Bulletproof 7MGTE (teh p00 motor)

[whatthe?]

Ok,

As some of you may know I am currently untertaking a MA61 7M conversion. What you may not know is that getting the engine in and running well at 200-250rwkw (99% done) is only stage 1 of the project, hence the reason I have been rushing a little to this point (as I have about 4 stages planned).

Stage 2 I can now reveal is to create "teh p00 motor from hell" and after a not inconsiderable amount of research on the engine/problems/pros/etc I've decided to throw it open to the group. I know I could just go 2JZ and it may be cheaper, but like BVD I now feel some allegiance to the much maligned 7M and wish to shove the results in the nay-sayers faces.

I have a spare 7M sitting in my garage (courtesy of crownman) awaiting some lovin'. I have some ideas on turbo selection, pistons, rods, bottom end etc but what can those in the know here suggest? Any ideas welcome. Feel free to go a bit silly, 400rwkw is the goal. Turbo and manifold selection needs to be limited to that which will fit an MA61 engine bay, a hurdle that I'm struggling to overcome at the moment (ie: not much room there once an aftermarket manifold comes into the equation). Can anyone recommend machining shops that make custom manifolds? Any other suggestions and tips appreciated

Thanks,
Matt

[TheStitt]

Talk to Jas (yellow Rolla) bout the custom exhaust manifolds.

His machine/ welding work is awsome

I also like your thinking I would also like to build a Tuff 7M but I don't think the wagon is a worthy candiate or it might be I'll see what happens.

[Norbie]

The MA61 engine bay has more space than the MA70 (especially width) so you won't have any problems fitting an MA70 turbo kit of your choice.

[ed]

heaps of CHEAP hks and blah blah brand manifolds on ebay, cheap cheap

its very easy to build a honking good 7m for little cash these days

[bbaacchhyy]

Have a look at SupraMania.com and in particular IJ (it is I as ain Ian) and he is a Melbournite building a mega motor so ttrawl through his thread (currently at 130 pages) about what he is doing/has done

Cheers

Michael B

[whatthe?]

Don't really like the look of the "blah blah" brand manifolds on ebay, willing to spend more than theyre asking for those to get something decent. There are a few good deals going around on 2nd hand manifolds although I guess they could be a little iffy as well. Custom made exhaust manifold and plenum was the original plan, just have to hunt around and see who does what for what $$$ and how good they are. Also have to decide on a turbo first I guess.
Anyway, thanks for suggestions guys, keep em coming! I will of course add photos to my car thread as I go for those interested (after I update it and put it in club members rides). Cheers

[gianttomato]

If you have the money to upgrade to a custom exhaust manifold, by all means do it. Jas' work is beautiful. That said, good power can be obtained with the standard manifold. Just use an adaptor plate to mate the new bigger turbo. The name brand manifolds on ebay are just fine too - remember, these have been the basis of many big horsepower motors in the past.

Probably would recommend a front facing throttle body if only to reduce the amount of piping from the intercooler in order to reduce lag. Standard thing seems to be to adapt a 2JZGTE intake manifold. This will generally necessitate relocation of the altenator depending on how you do this.

Then you have the usual stuff regarding rods, pistons the assembly and that all important head gasket. Don't use Total Seal gapless piston rings. There are other more fiddly issues like the hone pattern to use otherwise it will use copious amounts of oil - something to do with the metal composition of the block. Don't forget a decent computer - this is as integral as the forged pistons.

Ian's donk will be quite something.

[BlackSupra]

The hks exhaust manifold is merely a cleaner and neater version of the stock manifold, but it sure is effective at making power.

They suit the T04 flange, but i have an adapter to run the Trust TD07s on mine.

I must say i would like to have a go at 400rwkw too, but it comes down to turbo selection. I reckon mine will run out of puff! You are going to need something special to make those numbers and be prepared for a lag demon!

Haha, i tend to question your 550cc upgrade now, you will require 720's at least.

You will need to run MAP sensored ECU to remove the lexus AFM as well.

You will probably need to get your exhaust done again, i will tell you how altering mine has effected the power delivery when i get it on the dyno again.

But unlike the 1JZ, its not all bolt on and 'have 350rwkw love'. One will need to split your p00 open and work on the insides. I hate to think how much $$$ has gone into a built 7m!!!

Oh and yes....budget lots and more then lots more than you expected!

[CrUZida]

As above, you'll be pusihing 400rwkw on 550cc injectors.
Go for bigger.

[BlackSupra]

i would go so far as to say 100% zero chance of making 400rwkw on 550's.

And even trying to get close would be at 100% duty cycle.

[gianttomato]

Assuming 100% duty cycle (bad idea), 550 cc/min x 6 = 3300 cc/min total fuel delivery. Divided by 5 gives roughly 660 crank hp or 490 crank kW. By the time you factor in driveline losses, you're mighty close to 400 rwkW.

You could increase fuel pressure but remember that doubling fuel pressure only results in the flow rate increasing by a factor of 1.4.

Seems the smart money is on 720 cc/min injectors. For the same power, your duty cycle will be around 76%.

[1200det]

Ive seen 550cc make 500 or so crank horsepower at 80% duty cycle so 720cc should support 500 to 550 Rwhp

[gianttomato]

500/660 = 76% duty cycle so still OK

Probably want to keep duty cycle below 80%.

[whatthe?]

The 550s are in the 7m that is in the car atm. I figured bigger jobs might be on the cards for the new motor so thats all cool, the hunt shall begin! Thanks again for the advice, I'm taking notes! Can anyone recommend a specific turbo for this application? There seem to be plenty around rated to this sort of power, but obviously some will be better than others at avoiding the "lag demon".
GT, thanks for that advice on block prep etc. I'd never heard about that honing pattern problem so I'll be sure to ask question when the time comes.

[whatthe?]

Oh and new computer and losing the afm was at the top of the list Glen!