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General Tech => Turbos => Topic started by: GrimLX on July 15, 2012, 01:29:16 pm



Title: Stock vs F303
Post by: GrimLX on July 15, 2012, 01:29:16 pm
I am ASSembling a guinea pig engine out of some parts I already own for my turbo project. Here is the list:


302 Roller block and rotating assembly
GT40 Heads
Weiand 7515 intake
Blow-thru
76mm turbo
1.6 Crane rockers

3000lb car
C4
Transbrake
3100ish converter flash
3.27-3.55 gear

I have both the stock HO camshaft and a F303. I havent purchased springs yet. More strip than street anymore.

Which would you use? Im leaning towards the stocker, but wanted some opinions.

Thanks




Title: Re: Stock vs F303
Post by: Joel5.0 on July 15, 2012, 06:46:39 pm
Stocker w/1.72 rockers and upgrades valve springs.


Title: Re: Stock vs F303
Post by: nealysa on July 15, 2012, 06:49:30 pm
You can make more than enough power with the stock cam to split the stock block.  You're turbo will be on the big or laggy side for a mostly stock 302, but it should be fun when it's all together.


Title: Re: Stock vs F303
Post by: mighty mouse on July 16, 2012, 10:29:57 am
If you already own the F cam, and you will not be tearing the engine apart to install it, I would run the F cam.

If you have to buy the F cam, or do a bunch of work to install it, use the stocker with some 1.7 rockers.

That turbo is going to need some help getting it to spool with that small of a head.


Title: Re: Stock vs F303
Post by: GrimLX on July 16, 2012, 12:44:07 pm
I already own both camshafts. I will be using the dog-bone style lifter also.

Performance with this engine isnt a "huge" deal, as its more to get the turbo/blow-thru sorted before using my good junk. I would like for it to run fair, but it is what it is.

I went with the GT40 stuff so if something does let go, Im not out anything.

It would be easier to run a Super Victor like the kit is made for, but I dont think that would work too well.





If you already own the F cam, and you will not be tearing the engine apart to install it, I would run the F cam.

If you have to buy the F cam, or do a bunch of work to install it, use the stocker with some 1.7 rockers.

That turbo is going to need some help getting it to spool with that small of a head.


Title: Re: Stock vs F303
Post by: Outlaw Bill on July 16, 2012, 04:45:20 pm
F-303 will need better valve springs for sure.  I have seen one peak at 5700 rpms with GT-40 heads and Cobra intake/75mm throttle body. I believe it made near 280-285 rwhp.


Title: Re: Stock vs F303
Post by: jayh on July 16, 2012, 05:21:40 pm
Id run the F303 no doubt about it. my$.02


Title: Re: Stock vs F303
Post by: GrimLX on July 16, 2012, 08:03:04 pm
What would you guys thing of the F cam with a Super Victor intake? I doubt it would be ideal, but if I used one I could bolt the turbo kit straight on without any modifications. Camshaft will be degreed and the carburetor will be from C&S for either pump gas or E85. Im tempted to use my Dart block and good parts rather than doing this whole mismatch operation, but Im afraid Ill hurt something.



Title: Re: Stock vs F303
Post by: GrimLX on July 16, 2012, 08:03:50 pm
I forgot to mention; thanks for all replies


Title: Re: Stock vs F303
Post by: Outlaw Bill on July 16, 2012, 08:12:19 pm
What would you guys thing of the F cam with a Super Victor intake? I doubt it would be ideal, but if I used one I could bolt the turbo kit straight on without any modifications. Camshaft will be degreed and the carburetor will be from C&S for either pump gas or E85. Im tempted to use my Dart block and good parts rather than doing this whole mismatch operation, but Im afraid Ill hurt something.


The super victor is way too big!. The victor jr intake is plenty for a GT-40 head.


Title: Re: Stock vs F303
Post by: jayh on July 16, 2012, 08:28:39 pm
theres a guy somewhere on the internet that used to have tfs 170's, ported 7515 and f303 and made 1000. his name is trent I think. blow through deal


Title: Re: Stock vs F303
Post by: Bossman on July 16, 2012, 10:23:32 pm
theres a guy somewhere on the internet that used to have tfs 170's, ported 7515 and f303 and made 1000. his name is trent I think. blow through deal

Brian over at theturboforums.com
He did that quite awhile ago.    Aftermarket block 306. 
Once you go turbo, IMO the need for badass custom billet roller cams is likely not ultimately needed except for people doing high end racing. 
Find the " when will it grenade" thread  and you'll shit at what can be accomplished with very very stock parts and a turbo. 
Locally we had a guy do 600+hp with an F-cam and GT-40 top end and stock bottom.  Good fuel goes a long ways.   


Title: Re: Stock vs F303
Post by: mighty mouse on July 17, 2012, 07:45:36 am
Run the 7515 and a spacer...


Title: Re: Stock vs F303
Post by: juiced coupe on July 17, 2012, 08:59:01 am
I would lean towards the stock cam, based solely on the converter.


Title: Re: Stock vs F303
Post by: jayh on July 28, 2012, 07:06:31 am
theres a guy somewhere on the internet that used to have tfs 170's, ported 7515 and f303 and made 1000. his name is trent I think. blow through deal

Brian over at theturboforums.com
He did that quite awhile ago.    Aftermarket block 306. 
Once you go turbo, IMO the need for badass custom billet roller cams is likely not ultimately needed except for people doing high end racing. 
Find the " when will it grenade" thread  and you'll shit at what can be accomplished with very very stock parts and a turbo. 
Locally we had a guy do 600+hp with an F-cam and GT-40 top end and stock bottom.  Good fuel goes a long ways.   

Im pretty sure this guys name is trentk and hes from around atlanta georgia

Ive been wrong before


Title: Re: Stock vs F303
Post by: juiced coupe on July 28, 2012, 09:19:56 am
While his car does have a F cam, it also has ported High Ports, a 88 mm turbo (last I heard), and is a 347.


Title: Re: Stock vs F303
Post by: Bossman on July 28, 2012, 11:17:52 pm
2 different guys. 


Title: Re: Stock vs F303
Post by: jayh on July 29, 2012, 11:39:23 am
it may have even been Brent Davis actually. I dont even remember. I did alot of research on the 7515 xcelerator when I was working on it. that was maybe 18mos ago though. people talk but they dont like to share pics. most of these guys are turbo blowthrough guys who also run f303. f303 is really really popular with turbo guys. so is the 7515


Title: Re: Stock vs F303
Post by: wywindsor on July 29, 2012, 01:21:33 pm
Can't blame you for not wanting to blow up your good parts. I'm is the same boat wanting more but funds limit my progress. I don't know your case but I wanted to learn to tune my efi and have some fun before spending ten plus thousand plus on a build.


 Ray