Kwanza, Nik, MR2Swift I need your help..., Same stupid questions... Options

[doGGy]

The idea:

Got ahold of MR2 4AG Blue top Engine.. Everything is included,then i mean everything i mean everything all the sensors and etc... it is from my friend car, and it was sitting tin his garage for ever, so he desided to get rid of it.. 150$ for it was too fair so im getting it....

The bottom end has some problems but i dont even care, as long as im on the route to convert it to 7AGTE...


The main Question:

Wiring is MAP based, it has all the sensors and etc etc... BUT, im going with Megasquirt and im going with 4 ignition coils (direct ignition from peugeot). Question - what else i should need to make the engine wiring work propertly with this setup?

Optional Question:

Is everything Bolt on with the 7A and 4AG head? power steering and etc? (i dont have air cond so i think this aint a big problem)...
What CR i should get using 4AGZE pistons in 7A block and using 4AG head? I knwo what ignition chamber on 4AG is more flat so less volume and as long as with 7A head i get the 10.8 CR what should i expect witht the Blue top head?

Thanks guys, i really need some info quick, cuz i need to make the desidion about this setup - is it worth all the hastle....

[FallenHero]

Mr2 always used the blue top and the supercharged used the small port head. The 4ag has a FAR more domed combustion chamber Vs. the 7a. Your compression will drop dramatically from the 7a-4a head. I'd just use a stock gasket. if you are using 4ag pistons, the compression would probably be around the stock 8.9:1 (unless they are early lower comp pistons)

either way I would use a strong gasket, even if it's the stock size... I know boost hunger.

If you are loosing the 4ag ECU completely you will need megasquirt and spark. It's kinda a goofy looking set up (big sensor set up on the crank) but it works like a charm. There is a guy on club4ag that makes pre-assembled plug and play megasquirt and spark ECU's that are tailored to whatever settings you want. He is relatively cheap, and you can use your stock wiring. Even if you want to build the set up by yourself, he woudl be a good person to talk to in case you have any questions.

My only problem with megasquirt is what is going to run all of the little parts of the car the ECU is tied into. That is why I'd never run one on my daily driver. Some people love them though, I just don't have the experiance. Club 4ag has lots though. My advice, make a visit or two.



That is the head from a 4ag formula atlantic. It's milled down and still has more of a combustion chamber than a 7a.

This post has been edited by FallenHero: Mar 23, 2005 - 12:31 PM