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Old 09-21-2011, 05:37 PM   #1
crimson ghost
Scooby Newbie
Member#: 243867
Join Date: Apr 2010
Location: Springfield, Illinois
59 Karmann Ghia EJ

Default Opinions on no IC but water/meth only ?

Mods , please let me know if this would be better suited to the swap, or water/meth forum.

I haven't found quite what I want to know through the search and was hoping you all would chime in.

I have a stock EJ20K with a t3/t4 that will be going in my 1959 VW Karmann Ghia. I don't plan to run huge boost and wondered if I could get away with just water meth and no intercooler ????
Would I need to run E85 plus water/meth for it to be safe ????
What boost would be considered safe with matching injectors ?

The rear of the car doesn't get much air flow and it would help not to cut up the engine compartment of a old rare car.
Thanks for your help !
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Last edited by crimson ghost; 09-21-2011 at 06:04 PM.
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Old 09-21-2011, 09:36 PM   #2
Scooby Specialist
Member#: 144751
Join Date: Mar 2007
Chapter/Region: MWSOC
Location: Granger, IN
7064 TS WRB


How much boost? Safe? Sure, if properly tuned and prepared. You wouldn't want to run a lot of boost. E85 would certainly make it much safer than pump gas...
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Old 09-22-2011, 12:56 PM   #3
Matt Monson
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Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ


I wouldn't do it. If you are worried about cutting up the tub, go with an AWIC and find somewhere to put a small radiator out in the air flow away from the engine bay.
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Old 09-22-2011, 03:05 PM   #4
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Member#: 154173
Join Date: Jul 2007
Location: Ghetto, AR
2006 STI


I'd run a AWIC before I ran meth on that thing.
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Old 09-23-2011, 01:20 PM   #5
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Member#: 294641
Join Date: Sep 2011

I did this, no real power gain so I went back to the stock intercooler and meth.
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Old 09-23-2011, 04:47 PM   #6
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Member#: 183497
Join Date: Jun 2008
Chapter/Region: International
Location: In the Desert
1998 V4 RHD STi


On my friends old RX7 he did it for fun one time and logged the IAT's and it turned out that he was able to get sub ambient temps but every application is different.
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Old 09-23-2011, 04:49 PM   #7
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Member#: 79643
Join Date: Jan 2005
Chapter/Region: NESIC
Location: Cromwell
2015 WRX STI
Terminal black pearl


My old 93 legacy turbo had no intercooler from the factory.

And a puny turbo.

I have nothing to really offer here.
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Old 09-24-2011, 12:18 PM   #8
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Member#: 159682
Join Date: Sep 2007
Chapter/Region: NESIC
Location: Maine
1995 WRX
2015 F150


Maybe. A big turbo running low boost won't need as much charge cooling as a small turbo with high boost. Only way to know for sure is try it and monitor your IAT.
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Old 09-26-2011, 08:43 AM   #9
Sammo Hung
Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: S Ga / N Fla


there are water/meth kits out there and can be configured
to spray low positive manifold pressure (boost).

look for kits that run off of MAP sensor readings
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