Gm Maf+s-afc

[alqatan]

I have two cars both of them are highly moded but never run anyone of them for high boost

I have Mitsubish/eclipse/97/FWD, I'm living in Bahrain, this is faraway from US, somewhere in the middle east

My other car, is Mitsubish Colt or Mirage as you call it, It's 93 model but never run it till now, still waiting till I rebuild the engine, I'm using 4g63+f5m22 this is the stock colt tranny+many other things.

I'll list my parts so you can help me to answer my questions
Engine, 1g full engine, stock short block, I have ordered ross pistons+eagle connecting rod but I have heared I still can get alot of HP with the stock motor+MLS gaskit+ARP head bolts+Hks272 cams+Crower spring and retainers+1mm valve over but still didn't use that because I'm saving that till I rebuld the engine with racing stuff.

ACT street clutch+lighter flywheel+quaife.
Set of lighter pully+cams gears which is setting in zero+RFH intake+stock 60mm throttel body.

I'm using a T3/T4 manifold+35mm turbonetic wastegate+T3/T4 greddy turbo to4e, 60 trim with .63 a/r exhaust housing.

My intercooler is big enough but actually I don't know the brand of all my things because I have bought the cars and there were many things on it before I had got it, the car was in US for a friend of mine, he lived in Austin for studying then he sold me his car, MZM had done the engine first time.

I'm using S-AFC+660 cc injectors+walbro 255 high pressure as a fuel managment.

I have ordered all the same stuff for my Mitsubishi Colt+2 FP3065 turbo kit, I have alot of lag and never run my eclipse more than 18 psi on pump gas, I'm hitting this boost only in the 5th gear, I'm hitting like 11-12 in the first gears, or fuel is so suck It's 89 compaired to yours this is what I have heared from some people here, I can use c16 race gas.

My question, can I use the GM MAF and set the translator to zero and make all the adjustemnts from S-AFC, actually I don't know how to use translator, I had used that once on my friend 3000 GT and we made all the adjustments from S-AFC, I don't want to blow my motor for stupid lean thing.

My gauges are, greddy EGT so I can adjust high throttel, apexi boost, autometer A/F ratio so I can adjust the low throttel.

I have ordered Lm-1 wideband but actually I don't know which is the best A/F ratio I should tune it on.

In our country we run our cars for top speed and I have run my car till 290 km/h with 18 psi in the 5th, I have reached the rev limiter on the 5th it was like 7550 this is what S-AFC wrote.

I'm having the same setup on my Mitsubishi colt, there is some other difference, I got 720 cc insted of 660 cc for the eclipse, I'm using the stock tranny with phantom grip because I haven't got quaife, I'll have to shave the eclipse turbo flywheel so I can let the stock tranny work.

Sorry for my bad english but I really need your help and please read everything carefully
How to tune the GM MAF+S-AFC?
Is the stock 2g MAF will max out with my T3/T4 in full boost like 30 psi?
What about my FP3065 is it going to max out?
Actually I'm gonna install it in the intake side because I'm not looking to blow throught my blow off valve and It's really hard to install it in the intercooler pipe, 3.5 inch converted to 2.5 I'm sure it'll look ugly!
Can I depend on my S-AFC as tuning and leave the translator away because I know how to adjust S-AFC I had use it in many car!
I'm hitting like 2300 + in karman

Sorry for make it too long, next time my questions will be shorter

 

[alqatan]

I need an expert to answer my questions, any help?

 

[kpt4321]

My question, can I use the GM MAF and set the translator to zero and make all the adjustemnts from S-AFC, actually I don't know how to use translator, I had used that once on my friend 3000 GT and we made all the adjustments from S-AFC, I don't want to blow my motor for stupid lean thing.

Yes, you can.

However, wouldn't it be easier to just learn how the MAFT works? I wouldn't want a part installed in my car that I didn't understand...

My gauges are, greddy EGT so I can adjust high throttel, apexi boost, autometer A/F ratio so I can adjust the low throttel.

