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Registered:
September 2003
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7MGE Power
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Sat, 20 September 2003 23:41
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Hi,
I'm seriously looking at getting an MA70 NA 5sp supra. Turbo isnt an option, but how well do the 7MGE's respond to say
Stage 1) Exhaust, decent panel filter, cold air induction system to the airbox
Stage 2) Shave the head, raised compression, reground cams?
Any tips on getting power without turboing?
Cheers,
Chandler
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Membership Secretary
Location:
Sydney
Registered:
June 2002
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Re: 7MGE Power
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Sun, 21 September 2003 08:02
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I'm thinking about doing the same thing to my 7MGE in my crown
However I'll only be doing the exhaust and the intake. Like anything they should respond but as they say turbo equals cheap power
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7MGE Power
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Sun, 21 September 2003 23:28
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speak to ed_ma61... he currently has the same project
Dan
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Location:
Brisbane
Registered:
May 2002
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Re: 7MGE Power
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Mon, 22 September 2003 01:10
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Yeah he must be sleeping /away on holidays or something! Never seen him take so long to respond to a 7mge thread!
However a short search will prbly bring up a few of his old thread which have lots of good info in em!
Cheers
Wilbo
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7MGE Power
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Mon, 22 September 2003 01:13
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Heh
ED WAKE UP!! 
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: 7MGE Power
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Mon, 22 September 2003 01:25
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He is right in the middle of his final exams.....give him a day or 2.
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Location:
melb
Registered:
June 2003
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Re: 7MGE Power
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Mon, 22 September 2003 08:48
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porting,COMPRESSION
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 7MGE Power
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Wed, 24 September 2003 07:07
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http://forums.toymods.org.au/index.php?t=msg&t h=18411&rid=92&S=510737661e176ac3f1e347168 033f718&pl_view=&start=0#msg_151143
Re: 7MGE bore spacing and overbore limit Thu, 14 August 2003 23:09 Go to previous messageGo to next message
oldcorollas wrote on Thu, 14 August 2003 20:11
raw and grunty old tech, like a motor _should_ be...i like the backyard raw motor
stewart, you and i, bud, have some beers to be sunk between us Smile
anyway, steve, here's a *basic* list of what you can easily do to a 7m to shake it up a bit. keep in mind, there are many, many conversations to be had with regards to each of these points, and each of them can be taken to 'silly' extremes - but then youre running into serious motec only territory...
intake:
-cai
-intake pipe
-throttle body/ies
-single vs twin inlet plenum with ACIS
-custom chop manifold with ITB's
-manifold porting and plenum porting
-port matching
head:
-intake porting, from mild to wild
-bowl can have massive improvemnets
-valve seats and seat cutting
-OS valves
-chamber shaping
-decking for CR increase (plenty of meat)
-valve unshrouding
-polishing
-ex valve porting - big gains again
-ex seat cutting
-headers 6-2-1 or 6-3-1 (dunno there?)
-hi flow 2.5" zorst
CAMS
-up to 9mm lift before head recess machining and Shim under modification required
-duration up the ying yang
-valve springs (?)
PISTONS
-truly mssive piston valve clearance
-allows plenty of scope with cam choice, compression machining etc
-pistom crown shaping and polishing
-rings - your call Smile
RODS
-grind and beam polish and peen
-ARP bolts essential
BLOCK:
-GTE block w/ oil squirters (reduce temps a LOT)
-again, given piston tolerances, you can decrease the block deck height significantly (i chopped mine 40thou!!)
-oil return chamfering etc
-external oil cooler fitting stock on some 7mge's
-2 cranks available - single counterweight and double (later models) single is lighter, but less balanced
-i dunno if thyre all like this, but my crank is forged (out of a GTE)
-crank machining, lightening etc
OTHER:
-squish clearance is in your hands - can go to 35thou with stock 7m rods.
-piston squish surface area is ~30%
-head squish area is around ~20-25%
ive happliy squeezed 10.7:1 with basic non-dodgy machining (up from 9.2), and could easily get 11:1... and get this - such machining STILL maintains a non-interference piston/valve fit!!
if you wanted total interference fit, you could go easily to 11.5-12:1 AND run big lift big duration cams, and STILL not have clearance issues (this is with plain old cast ACL jobbies - so not sure how crazy you'd want to go on them anyway!) if you wanted to go custom pistons, the world is yours...
its all shades of grey really - how far down the scale youre prepared to go, what youre prepared to spend and risk, and what you reckon the ECU will run before a motec is required Very Happy
hope thats a start Rolling Eyes as i said each point is a conversation piece!
cheers
ed
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Location:
Melbourne
Registered:
May 2002
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Re: 7MGE Power
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Wed, 24 September 2003 07:43
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| ed_ma61 wrote on Wed, 24 September 2003 17:07 |
stewart, you and i, bud, have some beers to be sunk between us Smile
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Im really starting to worry about you Ed!
on another note i need to find out whats available in forgies to get my compression about 9:1 im going to try a mid compression mid boost setup to get the best of both NA and turbo worlds
Allan
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