st 204 turbo Options

[thorshammer]

Hi I have a st204 Celica with 5fse engine and am wanting o turbo it. I have read 1bwilson's and Shid's posts on turboing a 5sfe and list of components needed and this seems to be the best way to go. In my neck of the woods CT26 turbos are hard to come by, T3/T4 turbo is easier to sourc.e My question is what T3/T4 do I need and other than a CT26-T3/T4 adaptor is there anything else I need. I live in Australia so Mustangs and other American cars are not common here but plenty of Japanese sources. Thanks

[lagos]

Hmm so its the 93+ that is different. I haven't seen the insides of a celica distributor for a while, so Id love to see a pic of how it compares of someone feels like throwing one up.

This one is from an early 90s 5sfe mr2. Its exactly the same as my 3s one. I wonder If this distributor could be swapped over for 5s guys (not because its better, but to ease installation).


I mentioned "might be able to work", because my 3s didn't want to start with just an NE signal (with sequential injection). Once I managed to get both a crank and a cam signal from the distributor, the setup has worked flawlessly. The car starts up faster than the stock ecu, and overall runs better and smoother than the stock ecu ever did.

I think the DIYPNP is great because its a smaller box, easier to solder, comes with pnp connectors and has the LM conditioner built in should you need it. The standard MS2 is also a great way to go (and I think cheaper as well), but I personally wanted a solution that would work out of the box with my stock distributor.

I have one of those. Initially, I was going to go with that distributor and a Chrysler 420a dual tower coilpack. I have a friend who assembles megasquirts and he setup a pre93 distro onto a post93 MR2 5S with the 420a wasted spark coils. He ran semi-sequential injection with that distributor.

The MR2 was on MS2 and he modified the trigger wheel to make it a 24-1 so that he didn't have to use anything but the MS2's native trigger wheel decoder. It ran good and solved the previous issue it had with the stock 5S distributor. However the semi-sequential injection never worked properly after trying different settings so it went back to batch fire.

That same MR2 now has the trigger wheel I gave him, the OE sensor and a 98+ oil pump on there, and it's running full sequential injection with 0 issues, with wasted spark 420a coils. He was looking to set it up with a different coil pack but it's running fine on those ATM.

The newer 98+ camry engines should have a cam sensor and a different cam sprocket with a tab on it. They come set up for sequential ignition and injection, but Toyota decided to use wasted spark ignition and I believe sequential injection.

So once your friend swapped over to the pre 93 distributor, he had to modify it by shaving off one of the teeth to get that setup to work with MS2 because the G1/G2 signal wouldn't pick up, right?

I think there is a difference in how that whole circuit is run between the standard MS2 and the Diypnp PCB boards. The DIYPNP has a circuit for adjustment of the signal coming from the distributor, is there such a thing on the standard MS2? I believe that on Toyota distributors, the problem isn't so much that there is noise or anything that needs to be conditioned. Its more of an issue with the signal being fairly weak and needing adjustment to get picked up. I know that that this has been an issue for years, and it was one of the things that kept me from installing ms2 all these years (I wanted a plug and play solution).

I originally really struggled with getting mine to work, as it didn't want to work even with the pull down resistors the DIYPNP uses. It wasn't until I switched from g1 to g2 cam pick up that the entire thing starting working correctly.

This is some good info btw. Id like to really know what can/can't work with the 94+ 5sfe when it comes to megasquirt.

I'm not entirely sure but I believe that he did it not because he was having issues but because he knew it would work like that. He ground the tooth off prior to re-configuring the setup.

I can't answer that question regarding the circuit for adjustment of the signal, as my knowledge on the circuitry aspect of the MS is limited in some areas. I didn't build mine, nor will I build the MS3X. The same person who built my MS2 will build the MS3X I am going to be running. I don't remember seeing anything for adjusting signals coming from the VR sensor other than a potentiometer that could be adjusted in order to get a (cleaner?) signal going through the RPM circuit of the MS2. It might be that, but I'm not sure.

Yeah, he did it because it was a very common issue and grinding off a tooth was a recommended solution to get things working in the early days . The DIYPNP now has the adjustments needed to get it working with the stock setup on the 3s (and maybe even the 5s) distributor without modification. They ended up using the DIYPNP as a basis for their MSPNP that they officially sell for the 3s.

You should really solder your own board. Its not hard at all and kind of a fun project.

This post has been edited by lagos: Jul 9, 2013 - 1:55 AM