72bb vs. PT70gtq dyno test!

[Louie L.]

Originally posted by Louie L.
about 18% in my car.

I have since had the converter restalled and from the limited runs i got at BG it looks very promising.

I meant 16% not 18



Bill,
Thanks for sharing the info you have gathered. I hope you continue to keep us filled in on what works and doesnt. There are plenty of folks who have similar findings as yours. From what ive been told Limit can build this same turbo using the same wheels sans the ported housing. Now there should be no issue wether it is a PTE or Limit.

 

[TURBO 6]

I talked to somone at Limit about upgrading my 70 to a GTQ and they said it wouldn't be worth it unless the turbo needed to be rebuilt. Dosen't look like that from what Bill posted.

 

[Kansas T]

I agree with these other guys. 516hp seems really low for a 72 at 30psi. My T66bb made 525hp at 24psi on my mild combo. I think its great that your comparing the 2 like that, but something seems alittle off.

 

[John Wilde]

Originally posted by Kansas T
I agree with these other guys. 516hp seems really low for a 72 at 30psi. My T66bb made 525hp at 24psi on my mild combo. I think its great that your comparing the 2 like that, but something seems alittle off.

We have a local car with a stock long block, computer and TE-64E that made 527 RWHP, 660 RWTQ.

 

[86brick]

I think a cool dyno test would be a ported shroud 70GTQ (PTE) against a non ported shroud 70GTQ (Limit Engineering) cause I really wonder how much the ported shroud is worth.... Maybe that is the dyno testing that Louie did with Cal for GMHTP? Sound about right Louie?

 

[86brick]

Originally posted by John Wilde
We have a local car with a stock long block, computer and TE-64E that made 527 RWHP, 660 RWTQ.

John, that is pretty damn impressive for the stock longblock!

 

[Louie L.]

Originally posted by 86brick
I think a cool dyno test would be a ported shroud 70GTQ (PTE) against a non ported shroud 70GTQ (Limit Engineering) cause I really wonder how much the ported shroud is worth.... Maybe that is the dyno testing that Louie did with Cal for GMHTP? Sound about right Louie?

The test conducted by GMHP was solely to test the new technology. The PTE turbo we tested was not the ported housing unit but the "GSCA" approved... unit.
Its the regular 4in inlet unit , the same as the other turbos.It still made more power.The other PTE was a regular 70-p trim.And my old Limit 70 with the GTQ exhaust wheel. BTW that article is set to be out soon.

 

[HighPSI]

The article will be on the news stands the first week in August.

 

[86brick]

Originally posted by Louie L.
The test conducted by GMHP was solely to test the new technology. The PTE turbo we tested was not the ported housing unit but the "GSCA" approved... unit.
Its the regular 4in inlet unit , the same as the other turbos.It still made more power.The other PTE was a regular 70-p trim.And my old Limit 70 with the GTQ exhaust wheel. BTW that article is set to be out soon.

Okay yeah I forgot that PTE made the 70GTQ w/out the ported housing to be legal for the GSCA TSM race(s).... Should be an interesting article nonetheless.... Definitely gonna have to check it out!

 

[EightSecV6]

The dyno test in question was a ported unit, I bet that surely made all the difference in the world, call and order yours now!!!! (send my check overnite Harry, the kids are hungry!)

 

[John Wilde]

lmao

 

[86brick]

Originally posted by EightSecV6
(send my check overnite Harry, the kids are hungry!)

LOL!!!!

 

[Otto J]

Originally posted by EightSecV6
The dyno test in question was a ported unit, I bet that surely made all the difference in the world, call and order yours now!!!! (send my check overnite Harry, the kids are hungry!)

Bill if you can afford your car, You can afford to feed half the hungry kids in Africa

 

[ttypewhite]

Louie L.- Did you find the happy meduim with your converter now? IF so which one do you have and what stall have you choosen? Very interested, because I am in the same boat with my T400. The converter is the last piece to my puzzle. I have a GTQ71, 83lbs, Fast, ported heads, cam, yada yada yada on a 109 block. Its a ATI T400 that I bought off of Billy at BG (thanks a bunch Billy). Just trying to save up somemore coin to get the matching converter from him aswell.

 

[Bmason]

I doubt if I get a check!

I too heard about this thread and after reading it I was on the fence as to comment or not? I think I know the car and have heard stories (no names) about what happened. If this is the car that I think it is, there were some major changes made to this vehicle. I heard the same thing...516rwhp at ~29psi or so with a 72bb and significant timing (25-26). I personally thought that was low, but knew there was more in it after tuning and fixing the basic crap that's always plagued that car (exhaust leaks for one). From what I was told, the car went back and with "better" heads and the GTQ turbo was dynoed again. It made 550 something on a day where the "conditions had changed, that's why it wasn't performing up to expectations with the additional parts." Expectation being 600rwhp range. <= AGAIN...the previous is all stuff that I've heard, I wasn't there and don't know...so ingest and digest accordingly!

