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braydenc4
Registered User
Posts: 1
(6/23/01 11:01:48 am)
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V8 twin turbo supra
Hey Im not quite sure how all this works but hey. There's so much @#%$ I would like to get opinions on. Any body who is seriously into the old MA 70 supra, that knows all about the lines from Japan, drop me a line. I've got an imported one now but I want to get another from Japan, so many questions!
Also anyone with info on turboing V8's drop me a line ( if you can do that here? ) I've got plans to turbo a 4 litre Lexus V8 but i want to see if anyone can give me some expence saving knowledge. Cam's, heads, manifolds etc. I know judge did a TT V8 but that was pushrod, I need to know about quad cams. Has anyone ever heard of someone doing this job. Any help would be great. Not sure haw I get it but? I can be emailed at annasboyfriend@hotmail.com
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MechaMegloManiac
Registered User
Posts: 14
(6/23/01 2:26:58 pm)
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Re: V8 twin turbo supra
Yep...I've heard and read plenty,1 guy in the states built some salt plane speeder,mild ports on the heads,bog stock bottom end,it ran 60PSI and made 2300HP,theres also a Lexus
4.0 running methanol and LPG,supercharged,its making around the 650mark,with a lot more to come,I myself have been toying with the idea of bolting on 2 SC14 zingers overdriven,on a 4.7lt Lexus engine,either dropping it into a
Sprinter,or,as you suggest,the wider body of the Supra,what you need to do 1st is decide what you want from the end product,is it to drag,drift or curcuit?? either way,if your asking about the viability of such a project,it's very possible,
I'd suggest,with just 2 CT-26's from a wrecker supplying each
bank with 12 PSI,you'd be making a lazy,very reliable and economical 500HP,HKS have recently built a TT making an estimated 1100HP.
Smuggla.
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braydenc4
Registered User
Posts: 3
(6/23/01 6:14:05 pm)
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V8 twin turbo supra
Alright! so a set of cam gears and some mild porting and I should be in business! I just got confirmation today of my supra comming from Japan. I've got the little seen slim body version of the MA 70, looks beautiful, black, targa, should be sweet! I'll rip out the 2 litre stock motor and then it's time for the mods. Could you sugest someone with experience in these sort of mods thats in Sydney.
PS are the CT 26's from the 2.5 litre supra motor? and what are they worth.
Thanks for the info!!!!!!!!!!!!!!!!!!!!!
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BoostRepair
Moderators
Posts: 33
(6/24/01 2:37:33 am)
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Re: V8 twin turbo supra
I've stripped down a few Lexus V8s to be buolt up for turbo...only problems is factory compression ratio is well over 10:1 , so a drop of compression is a must
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MechaMegloManiac
Registered User
Posts: 16
(6/24/01 7:03:49 pm)
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Re: V8 twin turbo supra
The CT-26 comes on the 3.0lt 6 ,should get 1 for around the $300 mark.The cams are scissor drive,so cam wheels are not very viable.10:1 is high,but with a decent intercooler and management,you should be able to tune around it.
Smuggla.
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BoostRepair
Moderators
Posts: 34
(6/24/01 7:54:29 pm)
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Re: V8 twin turbo supra
not with cast pistons sonny. why not ceramic coat them and bump up the compression ratio a bit more, see how good those head gaskets are :P
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MechaMegloManiac
Registered User
Posts: 17
(6/25/01 1:52:24 pm)
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Re: V8 twin turbo supra
The bottom ends run four bolt mains,a very serious crank,perfect factory balance,the 100K/W and ZE 4ag run ceramic coated pistons,I think theres a very strong possibilty
the items will be semi-forged,if not fully.The gaskets could be swapped for some TRD metal composites,though,I wouldnt be rushing to crack it open,Toyota dont do things by halves.It will love it.
Smuggla.
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BoostRepair
Moderators
Posts: 41
(6/25/01 8:10:37 pm)
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Re: V8 twin turbo supra
like I said....I've pulled down these engines. They have 6 BOLT MAIN BEARING CAPS, not 4. the pistons are CAST.
best of luck anyway running you big boost with no timing. Are you going to use the dual crank triggers, or one and programme in to cam belt stretch to the ECU ?? are you going to use the inbuilt power steering pump??
hehe
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MechaMegloManiac
Registered User
Posts: 20
(6/25/01 8:36:33 pm)
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Re: V8 twin turbo supra
Relax BadBoy,the guy just wants a boosty powerplant,yes,I apologise,they do run 6 bolt mains,I was confusing it with 1 of those silly redundant pushrods.
