400 HP possible?

My plan is to do a 3 cylinder per turbo approach with cusom fabricated intake and exhaust on an EFI. I was thinking of using Wiseco 3.425" bore forged pistons and a set of K1 4340 H-Beam Billet connecting rods. is this a reasonable build? And no, I do not plan on putting nitrous in this car. So, yeah.

3cyl? What block do you plan on useing?

Geo Metro was a 3 cylinder. 400hp in one of those would be bad ass.

225 Slant six. By what I said, I meant like 3 cylinders per each turbo. like each turbo handles 3 of the cylinders exhausts and forced induction.


Its gonna be in a 2 door dart swinger

What is the center to center length on the K1 rods? Are the pistons for a slant or are they meant for a 2.2L 4 cylinder? Never much cared for turbos myself. They take too long to start making power. Your idea should work if you can find turbos small enough. They will only need to boost 1.85L each. 10-15 pounds of boost will get the power you are looking for with no problem and the slant will take that all day. When I get tired of my current setup a small Rootes blower will take it's place, so I'm with ya on this. 8)

They are stock 225 length. 7.005. they are meant for the slant. they are forged flat pistons by Wiseco

anyone have any suggesstions on a good EFI for the good ol reliable 225?

I'd go megasquirt good opportunity to build it yourself and learn/understand all of it's functions.. relatively cheap too.

My plan is to do a 3 cylinder per turbo approach with cusom fabricated intake and exhaust on an EFI. I was thinking of using Wiseco 3.425" bore forged pistons and a set of K1 4340 H-Beam Billet connecting rods. is this a reasonable build? And no, I do not plan on putting nitrous in this car. So, yeah.

400 hp would be very easily achieved in this context.
I have no doubt. Have tyou seen some of the 6s running around out there?

@Nick M: Thanks for the suggestion. =D. Ive heard quite a bit of chatter about the megasquirt efi system. I know its a good system to run 10 lbs of boost or less on. But what if I decide I wann go for 15lbs of boost or 12.5?


@Dakota: I've seen some, I saw one a while back with a Garrett T4 style GT440R turbo on a pull through setup on an IC. If I am correct, it ran a low 10.

I don't recommend the Wiesco/K-1 rod combo, unless you have had a lot of turbo experience. That rod and piston combo will give you over 10-1 CR with a 225 crank. The rod at 7.001 is the 198 length, which puts the piston up higher in the cyl.

Grump, if the turbo is properly sized for the engine, lag is mostly non existant. My old turbo slant, which is totally obsolete by todays standards, would get 2 lbs on the starting line, and 12 lbs at the tree. There are several slants making over 400 hp, one at over 600 in a street driver on pump gas.

So, what pistons and rods should I use? Would the wiseco's still be good? I havent really heard anything bad about wiseco pistons.


And arent the rods just .002" longer than the stock rods?
The 198 engine has the longest rod with a center-to-center distance of 7.006" and is PN 2951262. The 225 rod (PN 2406657) has a center-to-center distance of 6.699".
Came off slant-6.org

Stock 225 rods are 6.7 inches long. The K1 rods are 7 inches long. That's a difference of over a quarter of an inch which will put the top if the piston above the deck surface. Have to agree with you on Wiseco pistons though. Good pistons and great service. Try their 2.2 Turbo pistons if you want to use the K1 rods. You'll have to do a little more boring than you planned on but the block will take it.

Try their 2.2 Turbo pistons if you want to use the K1 rods.t.

Check the compression distance, on the 2.2 turbo piston. I think it close to the same as the piston with the wiesco/K1 rod package. If so, it won't work either.

Keep us posted on what setup you end up with and how it runs, I have a 225 dart and I've been looking at V8's cause of the power potential, but if you can get 400HP in a slant and still have it running off pump gas and use it on more then just the weekends, I might just bring that slant into the 21st century.

I had a set of forged Wiseco's made to fit the K1 rod. S/b around 8:1 comp ratio. 1.455 comp height. Part # ASC-01148

It is really a duplicate of a stock piston with the comp distance moved to accomodate the 7" K1 rod.



http://farm4.static.flickr.com/3067/2693791825_f607a4cc8c_b.jpg

that is very nice, how much did the whole set cost, pins and all?

still, lower piston rings as well will also help to decrease chances of detonation (knock)

$730 shipped. With rings & pins.

Very nice, I think I found my piston-rod combo. Thanks Shaker! Do they run really well? and how much is your slant making?

I have not run them yet...I'm starting assy in April.

The stock engine made 450hp (crank) with 30psi.

http://www.youtube.com/watch?v=GMwcDlJGss0

I'm guessing you are or were running a single turbo setup?


@HIR: Ill sure be running it on more than weekends, more than likely every other day and itll def be pump gas. Im mostly gonna hand-fab quite a bit of parts. =]

The megasquirt can be orderd/built using a 2 bar map sensor, high boost levels should not be a problem with this system. I was planning to use it on an SVO mustang i had, never got the chance though. Seem to remember a lot of guys over on the turboford site running megasquirt good info there.

*bump* anyone have any other piston/rod combos?


I aim to get a pre-76(?) 225 with the forged crank, thats correct right? or is it pre-72?

60-mid 76 for 225 forged cranks.

Well DarTT, it's always bothered me that with all the displacement the old mopar engines have, they make such little HP compared to the new engines. I have zero turbo experience, but if I can have my daily driver putting down anything over 350 HP with my original /6 under the hood, I'm ready to follow in your footsteps. Like I said, just keep me posted.

Well DarTT, it's always bothered me that with all the displacement the old mopar engines have, they make such little HP compared to the new engines. I have zero turbo experience, but if I can have my daily driver putting down anything over 350 HP with my original /6 under the hood, I'm ready to follow in your footsteps. Like I said, just keep me posted.

It's all in the head. That's where it happens.
Mopars arent blessed with a great flowing head from the factory.
I have seen some slants around here that to say the least are scary.
The one good thing about Detroit is there is no shortage of awesome cars and slant 6s included.

hitting 350 hp will be very easy and reliable!

(reading the first post) twin turbos seem a little overkill, you can only force so much air into the motor, you might be better off with just a single turbo. twin turbos are only very effective on v8s or bigger engines....

(reading the first post) twin turbos seem a little overkill, you can only force so much air into the motor, you might be better off with just a single turbo. twin turbos are only very effective on v8s or bigger engines....

Ever hear of the RB26DETT??? First engine to reach a kilowatt of power. And guess what it is? an inline 6! and whats the bore? 26mm? Should sound familiar to any slanter here.

Its a 3-1 setup. 3 cylinders per turbo. and im not mounting T4 style turbos, so no overkill here.

And if you know your s*** about turbos you should know a smaller engine responds BETTER to turbocharging. And that twin turbo eliminates lag as well as providing better exceleration response.

Also, this project is to do something different that hasnt been done before. Ive seen 70000000000000000000 TURBO SLANTS with epic turbo lag made up for by nitrous and running like 37 lbs of boost. But no twin-turbo slants. And I disgust NO2

I was talking with the Wiseco reps at PRI - you can special order the Wiseco / K1 combo in any compression ratio you want, and it's not all that much more expensive that way.

I was talking with the Wiseco reps at PRI - you can special order the Wiseco / K1 combo in any compression ratio you want, and it's not all that much more expensive that way.


Thanks Mat! :cheers:. I really hope to see a bunch of slanters at the slant race. if it happens =/