Cam And Rpms??

j l smith · Dec 28, 2017

I have a 1993 302 gt 40x heads ported 1.7 roller rockers b303 cam trick flow track heat intake and the car seems to fall off at around 5200 rpms is that the cam any info would be appreciated

General karthief · Dec 28, 2017

I doubt it's the cam but? Need more info, trans type, running fuel pressure? Any codes?

a91what · Dec 28, 2017

Basic specs say good to 6k rpm. But that depends on how it was installed and other factors. Factory tach is usually off by a few hundred rpm.

CarMichael Angelo · Dec 28, 2017

karthief said:
I doubt it's the cam but? Need more info, trans type, running fuel pressure? Any codes?

I think you're just like jrichker...

He has all his tech answers saved as a quick reference that he can simply link to should the situation call for it.

In your case: "Need more info, trans type, running fuel pressure? Any codes?"
I call the above your Karthief white paper...
And....
What does the transmission have to do with the engine nosing over at 5200 RPM?

Mustang5L5 · Dec 28, 2017

I've driven a GT40P combo with a b303 cam and can remember that combo would love to rev to the moon.

How was the cam installed? Straight up or advanced?

There's so much it could be that most of these will be guesses.

JD1964 · Dec 28, 2017

What MAF are you running? If you are running the stock MAF its 55mm and that could easily limit top end rpm

General karthief · Dec 28, 2017

madmike1157 said:
I think you're just like jrichker...

He has all his tech answers saved as a quick reference that he can simply link to should the situation call for it.

In your case: "Need more info, trans type, running fuel pressure? Any codes?"
I call the above your Karthief white paper...
And....
What does the transmission have to do with the engine nosing over at 5200 RPM?

Alas, to use my name in the same sentence as jrichker raises my ego far above my abilities, I felt the need for more info to give the more experienced (like yourself) a better chance to offer good advice.
And I have no idea if/how a transmission would effect his problem, if I knew it would cause you to respond I would ask more often

mikestang63 · Dec 28, 2017

what fuel pump are you running
what isyour fuel pressure
where is your timing set at
how many degrees of total timing do you have

Bullitt347 · Dec 28, 2017

What color is the car? Leather or cloth seats? Premium stereo or just an am/fm?

General karthief · Dec 28, 2017

Transmission man, must know about the transmission!
And, and beer! What beer do you swill?
I hope I haven't scared him off, we just want to help.

j l smith · Dec 28, 2017

aod tran 3500 edge racing non lock up converter 373 gear and no I don't have it tuned yet and skock injectors and pump im getting ready to put a 340lph pump in and 30# injectors and 75mm t/b 80mm mass air im just rounding up part now I have the pump so I still need injectors mass air and throttle body oh and the car is black hahaha

Mustang5L5 · Dec 28, 2017

You might be starving for fuel at the upper rpms. Any way to borrow and put a fuel gauge on the car and stick it under the wiper and see?

mikestang63 · Dec 28, 2017

Mustang5L5 said:
You might be starving for fuel at the upper rpms. Any way to borrow and put a fuel gauge on the car and stick it under the wiper and see?

see my post above asking what fuel pump what his fuel pressure is

a91what · Dec 28, 2017

That's a lot of pomp and injector for that set up. The injectors you can probably get away with but the pump is way too big will be recirculating fuel and it'll get hotter and hotter. I suggest a walbro GSS 225 pump

95BlueStallion · Dec 28, 2017

j l smith said:
aod tran 3500 edge racing non lock up converter 373 gear and no I don't have it tuned yet and skock injectors and pump im getting ready to put a 340lph pump in and 30# injectors and 75mm t/b 80mm mass air im just rounding up part now I have the pump so I still need injectors mass air and throttle body oh and the car is black hahaha

When I read up on pumps, I chose a 190 lph for my 347. You shouldnt go any bigger than that. If you havent installed the giant pump, I would sell it or return it and get a Walbro 190.

cleanLX · Dec 29, 2017

Not the the B cam is know for aggressive lobes, but, I'm wondering what valve springs you are running?
float/bounce?
I believe the Bcam wants ~120lbs seat ~295lbs open...
I think the original/older GT40x heads typically have 80-90lbs on the seat, and doubt that relates to 295 open.
I would pull a spring and check it out before I went much further down the rabbit hole.

FastDriver · Dec 29, 2017

I wonder what the OP means when he says it's falling off. Yeah, I think drop off beyond 5200 should be expected.

But, if it is falling off more quickly than it should, I agree then the injectors and pump are likely candidates.

General karthief · Dec 29, 2017

And springs
The color of the car might be suspect also

a91what · Dec 29, 2017

You may be drinking the wrong alcoholic beverage... maybe..

j l smith · Dec 29, 2017

my springs are 135lb I just had the heads redone and im not sure about the fuel pressure I haven't check it

Cam And Rpms??

j l smith

Member

General karthief

wonder how much it would cost to ship you a pair

a91what

SendMeUrDataLog

CarMichael Angelo

my rearend will smell so minty fresh,

Mustang5L5

That is…until I whipped out my Bissell

JD1964

there is enough sticking out to grab on to

General karthief

wonder how much it would cost to ship you a pair

mikestang63

Bullitt347

I have been doing it wrong this whole time

General karthief

wonder how much it would cost to ship you a pair

j l smith

Member

Mustang5L5

That is…until I whipped out my Bissell

mikestang63

a91what

SendMeUrDataLog

95BlueStallion

My assy trans to myself

cleanLX

FastDriver

I was uncomfortably high & wearing a helmet

General karthief

wonder how much it would cost to ship you a pair

a91what

SendMeUrDataLog

j l smith

Member

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Cam And Rpms??

Member

wonder how much it would cost to ship you a pair

SendMeUrDataLog

my rearend will smell so minty fresh,

That is…until I whipped out my Bissell

there is enough sticking out to grab on to

wonder how much it would cost to ship you a pair

I have been doing it wrong this whole time

wonder how much it would cost to ship you a pair

Member

That is…until I whipped out my Bissell

SendMeUrDataLog

My assy trans to myself

I was uncomfortably high & wearing a helmet

wonder how much it would cost to ship you a pair

SendMeUrDataLog

Member

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