Hey guys i'm new to the site! i've got a 96 cobra with basic bolt-ons and want to put together a stout bottom end for my turbo kit i'm gonna build! I'm new to the internal side of things and i need some suggestions on what kind of rods and pistons to put in it, compression ratio that safe to run, if i should replace or do anything once i've got the motor torn down(oil pump, water pump, timing chain) what size turbo i should run, should i have head work done, aftermarket cams, what kinda power numbers i can expect and just any basic info on building a rock solid bottom end and turbo kit! open to all suggestions! any info is greatly appreciated!

thanks
branden

 

8:5 compression would be ideal. You should check out Modular Mustang Racing. They have great quality of parts and have good deals on products. They are a forum member so just hit them up, they will hook you up! Welcome to the forums BTW.

 

thanks bro!

 

No problem broski

If it was me, I would get the MMR oil pump with teflon coated gears, I would go with a 70mm. I would put custom MMR turbo cams in it and have the heads ported. The MMR 900 pro mod stroker kit is f-in sweet. As you can tell i like the MMR products. If you get on "the builds" forum, there is a budget DOHC turbo build going on right now. That would be a good place to get some info from. Be sure and keep us updated with pics and info on the build.

 

yeah i'll for sure check out that build! i can't decide wheather to stroke it or just go .030 over! and i heard a 76mm would be better for the 4v. any fuel system advice?

 

Ya i didnt think about it being a 4v car. A 76 would definitly do alot better. If you arent wanting to just spend a whole lot of money, just go .30 over with it. For fuel systems, I have a buddy that was doing forced induction on his cobra and he just put a 255gph fuel pump and bigger fuel rails and it did just fine. I would say u need to run atleast 42lbs injectors.

 

and i assume i would need bigger mass air and throttle body? what kinda power numbers did your buddy put down? what kinda boost?

 

a t70 with big a/r on the exhaust will max out 255lph and 42's

at 14 psi stock 2v heads cams intake and a forged 5.0 bottom end I did 640whp (42's and 255lph)
When it was tuned the guy said he had to do alot to keep a/f below 12 at higher rpms at 14 psi

so your stock 4v heads will do way better and you have more rpm

 

i can't remember what my buddy put down in his car. I know it was the stock long block tho. I think it was high 400's at 10psi. Yes you would need the matching mass air flow meter for the injectors and a bigger TB.

 

on a completely stock motor I made 420whp at 8 psi (t70)

 

I wouldnt go any less than 9:1 compression. I prefer 9.5:1 on mod motors. I made the numbers in my sig with a very safe tune, and 15psi. Now with the race heads and cams 700+ will be a cake walk.

 

What bottom end do u have in your car?

 

05+ alum block(most carbon) considered the strongest, even over the Teksid
Forged Callies Crank
Manley Forged H-beams
CP pistons 9.5:1
SS rings
cleavite bearings

 

Thats pretty impressive. I didnt know that those blocks were stronger than the teksid blocks.

 

Feel free to poke around in the engine build pics

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mine was on 9 to 1 compressions also

 

Went from 8.5 to 9.5 and love the added power and not to mention faster spool times.Please learn from my mistake

 

i agree 9.5

 

JE pistons, CP, or Manley 2618
Eagle, Manley H beam rods 4340 with ARP 2000 rod bolts
A good set of rings
Cobra crank.

Street car application
Precision 76GTS or 78GTS T4 with a .96 A/R <single turbo>
Precision twin 6169E with a .58 A/R

Race car application
T6 88MM mid frame
T6 BW S480 1.10 AR with a .87mm exhaust wheel

 

With a 4v, I would go 9.5:1. An 8.5:1 4v is a dog out of boost. I like to keep the bore as small as possible even if it means ordering a custom piston for .005 or .010 over. Head gaskets tend to seal better on these blocks when done this way. MMR is a vendor on here and has a nice set of rods for this app. You can get the complete rotating assembly or shortblock from them.