How fast with PT6152E on pump gas?

[Marc87GN]

I think I have a good setup for straight pump gas, but I'm not sure how fast I should expect to go. I would like high 11s at about 115 mph, but that doesn't mean it will happen. Worse case , I will call Jack Cotton after Xmas and get a BB T70 to get the job done, but I was wondering what should I really expect. I'm able to run 18-20 psi in 50-60 degree air without any knock up until about 105 mph and then when the converter locks, I get about .7-1.5 degrees. I tried locking it earlier, but the boost climbed to 23 psi and I would get about 4-5 degrees of knock so now I run it unlocked until over 100 mph.

The other problem is the rpms only drop from 5500 to 5200 on a shift so I'm sure I'm blowing through the converter a little bit. I will probably have it tightened a bit to make a little more efficient, but boost comes right up with it the way it is. Anyway, any ideas are appreciated.

 

[Slow91z]

I've gone 7.8's in the 1/8th mile in my car with that turbo on pump gas which is like 12.3's or so...20 psi, 18* of timing, totally stock long block.

IMO with your motor work and assuming a good 60' you should go 11's.

 

[turbov6joe]

That turbo will take you into the 10's with the right combo. You have what's needed to run 120+ mph in the 1/4...no problem with tuning. I ran 120.23 mph with a TE44 and an otherwise stock motor + alky.

 

[Marc87GN]

Thanks for the replies guys. I will have to hit the track in the spring and see where I am and go from there. if I'm not where I would like to be, then I'm moving up to a BB T-70. I think that would definitely put me deep in the 11s on pump gas. I may just say screw it and get Razors Alky kit and spin the life out of the PT61. We will see after a few passes on a good tire.

 

[turbotwister]

Hi,

i have built several turbo buicks with similar combos to yours.we currently have a car with a 61 on it with VPE heads and intake that goes consistent 11.6's at 117 with a non-lock up trans(th-350).it has stock suspension.
we are running about 17-18 pounds of boost on "pure" 93 octane and a TURBOTWEAK chip.


Nick,

 

[JDSfastGN]

It should go 11s around 113-115 on pump gas i would think. But i would highly recomend Razors alky kit, its too easy not to. I have a friend with a 61, VPE heads, stock cam, stock untouched shortblock and alky going 11.07 at 119 (mph should be high, its a tuning problem) on only 24 psi and drag radials

 

[Marc87GN]

Hi,

i have built several turbo buicks with similar combos to yours.we currently have a car with a 61 on it with VPE heads and intake that goes consistent 11.6's at 117 with a non-lock up trans(th-350).it has stock suspension.
we are running about 17-18 pounds of boost on "pure" 93 octane and a TURBOTWEAK chip.


Nick,

I would be real happy with 11.60s @ 117 mph. Thanks! The car definitely feels strong and 1st & 2nd are useless on street tires. I can't wait to put on some D/Rs and feel what 1st pulls like. I have a little trouble with the boost jumping 1-2 psi when it locks up at 105 mph and I get some knock. Other than that, I get zero knock with 20 psi all the way to just over 100 mph.

 

[Slow91z]

Lock's up?? or do you mean 4th gear??

If I were you I'd leave it in 3rd at the track.

 

[Marc87GN]

Lock's up?? or do you mean 4th gear??

If I were you I'd leave it in 3rd at the track.

With the Extender, I can have it lock up from 45-105 mph. I had it in the 70s, but it would lock and the boost climbed to 23 psi and I would get some knock. It felt great, but 4.5 degrees didn't sound good. This is the only way it stays pinned at 20 psi and I get zero knock. If I lock it up earlier, the boost climbs and I get some knock.

 

[49-blues]

Turbotwister- what size stall on the 350 trans?

 

[turbotwister]

Stall

Turbotwister- what size stall on the 350 trans?

the converter stalls about 3400 at 10 pounds of boost at the line.

1.6 60ft

 

[RobV6]

RE; Maybe easier

I had a GN.60,000 org miles. stock block. stree chip with 36 pnd injecters.

Stretched intercooler. downpipe,49 turbo. Drove the car 80 miles to e -town. Car was hot form drive. Went 12.18 first run. 20 pnds boost 18 in second. Point is I had fun with this car. Though stolen.

I am now looking for a simple motor. I drove a stock block car with a 67 turbo injecters forgot. Pump Car freeked me out. Combination. Maybe 70 is too much. Just given you some thought......Rob

 

[Blazer406]

FWIW... the OP of this thread sold his car nearly two years ago.....

You dug this thread up from the dead.....