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Old 07-03-2008, 10:06 PM   #1
DemiSlayer
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Default 75lbs/min turbo cam recomendation

Hi just want a quick cam recommendation

pt67 turbo 75lbs/min wheel

built sti engine etc etc etc.

would like streetable for weekend drivability.
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Last edited by DemiSlayer; 08-06-2008 at 12:25 PM.
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Old 07-03-2008, 11:34 PM   #2
dibblejr
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It depends on what type of sporting event you want and when you want the power. If you want power in the low end like for autoX/ rally you want 260 or 262 intake and around a 270 E cam.

If you want top end perhaps 268I/ 270E.

Its hard without knowing what you want to do with your ride.

My Kelford cams and heads were designed for autoX and rally and I was running 268/ 272 and i had no problems with the street DD. If you go too large you will have idle problems and require high rpms to keep the engine running optimum.

Jay-R
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Old 07-03-2008, 11:45 PM   #3
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Mainly street sometimes drag on the weekend rarely. my builder said i would be fine with stock sti cams but he is not a tuner.
was looking for 600whp - 700 maybe on race fuel

other mods: as in my other thread
02wrx

2005 2.5rs intake manifold
phonolic spacers
koyo radiator
oil cooler
12mm oil pump possibly depends on what rpm range i will do
accusump
q45 90mm throttle body
FMIC
pt67 turbo
greddy un equal length headers
custom up pipe with rotated / external waist gate
custom down pipe
invidia street exhaust
BDL fuel rails
rc 1000cc injectors
aeromotive FPR
buscher racing dual fuel pumps
AVCR boost controller
TIAL 50 mm BOV
TIAL 44mm waistgate

sti 257 block bored and honed
je rods pistons rings
arp bolts
acl barrings
sti heads pnp
cosworth springs retainers
cosworth head gasket
arp head bolts

possibly hydra 2.6 for em


lots of other crap.
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Old 07-04-2008, 03:29 AM   #4
bugeyes
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Based on the size of the compressor flow you would have to be looking at running at least 270 degree cams.
Of course with that sized turbo you wont be using it for autocross so down low power would not be of primary concern.
The 270 size would start to come on song at around 4000 rpms. I'm running them and still find it very streetable and idles really good at 1100rpms.
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Old 07-04-2008, 09:03 AM   #5
dibblejr
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^^ I agree with bugeyes 270's probably your best bet. I dont think the STi stockers would be your best bet. They would work but you would run out of the top end sooner. Depending on your head work and what size pistons you can probably have your redline set at around 8500 or so.

Sounds like you are on the right track. If you want some really good cams setup for your preference send your heads to Kelford and they can flow match everything for you. They are not cheap by no means but the best in the business IMO.

Jay-R
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Old 07-04-2008, 01:44 PM   #6
DemiSlayer
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Thanks folks!
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Old 07-08-2008, 01:55 AM   #7
fateo66
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I have a 72 lb/min turbo and run a set of crowler stg4 cams. They are 272* and I love them.
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Old 07-08-2008, 02:23 PM   #8
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anyone offseting the cams such as 272exhaust 270intake or 260 exhaust 272 intake etc with a 75lbs turbo. would like to know some results or more specificly drivability results.

deffinatly going with 272 cams now. thanks!
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Old 07-09-2008, 12:19 AM   #9
ilivas
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I'm running 272 cams with my turbo. I actually have the same turbo as you.
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Old 07-09-2008, 07:55 AM   #10
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any details on hp output and spool time? thanks.
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Old 07-09-2008, 09:31 AM   #11
joekerk
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Bro did u put selvee onto ur block? any billet crank?
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Old 07-09-2008, 10:17 AM   #12
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not sleeved

