Interesting turbo/dyno test tonight= bigger isnt always better

[bison]

Slight millof the heads to increase the c/r?

i wish that would net 50whp.

 

[Squid4life]

Backcut the valves, or added another angle or two?

 

[daves87gn]

There is only one thing he could have done to make a difference like that.

maybe raise seat pressure on springs???

 

[jpwalt1987]

Went to a smaller cam??

 

[jasjamz]

Corrected the crank sensor ring on the balancer or set the cam sensor at 20* instead of 25*?

 

[bison]

Corrected the crank sensor ring on the balancer or set the cam sensor at 20* instead of 25*?

No. The car has XFI and any error in the interrupter ring is easily offset in the functions. The cam sensor location doesnt matter and its not timed to #1 on this engine anyway. You can be off a lot on the cam sensor and it wont matter.

 

[rag231]

valve stem seals and new retainers?

 

[wmerrell]

Guessing game! i like!

how about the spark? Plugs, wires, coil?

 

[TurboBob]

head gasket problem? New port job on the heads? Different turbo config?

Bob

(how many guesses do I get?)

 

[salvageV6]

Slapped on some aluminum heads and sent it back.

I thought he was too busy to port anything.

 

[jasjamz]

Valve preload adjustment!

 

[slimtastic]

did you put it on a mustang dyno and play with the axle weights in the software? that'll get you 50 hp lol

 

[pontiac69fb]

I had a car come in the was down on power with a 6776 turbo,made 542 at 28#s, gave the motor to RPE to have him check things out, he made a few changes,nothing new,i know he freshened the heads(he did not freshen the motor) nor tell me what he did,but the car redynoed at 604 at 28#s afterwards.

Well freshening or porting the heads will cause the boost to drop if left at the same wastegate pressure. For example 28psi with a 6776 turbo on champion aluminum heads is not equal to 28 psi with stock heads. Other than that updating the tune by smoothing out the timing curve, maximizing air fuel ratio, and running it with better gas could easily account for the 60 rwhp imo.

 

[bison]

Well freshening or porting the heads will cause the boost to drop if left at the same wastegate pressure. For example 28psi with a 6776 turbo on champion aluminum heads is not equal to 28 psi with stock heads. Other than that updating the tune by smoothing out the timing curve, maximizing air fuel ratio, and running it with better gas could easily account for the 60 rwhp imo.

We are not goign to reveal exactly what it was but it had nothing to do with the tune or the dyno. Even if we did say it most wouldnt be able to duplicate it. I posted a lot about it in the past coupe years. All runs were done on dynojet dynos and all runs were tuned with an XFI at the same targets and timing with nearly zero correction. No fuel delivery or ignition problems either. The only thing done to the heads that would matter is the valve job and your not getting that much pickup even if you had a bad seal on all valves.

 

[jasjamz]

So hard parts could have been repalced?

 

[slimtastic]

We are not goign to reveal exactly what it was but it had nothing to do with the tune or the dyno. Even if we did say it most wouldnt be able to duplicate it. I posted a lot about it in the past coupe years. All runs were done on dynojet dynos and all runs were tuned with an XFI at the same targets and timing with nearly zero correction. No fuel delivery or ignition problems either. The only thing done to the heads that would matter is the valve job and your not getting that much pickup even if you had a bad seal on all valves.

.....so your not gonna tell us......

 

[bison]

So hard parts could have been repalced?

no hard parts replaced

 

[Boost231]

people have to keep some secrets. keeps people thinking and on there toes

 

[bison]

.....so your not gonna tell us......

We never indicated i would. This thread is way off topic at this point. Im testing turbos right now. Waiting for a cool down as i type.

 

[jasjamz]

Which turbos? How big do you plan to go before you stop?