If you're just getting into it, the supercharger is best. If you're more hard core and know how to tune and all that, a turbo is best.

 

Well Dan, i commend you for responding. Considering the 80% support for the yes vote you gotta assume more people would like to see a little more real r&d results (which is what i was offering). I do offer my compliment (and so should others) for providing a product for a declining market. I know you've been bashed about not updating (twisted rotors, etc) but I guess if you only sell a few each year compared to the rebuilding business, than that would explain it. I have stated what application the blower works well for. And, you site has never mislead anyone on real expectations from the charger. The unfortunate thing is some buyers have bigger hopes. I wish you the best with your business, you were always honest and fair with me.

 

Where can I buy pullys for my supercharger?
Do I have to order them?

 

Its too bad you cant get a gilmer setup for it. Anyway Im still keeping up on this thread. Nice chatting with you Dan at SS this year. It was Sterling and I who were hitting you up about the camden.

 

Atkins (aka camden) has the pulleys. Give 'em a call, fair price and quick delivery.

 

yeah as if getting ahold of anyone at atkins is even a possibility.
Ive emailed them for pullies like 3 times
Ive called there and the voicemail is full...
How the hell does a guy get ahold of some pullies!

 

Call 1 253 848 7776. I have always been able to get a hold of Andy or Dan and found their service prompt and courteous.

 

John There is allways a PM here on the boards too..

Just send me a PM on what pulleys you need and we can go from there...

Dan

 

Well, I pm'ed Dan with the option of contributing to an extensive dyno pull consisting of testing a variety of factors (various pulleys, etc) so we'll see what they wanna do to demonstrate to all of you the full potential of the camden as I feel there is still much more to be had than where I am currently at.

 

Subscribed!

 

Hmmf.

Still no dyno pulls......

How and the crap am I gonna know what to buy?

Oh well.......guess ill have to do it myself one of these days.

 

Ahhhh, news flash.......I blew up the motor with some distributor advance experimentation. Dyno pull will happen for certain though! I did get feedback from Dan Atkins though, he already has plenty of dyno results. Bottom line: turbo=more power, camden=simple, effective, torquey, honest 30+hp gain but that's the limit. For those who want to bash the camden and atkins for not furthering development you have to realize that they only sell 10-20 units/year. This is not a big part of their business, so to make improvements by developing a twisted 3 lobe rotor for instance would not even make break even against profit for several years. Soooo, it does what it promises and for those who have them we are grateful that Atkins continues to build and offer this product.

 

And here is the pre-catastrophic failure teaser.. http://media.putfile.com/blown-rx7-compilation

 

I believe a couple of these runs were with broken apex seals. In total, I destroyed 4 apex seals, 1 rotor (dented it!) and 2 housings. But it sure screamed before that happened.

 

I thought it was a 30% gain. I guess if your engine started out with 100HP, like a stock 12A, 30% would be 30HP. Makes sense now.

 

Duuuuh yep, I meant to type %

 

A camden only gives a 30% gain ?

Hardly seems worth it... I mean on a stock engine you get 20% out of a RB Exhaust...

Still, I've always wanted one of these... Maybe one of these days I'll get around to it. I'm still planning to do a crazy 12a N/A build up first.

Jon

 

Jon, they're very pleasant to drive. They're worth it just for that because the alternative is a 3 rotor.

 

Its not a fast as hell kind of unit, it is an all around fun driving.
I'll be honest I was alittle dissapointed by the hp #'s given for a supercharged 12a but driving it is so much fun and it feels so responsive at any rpm. Makes for a great driving car.

 

Exactly! The point I was making is the only alternative way to get that kind of all around driveability and responsiveness is to spend bigger bucks on a 3 rotor of some sort, either 12A based (17A) like that Hurley package with the three SU carbs and side ports, or a real 20B with EFI. Boost is optional of course as the three rotors fill in the gaps in the lower RPM that a 2 rotor normally has, whether boosted or not. They're also even more responsive without a turbo corking up the exhaust.

Anyway if you want the power of a 3 rotor without the associated costs and fitment issues, a supercharger is the only way to go. If however you're looking for bragging rights for high HP numbers and less driveabilty down low, then by all means go turbo. I'm not saying they're good or bad, I'm simply saying an SC is more pleasant to drive than an NA or turbo 2 rotor because the extra power is there as soon as you flex your ankle. No waiting for the RPMs to climb before you start feeling something.

 

I'm curious how adaptable it would be to a GSL-SE setup, too. For 8 psi, you're looking at 1.5 atmospheres, minus the heating losses. Would you just bump up the pressure or oversize the injectors and stick with the stock ECU, or would you need S4 manifolds with secondary injectors that fire in parallel with the stockers, and you only ground the secondaries when you're on the boost?

Is there a bypass circuit in the supercharger like I'm used to seeing on Kenne Bell?

 

Switch to a carb

[/QUOTE]Is there a bypass circuit in the supercharger like I'm used to seeing on Kenne Bell?[/QUOTE]

Nope, as mentioned earlier atkins does not sell enough to invest in the R&D to bring it up to date

 

It is possible to see more than 30% increases. My buddies 12a (now John's) ran 150 hp on a dynojet. My original 13b ran 158 rwhp on a mustang dyno. Codeblue's 13b ran 210hp on a mustang dyno. I hope to see the 200 mark now that I have things dialed in better, particularly the exhaust. My first dyno pull included an exhaust with 2 presilencers and a muffler. So in each of these cases, the camden actually gave in increase of about 50-80% over stock, or 35-50% over a streetported n/a equivalent with exhaust upgrades......a 13b fb will walk away from a stock TII in 60 feet and the TII will catch it after the 1/8 mile. Not bad for a bolt on.

 

The hp numbers dont speak for the ride feel.

 

I went for a ride in the supercharged 510 today and it really gets up and moves. -10 pulley, 5" SC, aluminum flywheel, 2200 pound car (2500 with us in it) and a basic street port on a set of Y plates and '74 rotor housings with '86-'88 NA rotors (9.4CR). We estimate it has 190-195 HP which is 30% over an estimated 150HP in NA mode. I think I got the math correct. It accelerates like an FD with healthy stock twins which dynoed 205HP at the wheels recently.

I'd say 190ish is probably fairly accurate, but then again he still needs to dyno the 510 so we'll see. The actual HP numbers will probably be less, but it certainly feels like a lot. John Smack knows what I'm talking about.