looking at getting a ma70

[wildplumdx]

looking at buying this ma70 in this link here http://www.trademe.co.nz/Trade-Me-Mo...n-57599664.htm but unsure on how they handle psi on standard internals as i emailed and asked what do you guys think ?
adam

[bgrieger]

Oh, somewhere in the 500hp neighborhood before you have to be concerned. Some have successfully gone more, but most find this to really be the point of no return.

[wildplumdx]

oh wow so they are a strong engine! would you say even stronger then the rb20det ?

[SuprAdam]

Most definently a strong engine.

The crank will take anything you can throw at it (1000+hp).
The rest of the stock bottom end pieces have been dynoed to 800+whp, how well that will hold on the street is another story.

Like already mentioned, the general "safe limit" is the 500-600whp range. Of course this is after adding a MLS head gasket and good fasteners properly torqued.

[wildplumdx]

how much psi can they handle on stock internals ? did u check out the one i'm keen on ? would it be fast ? as there a heavy car ? are they underestimated cars?

[SuprAdam]

You must be new to turbo cars

Don't measure anything in PSI, ever.

30psi on a ct-26 vs. 30psi on a t88, not the same thing.

Go by CFM or lb/mins, and even then the motor will probably be able to take anything you currently throw at it.

If you "must" go by PSI, I have seen 26psi on a SP63 on a stock 7m and it was fine, as well as 27psi on a PTE67, and 24psi on a GT42R, all stock 7m's and they were fine. Each of those is well over 500whp.

Very stout engine when tuned correctly, but don't do crazy power on an old engine. Rebuild.

Edit: that is not an MA70 in the ad, says it has 1ggte, which makes it a GA70, little 2.2L engine I believe, or maybe 2.0L, no idea about that engine.

[repinS]

1G-GTE is 2.0L. I've heard of them making good power, but as for upper limits on stock internals... no clue.

[wildplumdx]

oooh right so the whole 500hp is for the ma70 not the ga70 gutted maybe i should wait for a nice ma70 to come up ? but over here in New Zealand the ma70's never come up for sale! where the ga70's theres atleast 10 for sale anytime! so for parts etc the ga would be a wiser choice just need to find out how strong the 1ggte engine is! does it live up to its big brother 2.5 ? and yea i'm new to turbos never owned one ! also do the ma and ga gearboxes the same ? whats the 3L turbo engine like even worth looking at ? cheers

[repinS]

I don't know too much about it, but I've always been kind of attracted to the 1G-GTE. Though I think they're a little more at home in a lighter car like a GX70 Mark II/Chaser, as opposed to the tank-like xA70 chassis.

[bgrieger]

check the parts availability in your area before deciding. I've never seen much available for the 1G-GTE that was not custom made. Perhaps your local scene has more options.

Torque is the problem with the engine...like RepinS said, 3800lbs of car needs some grunt down low to make it move, and you won't find it short of 3L (IMO of course, but I believe the 1J is inferior due to poor low rev response in the supra too...others disagree).

[TcmaBoy]

I agree that the 1JZ doesn't have the low end that the 7M does. The under square layout combined with the extra half liter makes a difference, but I think the over square layout on the 1JZ makes it a bit happier at higher RPM. For a daily driver that lives below 3500 or so the 7M is the way to go. For a race motor I would go with the 1JZ. I am not sure why the 1GGTE was an option in the Supra. The 1JZ is undersized as it is.

[Jeeves]

From everything I've heard about the the ga70's (which were powered by the 2.0L 1G-GTEU), they are ball-less.

The problem lies in the fact that it's trying to drive a 3500lb car. Even stock turbo'd, 206hp/202tq just isn't enough to make the car move fast. It (2.0L/1G) was an option due to taxation laws. The motors are rare, as they're costly to make power out of, and it's simply much easier and cost effective to upgrade to the 3.0L 7M-GTE, or go wild w/a 1JZ/2JZ project.