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View Full Version : I think I know what Im going to do with the MR2 engine...



Luni
05-08-2012, 07:45 AM
My initial plan as of right now is to run a 5S block, 3S crank, 3S Rods, 5S pistons, for a displacement of ~ 2.1 liter. Thats 5 percent over stock.

Im going to be running a Gen2 head, thats been ported by the guy in Utah whos running a 900awhp alltrac. Im thinking about modifying the head to accept a Gen3 high lift 268 GSC cam like vip09 did.

Mrturrari has recommended custom Arias pistons, once I figure out exactly what Im going to be running (turbo size, etc), so I can have the right shaped valve reliefs cut out so my engine can still be non-interference.

As for turbo, nothing too big. Id say a billet 3071 would be on the high end of big for me. I want a super fat powerband, and I want it to be good for a certain HP range. I also plan to try and do with porting and turbo selection, what I can to maximize the use of stock electronics. If I have to run a standalone, fine, but honestly my goal is to run a romtuned Gen3 ECU that will let me rev to 8k rpm, remove speedcut and fuel cut, and give me a nice healthy powerband. I know this part seems kind of out there, but I think it can be done. Ideally I would build the engine to handle the lean condition that occurs in the midrange in the Gen3 EFI system, that causes the broken ringlands that seem to be so common in Gen3 engines.

Oh, and I plan on running a Gen3 or Gen4 lower oil pan assembly so I have the better oiling system of the later gen motors. If I keep my Gen2 oil cooler, I could also benefit by running 2 oil filters :p.

This is just an initial thought of what I want. I dont have specifics yet. I will hopefully soon.

vip09
05-08-2012, 08:34 AM
Sounds like a plan! I think you will probably need a standalone. I don't think the Gen3 EFI will handle that very well.

Car_Barn_Bandit
05-08-2012, 08:45 AM
Find a used Moroso pan. No biggie.

donteatbugs
05-08-2012, 02:55 PM
I think power fc would be more ideal than a rom tune.

Lonestag
05-08-2012, 04:11 PM
Sounds like it's going to be a fun build, think it will be streetable enough to make it to the Dragon?

Hookecho
05-08-2012, 06:26 PM
CT20b for me?

MrWOT
05-08-2012, 08:07 PM
Wideband w/ narrowband output for the ECU, and a romtune should be fine. If you're gonna spin to 8, I'd do the high lift cams.

UtahSleeper
05-08-2012, 08:09 PM
Sounds like a good plan. Not sure how you could build the motor to handle the lean conditions though. Curious to see what you will come up with.

Luni
05-08-2012, 10:40 PM
Just make the pistons beefy enough to handle a detonation event if there will be one. Make sure the midrange area flows enough fuel to offset what the ECU is doing. I might just be able to add an SAFC and add some fuel in the midrange, which will also make the ECU retard the timing a little to make it even safer in that area. Im pretty sure theres ways around it.

And yes Bruce, chances are, if I get a turbo kit, there will be a CT20b for you :) Maybe Ill trade it to you for a gun.

Hookecho
05-08-2012, 11:10 PM
The gun is already yours. We'll have to trade for sex for the turbo.

The question is do you you want me to gun coat it for you or just send it to you as is and let you have a project. My plan was to disassemble it and sandblast the pieces. Then spray it. That will be much easier than stripping the paint and I get to play with my new sandblaster. I can have it to you in a months time.

Luni
05-08-2012, 11:13 PM
Deal. Although you better be putting out more than you were when your wife was around.

Hookecho
05-09-2012, 12:08 AM
I get embarrassed when she watches us.

alltracman78
05-09-2012, 02:27 PM
Why don't you want a 5S crank, so you can rev easier?

vip09
05-10-2012, 12:33 AM
Luni, in your original post it says you are going to use 5S pistons. If you are using a 3S crank you use 3S pistons. Since you are going to go with an overbore 5S block (I'm assuming 88mm like I did) you need to get 88mm 3S pistons.

KoreanJoey
05-10-2012, 01:20 AM
Custom pistons + custom (Longer) rods. :)

MrWOT
05-10-2012, 02:19 AM
You know, I've been following a professional discussion on rod length for a few years now, and the word from the builders is that they dont worry about rod length at all in a build. Just build around the best rods available.

I've seen countless calculations and charts that show the curve of piston postion/dwell time vs crankshaft angle and it DOES make a difference for sure. But only given a pretty significant change. A change of an inch of more might make a real difference in rod length, in terms of BMEP at high rpm, but after reading I like short rods better for forced induction. Less dwell at tdc at low rpm gives less time for preignition to occur and melt things.

So unless you're gonna add a deck plate to the block, no significant change.

KoreanJoey
05-10-2012, 04:07 AM
I've never really attempted a turbo build. All my thoughts come from NA builds, particularly in reference to 4ags.

donteatbugs
05-10-2012, 08:50 PM
So what your saying is that your still in the 70s when we are in the 80s?

KoreanJoey
05-10-2012, 08:56 PM
I'm thinking Formula Atlantic so 90s maybe...

Luni
05-11-2012, 12:16 AM
Im actually going to be running a Gen3 head now.

