calling the na-t guys, need some help.

[Alpinesupra]

hello all, :1zhelp:
few of you know me personally and from the forums (sm/sf) but i need some help from you guys.
im getting ready to do a small na-t build for my girlfriends 89 supra which has blown the hg, with my car i did the whole swap itself na-to-turbo everything so im trying to learn the na-t builds, and yes im reading the faq sections and printing everything to go back to if needed.
here is what im doing for her, no more than 350rwhp, she currently has (parts to be used) titan 1.4mm mhg, arp head bolts, 3" ddp, 54trim ct26, ngk gte iridium plugs.

my questions are......

-how much boost will the stock afm hold before it hits fuel cut?
-will the distributer be a problem with spark? with upgrade wires.
-how much hp will that stock tranny hold?
-will it be a problem running the stock 9.2:1 compression at 10psi on pump (93 octane)
-will the 1.4mm mhg be ok or should i up it to the 2mm to lower the compression some?

i think thats it for now, thank you for anyone willing to help and that can answer my questions and any extra info that can be provided would be awsome.

thanks
-sean :icon_bigg

 

[CRE]

Well, the first thing you need to answer is what size injectors you plan on running.

The dizzy won't be a problem, spark gap is where you may need to make adjustments.

Naturally, I wouldn't run the car without a wideband and a fuel controller. I wouldn't even bother with keeping the VAF, others have but I just don't trust it for boosted applications where more air is going through than it was ever designed to meter.

The W58's good up to about 350RWHP *IF* it's in great shape to begin with... beyond that they like to make interesting sounds...

I'd run the boost lower for a while to make sure the engine's up to the task.

 

[Alpinesupra]

stock gte 440's for the injectors. and i can only boost as high as the wg and 3" exhaust lets me.
this isnt going to be a huge build, just very minor things mainly kept stock and made to look good.
keep the help coming.

thank you
-sean

 

[Alpinesupra]

no help anyone??
gee thanks glad to know these forums here are better than sf (roll eyes)

-sean

 

[IJ.]

CRE answered all your questions Sean, would you like different answers?

 

[Alpinesupra]

CRE answered all your questions Sean, would you like different answers?

well yes, sort of.
id like to get everyones input basically.

i didnt want to go through the trouble of doing a 2mm mhg and swapping in the GTE electronics, like i did mine, i just want to keep her a simple daily driver with a couple bolt ons nothing major as i plan.

im still unclear how much boost can be run through the stock GE afm with 440's without running into fuel cut.

thanks
-sean

 

[IJ.]

I'm not sure you'd run into Fuel Cut using the NA AFM/Electronics ever?
(It has NFI what + pressure is fullstop)

I think you'd drive over the crank waiting for it to cut.
(I'm sure someone will correct me if I'm wrong)

 

[CRE]

7M-GE + upgraded turbo + stock electronics != reliable daily driver.

I don't know if you'd hit fuel cut with the 7M-GE ECU either... academic really as you'll probably peg the vane LONG before the ECU could ever read that there was enough air coming to meet the requirement. People have run it in blow through to somewhere between 8 and 10... of course I think that's half the reason why the car never runs longer than a couple months and they finally say the hell with it and do a swap...

You are going to be installing a fuel controller and a wideband... right?



The short of it... you're just begging for trouble and one seriously pissed off G/F without a car.

 

[Alpinesupra]

You are going to be installing a fuel controller and a wideband... right?


The short of it... you're just begging for trouble and one seriously pissed off G/F without a car.

i dont plan on doing it to hers because i only plan on having this thing run 8-10psi, however now that you've mentioned it would a vpc/gcc combo work on a na ecu?? because i currently have that on my car and when i swap to a standalone (hopefully soon) i could just swap that combo over to her car if it works that is.

and she has a is300 for a daily daily drive, the supra is current in bhg mode and once fixed it'll be the daily car that she can take whenever the hell she feels like it.

thanks
-sean

 

[iceberg319]

a while back i read that you could use a vpc with a NA using a mr2 rom (uses afm, and same sized injectors but 2 less cylinders), never verified it tho.

id still run turbo electronics because it has timing and fuel maps for boost

 

[ndp7486]

id still run turbo electronics because it has timing and fuel maps for boost

+1.

you dont need a car thats going to be nice for a month or 2 (if that). how would you compensate for the changed compression of a thicker head gasket, how would you measure the compression? just replace the head gasket and keep the car n/a. otherwise youre going to end up spending the same amount of money that a 1jz swap would cost. a supra is a supra and it holds respect as one of the most advanced cars of its time for every year it was manufactured, regardless of its output. now think about it and ask yourself what you would rather have. this isnt a subject to be taken lightly and requires alot of detailed planning if you want to do it the right way.
read every work on this writeup. its one of the best out there. it should answer nearly every question you have about turboing a 7mge, and the mistakes of doing it the wrong way.
:icon_razz
http://www.supramania.com/forums/showthread.php?t=34560

 

[viper92086]

swap those turbo electronics over there pronto. my car has been na-t for quite a while like this

 

[ndp7486]

your car is so nice