max boost on pump gas?

[475HP '03 cobra]

how much boost do you think i could run on pump gas with the following setup. i would like to run a kenne bell the most but i dont know if its efficiency will allow me to run the amount of boost i want to on pump gas.

i need to be able to run it on 93 octane pump gas
saying i have a 347 stroker with a 8.5:1 compression ratio
the internals would be all forged (rods, pistons, crank) and the pistons would be dished.

if you need more info just tell me.
thanks,
PJ

[coupe]

Depends on the heads, cam, exhaust. Restrictive stuff will make for higher boost levels & heat-induced detonation. In general, I would say keep it below 15 psi and watch timing. You'll really have to just test though since they all respond differently. :nice:

[475HP '03 cobra]

yeah i wouldnt run anymore than 16 psi since its a daily driver. i probably wont be running more than 14, just depends on what i can get away with on pump gas. i run 14 on my daily driven cobra and have no probs. what supercharger do you suggest, or a turbo...i prefer superchargers for a daily driver.

[TheJeanyus]

yeah i wouldnt run anymore than 16 psi since its a daily driver. i probably wont be running more than 14, just depends on what i can get away with on pump gas. i run 14 on my daily driven cobra and have no probs. what supercharger do you suggest, or a turbo...i prefer superchargers for a daily driver.
Turbo > S/C.

On a 347 I would either go turbo or centrifugal (Novi 2000, D1SC, or S trim). It'll have plenty of grunt down low and a KB will just make it next to impossible to hook up.

[Ponygirl]

bet you aint never seen a Shelby
V8 ranger...heres a link which includes the one me and my father built http://photobucket.com/albums/c233/fordguy383/


That is cool :nice: :drool: I have a "Shelby" too :D :D :D

[TheJeanyus]

That is cool :nice: :drool: I have a "Shelby" too :D :D :D
And your Shelby is probably bigger than that Ranger. :jester:

[QWKSNKE]

yeah i wouldnt run anymore than 16 psi since its a daily driver. i probably wont be running more than 14, just depends on what i can get away with on pump gas. i run 14 on my daily driven cobra and have no probs. what supercharger do you suggest, or a turbo...i prefer superchargers for a daily driver.

yeah but you have to remember that your cobra is intercooled whereas the setup you are looking at would not be.

I would think 10-12 psi max on a 347. Really depends on your tuner though and you better use someone who knows what they are doing. Remember you don't want to go much over 525rwhp or so because you will split the block (if using a stock cast block. Start at 10 psi and see what it will put down after a tune and go from there.

I agree with jeanyus though, a centri' blower would probably work best on that application

[475HP '03 cobra]

its a CHP block, i dont know what they use but they told me their engine can support 600HP so i wasnt worried about over powering not to mention i probably wont have the money to get her to hook anyway and the whine of the KB is irresistable and thats why they got my heart. as for your input about the intercooler, no matter what setup i have it will be intercooled, i dont believe in running more than 6psi of un-intercooled boost. i really am most interested in procharger if i go centrif. and probably wouldnt do any other centrif. maker.

thanks for the help guys, i'm also having email conversations with CHP to see what they suggest.

[QWKSNKE]

KB does not make any kit for a 5.0 based mustang that is intercooled.

Just remember that CHP's rating is flywheel hp which is going to equate to high 400's to the ground

[475HP '03 cobra]

yeah, i was about that. i just find ithard to believe that you buy an engine built with better pparts from CHP but yet a stock terminator engine can support 525RWHP without a single problem not to mention thats with 14 psi of boost

plus i have a really good speed shop close by that could give me a great tune so i'm not to worried about blowing the block

and what about putting a main support system, would that be of any increase in power support?

[QWKSNKE]

some people say that the support systems do not help but i put a Canton steel girdle on my motor when I built it this time last year. I preferred the actual steel girdles over the aluminum ones that the other companies make.

By the way my 306 puts out 525rwhp @ 14 psi :D

[475HP '03 cobra]

i see your sif but could you fill me in on your motors other specs such as cam lift and compression?

[QWKSNKE]

Cam is a blower grind by AFM

lift .544/.544
duration @ .050 is 218/228
lobe separation is 112

Stock compression 9:1

[475HP '03 cobra]

what octane does your car run on, and how much lift ( hard ques becuase of all the factors) do you think i could run on a cam in the 347 with afr 185cc heads

[QWKSNKE]

I have it tuned to run on 93 octane.

Can't answer your cam question. I do recommend that you do a custom grind though

[475HP '03 cobra]

what if i went with a N/A setup 12.5:1 compression and flat top notched pistons should i still get a custom grind?

[QWKSNKE]

yep. I would. Custom grinds offer much better power than 'off the shelf cams"

http://www.flowtechinduction.com/camshaftsqanda.htm is the company to contact

[475HP '03 cobra]

well after collecting the info i think i'm going to stick with my original N/A application becuase of the cost to go blown.

my goal would be 400rwhp and the street fighter setup dyno'd at 400 flywheel hp and i am looking at the engine that is a little more juiced up

do you guys think i can make 400rwhp with afr 185cc heads, custom grind cam, edlebrock performer 5.0 upper/lower, CAI, shorty headers, O/R X-pipe, and flowmaster cat-back.

will i need to port and polish/ gasket match to get there or can i make it with just a good tune?

[QWKSNKE]

I do but you may want to use a trickflow track heat intake

[475HP '03 cobra]

funny, they always said you should stick with first instinct. i was set on the trickflow track heat but was reading afr's site and they said something about using the performer. back to the original plan.

anyway, do you think port/polish is neccesary? if i have the money i would gasket match anyway. any idea how much a gasket match or p&p cost?

[QWKSNKE]

I wouldn't do that on AFR heads. They come out of the box ported.

AND they recommend to NOT gasket match or at least my 165's did

[475HP '03 cobra]

what about porting/polishing and gasket matching the upper lower intake?

[coupe]

Gasket match where you can...it makes power.

Keep in mind I have the flat-top pistons and some sweet Eagle H-beams for a 347. Plus I can get you the rest of a stroker-kit too.
http://forums.qwiksnake.com/showthread.php?t=4714

[475HP '03 cobra]

do you guys suggest any other mods to meet that bump, or any estimates of HP if you think i'll be higher, because 400rw is just my goal i wouldnt mind making more:jester:

also any suggestions on ways to improve low end torque(besides a final drive change) becuase even if i dont make my HP goal torque is what is really gonna matter to me, any ideas on what a combo like this would make torque wise?

[QWKSNKE]

a 347 will have plenty of torque down low

[gt90stang]

Running a 306 with a KenneBell Blowzilla with 10# pulley and see 8# boost with 91 Octane. I think this about all you can push it on 91 Octane. 485 HP FW according to flow numbers datalogged. Have major problems hooking up with Nitto 275/40R17 drag radials, really have to feather the throttle :-)

YMMV, Don

[475HP '03 cobra]

see the only reason i will run N/A is becuase i dont have the money to do the blower applicationi love watching the boost guage, hearing it whine, and the challange of hooking it up in my cobra but i am not willing to sell her to fund the 347 build

[TheJeanyus]

Yeah the 347 will make plenty of low end grunt. That's the main advantage of bigger displacement. :burnout: