ok, thanks

Np :)

Pettit modifies the steering spindles to eliminate the problem. I've not noticed any changes in my steering "geometry" because of the conversion.

Yea I know Pettit touts the "no bumpsteer issues" claim... :)

If my recollection is correct, I believe pettit got their idea after Hinson's 20b subframe. I think they had some "relationship" between two regarding bump steer correction (but don't quote me on that).

I spoke to Hinson regarding 20b bump steer collection and he stated that it wasn't as good as the LS1 bump steer correction.. LOL!

Pettit does sell a bumpsteer kit. RX7 specialties did make some 20B frames for them, but not the originals, and I dont know which David has?

Pettit was actually doing their conversion before Hinson (Lane) even thought about a subframe for the 20b, but Hinson was building the LS1 subframe around the same time. Pettit cuts and rewelds the spindles to correct the bumpsteer, where Hinson uses tie rod ends to correct it. Im not sure how close Pettits is to stock but Hinsons is 0.080 off stock

as far as i know (err... last i called :) ) pettit no longer sells the modified spindles. they now offer tie rod ends that they "claim" will fix the problem. seeing as i have one of their subframes i will be needing the tie rod end kit, but im not sure how they compare to the rewelded spindles. i assume theyre easier to install??? anyway pettit "claims" no bumpsteer issues but pettit also claims that their 20b's do 550 hp with the stock twins ;) .... so i dont necessarily believe their claims :( -heath

I didn't say it... :angel:

Ohhh man, I dont know, I trust most of what Pettit says and I am sure David will retort. On the other side Jeff personally offered me the pettit version of the bump steer kit. I dont know what that means. He also told me that I should get my frame from RX7 specialties because Pettit was moving away from the 20B market.

mirabile, check page 4 - 5 and 8 - 10 of this thread re: the Pettit 550hp claim. There's a good bit of discussion about it.

does anyone know what the car dynod straight from pettit and at what boost? The thread is to long for me to find that info

I see nothing that either confirms or denies the claim of 550.

550 crankshaft hp

crank HP is believable, WHP is a bit of a stretch..

pettit claims 500 not 550, and they told me to spect 400rwhp at 10lbs of boost, they have being very strait foward with me and told me that if I wanted more hp to go with a large single turbo

i just got the upgraded tie rod ends from cam. he also told me that i will still see a slight bump steer problem. i will not be ready for them for another month so someone can test them out if they want :)

Okay, my experience on the HP side is the Pettit 3 rotor will not make 500 or 550 HP. First, Pettit's claims for HP are HP at the crank. So, if one assumes 15% loss to the wheels, then the WHP would be 425 - 468.

The best I ever did with the twin turbo setup was a little under 400 WHP. This result remained consistent whether I tried 10 lbs. of boost or something higher. Why? Because the twins (at least on my car) wouldn't hold more than 10 lbs. of boost no matter what I (or Pettit) tried. The twins run out of air at about the 5,500 RPM mark. Car pulls like a son of a bitch until this level and then just can't do any better. Remember, the torque of a 3 rotor is much better than a 2 rotor so it's still a very fun ride, even with this issue.

Pettit always claimed the twins should hold up to 15 lbs. of boost but they never did on my car, even after swapping out the original twins installed by Pettit with a brand new, balanced and ceramic coated unit sent to me by Pettit. My ultimate solution was to take out the twins and go the single turbo route. You see where that go me - two years of misery and lots of dollars:) Hopefully it's about to be worth it.

Interesting. I hate to bring this up after this terrible experience, but are you considering a single turbo, or larger twins?

Is this directed to me? If so, read back through the posts. I'm installing a GT51R (Australian version) single. Hence the problems at Wold USA and the car now at Gotham.

If not me, the twins work fine. They just can't product over 400 WHP. It's still a blast with the increased torque. My problem was I always wanted more than this anyway so I should have gone single to begin with. Would have saved about $15,000 - it's only money, right?

Well, if ever start giving it away, please keep me in your thoughts :)

Thats what Im looking for right now, close to 400 rwhp

And the reason your turbos stop making power at 5,500 rpm is because your engine is ported, if the engine is not ported the turbos will make power up to 6,700 rpm depending on set up

Then you don't read too well :p: There's PLENTY of info to show that 550 hp is not only unrealistic, but that it's never been attained. This includes (but is not limited to) theoretical maximum power levels of the twin turbos, and actual world experience (as David Hayes has mentioned already).

You're incorrect. Pettit has - for YEARS - advertised 550hp. Just b/c it's no longer on the website doesn't mean it didn't happen ;) In fact, allow me to show ya what used to be pasted on their website for YEARS...

"Pettit Racing in Fort Lauderdale, FL, has created the Banzai RX-7. Dispatching the quarter mile in a scant 11.4 seconds at over 126 mph, a driver is just at the first half of the Banzai's performance envelope: top speed is estimated at 240 mph. The brainchild behind the flawless conversion is veteran racer, Cameron Worth. Worth has a long record of racing rotary cars that dates back to the seventies, so it seems fitting that he transfer that knowledge to create a street-legal "Road Warrior" - as he calls it - capable of blowing the doors off supercars costing nearly twice as much. He does it with a turbocharged, 3-rotor conversion.