Im likely to have custom pistons made from the same guys who made Jeffs (MrTurrari) stuff. They will be matched to the rods, bore, and compression ratio for the stroke based on the crank, etc. Dont worry about that. I just need to decide how Im going to power it. What turbo, what EFI, etc.

vip09
05-11-2012, 03:51 AM
Precision billet 5858 dbb, and some type of standalone

donteatbugs
05-11-2012, 11:57 AM
ballbearing is overrated, 360 journal bearing is almost just as good imo

l0ch0w
05-12-2012, 06:11 AM
so... if hypothetically I knew someone with one like this thats already dyno proven and ready to drop in, would you be interested in purchasing it??? Or are you looking to build this yourself???


Precision billet 5858 dbb, and some type of standalone

The new precision billet turbos spool retarded fast... Ive seen first hand the power of their 6766 DBB CEA turbo... it spools fast as shit... like full boost by 3500 rpm fast...

Luni
05-13-2012, 07:29 AM
Depends Chow Chow.

Most likely the asking price would be too much for my taste all at once, also given it would have to be shipped it would cost a LOT more than what I could do it for locally. And thats also assuming I decide to do a 2.2, which Im teetering on because Im not sure how much I want to mess around with a standalone on.

So it depends on asking price for the thing, and the details around teh build for sure. Go ahead, humor me. PM it if you dont want it public.

KoreanJoey
05-14-2012, 12:46 AM
Dude, why would you build a motor and rely on the OE computer?

Luni
05-14-2012, 03:20 AM
Because it works.

The Captain
05-14-2012, 11:42 AM
He likes air conditioning?

Luni
05-14-2012, 06:54 PM
Standalones can run AC too, but I dont mind making the power within the constraints of the Gen3 EFI system. Im beginning to think my build goals may be a tad too lofty.

Maybe not run a stroker, just put some good pistons in a 3S block (prolly still go with the custom Arias ones MrTurrari recommends, or maybe some Ross, like Bugs uses, or whatever), Run the Gen3 oil pan assembly, (maybe find a blown gen3 block and just build it like Brian did), and run it on a Romtuned Gen3 ECU like a Mines or something.

Ive seen several guys in SLC have perfectly streetable fun to drive, 315-330whp MR2s that have been running on stock electronics. I may just go that route. I dunno.

UtahSleeper
05-14-2012, 07:16 PM
I would say get her back on the street. Which ever path does that the quickest, do it!

The Captain
05-15-2012, 12:08 PM
Standalones can run AC too, but I dont mind making the power within the constraints of the Gen3 EFI system. Im beginning to think my build goals may be a tad too lofty.

Maybe not run a stroker, just put some good pistons in a 3S block (prolly still go with the custom Arias ones MrTurrari recommends, or maybe some Ross, like Bugs uses, or whatever), Run the Gen3 oil pan assembly, (maybe find a blown gen3 block and just build it like Brian did), and run it on a Romtuned Gen3 ECU like a Mines or something.

Ive seen several guys in SLC have perfectly streetable fun to drive, 315-330whp MR2s that have been running on stock electronics. I may just go that route. I dunno.
Sounds like a winning combo to me. Question is, will it be ready for dragon 2013?

Azzazzyn
05-15-2012, 05:11 PM
Sounds like a winning combo to me. Question is, will it be ready for dragon 2015?


fixed

CriScO
05-15-2012, 05:49 PM
fixed
Answer is still no.

Luni
05-15-2012, 05:51 PM
Sounds like a winning combo to me. Question is, will it be ready for dragon 2013?

Chances are, yes it will. But Im not sure if I wanna ship my car there, and Im fairly certain I dont want to drive. But maybe I do. Dunno.

UtahSleeper
05-15-2012, 06:03 PM
Pretty sure you could make a fun drive out of it!

The Captain
05-15-2012, 06:41 PM
Chances are, yes it will. But Im not sure if I wanna ship my car there, and Im fairly certain I dont want to drive. But maybe I do. Dunno.
Put a playstation in it with Gran Turismo. Then you can drive while you drive.

Hookecho
05-15-2012, 07:39 PM
All of that driving would take the fun out of the vacation.

Luni
05-15-2012, 08:24 PM
Yeah, Im fairly certain if I did it, Id ship the MR2 to the cappy.

Luni
05-15-2012, 10:21 PM
Well, different path. I ended up buying a good condition Gen3 that has had all of its maintenance done, seals, water pump, timing belt, etc, in addition to GSC S1 Gen3 high lift cams, and ATS adjustable cam gears.

I just put down a 1k deposit on it. The engine is really nice. Everything on the thing has been powdercoated, and it comes with everything I need to just slap my engine harness on and run it.

It was 1900 dollars. Hell, the cams and the powdercoating alone was ~800 of it right there. And its local. And Ive driven the car it came out of, and that engine runs good and strong.

UtahSleeper
05-15-2012, 11:04 PM
Nice!!! Didn't even know anyone around here had a gen 3.

MrWOT
05-16-2012, 01:47 AM
Nice find

The Captain
05-16-2012, 02:20 AM
It's only money. You'll make more.

donteatbugs
05-16-2012, 03:15 AM
its only hookers, you can do without them

Luni
05-16-2012, 06:13 AM
Nice!!! Didn't even know anyone around here had a gen 3.

Ben Neil always knows where a Gen3 is.

Do you have any use for my MR2s old engine dude? Ill pretty much let you name your price on it. Theres nothing wrong with it other than a few oil leaks, and one of them is on the turbo oil line, so youd need a new gasket for that anyway.