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Old 06-05-2002, 02:53 PM   #1
Scooby Specialist
Member#: 5960
Join Date: Apr 2001
Chapter/Region: Tri-State
Location: Atlantic City, NJ
FXT [email protected] 93 oct
NSX 450 whp SC'd (93 oct)

Default stroker kit -->full boost sooner?

OK, fella's, here's a question for you. If you stroke an EJ20, how much sooner should one expect to see full boost?

I know that's an extremely open-ended question, so if you want it with less variables, here's what I'm scheming...

A 2.2 or 2.4 stroker kit, and a TD05-18G turbo (flows 600 cfm on a 2.0 liter @15 psi...so its a big honkin' turbo!)

Or, if you prefer, how would my current TD05-16G (505 cfm) spool-up change if I did a 2.2 or 2.4 stroker? Right now I have full boost at 3300. I suspect that for every .1 liter displacement I add, I can expect ~100 RPM sooner to full boost, but I could be totally wrong on this. Also, for arguement's sake, let's say full boost is 1 bar (14.5 psi)...obviously part of the point of an EJ20 stroker kit is the ability to run serious boost (1.5-2 bar), but let's discount that.

Can anybody break me down on the relationship of displacement to turbo spool-up times?
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Old 06-05-2002, 04:49 PM   #2
Scooby Newbie
Member#: 16040
Join Date: Mar 2002
Location: NY USA
1998 Impreza RS


does stroking increase compression ratio and/or displacement?
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Old 06-05-2002, 07:25 PM   #3
Scooby Specialist
Member#: 524
Join Date: Nov 1999
Location: WA
04 STi


Sure, more displacement = more exaust flow all other things being equal.

Use an EJ-25 crank and stock bore for a 2.2L I think a EJ-22 block and a EJ-25 crank is the 2.4L (guess), and the EJ-25 crank in a EJ-25 block= 2.5L (amazing huh?)

I'd just hit up a EJ-25 shortblock with custom rods and pistons personaly.
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