Vortech Crown Vic not making power

[thespanishtaco]

To keep it short and sweet. I’m running a V1 S-Trim Vortech with a 3.25” pulley and a +10% OD Crank pulley. 31x10x3” air/air intercooler, 3.5” inlet pipe, 3” outlet pipe. Lightning MAF (draw through), 39lb injectors. The engine is a fully built 4.6 2V running 8.91:1 CR with stock PI heads and cams. Stock PI intake manifold, accufab plenum/TB. 2.5” dual exhaust, 4 cats, shorty headers. Trans is a built 4R70W, 2500 stall 9.5” converter. 3:73 rear end, 26.5” tall tires. It was tuned on a Superflow AutoDyn dynanometer.


I was hoping for over 400rwhp and a complementary torque, but the numbers came back very disheartening. Peak 356rwhp, 9psi @ 6000, 341rwtq @ 4500

I apologize for the quality, didn't get digital copies :(
http://img.photobucket.com/albums/v260/thespanishtaco/IMG_4020.jpg

http://img.photobucket.com/albums/v260/thespanishtaco/IMG_4016.jpg

http://img.photobucket.com/albums/v260/thespanishtaco/IMG_4019.jpg

The air/fuel was taken by a sensor before the cat, not a sniffer thing.

So my question, what do you think is going on with my car? Am I wrong to of expected higher numbers, or is this close to what it should be running?

[LANDY]

Did you check for boost leak?

[sailsmen]

Superflow AutoDyn dynanometer - different dyno types have a different reference for hp/tq.

http://www.ls1tech.com/forums/dynamometer-results-comparisons/105079-dyno-jet-vs-superflow.html

[RacerX]

I wonder what your spark advance is set for low, mid and high rpm. What plugs and gap?

[thespanishtaco]

I'll be doing a boost leak test this coming weekend. By the information in that thread about dyno's, my numbers are actually even lower than what's posted,

Would I be able to see any of the spark advance tables in livelink datalogging? NGK TR6's, I'll have to double check the gap but iirc it's .035

[RacerX]

Would I be able to see any of the spark advance tables in livelink datalogging? NGK TR6's, I'll have to double check the gap but iirc it's .035
Yes. That does seem low, esp up top. Right about 4300+, you're dropping out. Could be spark, boost leak...

[SpartaPerformance]

Looks good to me, the A/F is mint! it doesn't spike, your curves are pretty consistent. When you consider a stock CV PI is about 210RWHP an addition of 155RWHP is pretty damn impressive.

[ntd]

looking back at one of Dennis cars he had an 03 cv sport all stock except for a Novi 1200 and a 3.4 blower pully at 10psi made 348 RWHP and 353 RWTQ

http://www.mercurymarauder.net/forums/showpost.php?p=903277&postcount=6

9 psi seems low looking at this other car

[MOTOWN]

i think those numbers are right on par for a 2v cv pi, thats a big increase from stock

[LANDY]

If you guys do the math that car is supposed to be right at 13psi with the current pulley setup.
The blower is spinning right at 44584 rpms, that's one of the most efficient rpms for the s-trim before it starts being overspun. The power doesn't seem that bad according to the CR ratio, remember its a centrifugal it would make more power with higher CR ratio.
Put a bigger blower 8 rib setup and boost 18psi on that thing and you will se over 500to the wheels.

[MOTOWN]

i do think 9psi is a bit low, but 18psi i think the motor would check out at that boost level

[LANDY]

i do think 9psi is a bit low, but 18psi i think the motor would check out at that boost level well he said it was fully built so I assume is forged

[MOTOWN]

well he said it was fully built so I assume is forged

oh i didnnt see that, well in that case crank it up:banana2:

[Kennyrauder]

I beg to differ. I am running 8 pounds of boost on my marauder with a vortech.....it,ll be around for a long time.

[MOTOWN]

I beg to differ. I am running 8 pounds of boost on my marauder with a vortech.....it,ll be around for a long time.


what vortech are you running,and what kind of power does it make at that boost level?

[Bradley G]

I'm guessing the dissapointment also filters through towards the way the car responds to throttle input, compared to the previous set-up.

[RacerX]

Looks good to me, the A/F is mint! it doesn't spike, your curves are pretty consistent. When you consider a stock CV PI is about 210RWHP an addition of 155RWHP is pretty damn impressive.
Looking at it from that perspective gives it a whole new light. I was looking at just end numbers and how a centri curve would look on a 4v.