I have ordered Lm-1 wideband but actually I don't know which is the best A/F ratio I should tune it on.

If you have a LM-1, then totally ignore the EGT and A/F gauges and just use them to tell you if something is wrong when you are racing. Use the LM-1 for all your tuning.

The optimum AFR depends on a whole lot of things, such as boost level, fuel quality, etc. On 89 at 18 psi, you're probably going to end up around 10.5:1. On C-16, you'll want to be in the 12's.

At idle and cruise, the ECU will try to get you to 14.7:1.

Is the stock 2g MAF will max out with my T3/T4 in full boost like 30 psi?

The 2g MAF will max out at about 50 lb/min of airflow. With that 60 trim turbo, you will probably (but barely) be ok.

What about my FP3065 is it going to max out?

You can make over 550 whp with that turbo.

 

[alqatan]

Yes, you can.

However, wouldn't it be easier to just learn how the MAFT works? I wouldn't want a part installed in my car that I didn't understand...



If you have a LM-1, then totally ignore the EGT and A/F gauges and just use them to tell you if something is wrong when you are racing. Use the LM-1 for all your tuning.

The optimum AFR depends on a whole lot of things, such as boost level, fuel quality, etc. On 89 at 18 psi, you're probably going to end up around 10.5:1. On C-16, you'll want to be in the 12's.

At idle and cruise, the ECU will try to get you to 14.7:1.



The 2g MAF will max out at about 50 lb/min of airflow. With that 60 trim turbo, you will probably (but barely) be ok.



You can make over 550 whp with that turbo.

Thanks for your answers, so I can put the translator on zero and depend on S-AFC?

I have heared with GM MAF I won't be able to adjust the throttel part, is that true?
And I have heared the tuning will be really hard If the injectors were more than 550 cc?

 

[kpt4321]

I don't know what you mean by either of those questions, sorry.

"Won't be able to adjust the throttle part?"

You can tune with injectors larger than 550's on the SAFC and on the MAFT. They both tune the same way (airflow correction), so you'll see the same end result.

 

[DSMgurlie]

so I can put the translator on zero and depend on S-AFC?

I had the same question. I just did the blow through set up and my car feels like shit :thumbdown . I have the translator set for 550's (which is what i have) but haven't touched anything else. I pulled my plugs and it looks like i was running lean. So i added some more fuel with my afc. Not sure if i should just keep playing with it or if anyone has close to the same mods as me that can give me sample settings i can base off of.

 

[alqatan]

I don't know what you mean by either of those questions, sorry.

"Won't be able to adjust the throttle part?"

You can tune with injectors larger than 550's on the SAFC and on the MAFT. They both tune the same way (airflow correction), so you'll see the same end result.

I mean by part throttel, when the car isn't in WOT, I mean when the car in mid throttel.

I have heared it's really easy to tune the WOT but It's hard to tune the cruising part, I think I'll let all the setting in the translator on zero and I'll do all the adjustments from S-AFC because I won't remove the S-AFC and I think I don't have to change the tuning in my S-AFC after installing the GM MAF?

Is the matchup gonna be lean or right?
It might be lean because the MAF will flow more, is that true?
So I might need to make the S-AFC rich in throw all the rpm range.

Thanks for your help

 

[alqatan]

I got 290 km/h in apexi AVC-R and the Karman was like over 2300 but I never reached over 2400, does that mean something to you?

I have heared I can remove the stock 2g MAF screen and It might help littel bit but I guess I'll have to change all the S-AFC adjustments it'll be lean, so I'll have to make it rich, the owner of the car had done this once long time a go and he said it helped littel bit but after he reinstalled everything like stock he put the screen back.

Thanks

 

[kpt4321]

I mean by part throttel, when the car isn't in WOT, I mean when the car in mid throttel.

I have heared it's really easy to tune the WOT but It's hard to tune the cruising part, I think I'll let all the setting in the translator on zero and I'll do all the adjustments from S-AFC because I won't remove the S-AFC and I think I don't have to change the tuning in my S-AFC after installing the GM MAF?

