Building Single turbo kit questions

2fst4urtrk

OHIM2FST4U
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Currently have 03 cobra with ported heaton (mods in sig).

Ive been throwing the idea of building my own turbo single turbo kit and had a few questions.

-Goal is 650-850whp (multiple tunes)
-91 and e85, already fuel return with 1050s and going from twin 340s to twin 465s
-use hpx maf
-15-20psi bone stock motor
-keep t56
-have 3.55s still irs car.
-already have UPR chrome kmember and a arms with coilovers
-76mmish turbo bb, .96 ar ish size

-I have a 04 mach 1 intake i got for cheap. should i have it ported? add plenum spacer? factory throttle body?

For this hp goal should i run 3 or 3.5" ic piping, 3" from turbo to fmic the 3.5 from fmic to throttle body? all ic piping will be Aluminum.
54mm bov?
-bov as close to fmic as possible.

I plan to do 2.5" stainless hot side (wrapped) with 2 46mm waste gates vented, factory manifolds flipped forward facing. keep ps, ac, abs, move radiator forward if needed.

Ill make a 4" down pipe then y into magna flow cat back, possibly add a cut out.

car right now at 3500rpm puts down 575ftlbs. id like to keep the peak torque around 3500-4000rpm area. willing to sacrifice some hp to have a more streetable car.

Thanks in advance for the info guys!
 
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KEVINS

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My 2 cents:
I wish I could help with more details but I will recommend keeping all the piping to the turbos smaller than what you would normally see on kits. This will help keep the spool time up. I did a lot of research before doing my 2V (900+hp) and there are some insane power numbers using 2.5" pipes which IMO is OVERKILL for cars making only 1000hp or less.

My headers use 1.5" primaries with 2.25" collectors stepped down to 2" pipes feeding each turbo then 2.5" from each turbo into the IC. I think you can use 3" into the IC since you're using a single turbo

Cosmetically I love the look my 3.5" pipe from the IC to the TB but it's definitely overkill and can hurt spool time a bit. It's also a lot harder to route to clear engine components and the hood. I'd stay with 3" on it and it won't hurt ya any.

ks
 

2fst4urtrk

OHIM2FST4U
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sounds good!
i may do 2.25 hot side and 3.5" down pipe then. all ic piping probably 3" (i have alot of 3"al laying around lol)

welding and fab wont be an issue for me but the logistics of sizing is where i need help. also do 4an oil feed and 12an drain to factory pan unless the larger 7qt pans make a difference. My oil changes already take 7qts as is with the mmr relocation kit lol.
 

2fst4urtrk

OHIM2FST4U
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Ill be using 3" ic piping and a new air to water intercooler, making larger ic res where battery goes, but keeping meziere pump.

waiting to hear bout a used cg fab kit but otherwise will use factory manifolds and 2.25" piping to 3" t4 flange. will be staying with 3.5" down pipe.

anyone use the vortec a2w kit on there turbo kit?
 

01yellercobra

AKA slo984now
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I would stick with an air to air set up. If anything it won't be as crowded in the engine bay that way. Plus you're stuck with that intercooler. I don't remember what the limit is, but I remember hearing a few guys hitting it. With a front mount you can upgrade as needed.
 

lightningkid831

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3” cold side will be plenty. I’m running a custom borg s485, made 780 blowing through the converter pretty bad at 30 psi (got the converter tightened up, but haven’t been back to the dyno). Had to add a third 465 pump at that level.

I’m running precision 1000 a2w intercooler, mounted behind the front bumper. For a mostly strip setup, a2w is the way to go.
 

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