built dohc zc with 8:1 compression, suggest turbo for setup.
I built my dohc zc for boost so I wanted to run lower compression (so when i wanna up the boost), but i made a huge mistake when selecting the (srp)pistons!!! i thought my new compression would be 8.8:1 but thats becaused i made a mistake when i used the compression calculator, I ended up with a 8:1 compression!!!!...so now im not sure on what turbo would be a good fit for the car?
setup: -dohc zc/ si trans.(6 puck act clutch) -eagle rods, srp pistons -delta regrind cams, kms valves,springs,retainers....i cant remember(brand name of) my cam gear's -new oem gaskets/seals and belts (cant remember brand of) bearings -chipped pr4 ecu (xenocron base map), dsm blue top injectors -2.5 inch cat back exhaust and turbo piping -7 inch jrc intercooler, "greddy type" bov right now i only have an hf manifold (would like to still use this for the time being, with a turbo with the right power) and i was gonna use a saab t3 turbo but im thinking that might be too small with my compression ---- up ( i had a t25 on my zc when it was stock and that was too small) with all the info above....what turbo would you reccomend to make up for the way low compression??? ( i dont wanna get new pistons, so im thinking more boost would work) |
Re: built dohc zc with 8:1 compression, suggest turbo for setup.
holset h1c with 12 cm housing
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Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Originally Posted by J.H.Christ
holset h1c with 12 cm housing
anyone else reccomend a turbo to help with my low compression? |
Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Originally Posted by J.H.Christ
holset h1c with 12 cm housing
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Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Originally Posted by 2stockrocketz
any chance i can run that with an hf mani?(for temp. fix.... i need to get my car out of state)
anyone else reccomend a turbo to help with my low compression? |
Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Genuine Garrett T3/T4. Any of the stage 1 turbine variants. T3/TO4B would be great. T3/TO4E if you'll be revving out high, or even T3/TO4S (comes with stage 3 turbine) if you're going balls out. It really depends on what your goals are, but even the T3/TO4B can crush 400whp.
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Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Low CR won't make a big difference in turbo selection, you just have to crank the boost controller a bit more to make the same power as a higher CR setup, BUT you are a lot more detonation resistant which is a great thing with a 75mm bore.
What DOES make a difference is cam selection vs CR. The Crower stage 2 turbo cam is GOD at 9-10:1 CR, but at 7.8:1 CR is too much cam and causes a power loss (car had other issues, so I might be wrong about that). I know that running big all motard cams that work on 2.0 B-series freaking suck on B16 and cause issues, and am transferring that concept onto D-series. All part of my grand unified theory about why stock Z6 cam and 7.8:1 CR Vitara setups do not suck and make great power, a stock cam that is not bad per se but is slightly restrictive works better with low CR. When I have conclusive proof I'll talk more about the subject. :P If you are dealing with Delta 272's then you should be fine. If bigger you may still be fine, Delta won't stick you with a cam that sucks for boost, but you will *definitely* have to play with your cam gears to get them to work really well. |
Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Originally Posted by Joseph Davis
Low CR won't make a big difference in turbo selection, you just have to crank the boost controller a bit more to make the same power as a higher CR setup, BUT you are a lot more detonation resistant which is a great thing with a 75mm bore.
What DOES make a difference is cam selection vs CR. The Crower stage 2 turbo cam is GOD at 9-10:1 CR, but at 7.8:1 CR is too much cam and causes a power loss (car had other issues, so I might be wrong about that). I know that running big all motard cams that work on 2.0 B-series freaking suck on B16 and cause issues, and am transferring that concept onto D-series. All part of my grand unified theory about why stock Z6 cam and 7.8:1 CR Vitara setups do not suck and make great power, a stock cam that is not bad per se but is slightly restrictive works better with low CR. When I have conclusive proof I'll talk more about the subject. :P If you are dealing with Delta 272's then you should be fine. If bigger you may still be fine, Delta won't stick you with a cam that sucks for boost, but you will *definitely* have to play with your cam gears to get them to work really well. |
Re: built dohc zc with 8:1 compression, suggest turbo for setup.
(damn i used to be on hmt allmost daily, since its been so long... i feel like a noob :-[)
Originally Posted by crx2211
Genuine Garrett T3/T4. Any of the stage 1 turbine variants. T3/TO4B would be great. T3/TO4E if you'll be revving out high, or even T3/TO4S (comes with stage 3 turbine) if you're going balls out. It really depends on what your goals are, but even the T3/TO4B can crush 400whp.
Originally Posted by Joseph Davis
Low CR won't make a big difference in turbo selection, you just have to crank the boost controller a bit more to make the same power as a higher CR setup, BUT you are a lot more detonation resistant which is a great thing with a 75mm bore.
If you are dealing with Delta 272's then you should be fine. If bigger you may still be fine, Delta won't stick you with a cam that sucks for boost, but you will *definitely* have to play with your cam gears to get them to work really well. as for my cams, I ordered the combo set up 272/260 (guy from delta reccomended this for my set up) this is a lil section about my cams (from the zcr): 260 Profile Advertise Duration: Int=260 / Exh=260 Duration @ .050: Int=NA / Exh=NA Lobe Separation: NA Gross lift: 400/400 272 Profile Advertise Duration: Int=272 / Exh=272 Duration @ .050: Int=NA / Exh=NA Lobe Separation: NA Gross lift: 425/425 the 'tech guy' said that the 260 was designed to be just a stock replacement without having too many aftermarket bolt-ons, where the 272 works better with modifications. also the 260 out-accelerates the 272 till ~3500rpm where the 272 out-performs. and I hear ya about messing with the cam gears.... that was a problem just to get the engine idling right. we all know this is hmt (so i probaly dont have to say this, but....) but i need a turbo that wont cost more then my build. thanks for all the much needed help guys ;D |
Re: built dohc zc with 8:1 compression, suggest turbo for setup.
Well ----, just get a 14b or a T3 then. Look to spend $100>.
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