Help with EPROM.

[TSI_AWD_FTW]

I've is stalled a new motor, with an upgraded turbo, 800cc injectors, gm maf and maft, and an EPROM with a chip for 800cc injectors and 2g maf, is the affecting it starting in any way? It's also a v1 maft I just need some advice.

 

[snowborder714]

Do you have the MAFT set for stock injector size to let the chip do the work?

 

[TSI_AWD_FTW]

Yes, but do I need to make any adjustments since the chip is for a 2g maf?

 

[bryanwheat]

You will have to richen it up a little bit. Hopefully you have a wideband.

 

[MY1GDSM]

Who the chip from? A few more details would help but your Maf comp. Is gonna need to be different if your running anythings but a 2g maf....

Heres a picture for reference of the maf comp difference between the 1g an 2g

Edit wrong pic will upload right one

 

[TSI_AWD_FTW]

I bought the EPROM from an individual on here, and it came with that chip. I just want to get it running so I know it's good so I can get it tuned and a new chip made

What setting would I need to apply to the maft? Like I were using a a regular chip set for a gm maft but compisate for the afr?

 

[MY1GDSM]

Do you have a Data Logger? Wideband, Ect? Like I said before Provide some more details about the car the more info you provide the more people can help... .

There's no such thing as 800cc injectors that I know off (There is PTE 880 (flow 840cc's) Or FIC 850's) but they both have different deatimes) with out knowing the settings of the chip an the details about you DSM nobody can tell you, Again fill out your profile with all the mods of your car or list them here an we can give you a bit of help in the right direction.

Basically there isn't a way for anyone to tell you what to set it too... Yet... .

 

[TSI_AWD_FTW]

Im sorry, I have pte 880cc and I Currently do not have a wideband.

 

[MY1GDSM]

And the chip is for? Still didn't awnser all my questions...

Nobody can help unless you provide all the information needed

 

[TSI_AWD_FTW]

The chip says it's for a 2g maf and 800cc injectors that's all I know about it.

 

[rts91tsi]

OP, obviously you best bet would be to have a new chip burnt that facilitates the mods you have, get a logger (plenty of freeware available), and/or a wideband O2 unit.

However, provided that you have instructions for the 1st Gen MAFT, you could probably set the translator up to to facilitate your current chip set.
MAFT instructions, version 1.3 OLD VERSION - Full Throttle Speed Tech Support

On page 3 of the instructions, you'll notice the setup instructions. There is a math equation to set up the injectors being used. (1-(800/880)*100 for your situation. Just follow the order of operations for the equation:

First, (800/880)= 0.91 (rounded to the nearest hundredth)
Then, 1 - 0.91= 0.09
Last, .09 * 100= 9%

On your Base adjustment, add 9% or Base 2 (Base 2=10%)

The last bit of advice I can give is about the 2g MAF code. There is a dip switch that enables you to set the vehicle being used, 1g or 2g, I would set it to 2g, since your bin has that for its MAF code. In theory it should work but don't quote me on that.

 

[MY1GDSM]

Problem is theres more then just that.... That comes into play like different Injector Deadtimes etc with out knowing What exactly the chip is set for the op could still be pretty far off.... Better then nothing I suppose though

Although I Wouldn't set the Base dial to -10% as the Chip may say 800cc But I highly doubt that it's actualy set to 800cc

 

[donniekak]

Yes, but do I need to make any adjustments since the chip is for a 2g maf?

Yes. Use the stock injector setting for a 2g. aux4 base 2

 

[TSI_AWD_FTW]

update.... so ive pulled the ecu out and the chip says "90/60/AWD dual knoc 850cc 2g maft" what does this mean?

 

[MY1GDSM]

9k rev limit, 6k NLTS, 4.5-5..5K Adjustable Two step, Dual Image With Phantom Knock code and 850 cc Injectors with a 2g maf

 

[doayamaha]

if you have the chip, that is set up for everything then the maft doesn't need to be there. and if you have the pte 880's then it looks like the chip is set for fic 850's.

 

[TSI_AWD_FTW]

Did a compression test and the needle just bounced up to 100 and back to zero. /: guess I'll run a leak down now.

 

[90_eclipse]

I have nearly the same exact setup in the same situation and I just did this last weekend...

I got a 90 and I just put in a 91-94 ECU with eprom for PTE 880cc injector compensation with revised timing, 8k rev limit, etc.

First of all, you're going to want to keep the MAF-T. The chip itself isn't enough to give you a proper tune. Each car reacts differently to a MAF-T, and every MAF-T is different. With my chip, my setup is running as 500 injectors, and is still running very rich. You're gonna want to set up the injectors for the stock 450's just to get it started and see where you're at. You'll want to have everything zero'd out minus the aux and base setting for the 450's (aux 4, base 2). And like it's been said, make sure you have the 2nd dip switch flicked upwards to set it for a 2g MAF.

Don't worry about the idle all that much. My trims will pull all the way rich, then pull all the way lean. It's only idle, and it really isn't doing anything that can cause any damage.

 

[MY1GDSM]

I have nearly the same exact setup in the same situation and I just did this last weekend...

First of all, you're going to want to keep the MAF-T. The chip itself isn't enough to give you a proper tune.

The GM Maf an MAFT not adjusted right would the reason for not having a proper tune .... the large adjustment points and the Use of a GM Maf in a way that its not designed IE Blow threw an using a chip not setup up specifically for the car is the only reason you wouldn't be good to go...

Telling people to ignore there trims isnt helping you should rethink you tuning approach and also FYI Its the GM Mafs that read different because of things like Intercooler Piping configuration in blow threw not the Maf-t box that causes it

if you have the chip, that is set up for everything then the maft doesn't need to be there. and if you have the pte 880's then it looks like the chip is set for fic 850's.

To use the GM Maf it does...


But this is what I was talking about before your going to have quite a bit more dead-time with Pte Injectors then with Fic 850 so the car will be maxing your low trim tring to compensate for that depending on what the Fuel presure is set in the chip an your car

Did a compression test and the needle just bounced up to 100 and back to zero. /: guess I'll run a leak down now.

Your not doing something right then or something is wrong with the Compression tester it should hold whatever pressure it goes upto you sure the relif didnt get hit?

 

[90_eclipse]

Sure the GM MAF wasn't originally designed as a blow-through but it simply as accurate as a draw-through. This is a different argument. You're going to have your own opinion backed up with your own experiences. Same applies to me. My experiences is that if you take two different cars with the same exact setup and the same settings on a GM-MAF, it will be different. Same thing applies to nearly every other tuning device.

The reason to stick with the MAF-T is because it still gives you the ability to tune. The increments are large for BASE TUNING (5%) which is good enough to get the trims in the ball park. RPM tuning can be used to tune 2% increments.

And no, I'm not telling him to ignore all of his fuel trims. I'm telling him more specifically that the FTRL is the least to be concerned about. The chip will COMPENSATE for the injectors, but it still doesn't get it dead on... Hence why there will be a lot of sweeping in that specific trim zone. And due to this, he shouldn't consider changing the BASE setting if he sees it sweep a lot. Instead, choose to lean/rich the base depending on the MID if you see the ECU pulling more than 10% off the trim, and the MID setting on the MAFT is close to 0.

And to the OP, if your curious about my numbers, I currently have mine set for 580cc injectors. It sounds odd, but my fuel curve was way to rich, and the maps for 430-570cc injectors were simply still too rich. Again, you might not have the same luck because your car might play differently with it.