It's no harder to tune mid throttle on the MAFT than it is on the SAFC. In fact, I would reckon that tuning mid throttle on the MAFT is easier.

Is the matchup gonna be lean or right?
It might be lean because the MAF will flow more, is that true?
So I might need to make the S-AFC rich in throw all the rpm range.

The MAFT is designed so that the matchup shouldn't be rich or lean, it should stay the same. However, you're just going to have to see.

 

[alqatan]

It's no harder to tune mid throttle on the MAFT than it is on the SAFC. In fact, I would reckon that tuning mid throttle on the MAFT is easier.



The MAFT is designed so that the matchup shouldn't be rich or lean, it should stay the same. However, you're just going to have to see.

Then I'll try to use the MAFT tuning If it's easier than S-AFC, I thought it was so diffecult and I thought I need dyno to tune it right, the problem we don't have dyno in my country, and I don't want to blow my motor for stupid lean tuning, I'll try to tune by LM-1

Thanks for the reply, hope the others join us when ever I ask for help
Thanks again!

 

[JohnTSI]

Just so you know we put a Maft/afc/keydrivers combo using the Maft just to go blow through in the 10's last night

 

[slickster]

Sweet!

 

[Blk_99gst]

Then I'll try to use the MAFT tuning If it's easier than S-AFC, I thought it was so diffecult and I thought I need dyno to tune it right, the problem we don't have dyno in my country, and I don't want to blow my motor for stupid lean tuning, I'll try to tune by LM-1

Thanks for the reply, hope the others join us when ever I ask for help
Thanks again!

I'll add my 2cents; I think I read everything in this thread so correct me if I'm wrong on anything.

One thing I didn't see listed in your list is a logger. It's almost necessary to have one so that you can see the ecu's fuel trims and tune cruising/off boost. Regardless of which device you use to tune (maft or safc) you would still need to adjust according to the fuel trims. You say you have 2 cars, the 97 eclipse and the 93 colt. I think you're upgrading the colt, correct? If that's the case then you would need an OBD1 logger (years 1990-1994). OBDII was used from (1995 to present). Also, if you get an OBDI logger for the colt, you should also be able to see knock count value, which would be very critical to make sure you do not blow up your engine.

 

[99GSXTC]

I had the same question. I just did the blow through set up and my car feels like shit :thumbdown . I have the translator set for 550's (which is what i have) but haven't touched anything else. I pulled my plugs and it looks like i was running lean. So i added some more fuel with my afc. Not sure if i should just keep playing with it or if anyone has close to the same mods as me that can give me sample settings i can base off of.

Im not sure as far as your mods are concerned but I have both the Maft and the SAFC and havent even installed the maft. Still tuning with the SAFC and am running 650cc injectors, of course I am still on the stock turbo and before anyone says anything, I do have a bigger turbo just waiting and I do have my boost controller running at 7 psi on low boost and 14 on high boost and actually am running better now than I did running factory. Ive ran 13's and the car simply pulls until I get mid throttle in fourth. My car is fly by the pants street tuned with the SAFC, and so far, even with the 650's the walboro 255, the cams, pulleys, lightened flywheel, front mount, etc, I have yet had a need for the maft.

 

[Blk_99gst]

My car is fly by the pants street tuned with the SAFC.

hmmm, that's not the best way to tune you know. If can can afford all that stuff (650's, cams, pulleys, fmic, bigger turbo) you need to fork over some money for some tuning devices. A pocketlogger and a wideband. A pocketlogger alone should be like the 3rd item people get. Well before a safc and injectors.

even with the 650's the walboro 255, the cams, pulleys, lightened flywheel, front mount, etc, I have yet had a need for the maft.

There is no set point at which you need or do not need a maft. You could say everyone needs one, even school teacher plain jane who will never modify her car. The maft does more than just fuel tuning, it increases spool up (even on the t25) and increase overall throttle response. After I installed my maft on my car, it was just a lot more fun to drive. So when you say you haven't had a need for the maft yet, I would disagree. I don't see why you don't install it already.