Different twin turbo setup

EmmaG · 16th July 2004, 01:36 PM

Ok this might be a really stupid question, but could you run a Supra with different sized twin turbos?

Say a bigger 1st turbo and a smaller 2nd?

Not saying I would want to, but is it possible?

Chris Wilson · 16th July 2004, 01:53 PM

Do a search on tractor pulling and compound turbocharging. It's possible, but not in the simple way I suspect you are thinking of it, ie, 2 turbos in parallel, one big, one small.

EmmaG · 16th July 2004, 01:56 PM

Thanks Chris,

(lol at Tractor pulling&#33

I will have a search on compound turbocharging.

alex h · 16th July 2004, 05:07 PM

Doesn't the RX-7 use this? 1 small 1 large.

Chris Wilson · 16th July 2004, 10:11 PM

No, the FD model RX-7 sequential turbos are exactly the same size. Common mistake though, dunno how the yth started.

Martin F · 16th July 2004, 11:19 PM

Same way the MKIV Supra turbo size myth starts, BS !

alex h · 17th July 2004, 09:53 AM

Ahh ok - I didn't believe it when I first heard it but so many people said it!

17th July 2004, 10:33 PM

You could , but you would not want to . The smaller vs bigger will create uneven backpressure in the manifold , that may lead to different loading on the crank . It sounds liek a myth , but ive read up on it , and how bad it is to run say a 6 cyl car on 5 cyl for longer periods . This would be simmilar .

20th July 2004, 10:34 AM

A couple of blokes in OZ did this last year. There was a thread on Supraforums but I can't find it...

Martin F · 20th July 2004, 10:38 AM

Yeah i remember reading about that one, but i'm not sure if they ever got it working successfully.

16th July 2004, 05:07 PM	#4
alex h Old Timer Join Date: Sep 2003 Location: East UK Posts: 887	Doesn't the RX-7 use this? 1 small 1 large. __________________ Regards Alex H

16th July 2004, 11:19 PM	#6
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Same way the MKIV Supra turbo size myth starts, BS ! __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

17th July 2004, 09:53 AM	#7
alex h Old Timer Join Date: Sep 2003 Location: East UK Posts: 887	Ahh ok - I didn't believe it when I first heard it but so many people said it! __________________ Regards Alex H

20th July 2004, 10:38 AM	#10
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Yeah i remember reading about that one, but i'm not sure if they ever got it working successfully. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

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16th July 2004, 01:36 PM	#1
EmmaG Old Timer UK Spec - Manual Join Date: Aug 2003 Location: Essex Posts: 1,934	Ok this might be a really stupid question, but could you run a Supra with different sized twin turbos? Say a bigger 1st turbo and a smaller 2nd? Not saying I would want to, but is it possible?

16th July 2004, 01:53 PM	#2
Chris Wilson Non-Approved Trader Join Date: Sep 2003 Location: Shropshire Posts: 247	Do a search on tractor pulling and compound turbocharging. It's possible, but not in the simple way I suspect you are thinking of it, ie, 2 turbos in parallel, one big, one small.

16th July 2004, 01:56 PM	#3
EmmaG Old Timer UK Spec - Manual Join Date: Aug 2003 Location: Essex Posts: 1,934	Thanks Chris, (lol at Tractor pulling&#33 I will have a search on compound turbocharging.

16th July 2004, 10:11 PM	#5
Chris Wilson Non-Approved Trader Join Date: Sep 2003 Location: Shropshire Posts: 247	No, the FD model RX-7 sequential turbos are exactly the same size. Common mistake though, dunno how the yth started.

17th July 2004, 10:33 PM	#8
Guest Posts: n/a	You could , but you would not want to . The smaller vs bigger will create uneven backpressure in the manifold , that may lead to different loading on the crank . It sounds liek a myth , but ive read up on it , and how bad it is to run say a 6 cyl car on 5 cyl for longer periods . This would be simmilar .

20th July 2004, 10:34 AM	#9
Guest Posts: n/a	A couple of blokes in OZ did this last year. There was a thread on Supraforums but I can't find it...

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