NA-T Maft Pro

[dumbo]

OK, i'm doing the 86.5 NA-T with GTE Electronics, and a maftpro with the MAP sensor. i'm going with 550cc RC injectors, CT-26/57Trim, will i be able to use the piggyback ecu to adjust for bigger injectors??(i know i can adjust afr) and i CAN'T adjust timging(thought i could) so will the GTE ecu make up for it? or should i retard it a bit to make up for the higher compression?

please any help/advice is munch wanted(and prolly needed) she's gonna go under the knife in 11 days, so i will prolly have more questions and i guess i'll start a build thread so people can learn from my mistakes:nono:

thanks again guys:icon_bigg

Since its a na-t, i think i'm in the middle for the right forum to post in.

 

[CRE]

Why can't you control the timing?

Yes, the MAFT Pro has plenty of room to tune for those injectors.

I would pull a little more timing myself, although the GTE's timing is (from what I've read) a little conservative. I'd still pull some, especially when running an upgraded turbo and presumably more boost than stock.

Are you running a stock HG, metal HG big enough to make up the difference for machining or a stock sized MHG with no consideration for machining (hence a higher compression then a stock N/A)?

 

[dumbo]

Why can't you control the timing?

Yes, the MAFT Pro has plenty of room to tune for those injectors.

I would pull a little more timing myself, although the GTE's timing is (from what I've read) a little conservative. I'd still pull some, especially when running an upgraded turbo and presumably more boost than stock.

Are you running a stock HG, metal HG big enough to make up the difference for machining or a stock sized MHG with no consideration for machining (hence a higher compression then a stock N/A)?

the guy i bought it off of said it was rebuilt, now about 15,000kms ago, with decked head/block and MHG, and he retorqued the head bolts, after.

but i didn't ask how much was decked, thickness of hg, or what he torqued head bolts:nono: dumb i know, but i've learned a lot since i own a supra now.
should i retorque head to 72ft/lbs after so many km's??
i dont think the maftpro can adjust timing on the mkIII, only certain apps.
i'm gonna start boostin at like 6psi, just to see how everything re-acts.
when you say "pull" you mean retard right?

oh come to think of it what is stock boost on a 87-88 GTE??

 

[CRE]

I would try to get ahold of the previous owner for that info. I suppose, worst case scenario you could do a compression test to see how close it is to specs.

You're fine to do a retorque.

Timing control for the MKIII has been fixed and is good to go, look in the SME section for piggybacks for the link to the thread over at FTT.

Stock boost? 7 to 8psi, IIRC.

 

[dumbo]

I would try to get ahold of the previous owner for that info. I suppose, worst case scenario you could do a compression test to see how close it is to specs.

You're fine to do a retorque.

Timing control for the MKIII has been fixed and is good to go, look in the SME section for piggybacks for the link to the thread over at FTT.

Stock boost? 7 to 8psi, IIRC.

yah i'm not sure his number now, been a couple months:cry:

very good i'll make sure shes still at 72ft/lbs

that is even better news, i'll look into that,

wow that is much lower then i thought. maybe i'll start at 4lbs, little worried about the higher comp pistons, and lack of oil squirters.

 

[CRE]

Someone correct me if I'm wrong, but I'm sure that if you want to boost lower than the stock boost you're going to need to find a lower waste gate with a softer spring. The stock waste gate actuator doesn't move until it hits 7psi or so.

 

[viper92086]

u'll be fine with 8psi.. i been at 13psi for over a year

 

[dumbo]

yah I guess u can't boost lower than stock even with boost controller didn't think of that
Viper that's rad like your car btw

 

[CRE]

i'm sure you could probably find an actuator with a softer spring, but I'm with Viper. As long as you take care of everything and pay a lot of attention to your tune you'll be fine at stock boost and probably a bit higher.

Viper, that on a stock CT? You ever dyno that at 13? I'm sure Dumbo won't mind the thread jack for that.

 

[dumbo]

Viper, that on a stock CT? You ever dyno that at 13? I'm sure Dumbo won't mind the thread jack for that.

Viper i would love any info you'd like to provide, since you've been running over a year over stock boost, please enlighten me, you must of done somthing right, or everything. i'm gonna start tearing down in like 9 days now:evil2:

maybe some pics:love:

 

[viper92086]

i'm sure you could probably find an actuator with a softer spring, but I'm with Viper. As long as you take care of everything and pay a lot of attention to your tune you'll be fine at stock boost and probably a bit higher.