[FormulaMarauder]

2V engine with weak exhaust work. Check for belt slip, especially with that OD pulley on there. Is this a race tune with high octane 100+ in the tank? Your plugs and gap is just fine. You have 410hp roughly before driveline loss. Open your exhaust up a bit, get a more aggressive tune and run race gas before you hit the dyno. You'll add about 30hp, if not more.

[thespanishtaco]

I wouldn't be making 11psi at 6450rpm if the belt was slipping. The tune is for 93 octane.

I'm just looking at the math that Vortech's stock kit supplies a 3.6" pulley for 8psi on a stock Mustang GT at 6000rpm. I understand drivetrain losses. I understand I'll lose boost from the intercooler. I can't honestly believe that stepping three pulley sizes down AND having a +10% overdrive crank that the intercooler negated all but 1lb of boost.

The power level for an auto at 9 psi and an okay-at-best exhaust is correct. That's not what I'm arguing. I'm saying the car is down on boost (and subsequently, down on power) It's my fault for not clarifying that a bit better in my original post. Are there any other possibilities besides a boost leak that could be causing that? Is that argument, at least, correct, that it is down on boost?

[FormulaMarauder]

I see you are from CT. Click on the link in my sig. They are the premier tuners for 2V and 4V engines, N/A and blown. They dynotune my car....look at my times. Oh, and I have a completely stock engine.
J & M is no joke.

[Dennis Reinhart]

To keep it short and sweet. I’m running a V1 S-Trim Vortech with a 3.25” pulley and a +10% OD Crank pulley. 31x10x3” air/air intercooler, 3.5” inlet pipe, 3” outlet pipe. Lightning MAF (draw through), 39lb injectors. The engine is a fully built 4.6 2V running 8.91:1 CR with stock PI heads and cams. Stock PI intake manifold, accufab plenum/TB. 2.5” dual exhaust, 4 cats, shorty headers. Trans is a built 4R70W, 2500 stall 9.5” converter. 3:73 rear end, 26.5” tall tires. It was tuned on a Superflow AutoDyn dynanometer.


I was hoping for over 400rwhp and a complementary torque, but the numbers came back very disheartening. Peak 356rwhp, 9psi @ 6000, 341rwtq @ 4500

I apologize for the quality, didn't get digital copies :(
http://img.photobucket.com/albums/v260/thespanishtaco/IMG_4020.jpg

http://img.photobucket.com/albums/v260/thespanishtaco/IMG_4016.jpg

http://img.photobucket.com/albums/v260/thespanishtaco/IMG_4019.jpg

The air/fuel was taken by a sensor before the cat, not a sniffer thing.

So my question, what do you think is going on with my car? Am I wrong to of expected higher numbers, or is this close to what it should be running?


Well hopefully you have a good tuner and he can help narrow it down you need to see if you are having belt slipage as well, I map boost on my dyno at 9PSI times 15 = 135 HP added to the base of 233 RWHP you are at the range you should be for this boost, now the boost should be higher with a 3.25 pulley so I would check the by pass and check boost before and after the IC this will verify there is no loss do to the IC. The general rule of thumb is 15HP for each pound of boost.

[LANDY]

I wouldn't be making 11psi at 6450rpm if the belt was slipping. The tune is for 93 octane.

I'm just looking at the math that Vortech's stock kit supplies a 3.6" pulley for 8psi on a stock Mustang GT at 6000rpm. I understand drivetrain losses. I understand I'll lose boost from the intercooler. I can't honestly believe that stepping three pulley sizes down AND having a +10% overdrive crank that the intercooler negated all but 1lb of boost.

The power level for an auto at 9 psi and an okay-at-best exhaust is correct. That's not what I'm arguing. I'm saying the car is down on boost (and subsequently, down on power) It's my fault for not clarifying that a bit better in my original post. Are there any other possibilities besides a boost leak that could be causing that? Is that argument, at least, correct, that it is down on boost? yes, its a fact you are down on boost and ofcourse power. Dennis post a good point also.

[LANDY]

. Check for belt slip, especially with that OD pulley on there. the od pulley will contribute against beltslip. If he does have beltslip it wont be it unless the pulley is bad.

[FormulaMarauder]

V1 S-Trim on a 2V engine, weak exhaust and a 93 tune. Your numbers are more than accurate.