Now, I personally believe that there is no way in hell that a 72bb, big injector, GN1 heads,Cotton FM, billet PTS 9x11, FAST equipped car (with decent timing) should only make 516 horses at 30psi! Maybe I'm thinking (heard) about the wrong car...maybe I'm not! If a "dyno pull off" does develop, I hope it's public (posted) because I'm going to make arrangements to be off from work so that I can attend.

-Bobby

 

[REDS HOT AIR]

that makes this thread kinda like a roll cage that dont connect to the frame ...looks good but not worth a poop

 

[GNSCOTT]

Put a PTE exhaust housing on the 72bb and re-do it. I'll bet the bb lags a hell of alot more with that PTE housing on it too.

 

[JCotton]

From what I was told, the car went back and with "better" heads and the GTQ turbo was dynoed again. It made 550 something on a day where the "conditions had changed, that's why it wasn't performing up to expectations with the additional parts." Expectation being 600rwhp range

From what Bobby has said, if that was the case then the "test" that was done wasn't really a test at all. I know of plenty of cars, full weight too, "3700lbs"that have run well into the 9's with a 72. Do the math, that is well over 500hp. Add a ported shroud housing and we are looking at another 20 plus HP.

I remember a number of years back when a Buick vendor claimed he only replaced a stock torque convertor on a customers car with a Precision Industries TC and the car picked up a full second at the track, 12.50 to an 11.50. What he failed to mention was the car had a T45a on it. DUH........ everyone ran out and bought PI convertors, before realizing they needed to put a turbo bigger than a stock one on.....

one more point, I heard of a GN owner that ran a 9.90 something on a stock block with a PT88, and of another that ran a 9.90 with a Turbonetics CPT70-P trim, does that mean the turbonetics 70 makes more power than a PT88?

 

[EightSecV6]

Re: I doubt if I get a check!

Originally posted by Bmason
I too heard about this thread and after reading it I was on the fence as to comment or not? I think I know the car and have heard stories (no names) about what happened. If this is the car that I think it is, there were some major changes made to this vehicle. I heard the same thing...516rwhp at ~29psi or so with a 72bb and significant timing (25-26). I personally thought that was low, but knew there was more in it after tuning and fixing the basic crap that's always plagued that car (exhaust leaks for one). From what I was told, the car went back and with "better" heads and the GTQ turbo was dynoed again. It made 550 something on a day where the "conditions had changed, that's why it wasn't performing up to expectations with the additional parts." Expectation being 600rwhp range. <= AGAIN...the previous is all stuff that I've heard, I wasn't there and don't know...so ingest and digest accordingly!

Now, I personally believe that there is no way in hell that a 72bb, big injector, GN1 heads,Cotton FM, billet PTS 9x11, FAST equipped car (with decent timing) should only make 516 horses at 30psi! Maybe I'm thinking (heard) about the wrong car...maybe I'm not! If a "dyno pull off" does develop, I hope it's public (posted) because I'm going to make arrangements to be off from work so that I can attend.

-Bobby

I can see where this whole thread is going, we have dyno'd this car a minimum of 50 pulls and probably more. The dyno SAE horsepower is corrected for weather conditions so you can discount that whole weather thing or whatever you were trying to do with that!. We swapped the heads on the car in question and dyno'd it with the better heads and the 72 at 516rwhp (if I remember correctly, the heads picked it up about 20 hp or so). I dont really know "what you were told" but It would be totally ridiculous for me to make that post claiming what I feel was a major increase in power from just a turbo change and that not be the case......What do I have to gain???? I can make more money from the sale of a BB72!!!!!!We changed ONLY the turbo (GTQ 70 w/ ported shroud) and dyno'd it again for 573rwhp. The car ran .5 faster than it EVER has in Bowling Green this year with the same tune we had on the dyno but I guess that was because the weather was so great for racing (90+ deg and 100% humidity!). So BMason , while you may know SOME of the combination on the car, you certainly do not have the timeline or the facts straight, you obviously know the owner, tell him to bring the 72 back over and I'll put it back on for him FREE. Yes Jack,it was in fact a legitimate test and I surely hope you are not grouping with the likes of the vendor mentioned in your post.....Let the mud slinging continue.

 

[S2V6RACER]

Originally posted by JCotton

one more point, I heard of a GN owner that ran a 9.90 something on a stock block with a PT88, and of another that ran a 9.90 with a Turbonetics CPT70-P trim, does that mean the turbonetics 70 makes more power than a PT88?

The root of the issue here is there are so many people that think they can just bolt up a big turbo and it is the principle reason they are making power. It is all about combination and all of that has to be right to get the rated power out of any turbo and make E.T. Your 88 vs. a 70 is a perfect example of that and we all know that there are many other examples of over turbo'ed cars that give all the claim to fame to the turbo itself, when in all reality it really isn't making squat in comparision to the turbos rated power.

I'd like to see that 88 turbo run on that 231" stock block car.