PTE 6266 Cea DBB vs. PTE 6466 Cea DBB with. 63 exhaust

[jmendlik]

I purchased the 6266 DBB with the CEA wheel when it was released last year and then 30 days later they released the 6466... I have installed this 6266 and am totally happy with it but as always "I wonder" am I missing some power not having the new 6466 wheel? Any thoughts out there?
109 motor
E85.. Turbo tweak chip. Power logger /wideband
Fully Ported big valve iron heads
218/224 billet roller cam, roller lifters, arms
Pte front mount
120 lb injectors
Ptc NL converter from dusty, jimmy's full billet tranny...
Juilos single nozzle alky kit

 

[bison]

With e85 you have a huge window of opportunity. What mph does the car run currently?

 

[jmendlik]

No track times yet.... More of a should I have waited for the 6466 to be released... Is 25 lbs of boost that different on each of these?

 

[bison]

No track times yet.... More of a should I have waited for the 6466 to be released... Is 25 lbs of boost that different on each of these?

If it has enough spring and cam it could be. 25psi at 5500rpm vs 25psi at 6000rpm with the same mass efficiency is probably 150-175hp on a 250ci engine. So 15-20lbs/min more air even though the boost pressure is the same. That's a lot more air. With less than 5700rpm I wouldn't expect much difference at that boost pressure. The 62cea went 77-78lbs/min on one of my engines. That's a lot of air out of a small compressor. The 65 turbine was a decent match to it. It was 650-660whp@25psi. It stalled at 697whp/29psi. The cam had more than optimal overlap for the combo and the CR was about .5 less than optimal. Those wheels have so much potential it takes a lot of engine to really see it.

 

[jmendlik]

My plan would be to run my motor to max 5800... Sounds like the 6266 will be more than enough... Do you think it would "hurt" my combo-Performance wise if I did upgrade to that 6466 with boost no more than 25-26 lbs?

 

[bison]

My plan would be to run my motor to max 5800... Sounds like the 6266 will be more than enough... Do you think it would "hurt" my combo-Performance wise if I did upgrade to that 6466 with boost no more than 25-26 lbs?

I would consider running more boost if I wasn't changing anything else and wanted to get more out of the 6466. I'd expect an engine like yours to flow about 68-70lbs/min at 25psi.

 

[jmendlik]

Not sure my motor is ready for anything over 25-26lbs boost.. No girdle just caps and studs...

So swapping to the 6466 may yield marginal power increase at same boost levels I run with the 6266...


Do you know if the 6266 can be sent into PTE and have it rebuilt to a 6466? May be easier than trying g to sell my 6266 and take a loss...

 

[coach]

If it has enough spring and cam it could be. 25psi at 5500rpm vs 25psi at 6000rpm with the same mass efficiency is probably 150-175hp on a 250ci engine. So 15-20lbs/min more air even though the boost pressure is the same. That's a lot more air. With less than 5700rpm I wouldn't expect much difference at that boost pressure. The 62cea went 77-78lbs/min on one of my engines. That's a lot of air out of a small compressor. The 65 turbine was a decent match to it. It was 650-660whp@25psi. It stalled at 697whp/29psi. The cam had more than optimal overlap for the combo and the CR was about .5 less than optimal. Those wheels have so much potential it takes a lot of engine to really see it.

Hey Brian,
I'm staying with my billet 67HPQ, but I see a lot about this 6466. You know most of my combo including my Gn1 race ported heads...
Keep in mind...I'm 250cubes and im running the .85 housing.
What's your thoughts?

 

[bison]

Hey Brian,
I'm staying with my billet 67HPQ, but I see a lot about this 6466. You know most of my combo including my Gn1 race ported heads...
Keep in mind...I'm 250cubes and im running the .85 housing.
What's your thoughts?

The t04z compressor is done around 78-80lbs/min. The fastest time I've heard of with a cast 67 in a full weight Buick is 9.8x. It had a 76p exhaust wheel too. It also had a small off the shelf 206/206 hyd cam. The 67cea (assuming thats what you have) has been a second faster. I would probably use the .63 precision housing to reduce laziness. I don't think there would be much power with the .85 vs the .63 unless looking to run deep into the 9's. The 68f1 is very big and flows a lot of air. I might have a .63 precision housing for the 68f1. If I do I'll send it to you and you can back to back them. The 6466 will spool much faster and may support close to the same power. At 28-30psi I'd expect 850hp.

 

[jmendlik]

Do you know if the 6266 can be sent into PTE and have it rebuilt to a 6466? May be easier than trying g to sell my 6266 and take a loss...

 

[bison]

Do you know if the 6266 can be sent into PTE and have it rebuilt to a 6466? May be easier than trying g to sell my 6266 and take a loss...

Physically it could easily be done. Idk what precisions policies are though. You will take a big hit either way.

 

[coach]

850 flywheel horsepower?

 

[bison]

850 flywheel horsepower?

Yes

 

[1badbuford]

Pm sent on turbo....

 

[tonysmach]

I purchased the 6266 DBB with the CEA wheel when it was released last year and then 30 days later they released the 6466...

Similar happened to me. I purchased the DBB 6765HP billet CEA and then less than 2 weeks Precision comes out with 6766 then the 6466. Am I missing any performance with by current 6765. I have no problem with spoolup with my stroker, GN1 heads, and 218/218 cams and supporting valvetrain components. I will run it to 28 PSI with race fuel this spring. Bison can you give me your comments.

 

[L8TRH8R]

I'm thinking about swapping to a 6466 from my 6765, but, I'm actually thinking the TAD bit of lag I have is a good thing....

 

[bison]

Similar happened to me. I purchased the DBB 6765HP billet CEA and then less than 2 weeks Precision comes out with 6766 then the 6466. Am I missing any performance with by current 6765. I have no problem with spoolup with my stroker, GN1 heads, and 218/218 cams and supporting valvetrain components. I will run it to 28 PSI with race fuel this spring. Bison can you give me your comments.

Does your car trap over 137mph yet? Id expect 137-138mph conservatively at 28psi on 116 octane. Probably over 140mph after a few passes in decent air

 

[tonysmach]

Does your car trap over 137mph yet? Id expect 137-138mph conservatively at 28psi on 116mph. Probably over 140mph after a few passes in decent air

I have not run it all out yet. first and only time was after new engine build so I took it easy. It ran 127mph at 20 psi. So if you think it may reach 140mph at 28psi...I would say the 6466 and 6765 is comparable. Does that sound right?

 

[bison]

You would hit choke flow on the turbine side with the 6765 before the comp wheel is done. The 6466 is likely a better match of wheels. I've yet to see someone run either hard on a Buick. Keep in mind a cast 6776 has been in the 9's@140mph and that engine had an off the shelf cam in it.. A 6765 should be able to run at least that quick under the right conditions. It comes down to the engine and tune when running these turbos to their potential or close to it.

 

[tonysmach]

You would hit choke flow on the turbine side with the 6765 before the comp wheel is done. The 6466 is likely a better match of wheels. I've yet to see someone run either hard on a Buick. Keep in mind a cast 6776 has been in the 9's@140mph and that engine had an off the shelf cam in it.. A 6765 should be able to run at least that quick under the right conditions. It comes down to the engine and tune when running these turbos to their potential or close to it.

Brian, thanks for the comments. If I ever get to 140mph, that will be fast enough for me.