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Supercharging and Compression ratios #445836 Apr 19, 7:09am Apr 19, 7:09am
Joined: Apr 2005
Posts: 2
Australia
2000 Black Toyota Celica SX
domino_m OP
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2000 Toyota Celica SX
domino_m OP
2000 Black Toyota Celica SX
New Member
2000 Toyota Celica SX

Joined: Apr 2005
Posts: 2
Australia
Supercharging and Compression ratios
Hey,

I'm new here, and being that my knowledge ain't so great. I have recently picked myself up a 2000 model Celica SX (same engine as GTS, just right hand drive). Anyways, I have been looking at a whole range of performance parts for my new little car. From the owner, the car came with a Blitz cat-back exhaust and TRD headers. Looking to pull some more kilowatts from the engine, and have been considering a Blitz supercharger kit.

I have a fair knowledge of turbo's, and the differences between S/C and turbo power. So i would prefer no lectures on these. I would like to know if supercharging creates an affect similar to turbo's where the engine's compression levels have to be lowered to achieve higher boost pressure. I am looking at the 13.0 ratio pistons to upgrade to as well. Would i be better off just skipping the pistons if i plan to supercharge her?

- Marcus

Re: Supercharging and Compression ratios [Re: domino_m] #445837 Apr 19, 7:46am Apr 19, 7:46am
Joined: May 2004
Posts: 23
MD, USA
2000 Black Toyota Celica
Celiman69
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2000 Toyota Celica
Celiman69
2000 Black Toyota Celica
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2000 Toyota Celica

Joined: May 2004
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MD, USA
Think of it this way, forced induction is forced induction. Your still craming a whole lotta air into you motor. So if you want to raise the boost level your goin to need to lower your compression, so 13.0 pistons is not a good idea. Higher compression pistons is used for N/A tuning. By lowering the compression you giving more room for all that air. more air=more fuel= bigger boom= more power. As far as raising the boost level with a s/c you would have to change the pulley. This is my understanding, anyone correct me if I'm wrong.

Re: Supercharging and Compression ratios [Re: Celiman69] #445838 Apr 19, 1:29pm Apr 19, 1:29pm
Joined: Jul 2004
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Frankfort, IL
combatc87
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2001 Toyota Celica GT
combatc87
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^^Yup


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Re: Supercharging and Compression ratios [Re: combatc87] #445839 Apr 19, 2:20pm Apr 19, 2:20pm
Joined: Jan 2004
Posts: 60
Florida, United States
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iWaNtAcELiCa97
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iWaNtAcELiCa97
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If you lower compression with pistons first, how much HP and TQ would you lose initially?

Re: Supercharging and Compression ratios [Re: iWaNtAcELiCa97] #445840 Apr 19, 2:21pm Apr 19, 2:21pm
Joined: Jan 2004
Posts: 60
Florida, United States
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iWaNtAcELiCa97
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iWaNtAcELiCa97
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Florida, United States
Sorry to get slightly off topic.

Re: Supercharging and Compression ratios [Re: iWaNtAcELiCa97] #445841 Apr 19, 2:38pm Apr 19, 2:38pm
Joined: May 2003
Posts: 522
Lisle, IL
Rave669
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2002 Toyota Celica
Rave669
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Lisle, IL
You can boost with the factory GTS compression of 11.5:1, but you must keep the boost levels conservative, unless you take the needed steps to reduce detonation.

Things like alcohol/water injection, running racing fuel or some form of fuel enrichment, or adding low-compression pistons will all help do this.

You will lose HP/torque initially if you lower the compression before adding forced induction, the exact amount isn't easily determined, since we don't know how much you're lowering compression, or the exact amount of HP your motor is putting out from the get-go. you can probably figure it out witha desktop dyno program pretty easy.


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Re: Supercharging and Compression ratios [Re: Rave669] #445842 Apr 19, 5:03pm Apr 19, 5:03pm
Joined: Apr 2005
Posts: 2
Australia
2000 Black Toyota Celica SX
domino_m OP
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2000 Toyota Celica SX
domino_m OP
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2000 Toyota Celica SX

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Posts: 2
Australia
Awesome responses guys!

Thanks heaps. I'll have to look into obtaining some lower compression pistons or even just run stock for a while. Here in australia, there is virtually no support for these cars. Might have to look into a custom job.

Re: Supercharging and Compression ratios [Re: domino_m] #445843 Apr 19, 9:42pm Apr 19, 9:42pm
Joined: Sep 2003
Posts: 2,242
Fontana, CA
Lucky_317
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2000 Toyota Celica
Lucky_317
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if you want to go S/C I would suggest a custom setup. the blitz kit isn't that great for making a lot of power and it's expensive. IMO it's too small. it also doesnt boost more then 7psi which drops to about 3-4 during lift. we only hit 218 whp outa my teamates.


Best 60' 1.959 best 1/4 - 13.7 @ 101mph
Re: Supercharging and Compression ratios [Re: Lucky_317] #445844 Apr 19, 11:15pm Apr 19, 11:15pm
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Posts: 291
UNION CITY, CA
GTSdrifter
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2000 Toyota Celica SS2 ZZT231
GTSdrifter
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whats the best supercharger for the 7th gen celica GTS??? TRD? Blitz?

Re: Supercharging and Compression ratios [Re: GTSdrifter] #445845 Apr 20, 12:08am Apr 20, 12:08am
Joined: Sep 2003
Posts: 2,242
Fontana, CA
Lucky_317
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Lucky_317
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^^ neither. custom is the only way to do it right. TRD doesnt make an S/C for the GTS.


Best 60' 1.959 best 1/4 - 13.7 @ 101mph
Re: Supercharging and Compression ratios [Re: Lucky_317] #445846 Apr 20, 6:41am Apr 20, 6:41am
Joined: Feb 2003
Posts: 1,304
West Chester, Ohio
2002 Liquid Silver Metall Toyota Celica GT
SLVCELI
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Originally Posted by Lucky_317
it also doesnt boost more then 7psi which drops to about 3-4 during lift. we only hit 218 whp outa my teamates.


How is the amount of boost at lift controlled? Wouldnt you want boost to drop down at lift for reliability issues? I know TRD had a hell of a time trying to get their supercharged gts to not break down. Know anyone that has had a custom gts supercharged celi for a long time?


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