Blow through or not?

[getusum]

My car is currently not set up on blow through on the gm maft. It is next to my air filter. So is it going to be a pain in the A to tune? I have Safc, maft translater, 750cc. afpr, rail, 255 rewired, street frount mnt, new 60-1 turbo, tail 38 wastgate, and greddy bov( resurculating). Or do you guys think I should by the blow through?

 

[oldman]

Either way, you're going to have tough time trying to control 750s with piggyback because of timing advance.

 

[mach4g63t]

If you have the MAF-t and you like the blow-thru's noise, I'd say go ahead and pickup a GM MAF from the junkyard and get it on. But again, that's if you want every one the highway to know you're getting on when you accelerate up the on-ramp.

 

[getusum]

Great. First thing im doing is driving straing to the dyno and tuning it there. It should be ok on stock timing right? The maft is set to 750cc. Will that help? I already have the Gm 3i inch Maf

 

[snowborder714]

If you have the MAF-t and you like the blow-thru's noise, I'd say go ahead and pickup a GM MAF from the junkyard and get it on. But again, that's if you want every one the highway to know you're getting on when you accelerate up the on-ramp.

He has it set up in draw thru (the GM MAF is in place of the stock MAS).

Great. First thing im doing is driving straing to the dyno and tuning it there. It should be ok on stock timing right? The maft is set to 750cc. Will that help? I already have the Gm 3i inch Maf

I would not trust the MAF-T to allow you to tune for 750's. And since that is above the normal limit of the S-AFC, I would either look to downsize the injectors to 650's or get a better air/fuel controller. The MAF-T is known to be very sporadic in it's tuning capabilities. By looking at your profile, it doesn't look like you have a logger. This should be something to look into getting very soon if you plan on trying to control the 750's with the S-AFC. If not, you could run into some problems.

 

[oldman]

Great. First thing im doing is driving straing to the dyno and tuning it there. It should be ok on stock timing right? The maft is set to 750cc. Will that help? I already have the Gm 3i inch Maf

It doesn't matter how you compensate (through SAFC, MAFT or combination of both), the bottom line is you have to hide total of 40% of air flow from the ECU which will create too much timing advance under WOT, this is a huge problem because you have no timing control with your piggyback system (SAFC or MAFT). 650s -680s are about the largest acceptable injectors for piggyback systems, about -31% to -34% of required compensation. I hope you have logging capacity to double check your so call "dyno tune", I guarantee it will be a shitty tune at best if they haven't raised this issue with you when you setup that appointment.

 

[getusum]

Well i have the Afpr also. I can cut it up or down there. And as for logging im doing that at the dyno. Im considering orderin a chip from dsmchips also. ANd what kind of logger do you guys recommend? Rember I need something easy to read.

 

[oldman]

oldman - 3 snowborder714 - 1

 

[snowborder714]

oldman - 3 snowborder714 - 1

HAHAHA

 

[getusum]

It doesn't matter how you compensate (through SAFC, MAFT or combination of both), the bottom line is you have to hide total of 40% of air flow from the ECU which will create too much timing advance under WOT, this is a huge problem because you have no timing control with your piggyback system (SAFC or MAFT). 650s -680s are about the largest acceptable injectors for piggyback systems, about -31% to -34% of required compensation. I hope you have logging capacity to double check your so call "dyno tune", I guarantee it will be a shitty tune at best if they haven't raised this issue with you when you setup that appointment.

I cant retard timing at the CAS? The guy I bought the 750cc,turbo and header from did it and made 535 awhp. But he did also have the chip pre programed to 750cc and so on.

 

[snowborder714]

Well i have the Afpr also. I can cut it up or down there. And as for logging im doing that at the dyno. Im considering orderin a chip from dsmchips also. ANd what kind of logger do you guys recommend? Rember I need something easy to read.

Your AFPR should be set at 37psi with the vacuum source off. I would not go adjusting your fuel pressure unless you REALLY know what you're doing.

As for loggers, search the forums as there are many different ones with different capabilities out there.

 

[oldman]

Well i have the Afpr also. I can cut it up or down there. And as for logging im doing that at the dyno. Im considering orderin a chip from dsmchips also. ANd what kind of logger do you guys recommend? Rember I need something easy to read.

1. Yes you can lower your fuel pressure to make your 750s smaller but be careful because you're 1G and your base fuel pressure is already low to begin with, you really don't have too much room to play with before you start to have spray pattern/ionization issues.

2. You will always need a logger regardless how you plan on tuning it, you can't just set it and forget it because things will always change, you need to constantly monitor the system and make adjustments when need be. To me, "dyno tune" is overrated, not to mention I wouldn't trust a tuner who doesn't understand that 750s are too large for your setup.

3. Dsmchip will solve your timing problem as long as it's setup properly, however you'll still need a logger regardless.

 

[getusum]

Your AFPR should be set at 37psi with the vacuum source off. I would not go adjusting your fuel pressure unless you REALLY know what you're doing.

As for loggers, search the forums as there are many different ones with different capabilities out there.

In your opinon. What is a good logger? Why are 750cc to large? Im planning on shooting for 550 awhp plus? Plus the 60-1 is not a small turbo. And im adding a NOS later. What do you datta log with wiseman?

 

[snowborder714]

In your opinon. What is a good logger? Why are 750cc to large? Im planning on shooting for 550 awhp plus? Plus the 60-1 is not a small turbo. And im adding a NOS later. What do you datta log with wiseman?

A good logger is DSMlink which is also a tuner and can handle any injectors you throw at it. Some of the larger injectors will need more work than the 750's though. I use DSMlink along with a lot of people on this forum. I would guess that if you asked anyone who has it what program to get, they'd recommend DSMlink. I would, especially if you're shooting for that high of horsepower. There are probably people running those numbers with an S-AFC, but most will be running DSMlink or AEM EMS.

I also believe MMCd is another popular logger, but don't know too much about it.

 

[2gGSX]

750's are "too large" because as oldman stated above, that requires you to "hide" a massive amount of airflow from the ECU which will result in it trying to keep adding timing, which will lead to knock.

MMCd is a free logger you can download here: http://mmcdlogger.sourceforge.net/. The capabilities of the logger are described therein.

 

[DGajre777]

As Oldman said, get a chip and use it with your SAFC. www.dsmchips.com

 

[AWD_Boosted4g63]

If you have the MAF-t and you like the blow-thru's noise, I'd say go ahead and pickup a GM MAF from the junkyard and get it on. But again, that's if you want every one the highway to know you're getting on when you accelerate up the on-ramp.

word

 

[Talesin]

If you're shooting for 500+ awhp, I'd go with DSMLink if you're already going to shell out for a chip. Lets you run injectors as large as you want, as you can set up the global deadtimes and fix the timing advance as you need it, directly, without having to trick the ECU into doing what you want it to.
Also, it's a HELL of a lot more flexible than a burn-once chip... lets you adjust your tune any time something changes, instead of having to pay for them to burn you ANOTHER chip.. so with DSMLink, you just re-tune if you decide to go with 1000cc injectors, no further cost outlay.
A dsmchip, you shell out another $150. Every time.

 

[Skip01]

Big injectors on a piggyback will definatley not be fun.. at all