Had the Bullitt on the Dyno for the first time (results)

[TRC51]

I have been trying to make decisions about a lot of things regarding my car. Not knowing what direction to go in, I decided I needed to know how healthy my motor is. I ran the quarter a few times this year, but that's not a great gauge considering I am not a regular runner. That being the case I decided to get a baseline dyno done and found what seems to be a reputable shop locally. Attached the printed chart, but I am pretty happy with the results. To my knowledge, this car is running the stock pulley, air filter and tune from Roush with the stock TB. Results: 385rwhp and 361rtq with 5.5psi of boost.

Dyno seem to be too "happy"? It was a cool day. Thoughts?

 

[eighty6gt]

I should really dyno my car with 8-9 psi. I bet I get similar #'s... haha.

 

[702GT]

That's about tits on for a stock 3v roush m90. You can squeeze more out of the m90 in minor bolt ons and a tune, but when you go for a pulley the m90 is gonna get hot(ter).

Your numbers are solid, if you were to consider going for more power IMO you should look at a new blower. As for the health of your motor, it's no different than any other stock 3v. As long as you've kept up on maintenance, these mod motors hold together extremely well. I didn't put the procharger on my car til 52k/mi, after years of non-competitive track runs, street races, nitrous abuse, and cammed reving to 6700rpm. Motors at 67k/mi and shows no signs of trouble, and it loves the boost.

If you're not looking to build your motor yet, obviously your power goals can't be too outrageous. Plenty of blower options out there that can keep you in a safe for stock engine range and still have the potential to put you in the built motor power range when you're ready.

 

[05gtowner]

Those are about stock coyote numbers so yea pretty good considering our cars are only 3V's. LOL Like already stated the 3v 4.6 motors are solid. Add some forged rods and pistons and they are pretty damn strong.

 

[bcb06gt]

Seems about right to me. My Saleen shaker SC is at about 8.5 psi and puts down about 430rwhp. At about 15 psi/1#, that is very close.

 

[skwerl]

That's where my Bullitt was with the M90 and stock pulley.

 

[eighty6gt]

Makes me wonder why does my car feel slow at almost 9psi?! That's a lot of power

 

[702GT]

Makes me wonder why does my car feel slow at almost 9psi?! That's a lot of power

9psi behind 200CFM and 9psi behind 2,000CFM means a big difference in power production. Boost on a gauge is a measure of resistance (or restriction) ahead of the sample source. It says nothing for how much air is actually flowing through the manifold.

My Procharger makes 450whp@7psi. On the same dyno I've seen a pullied '08 427R make 410@7psi.

What can be more irritating for the Roush guys is my centri making 470wtq@5~psi while their M90's struggle to break 400wtq.

Yet, a well sized turbo 3v at the same boost level as me will crush me lol.

Tune/fuel plays a big part when talking numbers of any kind (track ET or Dyno). A very conservative tune on pump petrol might not give you an aggressive torque curve in the bottom end, which is where a lot of "it feels fast/slow" comes from. A more aggressive tune with higher octane fuel to support more timing will make a big jump into the torque curve down low, giving the whiplash effect.

 

[TRC51]

That's about tits on for a stock 3v roush m90. You can squeeze more out of the m90 in minor bolt ons and a tune, but when you go for a pulley the m90 is gonna get hot(ter).

I think for now that is going to be my goal.... just a bit more at a low cost. I already have the FRPP TB. Add in the JDM pulley, tune and AF kit and I should be pushing around 60rwhp more (from the claims). That would put me right about the limit of the motor without building it.

Those are about stock coyote numbers so yea pretty good considering our cars are only 3V's. LOL Like already stated the 3v 4.6 motors are solid. Add some forged rods and pistons and they are pretty damn strong.

That's the rub.... I have realistic goals for the car. It's more of a show piece/take it to work/make it my own car. It's my "first hot rod", similar to Skwerl, so I really would like to get it to my "perfect" street hp goal of 500 - 550 at the tire. BUT, that would mean I have to build the motor and change blowers to a TVS2300..... which is a LOT of money and a big commitment. Since I am unsure about what I am doing with the car long term.

Seems about right to me. My Saleen shaker SC is at about 8.5 psi and puts down about 430rwhp.

Pretty much right where I want to be!

That's where my Bullitt was with the M90 and stock pulley.

Was that with a VMP tune? You seem to have a good chunk more TQ. I always reference your build while trying to make decisions.