Under the hood, it seems less cluttered than its two-rotor counterpart. Fitting nicely, everything looks as if it is the way the engineers in Japan had originally intended it. Perhaps what is so impressive about the car is its civility. It can be idled around town, yet it can be rocketed down the on-ramp with a ferocity that words simply cannot explain; it must be felt to be believed.

Everything about the conversion is state-of-the-art. The craftsmanship, down to the self-locking nuts and liberally appointed hiem-joints, is testimony to its racing heritage. Its character is reminiscent of the finely tuned Alpinas, Hartages, and other high-performance gray-market cars that made it in the window of opportunity left open by sleeping legislators. But the spec box only tells half the story.

The other half comes from the Banzai experience that Worth is gladly willing to share with serious buyers who fly into Fort Lauderdale International Airport. For those power junkies who never seem to be able to get enough power, brakes, or handling, Pettit Racing's ride back to the shop will be burned into memory forever. Try it; it's a ride well worth the plane ticket.

3 Rotors
2 Sequential Turbochargers
2.0 Liters
550 HP @ 7500 RPM
460 Lb-Ft @ 5500 RPM

to propel

2735 Pounds of Canyon-Carving, Freeway-Dissecting, Corner-Chomping, Pop-Your-Eyeballs-Out-Braking, Two-Seat-Heaven RX-7

The Banzai Edition RX-7 utilizes a 20B three rotor twin turbocharged engine which produces 550 Hp, propelling the Banzai to light speed in a flash. The Banzai is fitted with a huge custom built front mount intercooler, hi flow radiator, and retro fit air conditioning condenser to handle the extra cooling needs. A special computer-designed sub frame fits the 20B power plant perfectly into the RX-7 engine bay and allows easy access to all components for service. A custom Digital Management System provides unsurpassed drive ability and unbelievable performance without all of the spaghetti wiring of the factory system. A TKT Stainless Steel Exhaust System gives it the perfect note. Special Trak-Pro suspension and brake systems handle the extra performance with ease. Power is transferred to the ground via Bridgestone Potenza S-02 225/40ZR18 front and 285/35ZR18 rear tires mounted on beautiful 18" x 8.5" front and 18" x 10" rear Forgeline LS web design wheels.

Pettit Racing's products have established a firm foothold in the RX-7 performance and accessory market for the average RX-7 owner as well as the true enthusiast. In order to maintain our position as an industry leader, Pettit Racing actively competes in professional road and drag racing. Since 1980, Pettit Racing has won 5 road racing championships, set several track records, and competed in countless drag races. Our quickest quarter mile has been 10.855 seconds. In the 1996 Rolex 24 Hours of Daytona, our car competed in the world class event on DOT street tires, finishing a respectable 11th place in the S2 class and more recently took 3rd place in the S2 class at the Sebring sports car race in October 1997. Pettit's 3rd gen RX-7 finished in 5th place in the S2 class at the 1998 Rolex 24 Hours of Daytona For more information, or to place an order, please call (954) 563-6064."

Now, having said that, I don't want anyone misinterpreting my post. I have nothing but the utmost respect for Pettit. In fact, I met Cam a few years back, and he was very kind, very down to earth, and an all around nice guy. Plus he said he loved my FD :D So yea...this isn't a negative post; rather just a critical comment about Pettit's claims for the Banzai.

Porting only shifts max power higher up in the powerband; it won't help the turbos make more power than they are actually capable of. In this case (the Banzai), the turbos reach maximum efficiency (according to you) at 6,700 rpm. So porting will simply help the turbos reach maximum efficiency faster (ie lower in the powerband), but won't yield more power out of them, since they're maxed out as it is. Keep in mind of the turbines is actually SMALLER than the FD's twins, and the other is the same size. So it's inevitable that the 20B twins will make LESS power than the stock FD twins. Couple this w/ the fact that the Stage III BNRs have made a maximum of 425rwhp (and in this case the engine was NOT the limiting factor; rather, it was poorly designed - aka not high flowing - runners of the twins, and a restrictive exhaust manifold) that limit the twins from making more power. So 500hp on the 20B twins is a LOOOONG shot. mirabile, that convincing enough for ya? ;)

~Ramy

Based on how fast you respond to emails, I read way faster then you Ramy. :molepoke:
When studying law you learn to look for facts.

I see no dyno sheets, just speculation on whether it is in fact possible.

David's experience is the closest thing I see to fact.

I am trying to attain dyno sheets from one of the Pettit 3 rotors.

I will report back.

Woooooooweeee! I just got :powned: LOL. Nice one ;)

I understand all that, but when studying law, you can't use the LACK of evidence as support that it COULD exist hehe ;) Pettit has no dyno sheets proving 550hp, and physics says those turbos won't support anywhere *near* 550hp. That's wayy past circumstantial my friend :)

~Ramy