Big boost with no timing? Where did I mention BIGBOOST? 12PSI is not big.You think theres timing belt stretch?mmm
possibly,but a 32bit sequential system such as MOTEC or
Autronic should circumnavigate it.
I would suggest plugging the "internal" power steering.I dont think it will spend much time in shopping centres.
hehe? why do you scoff? you say you have pulled the engine down,but,where are the engines you put together?Where are the trophies your engines have won?Cheers,
Smuggla.
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BoostRepair
Moderators
Posts: 44
(6/25/01 9:33:36 pm)
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Re: V8 twin turbo supra
no scoffing here, like I said...best of luck
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braydenc4
Registered User
Posts: 5
(6/26/01 9:23:13 pm)
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V8 twin turbo supra
Thanks for the info guys keep it coming. All very valuable. This car wont be a full drag car (not at first). It's going to be a sleek weekend criuser with a lot of punch but the girlfriend needs to drive it every now and again (maybe) so power steers needed. I'm going to be doing a bit of the show circute and I plan on taking a lot of trophies so any shops out there that would like to get in on the build up, by all means, THIS CAR WILL RAISE EYEBROWS!
I've been told to contact surecam to get the info on cam's, heard good things about them.
The MOTEC sounds like the best idea, cant go wrong I guess, but the computer is only as good as the person tuning it. Any recomendations for that job would be good. I will be spending some time near Adelaide soon so most of the work on the car would have to be done there. Thankslots!!!!
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BoostRepair
Moderators
Posts: 48
(6/27/01 1:07:59 am)
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Re: V8 twin turbo supra
Motec or Autronic would be the go. maybe even a twin delco setup with the dual crank triggers.
good stuff happening in Adelaide at the moment, looking forward to seeing your car.
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Toby Hunt
Registered User
Posts: 1
(6/27/01 10:57:05 am)
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Re: V8 twin turbo supra
BoostRepair,
you seem to know a fair bit about the 4.0L lexus v8 - and as i'm now the owner of 2 of these motors (one is not complete) i'm looking around to see what can be done with these motors - forced induction seems to be the go. I can easily source either superchargers, turbos (how a bout a twin-twin charged lexus v8!! - got to be good for about 30 seconds on the dyno with the stock c/r!!) but realistically, i'm looking for info regarding porting, cam specs etc (also torque settings etc -ie workshop manual).
could you please e-mail me on huntt@logica.com, as your profile does not have your e-mail add.
ta
Tob
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BoostRepair
Moderators
Posts: 51
(6/27/01 11:53:49 am)
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twin charging
I actually know of a workshop in Adelaide called Awesome Automotive, that was intending on building a twin charged Toyota V8 4L (eg-2 turbos feeding a 6 or 871 GM Blower. Not quite sure how far he got with it, but I know he had looked into 8:1 forged pistons and o-ringing the block etc.
from what I've heard, the Toyota block is very sturdy incomparison to the new Chev LS1, I was told that most people in the states that are building them for massive horsepower applications are using aftermarket blocks and heads. Not always true I guess, depends who you talk to.
my Email address is boostbrothers@aol.com
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bigdodgedave
Registered User
Posts: 16
(6/28/01 7:44:49 pm)
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Re: V8 twin turbo supra
Hey some of those "silly redundant pushrods" had 6 bolt mains in the 1963, namely the 426 Hemi.
Should I also mention 425 HP @ 5000 rpm factory(vastly understated much like the Nissan GTR). Of course smog laws killed 'em on the street and I wouldn't want to fuel one up on modern petrol at 10.25:1 compression.
Long Live the Dinosaurs.
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MechaMegloManiac
Registered User
Posts: 27
(6/28/01 8:51:08 pm)
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Re: V8 twin turbo supra
"The pushrod is dead,long live the multivalve".
Smuggla.
