These rods are not designed for that high an RPM. They do not fail in compression, They fail on the down stroke when you pull them apart. That is why the positive displacement SC works well on this motor. You do not need mega rpms to get boost and power. I have my limiter set at the stock limit. If you change them than have at it...untill you do I would not even go to 6400. Good luck.

 

Check your post. Compression and downstroke are the same. I think I agree with you but.......

 

My 06 was set at 6800 rpm with all three blower setups and I would occasionally hit the limiter, mainly while playing around on the street. I never had an issue but that's certainly not to say that you or anyone else wouldn't have a problem.

You know Brian, to spin that blower a little better you could always go smaller pulley and limit the rpm; kinda the opposite idea of what you proposed by spinning it higher. You would just need to be mindful of not hitting the limiter but your car is an auto, it shouldn't be that difficult.

 

Keep in mind Ford increased redline to 6500 for the 08/09 Bullitt... without any other improvements to the engine.
As I understand it, the tuners will increase to 67-6800 on request, so that you can get a full run to 6500. Because with the stock limit at 6500 on the Bullitt, its starting to pull back a bit around 6300...

 

I had never even considered it until my Tuner suggested it. He uses it on his own Mustangs, one of which is a 9-second roll-caged monster convertible with a Vortech YSi trim blower making ungodly amounts of boost. This guy is a very, very well respected Mustang tuner whose specialties are superchargers and methanol injection. He's tuned some pretty wicked rides in our area and I've never heard of any of them going kaboom (he errs on the conservative side to protect his reputation for tuning).

 

Exactly. I would want a failsafe tune to dial back timing if the meth stopped flowing for any reason.

 

I've heard that the factory manifold is crud, and have also been considering C&L's new intake.

 

Well, since I do not have a positive displacement blower, I have to make the best of what I have. The centrifugal blower shines the faster it spins, so I've been trying to match other components to that power band. I ran 6800 rpm's for over a year in the car with dozens of passes at our local dragstrip without incident before the blower went on. With the blower, I dropped the shift points down to 6400 rpm's to be safe and have been running the car very hard for 1.5 years without incident. I guess I'd leave well enough alone until the internals are forged.

 

I've thought about a smaller pulley, but I have such a narrow powerband with the stall converter hitting at 4800 rpms and the shifts happening at 6400 rpm's. That's only 1600 rpm's of operating range at wide open throttle. Lowering the shift points (while spinning the blower impeller faster) would really shrink that operating range. Arghh - what to do!

 

I think that's part of the reason I feel okay at 6400 rpm's - knowing that the Bullitt is fine to 6500 rpm's. However, the cylinder pressure is much higher with a blower, so I feel like I'm walking a fine line.

 

What about those that have the FRPP blower installed by a Dealer? Do they change cylinder pressure in any way or just bolt it on the stock 4.6 in the Bullitt with the appropriate pulley?

 

Any blower - including the FRPP blowers - will increase the cylinder pressure. The non-intercooled kit rated at 400 flywheel hp is a nice blower. The dealership I work at installed one on Bullitt #6333 (belongs to TMS member "Smitty"). I'm sure Smitty would be happy to tell you more. There is also the intercooled FRPP blower rated at 550 flywheel hp. Both kits are model specific, so if you have a Bullitt they send you a tune/airbox designed for your car based on the VIN.

 

Yes - that is what I was alluding to. With the FRPP installed by the Dealer, the Bullitt still had the 6500 redline, correct? So even with your setup, you should be able to hit a strong 6500 safely... correct?

 

Correct. I'm not sure how accurate our factory tachs are though. On my car, the tach only reads about 6300 rpm before you feel the car start to pull timing. I have been assured, however, that the limiter is set to the stock bullitt limit of 6500 rpm. I think I may have visited that altitude a total of 5 times or so, mostly by accident. You just don't need to go there on the street..... usually.

Regarding the airbox comment, as most know, the bullitt comes factory with an open filter airbox. The frpp kit for '08-'09 changes that to a closed airbox to meet CARB requirements in all 50 states. Not what I would prefer, but there was no indication prior to the kit showing up at the dealership that it would look any different than previous years which used an open set-up. Curious, since I thought the car already met CARB with the open filter?

 

I have a 2005 with a HO Vortech I shift about 64k and see 13lb of boost that is about the limit with stock internals.the rods pull right out of the piston! not looking to build a shortblock. Has any one used one of the anderson powerpipes on the vortech set up?

 

I need an engine that spins up to 64k rpms

 

The Anderson PowerPipe was just released for the 2005+ with Vortech. The kit comes with the DBX MAF for around $700 or so. They claim a 1-3 psi increase with the increased air volume going in, but I wonder if my stock internals can handle the extra boost. I'm already at 11 psi at 6400 rpm's, and you're already at 13 psi at 6400 rpm's with the HO blower, so the Anderson kit may be too much for a stock engine.

 

I was thinking the same and sorry 6,400 RPM is my shift points.The power pipe looks great! I wonder if you used the vortech meter you could get away with not having to retune? also I have heard that Vortech put a lot of time in its intake tube keeping the Idle from being affected.I have a Gen 1 lightning with a Vortech on it,I had the tubing redone and had to reclock the Mass air meter to get it to idle normal.

 

Hey what were you running on your car?

How did it blow?