3S-GTE Engine Differences

From: Matti Kalalahti (k124476@ee.tut.fi)
Subject: 3S-GTE differences
To: mr2-interest@cyberspace.cyberauto.com (mr2),
        toyota-mods@cyberspace.cyberauto.com (Toyota-Mods mailing list)
Date: Sun, 21 Jul 1996 01:48:40 +0300 (EET DST)

Somebody asked about the differences of the 200hp 3S-GTE's versus
newer 240-250hp ones. This information is about the ones installed
in Celica GT-4's but the same should be true for MR2's too.

1) Compression ratio was lowered from 8.8 to 8.5
2) intercooler was improved, allowing higher boost
3) intake valve lift increased from 8.2 to 8.7mm
4) T-VIS was discarded, and intake chamber enlarged from 1.16l to 1.46l
5) turbo was modified: shaft was made thinner and turbine wheel made
   smaller. Flow capacity was increased from 26.4 to 37 lbs/min.

I compared the power curves of both versions, and these modifications
definately helped power above 5500rpm, while the boost increase
raised the curve all over. Dunno about the low end though (who cares).

-- 
Matti Kalalahti     | Toyota Carina Coupe GT-T TwinCam Turbo '82
k124476@ee.tut.fi   | RWD * IRS * LSD * 3T-GTEU * 232hp and moving on up...
A Huge Evergrowing WWW Home Page * http://www.students.tut.fi/~k124476/