Another PC carb story

[10secgoal]

The sticky is gone, so I thought I'd throw this up so maybe newbies find out also.
Just dynoed a 65 fastback with a 349 and a T-70. The car shot ducks on the dyno bad, ended up pulling 8 jet out front and rear to get it to stop. Still wouldn't read on the dyno. Pull the carb back apart and pul out 2 PV's. Now this is a stock block car pushin 10 psi. And was pushing 10 psi before with a blower. It was even taken to PC with the blower and they couldn't fix it. Both the front and rear PVCR's were drilled to over 5/16, and jetted pretty high. I blocked the back completely, and lowered the front to .059's and threw a 10 pt spread back in it. Re-dynoed and it would start out ok, then dive into oblivion. The clutch started to die at about 4k, then the A/F would start to rise. But this thing has HUGE annulars in it. When the clutch is upgraded I'll probably try a proform main body on it. Shitty part is he could have modded a holley carb himself and been much closer to a decent tune right off the bat with Hangar 18 stuff, than the junk he bought for 900 bucks. I really don't know the HP level PC was shooting for, but it was two high. Funnier yet is the jet's had extensions, but the rear PV did not.  Not everybody knows about them yet I guess. Unfortunetly he said the only reason he didn't go with CSU, is these guys were local to him.
If I didn't know any better, I would have thought it was set up for alky.

[onenastynotch]

had a similar problem with a blow thru carb from them 5 years ago.......put a stock 750 on it with some help from pat at prosystems and its mint up to 12 psi........if u doin it from scratch csu is the way

[Iskwezm]

Its my car that was the duck hunter.Im not gonna bad mouth PC yet, but have contacted them to see what they will do for me.I got their stage 3 blow through and THOUGHT it was what i needed back when i had the Paxton.If they dont want to help me..........then ill bad mouth

couple of dyno vids
 dyno run, 65 fastback

dyno runon my turbo stroker

[OLDHEAD]

You are doing alot better then my friends blowthru PC carb.His melted down on the second run at the track..rebuilt it and lost it again on the first dyno pull....OLDHEAD

[Iskwezm]

Actually I remember my buddy has a SEMA big block chevelle with a procharger and a PC carb.He never got his to run right either

[Iskwezm]

Ok, like I said, I wouldnt bad mouth them until i got a response and here it is

Message: Hello Ron/Eddie,
> > I purchased on of your poweder coated blow through carbs a little over a
> > year and a half ago.Its on a 65 orange Mustang fastback that you have a
> > big pic of on your wall.When i bought it it was for a Paxton blower but i
> > have since went to a T-70 turbo.You TRIED to get the carb to lean out in
> > your shop by putting a rear power valve but was unable to really get it do
> > anything, becasue you said the cam was wrong(108LS).The engine has been
> > gone through again (3rd time)by FPS with a custom turbo cam.Well i FINALLY
> > was able to get it on a dyno after all the problems with FPS and this
> > thing was super rich(below 10.0) We ended up blocking off the rear
> > P/V,lowering the front P/V and taking 5 jest out front and rear, and
> > slightly openeing the air bleeds.Both PVCR\'s were 5/16 so they were
> > reduced to .059\"(fron only).Before it wouldnt even register a A/F, now
> > this thing is still rich at 10.8 and drops to under 10.Im confident my guy
> > can tune a carb since he done many trubo set ups on \"out of the box\"
> > Holleys.Im really dissapointed in that I spent about $850 on carb and
> > about $600 on a fuel system with you guys on to have have him tell me this
> > carb will never run right becasue its modified too much for my \"simple \"
> > setup.I was only looking for 500-550 RWHP and after 7 hours on the dyno to
> > get where it would read a A/F i couldnt afford more dyno time(made
> > (404/392).So its still suprer rich and drops even more durring the dyno
> > pull.Do you have suggestions what I can do other then go to a stock Holley
> > and start all over??????theres videos on streetfire.net.Just put in
> > fastback or turbo,youll recognize the car.



Thanks for your response.

Mario

> From: support@performancecarburetors.com
> To: 1mario65@msn.com
> Subject: Re: Contact Request
> Date: Tue, 1 Apr 2008 09:02:36 -0700
>
> Mario Lets clear the air on a few things ! First we built that carb. for you
> over two years ago possible three years because we do not even have you
> listed in our computer carburetor files . Second thing is the fact that from
> the time we built the carburetor to your engine specs. you had a problem of
> it running LEAN not rich because of improper camshaft specs. for a blow-thru
> engine and a inadequate fuel system . We worked with you on all those
> problems changing the carburetor twice at your request , the second time on
> your car at our shop at no charge to you . Now what you should have done was
> contact us before going to the dyno , telling us about your new engine /
> turbo combo and we would have changed the calibration of your carburetor at
> a cost of 125.00 , thats what we charge for recalibration of one our
> carburetors . We will still be happy to change the calibration of the
> carburetor at anytime . PC.
> ----- Original Message -----
> From: <1mario65@msn.com>
> To: <support@performancecarburetors.com>
> Sent: Monday, March 31, 2008 11:03 AM
> Subject: Contact Request

I still have a written reciept, so I doubt you ever enetered anything in your computer.It was never lean, it was so rich it burned your eyes and that was at your shop too.The lean condition that WE thought it had was not even lean, but i bought a PE pump kit anyway. I bought from you based in a freinds recommendation(Jeff Beggs), when i was told to go with other competitors brands by other people.The only thing i remember you doing was changing the rear metering block for a "band aid" at your shop, which i appreciate, but really didnt help the situtation.You NEVER replaced the carb nor offered that as a resuloution for my problem.I realize it has been maybe 2 years, but the car ran so bad i gave up on it and it sat for 10 months out of last year.I do A LOT of shows and media events with this car and to have your product on my car and say good things about, will probably not happen anymore. Financially i WILL NOT pay to have it recalibtrated again at this point in time.


thanks for your response,

Mario

[Heath]

I was told yesterday that PC was no longer going to do blow thru stuff??? The source seemed really dependable and honest so hmmmm.  Well I hope they work it out with you but if not give me a shout and I will see what we can do for ya....  If anyone else knows if this is true please let me know...  Im gonna try and call them (PC) but it wont be until later we have alot to get done before the weekend......

[Iskwezm]

In not going to deal with them or let do anything to the carb. i spent enough with them already.

[boosted67]

I know of a PC (perfromance Carb Ontario CA?) carb that ran on a dyno to 700HP, no problems. 383 SBC hydrualic roller with a small vortech. Drivibilty is fine. Not defending them in anyway. Just crazy what you guys post. I have one from a used blower purchase. I wonder if mine is junk or will run on the dyno?

[Iskwezm]

Well like I said in my post, I wasn’t going to talk crap on them till I got my response, but after I got it and either Ron or Eddy said they TRIED to resolve my issues by swapping carbs, that is a total lie since mine was powder coated and they don’t stock custom carbs. I am really disappointed in the final product and the final service I got and I WILL make it known at every event I do.

[PrecisionTurboMustang]

Sounds like another company that has been a hot topic lately.