Makes me wonder why does my car feel slow at almost 9psi?! That's a lot of power

Exactly the reason I decided to get a dyno done. I run with some powerful (relatively) cars around me and while I do okay, I just wanted to know for sure the car was a strong as I hoped it would be. I was hoping it would be around 370 - 375 to the tire, so regardless of whether the 385 number is dead accurate, it confirms my hopes that the motor is SOLID.

To clarify, I am not the original owner, so.... it's like a box of chocolates.

 

[05gtowner]

You could forge the motor for a relatively low price of around 4k and put it back together using your existing setup and upgrade the supercharger and other parts as funds allow. I know around me there is a builder with a good reputation and he builds a lot of mod motors especially ones that see boost. I got an estimate from him for $3800 a complete longblock rebuild, reusing my stock crank but adding forged rods and pistons, cleaning up by heads and assembling. He would also give me a 1 year mileage unlimited warranty. He rated the power of the parts at over 700hp. Plenty for what I wanted. I have my 05 long block on a stand in my garage waiting on funds. So I understand your dilemma.

 

[Pentalab]

What yr is ur car ? Is it a Roush car or just a GT with a m90 installed ?

 

[TRC51]

What yr is ur car ? Is it a Roush car or just a GT with a m90 installed ?

It's a 2008 Bullitt. The blower was put on in the Roush factory, the car has a Roush plate on it and Jack Roush signed the car..... so the answer to your second question is................. Yes.... to both.

 

[skwerl]

It's a 2008 Bullitt. The blower was put on in the Roush factory, the car has a Roush plate on it and Jack Roush signed the car..... so the answer to your second question is................. Yes.... to both.

Sell it to me.

 

[Stephen31201]

Then there is the Roush guys that are making well over 400wtq at 2800rpms with that little bitty blower Change the pulley, bump the timing, feed that baby corn and let her eat!

 

[TRC51]

Sell it to me.

I'll keep you in mind.

Then there is the Roush guys that are making well over 400wtq at 2800rpms with that little bitty blower Change the pulley, bump the timing, feed that baby corn and let her eat!

Wait.... whaaaaaatt??

 

[Stephen31201]

My MP112 is very similar in size and I was making 400wtq at 2800rpms and 420 max and 428rwhp (long tubes, CAI, and a 10lb pulley). Added E85 and timing and got another 50hp and ridiculous torque down low.

 

[702GT]

Then there is the Roush guys that are making well over 400wtq at 2800rpms with that little bitty blower Change the pulley, bump the timing, feed that baby corn and let her eat!

E85 is beast.

 

[TRC51]

My MP112 is very similar in size and I was making 400wtq at 2800rpms and 420 max and 428rwhp (long tubes, CAI, and a 10lb pulley).

When you first mentioned it I thought you were talkng about making that power on ~5.5lbs. Would not the M90 make the same given your mods? JDM has confirmed I can get to around 430whp with the FRPP TB, pulley, filter and tune. Add in the long tubes and they said I would run in the 450whp range. In fact, that was the course they recommended for getting maximum power without building the motor.

 

[Stephen31201]

Remember that boost is a reflection of restriction. I run a 10lb pulley but only register 6.5lbs of boost. It was 9lbs but then I added the long tubes, and pro chamber mid pipe and now its below 7 lbs but the HP went up. From what I have read, stick to the stock TB as that is more important for blow through forced induction, add a CAI, free up the exhaust and get Lito to tune it. And definitely get an Air/Fuel ratio gauge as that is the only way to do it right. If you have an E85 station close by that is icing on the cake.

 

[TRC51]

Remember that boost is a reflection of restriction. I run a 10lb pulley but only register 6.5lbs of boost. It was 9lbs but then I added the long tubes, and pro chamber mid pipe and now its below 7 lbs but the HP went up. From what I have read, stick to the stock TB as that is more important for blow through forced induction, add a CAI, free up the exhaust and get Lito to tune it. And definitely get an Air/Fuel ratio gauge as that is the only way to do it right. If you have an E85 station close by that is icing on the cake.

Why would I bother changing direction though? With the TB JDM claims about 20 - 30hp with FI applications. Add in their pulley and tune for another $1K and I have all the power I dare put on the motor. The "only" downside is heat, but again.... this is not a drag car and does not get worked regularly. I also read that the long tubes are a giant pain in the ass and I need to pass emissions.... so I don't think I would bother there.

Now... if I decide to go all out and build the motor, different story. Regardless, I don't think I will ever go to E85. It's around enough in my area, but not enough in the places I drive the car. Kind of like diesel, not every station has it and I hate having to think about that kind of stuff.