 4 bolt even with the same wheels and likely 100whp more with a GTS ex wheel but neither are a go in TSM.

 

[S2V6RACER]

The 70 HPQ turbo is capable of running 9.0000000's at 151+ at #3550. We are going to be putting on a 71 HPQ turbo the same one that has been in the 8's and see how much faster we can go this spring.

The 70 HPQ we run that turbo on the street all the time. It is a street driven TSM car and it spools lightning quick. You have to have a combo that will utilize the turbo to it's max before you can make statements on how much better one is than the other because if we use Sully's dyno examples down at TB.Com this year he really didn't tell us anything worthwhile because he was not maxing out his current turbo. His 9.38 is still slower than the 70 GTQ's were going 5 years ago... It's all in the combo. I will say that if the car is being street driven you will not be able to even consider utilizing the power a 70 HPQ will make and even a 70 GTQ. We can only run 20 psi on the street without issues hooking up and that is on slicks.