COMPRESSION FOR TURBO MOTOR?

sn-95aac · May 25th, 2007, 06:12 PM

i'm getting a 363 dart built right now for my stang. i'm using 66mm single turbo for now. the heads i'm using are afr's 205's. with those heads the compression will stand at about 9:1. in future i'm planning to put another 66mm.. make it twin. is that a good compression for a turbo setup?? i'll be using the car on the street as well.

TurboLX · May 25th, 2007, 06:23 PM

its better then most, but it is do able for sure, who makes the turbo?

sn-95aac · May 25th, 2007, 07:07 PM

Originally Posted by TurboLX

its better then most, but it is do able for sure, who makes the turbo?

i have the stage 2 kit from hp performance.... it s a pretty good kit.

8A_Honda · May 25th, 2007, 09:00 PM

I'm gonna go with 8.5:1 if I can ever scrounge up the money to build me a motor. The lower the compression, the more boost you can run. You can probably run that ratio okay but won't be able to run as much boost as a motor with 8.5:1 or lower. Tuning always plays a good role in that as well having an intercooler though.

Stangzilla · May 25th, 2007, 09:04 PM

Originally Posted by 8A_Honda

I'm gonna go with 8.5:1 if I can ever scrounge up the money to build me a motor. The lower the compression, the more boost you can run. You can probably run that ratio okay but won't be able to run as much boost as a motor with 8.5:1 or lower. Tuning always plays a good role in that as well having an intercooler though.

9:1 is fine plus since he will be running twins soon he will have plenty of boost without running 18+ psi. With twins 12-14lbs will rip just fine..

8A_Honda · May 25th, 2007, 09:07 PM

Yeah, I was just pointing out that he'd be able to run "more" boost with a lower compression motor. But yeah, that should be fine depending on the tune.

fogged306 · May 25th, 2007, 09:14 PM

I would love to see some video of that at the track when you are done! That should move quite nicely as long as its tuned right like 8A_honda said.

How did that taste by the way :wink

TurboLX · May 26th, 2007, 10:18 AM

well if you havent built the motor yet, try to find the lowest comp. pistons possible and in your price range

sn-95aac · May 26th, 2007, 02:26 PM

Originally Posted by TurboLX

well if you havent built the motor yet, try to find the lowest comp. pistons possible and in your price range

i orderd the motor this past monday.because of the heads i'm getting it will keep it at a 9:1... i was told that should be good enough for a turbo and at least 20 lbs of boost plus its good to drive around on the street and be able to use pump gas. oh by the way i posted a topic a while back about a 393 dart with a procharger f1-r well we finally got to run the car and it ran a best time so far 10:20. we blew the tranny twice already.

TurboLX · May 26th, 2007, 02:47 PM

i read that, you on TM.com??

86er · May 26th, 2007, 03:45 PM

9.1 is great for a turbo, if you go too low, you have to over boost to get the gains back from the lost compression. 9.1 with a motor built right will live a long time and make great number

ChrisJ · May 26th, 2007, 03:53 PM

I have always been told that turbos like alittle more compression thena supercharger...Most of the people I know run 9:1 or 9.5:1 with their turbo set-ups...

SALIV8 · May 26th, 2007, 05:10 PM

Originally Posted by sn-95aac

Originally Posted by TurboLX

well if you havent built the motor yet, try to find the lowest comp. pistons possible and in your price range

i orderd the motor this past monday.because of the heads i'm getting it will keep it at a 9:1... i was told that should be good enough for a turbo and at least 20 lbs of boost plus its good to drive around on the street and be able to use pump gas. oh by the way i posted a topic a while back about a 393 dart with a procharger f1-r well we finally got to run the car and it ran a best time so far 10:20. we blew the tranny twice already.

10.20s only with an f1r???? the tires mustve been spinning the whole time...u can go in the 8s for sure with that

TurboLX · May 26th, 2007, 05:53 PM

Originally Posted by ChrisJ

I have always been told that turbos like alittle more compression thena supercharger...Most of the people I know run 9:1 or 9.5:1 with their turbo set-ups...

My TT V8 has a 9:1 comp. but this makes it better because you would be able to up the fuel and less of a pain to tune

sn-95aac · May 28th, 2007, 05:23 PM

Originally Posted by SALIV8

Originally Posted by sn-95aac

Originally Posted by TurboLX

well if you havent built the motor yet, try to find the lowest comp. pistons possible and in your price range

i orderd the motor this past monday.because of the heads i'm getting it will keep it at a 9:1... i was told that should be good enough for a turbo and at least 20 lbs of boost plus its good to drive around on the street and be able to use pump gas. oh by the way i posted a topic a while back about a 393 dart with a procharger f1-r well we finally got to run the car and it ran a best time so far 10:20. we blew the tranny twice already.

10.20s only with an f1r???? the tires mustve been spinning the whole time...u can go in the 8s for sure with that

we spin tires alot once we get out of the hole but other than that the car is running real good. i'm only pushing 10lbs

May 25th, 2007, 06:12 PM	#1
sn-95aac Regular Join Date: Oct 2006 Posts: 106 iTrader: 0 reviews	COMPRESSION FOR TURBO MOTOR? i'm getting a 363 dart built right now for my stang. i'm using 66mm single turbo for now. the heads i'm using are afr's 205's. with those heads the compression will stand at about 9:1. in future i'm planning to put another 66mm.. make it twin. is that a good compression for a turbo setup?? i'll be using the car on the street as well. __________________ 95 TURBOCHARGED COBRA 87 BLOW-THRU FOX

May 25th, 2007, 06:23 PM	#2
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	its better then most, but it is do able for sure, who makes the turbo? __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

May 26th, 2007, 10:18 AM	#8
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	well if you havent built the motor yet, try to find the lowest comp. pistons possible and in your price range __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

May 26th, 2007, 02:47 PM	#10
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,778 Blog Entries: 1 iTrader: 0 reviews	i read that, you on TM.com?? __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

May 26th, 2007, 03:45 PM	#11
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	9.1 is great for a turbo, if you go too low, you have to over boost to get the gains back from the lost compression. 9.1 with a motor built right will live a long time and make great number __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

May 25th, 2007, 09:00 PM	#4
8A_Honda Regular Join Date: Jan 2007 Posts: 313 iTrader: 0 reviews	I'm gonna go with 8.5:1 if I can ever scrounge up the money to build me a motor. The lower the compression, the more boost you can run. You can probably run that ratio okay but won't be able to run as much boost as a motor with 8.5:1 or lower. Tuning always plays a good role in that as well having an intercooler though.

May 25th, 2007, 09:07 PM	#6
8A_Honda Regular Join Date: Jan 2007 Posts: 313 iTrader: 0 reviews	Yeah, I was just pointing out that he'd be able to run "more" boost with a lower compression motor. But yeah, that should be fine depending on the tune.

May 25th, 2007, 09:14 PM	#7
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	I would love to see some video of that at the track when you are done! That should move quite nicely as long as its tuned right like 8A_honda said. How did that taste by the way :wink

May 26th, 2007, 03:53 PM	#12
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	I have always been told that turbos like alittle more compression thena supercharger...Most of the people I know run 9:1 or 9.5:1 with their turbo set-ups... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

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