For hp goals of 350whp, I think the t3/t4e 50trim is prob most econimical route. I prefer the .63ar housing. You'll prob need bigger fuel injectors too, you'll be cutting it close on duty cycle if you do hit 350whp. Also, on the d-series, a head job makes a world of difference once you get into the 350-400+ range.

On my old vitara build, I made just shy of 400 w/ the 50trim and .63ar housing.

As for meth, I was one of the guine pigs w/ the Devil's own kit and it was OK, but overall if your goals are in the 300-400 range, I found it best to just run race gas. I like the K.I.S.S. rules.

A wire wheel shouldn't harm the valves at all and is the easiest way to knock off carbon.

Be sure to check the piston to wall clearance before throwing forge internals in and compare it to the forged piston PTW clearance specs.


There is always a compromise between power and spool for a given displacement and choosing turbos, but a small'er' turbo being pushed a bit harder tends to give a broader and more entertaining powerband, especially if the fuel can support the higher temps associated.

300whp 14bs aren't all that "typical" and 375 isn't too likely at the wheels for almost any setup DSM setup even on more exotic fuels. Thats a 34 ish lb/min turbo being pushed pretty far to the right of the map.

With boost... i started out just like most everyone else back in the day, small turbo and dsm 450s... but you know its too addicting, you won't be happy until you have too much power to drive on the street. Do your self a favor and just get something that'll support 400right off the bat. :)

Its a DD and I'm wantin to keep it street able. I have a AWD DSM I'm buildin to around 500whp it will be my fast car when I need more power. They will do 350 at 90% - 95% duty cycle. So I think i can get 300 to 325 out of them at lower duty cycle. I can always upgrade if I need to. My spec sheet that came with them said to set min clearance at .003-.0035" and for turbo apps add .001-.003" more clearance. Right now my pistons measure 2.951 and my cylinders before being hones are at 2.953. So i have plenty of room to do a slight hone job on.

If you bump the fuel pressure up a bit, you'll be able to get a bit more out of those injectors. though it's not recommended to push an injector above 90% as that leaves no room for safety should it suddenly need more for whatever reason. 75% duty cycle at peak hp is ideal for most setups. You may want to run bigger injectors if you plan on pushing much above 300whp. It's also not a very good idea to crank the pressure to compensate for under-sized injectors...

We're running DSM's in our MR2. at 240hp and 13psi, we're at 75-80% duty-cycle which is getting close to the edge, imo. Though we were still running the stock fuel pump/pressure for the 4agze. We're building a new engine for this coming season and plan on running 20psi+ (about 300hp) and will definitely be upgrading the fuel pump and injectors. Probably 550's or so...

Man setting these ring gaps are tedious. 0.017, 0.019, 0.021. Bore is set at 2.955 with a PTW of 0.0040-0.0045. I set the PTW according to JE's paper work that they sent with the pistons. This was also verified on their website. 0.0030-0.0035 plus 0.001-0.0030 for turbo, supercharged, nitrous, and endurance vehicles. As soon as my buddy drops my ring compressor back off I will be installing pistons and rings. Already clearanced the block for the rods today. Honed the cylinders got a nice 45* to 50% crosshatch. Recleaned the block after notching and honing were done. Been a long tedious day today.

Here is a link to the pics of the build thus far.
Delsol pictures by worpedteg - Photobucket

Damn, those are some beefy rods... lol

Lookin' good so far! :)

yeah alot better than what was in there. Thanks man. Waitin on my buddy to return my ring compressor so i can finish the bottom end. New valve is supposed to be in anyday.

Got the bottom end assy waitin on my gasket set to get here. It is supposed to arrive on wed. Along with my HKS EVC-S. My have a set of ARP head studs bein shipped out tomorrow.