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jetvl
Registered User
Posts: 198
(6/28/01 9:06:42 pm)
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Re: V8 twin turbo supra
"OH REALLY" MECHAMEGLOWATEVERTHEFUCKYOURNAMEIS..If you think the days of V8s and pushrods are over...your only kidding yourself........JET

BTW go scoff on a dead dogs co.ck you stuckup faggot......JET
Edited by: jetvl at: 6/28/01 9:12:09 pm
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bigdodgedave
Registered User
Posts: 17
(6/28/01 10:17:49 pm)
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Re: V8 twin turbo supra
man that things a work of art.
Long Live the Dinosaurs!! |
MechaMegloManiac
Registered User
Posts: 28
(6/29/01 9:28:24 am)
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Re: V8 twin turbo supra
Big Deal,still only got 1 intake and 1 exhaust valve,still an indirect,unproductive concept,will still try to tear itself apart attempting to make power,thats a pretty picture,is that your engine?did you build it?naaa...thats what you toss over every nite at bed time rite??? yep...got it in 1.
The pushrod is dead,long live the multivalve.
Smuggla.
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MR GT4
Registered User
Posts: 26
(6/29/01 9:42:54 am)
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Re: V8 twin turbo supra
That guy is sitting back, looking at his engine and thinking "@#%$ I'm good" and fair enough too, that is some fine work.
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BoostRepair
Moderators
Posts: 55
(6/29/01 10:45:12 am)
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long live?
MechaMegloManiac, smuggla ??
long live the outdated multivalve(poppet style) and friction causing camshaft setup,
in comes the solenoid control valve (BMW style)
or the Coates 'rotary valve' cylinder head.
www.coatesengine.com
PERFORMANCE & EXCELLENCE
SUMMARY
Many production engine blocks mounted with Coates rotary port-valve cylinder heads have been operated in the original host vehicles to implement extensive tests. For example, one of them has successfully been driven over 150,000 miles and shows many performance advantages. Some proven engine characteristics are listed below along with the best probable reasons for toe observed results.
LOW MANUFACTURING COST:
Far fewer parts in simple valve mechanism
Simple cylinder head
No costly change in manufacturing line of the existing engine block
Shorter assembly time
LOW MAINTENANCE COST:
Simple package to produce fewer troubles
No oil in the cylinder head to burn or leak
No liquid lubrication in any part of the rotary valve
No cooling water in the upper portion of the split cylinder head
LOW NOISE:
Absence of noisy reciprocating valve train Smooth intake gas flows and no valve bounce
LOW PARASITIC POWER CONSUMPTION:
Low pumping loss in gas exchange process
Low power required for rotary valve operation
HIGH EFFICIENCY ENGINE:
High critical compression ratio - No hot exhaust valve
Low parasitic power consumption
Low pumping loss
HIGH VOLUMETRIC EFFICIENCY
Fully opened circular valve ports
Low-temperature intake port
No back flow of residual gas
No need for valve overlap
FLEXIBILITY OF GAS MOTION CONTROL:
Near zero tradeoff problem between gas motions and volumetric efficiency
Fully opened circular cross-sectional port
Staggered variable valve openings (current)
HIGH TORGUE/POWER-DENSITY ENGINE:
High volumetric efficiency
Fewer parts in the engine and simple cylinder head
High thermal efficiency
High engine speed-dynamically stable rotating valve with no valve floating problem
HIGH EFFICIENCY IN PART-LOAD OPERATIONS:
Low pumping work
Use less than 10% power to operate the poppet valve mechanism
LOW KNOCK TENDENCY:
No high-temperature wall, e.g. exhaust poppet valve
Low filling work to the intake charge
LOW POLLUTANT EMISSIONS POTENTIAL
No oil burned in the valve ports
Absence of valve overlap
Low-temperature cylinder head wall
High exhaust gas temperature
CLEAN ENGINE BLOCK AND COMPARTMENT:
No oil leakage from the valve cover
No coolant leakage from the cylinder head/gasket
No need for valve cover ventilation
FLEXIBILITY OF AUTO-BODY STYLING:
Low overall height- Absence of valve cover
No water jacket in upper portion of the cylinder head
Compact and clean engine package
now how good is your old multi valve setup :P
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