Can anyone tell me what number range does that maf transmit to the ecm? is it 0 to 175 or 0 to 255? and does the 87 maf have the same range of measure as the 85 maf?
So I guess if I'm only showing 175 on the scan master in 3rd wot then I probably have a bad maf? hmmm I should have read that last line on your response... so could I talking about swappin for a known good ECM or does the TT chip have anything to do with the low count at wot? I'm guessing 175 is low for wot?
Heres some more info,
87 ecm , not sure if its stock maf or 87 maf, I think its 87, running wot 3rd gear, 11psi boost, numbers are
o2 - 785
kr - 1.5 on the shift into 3rd then falls to 0
af - 175 gr
L8 - 255
The 175 gr/sec @ 11 PSI reading on a stock type HA sounds about right.
What RPM was the 175/11 reading at?
I don't have the rpm I only had so much road to work with and thats at the bottom of the scan master list, only so much time to push that button, I was lucky to get the first 4 readings then I had to lift. It does have stock rear so if it helps I do recall that the o2 / kr reading was at 61 mph so thats 62 mph with the size tires I'm running.
its not exactly stock, and its a really long story that I won't get into, lets just say prev owner at sometime must have smoked the turbo, and the replacemet says garrett, but I can't find any info from any of the numbers on the (polished) housing. So basically I won't have any idea how much it flows and won't really know what that 11psi is worth until I take it off open it and start counting fins and measuring, if that makes any sense. And even better because its not what appears to be a stock or oem fit replacement turbo notice in the picture below how the throttle body is tilted back and almost shoves the tps sensor into the hood when closed. Yeah its come a long way since I bought it, but I still got a ways to go. ( And please no cracks about the roach clip holding the actuator rod down. )
Thank you for the info so far that you've given me, I'm have a local buick friendly shop take the top of the motor apart and do a cam and springs and lifters and timing chain for me at the end of next month the turbo will have to come off for that so I'll be able to get all the measurements and stuff I need then, and I do have a rebuilt stocker on hand so we'll see whatever is gonna flow more will probably be the way I go with it. Maybe my maf # is down at 175 cause of the size of that turbo sitting on there, maybe cause it spools lightning fast as in I slap the pedal down and look over and i'm at 10 psi right away maybe it doesn't flow as much air as a stock turbo. thats a lot of maybe's.
Guess I'll have to wait till then to find out, but again thanks for your help I think I do understand how that air measurement works better than I did before. I just wonder if that sensor isn't at 255 does that mean that the ecm is not commanding as much fuel as it possible could at wot?
Ok, cool.
First off, looks like you have a 86-87 style turbo.
No way to say what it is untill you open it up as you said.
More importantly, clamp/tie wrap ALL the hoses, especially the one with the FPR.
(Is this a 233 regulator?)
Just put new plugs in month ago but I'll still pull and check'mThis is what I would do :wink::
1 - Spring Cleaning.
2 - Contact TT and verify the chip. It is possible that the chip is in fact a non-alcohol chip. You can to a a large extend verify that with the timing at WOT.
3 - Verify the injectors. Use the numbers to do that, not the "looks".
4 - Go through the knock list and the hose hoop-up review in the sticky.
5 - Verify the turbo / injectors and chip match.
6 - Pull the plugs and make sure they are dry (No oil on the plugs)
There are MANY factors that may prevent you from running that level of boost. One of them being the gasoline we buy today, which changes pending the winter and summer months, as well as is area specific.
I am not going to get into all the detail as that is listed on the KR list. :smile:
If you are going to push the performance of the set-up, I suggest some kind of a recording scantool and a WB.
Ok, cool.
First off, looks like you have a 86-87 style turbo.
No way to say what it is untill you open it up as you said.
I agree with Jerryl... it looks like a 86-87 style turbo...
sent you some pics
Yes.Limit engineering wouldn't happen to be from Arizona would they? . . . .
Ok, this cars history is like a long mystery novel, the more I look around the more questions I end up with.
I said before the previous owner killed the turbo, racing no doubt, thats what I would of done....anyway, I put the ecm back in the car and it seems to be running with no errors, will keep an eye on that one, but like I was talking about, he blew the turbo, and put a replacement on only he didn't go stock 85 replacement its something else, what I'm not exactly sure of, but Jerryl had an interesting theory, that its an 86/87 stock turbo mounted on a hot air intake.
Either way thats not quite a big issue at the moment either, this morning while I was poking around the back of the motor I did notice something that I can't believe I didn't see before. It seems that on the small piece of tubing that runs between the turbo and the intake manifold, there is a nozzle mounted at a 45 degree angle, the kind that looks like prev owner was spraying something. This kinda threw me off at first cause I didn't see anything marked on the chip to indicate alcohol or anything else being sprayed, but after thinking about it, seeing what the car does now (11psi on 93 pump gas) it would seem to make sense that spraying alcohol or something else would let you run 13 psi on 91 pump gas with no knock or maybe he was running one of those 7th injector set ups that sprays extra fuel at wot. Not to mention when I got the car I had to turn the fuel up to get it to run without missing and a lot of knock under wot and if prev owner was spraying alcohol and took the kit off and didn't turn the fuel back up......yeah it was at like 36#s with line on when I got it, now I have it at 42#'s line on.
I'm a little pev'd at the prev owner, he should have told me all this stuff, I was buying the car regardless and knew it would be my project, but if he would have been a little more forthcoming it would have made getting this car back in shape a lot easier.
I got so many things going on all of a sudden I don't know where to start. Guess I should get you guys a set of Idle scanmaster #'s to start with?