sti crank
racing barrings not sure brand
je pistons
je rods
chromoly rings
arp block bolts
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Old 07-09-2008, 10:24 AM   #13
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I have another thread that has detailed info on my mods. i really dont see the need to run sleeves on a pt67 turbo unless i go bigger or want more boost etc. my builder built the block to withstand 700whp he has made others that have withstood much higher. as for oil i am going to be running a 12mm oil pump and an accusump.
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Old 07-09-2008, 03:51 PM   #14
ilivas
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I made 435whp@6k rpm on 22 psi. I couldnt get it to rev any higher on the dyno for some reason. It revs to 8500rpm on the street though. I get full boost around 5500rpm.
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Old 07-09-2008, 03:55 PM   #15
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435whp seams super low for a pt67 75lbs/min turbo what was your mods ? mitch here in town has a 800whp sti but he ran a pt67 before the 42r and made over 550 on low boost with the pt67.
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Old 07-09-2008, 04:02 PM   #16
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a greddy t67 and a pt67 are totally different turbos btw. a pt67 is bigger than a gt35r just so you know.
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Old 07-09-2008, 04:19 PM   #17
ilivas
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I have a pt67 (75 lb/min) with p-trim turbine wheel, not a greddy(mitsubishi 25g) T67. The only difference between mine, and yours is that mine is not ball bearing, which would give you a little faster spool.

Take into account it was cutting out on the dyno right when I hit peak torque or a little before. If I had the other 2500 rpms to go, it would of been MUCH higher. This was also on 93 octane pump gas. I havent dyno'd with methanol or race gas yet. This was also on a low reading dyno dynamics.

I have

272 cams with valvesprings, and retainers
CP pistons
manley rods
cosworth rod bearings
custom fuel lines with twin walbro fuel pumps
adjsutable fuel pressure regulator
balanced crank
AR fab modded oil pump
AR fab harmonic balancer
Aeromotive fuel rails
deatchworks 1150cc injectors

ems is turbo xs utec w/ speed density, and apexi avcr for boost

and all that other good stuff.
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Old 07-09-2008, 05:46 PM   #18
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Seams extremely low for that big of a turbo as i have seen better numbers on much smaller turbos. any head work? this is not a good vote of confidence maybe i will need to get a better turbo.
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Old 07-09-2008, 06:15 PM   #19
ilivas
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It doesnt matter what turbo you get, you wont be making 600whp on pump gas on a subaru.

Race gas, I could get 600whp all day. I didnt dyno on race gas because I was having problems that I needed to take care of.

I dont think you're understanding, that my car cut off on the dyno at 6k rpm. If it ran to 8500rpm on the dyno like it does on the street then I would have a significant amount more power.

Yes, I do have ported heads, and oversized valves. Numbers arent the important thing. Especially since this is a low reading dyno. This is not a dynojet were 500whp has you running mid 11's. 450whp has you in the high 10's on this dyno.
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Old 07-09-2008, 07:40 PM   #20
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Good point. though there are some who have hit 500+ on pump on low reading dynos.
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Old 07-09-2008, 07:43 PM   #21
ilivas
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I probably could of done that if I would of revved it up to 8500rpm instead of 6000rpm.
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Old 07-09-2008, 07:43 PM   #22
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anyway how drivable is your setup i am hoping to get full spool at 4500 range. my turbo is not dual ball bearing.
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Old 07-09-2008, 07:46 PM   #23
ilivas
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It's drivable. I mean. It's like driving a civic ex when it's not under boost. That's good enough for me to get around town. I got full boost at 5500rpm. This is on aftermarket unequal length headers not wrapped or coated, a custom 2.5" up-pipe, and a p-trim wheel. What size is the turbine wheel in your turbo?

I could probably get it to spool a bit sooner with a better tune.
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Old 07-09-2008, 07:53 PM   #24
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I beleive its a P-trim its 70ar cold side and 84ar hot side

greddy un-equal lenght headers ses up pipe and custom rotated adapter
i will wrap the lot.

also have a avcr to control boost

my heads are going to be ported

i have cosworth retainers and springs havnt got the cams yet
might want to get a pair of offset cams to help spool though
260/272 or 272/260 etc
also havnt got bigger valves yet either still considering them.
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Old 07-09-2008, 08:06 PM   #25
ilivas
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You may want to make sure that the uppipe is large enough. My car was pretty choked with a stock sized uppipe. I picked up quite a bit more power with the larger uppipe. Stock is 1.75", mine is 2.5".
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