How much boost will a stock bottom end hold? - Page 3

93cobra1928 · 02-19-2010, 08:20 PM

Quote:

Originally Posted by QWKSNKE

qkjuiced is right.

If you look in my thread "History of the 93" you can see my combo at 14psi

Stock intake, stock t/b, AFM blower cam, AFR 165 heads

Yeah I read that earlier, I should be close to that.

Quote:

Originally Posted by qkjuicedpony

An S trim at 12-14psi will probably get you close to 480-490 rwhp with your current combo. If you went turbo I would change the cam for sure.

I was thinking the X-303 had too much overlap for a turbo

A Garret T04 V1 should get me where I need....I guess

EHardy1971 · 02-19-2010, 08:24 PM

Quote:

Originally Posted by QWKSNKE

My block didn't crack under boost. The motor was inspected and freshened up when the blower came off the car. It cracked at some point and time on the last combination

I agree with qkjuiced. Keep it around 500 rwhp, good tune, and it will live.

Ok, my mistake!

qkjuicedpony · 02-19-2010, 08:30 PM

Quote:

Originally Posted by EHardy1971

Ok, my mistake!

Yeah STFU Eric

EHardy1971 · 02-19-2010, 08:33 PM

Quote:

Originally Posted by qkjuicedpony

Yeah STFU Eric

Dale McPeters · 02-20-2010, 09:58 PM

Quote:

Originally Posted by 93cobra1928

I was thinking the X-303 had too much overlap for a turbo

Yep to much overlap for a turbo IMHO.

If you can swing the extra cost just buy an after market block and be done with it. Once you get the first one built and get used to the power you will want more......and with a turbo it is way to easy to turn the boost up.

I had three cracked late model 5.0 blocks in my shop at one time....
I now have a Dart SHP on the engine stand to take their place.

93cobra1928 · 02-21-2010, 07:14 AM

Dale I wish i could afford an aftermarket block right now!

If I can piece together a turbo setup I will be keeping it around the 450rwhp mark and doubt I will turn it past 6000rpm.

As far as the cam goes I will either go with an Anderson or similar turbo grind or put the factory cobra cam back in.

qkjuicedpony · 02-21-2010, 08:06 AM

Just tuned a car yesterday...Stock short block with either a f or x cam(never verified) performer rpm heads,cobra intake and S-trim at 14psi with a water/meth kit

Made 526rwhp through a c4 trans after finished...No chips or tuners used either and drives like a stock car too

93cobra1928 · 02-21-2010, 08:14 AM

Nice numbers. I would think it was the F cam considering the idle quality is really good on that cam. The X, which I have, has a rough idle with the amount of overlap it has.

93cobra1928 · 02-21-2010, 08:32 AM

I just looked up the specs on both cams and there is only 2* difference in the overlap so I guess my thinking is WAY flawed on that!

TurboPete · 02-21-2010, 03:47 PM

This is a interesting topic b/c Im beginning to put together my fox body build .
I also heard that the main issue obviously was the upper valley that splits down the middle , so I bought the Valley girdle and main girdle.
The block is a stock block with FRPP crank , Eagle forged I beam rods and Forged Arias TW pistons. I got a sweet deal on a Cam motion custom Turbo Cam from a buddy of mine who aborted a Turbo build , but the cam is a bit aggressive but thats ok I can re-use it later when I build a Dart Block. For now Ill use it in the 306 we re-built.
Heads are TW CNC 185cc , and a Victor Jr upper Intake manifold .
This will be a Turbo Car with a Precision Billet 67mm or maybe a 71mm turbo .
Ive been told rpm is what kills them so Im hoping to push at least 16 psi's on c16 thru a c4 and turn the motor 5600 to 5800 no more then that .
Not sure what it will make but Im guessing somewhere around 530 to 550.
I have a very good friend of mine that ran a bone stock shortblock with afr heads , cam and TW Intake with a Masterpower 70mm for almost 2 years , and only runs c16 and buzzes the motor around 5600 car ran 10.06 @ 134.00 thru a c4 .

http://www.youtube.com/watch?v=OEFjM...eature=related

Pete

02-21-2010, 07:14 AM	#26
93cobra1928 Dazed and Confused Join Date: Mar 2009 Location: Northport, Al Posts: 778	Dale I wish i could afford an aftermarket block right now! If I can piece together a turbo setup I will be keeping it around the 450rwhp mark and doubt I will turn it past 6000rpm. As far as the cam goes I will either go with an Anderson or similar turbo grind or put the factory cobra cam back in. __________________ Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards

02-21-2010, 08:06 AM	#27
qkjuicedpony Dayuuuuuuum!!!!! Join Date: Dec 2004 Location: Dallas GA Posts: 2,933	Just tuned a car yesterday...Stock short block with either a f or x cam(never verified) performer rpm heads,cobra intake and S-trim at 14psi with a water/meth kit Made 526rwhp through a c4 trans after finished...No chips or tuners used either and drives like a stock car too __________________ 86 Mustang Gt......Mods piling up in my garage. 07 F350 dooly.....Tows my fifth wheel

02-21-2010, 08:14 AM	#28
93cobra1928 Dazed and Confused Join Date: Mar 2009 Location: Northport, Al Posts: 778	Nice numbers. I would think it was the F cam considering the idle quality is really good on that cam. The X, which I have, has a rough idle with the amount of overlap it has. __________________ Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards

02-21-2010, 08:32 AM	#29
93cobra1928 Dazed and Confused Join Date: Mar 2009 Location: Northport, Al Posts: 778	I just looked up the specs on both cams and there is only 2* difference in the overlap so I guess my thinking is WAY flawed on that! __________________ Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards

02-21-2010, 03:47 PM	#30
TurboPete Member Join Date: Aug 2009 Posts: 48	This is a interesting topic b/c Im beginning to put together my fox body build . I also heard that the main issue obviously was the upper valley that splits down the middle , so I bought the Valley girdle and main girdle. The block is a stock block with FRPP crank , Eagle forged I beam rods and Forged Arias TW pistons. I got a sweet deal on a Cam motion custom Turbo Cam from a buddy of mine who aborted a Turbo build , but the cam is a bit aggressive but thats ok I can re-use it later when I build a Dart Block. For now Ill use it in the 306 we re-built. Heads are TW CNC 185cc , and a Victor Jr upper Intake manifold . This will be a Turbo Car with a Precision Billet 67mm or maybe a 71mm turbo . Ive been told rpm is what kills them so Im hoping to push at least 16 psi's on c16 thru a c4 and turn the motor 5600 to 5800 no more then that . Not sure what it will make but Im guessing somewhere around 530 to 550. I have a very good friend of mine that ran a bone stock shortblock with afr heads , cam and TW Intake with a Masterpower 70mm for almost 2 years , and only runs c16 and buzzes the motor around 5600 car ran 10.06 @ 134.00 thru a c4 . http://www.youtube.com/watch?v=OEFjM...eature=related Pete __________________ 2007 Hellion Turbo Mustang GT , Precision powered 78mm , Lethal Return Fuel System, C&L Intake , Steeda Adj Suspension. Built motor , Stock Heads and Cam. ATF Stage 4 4r70w Tranny , 20" Custom Forged Vossen Wheels. Tuned by Paul Meister @ Torq. 89 Fox Body 14k original miles lots of goodies!