Viper, that on a stock CT? You ever dyno that at 13? I'm sure Dumbo won't mind the thread jack for that.

i've dyno'd at the stock boost with stock gte everything (ic, afm, boost, electronics) and i did 250rwhp. since then i have upgraded to a spearco IC with hard pipes, 13psi, rebuilt ct-26, maf-t (rough tuned) in blow thru.

Viper i would love any info you'd like to provide, since you've been running over a year over stock boost, please enlighten me, you must of done somthing right, or everything. i'm gonna start tearing down in like 9 days now:evil2:

maybe some pics:love:

I started the build almost 2 years ago. i used a GE with 50k miles (bought the car with 28k). i pulled the head, changed to a new stock headgasket to be safe, used arp studs and torqued it down to 81ft lbs. i went through alot of headaches with the stock afms (yes more than one) the car just wouldn't feel like it was boosting right. so i went with a maf-t in blow thru mode. tuned that with a wideband. i've been at 8psi for maybe about 10k and 13psi for 15k miles. i've been to 3-4 road racing events with this setup with no problems except now i am overloading my cooling system. i just picked up a 3 row rad so that should be good. oh yea i am also running a external B&m oil cooler in conjunction with a oil filter relocation kit. i would def recommend upgrading you exhuast to 3+ inches before you turn up your boost and make sure your car is in healthy working order.

here's an old pic

the only thing that has changed is the cressida pipe has been replaced with a metal pipe. i'm in the process of also trying to make a 1 peice upper hard pipe.


btw good luck with your na-t conversions, i'm sure iceberg will chime in because his car has been na-t longer than mine with more boost. (i copied his setup once i saw it)

 

[CRE]

So GTE electronics?

 

[viper92086]

So GTE electronics?

correct, with the knocksensor wire spliced into each other at one of the connectors so i can use a single KS

 

[dumbo]

so you got NA valve covers right, where your coil packs mounted, is that a gte tb, or can i get away with stock, they differents sizes, will a ge tb mount to a gte upper intake??

is your turbo oil drain go to a custom drain into the oil pan??

so when you say blow thru without a AFM, you just use the maftpro and a MAP sensor??

i got a about a million questions and i haven't even started, hope you dont mind helpin out:1zhelp:

i got 2 3/4 exaust no cat just a resonator, dont know why the guy before didn't go 3" and i got a DDp pipe coming so i wont be running the stock turbo elbow.

thanks a lot man really appriciate the help.

 

[CRE]

so you got NA valve covers right, where your coil packs mounted, is that a gte tb, or can i get away with stock, they differents sizes, will a ge tb mount to a gte upper intake??

If you're swapping over a GTE intake manifold just swap over the TB.

so when you say blow thru without a AFM, you just use the maftpro and a MAP sensor??

No, he's running a MAF-T. That's a MAF Translator. It allows you to use a GM Mass Air Flow sensor, a less restrictive type of sensor than the 7M-GTE's KVAF. You can see it up toward his passenger headlight in the pics. You're thinking of speed/density. (By the way, the MAF-T is not compatible with 7M-GE electronics. If you intend on running the stock 7M-GE electronics you'll need either the MAFT Gen II (will let you run a GM MAF) or the MAFT Pro (will let you run a GM MAF or speed/density or a KVAF... although I've no idea why anyone would run a KVAF if they've come this far with their N/A).

dont know why the guy before didn't go 3"

Because anymore is overkill on a N/A?

 

[viper92086]

cre is right, i used to use the stock na intake manifold but i thought it looked very messed so i picked up a cressida tb and intake manifold (similar to the gte but slight differences). my coil packs are mounted under the intake manifold. i welded the coilpack bracket to that support bracket underneath the intake manifold. it just makes things different and i like it when people can see its a NA-T not a GTE. i'm very proud of my na-t conversion lol

 

[dumbo]

yah I'm going all gte elec. I got the maftpro and the 3bar map. You guys are saying the kvaf(stock gte afm ?) isn't as good as the gm maf Man carbs are easier LOL
I'd be pround of your conversion too viper

edit
i wont need a afm with the speed/density(MAP sensor) right..????, so can i take it the afm right out??
sorry if i sound dumb guys, never screwed around with a supra, let alone a efi car before, but i'm hooked

please feel free to dumb it down for me, i've read TONS on maftpro, but i still have lots of questions,
do you guys think 2 3/4 exhaust will be ample?
is the external B&m oil cooler a lot bigger?? oil filter relocation kit..whats it consist of?

 

[dumbo]

anyone..??

am i way out to lunch, do i still need some sort of AFM with the MAP sensor??

 

[CRE]

No, no air flow meter required. There is a way to run both speed/density and a MAF, but it's uncommon.