JC if anyone that has the SSIM noticed a difference in AFR before they tuned. Im curious if the SSIM leans you out, richen you up or doesn't make a difference either way...

 

Hmm...interesting question

You'd need a wideband to see the change in AFR or a SAFC to view airflow...

 

Yeah, I'd like to know if there's a general trend of AFR migration with SSIM as well. Obviously each car is unique and is going to react differently depending on other mods, individual circumstances, etc, but maybe there's a trend like with headers (rich)... Hopefully someone knows

 

I bet you could dig up some SSIM dynos and see what the AFR curve looks like.

 

^^^^ thats not a bad idea.. but im just wondering if they would be tainted by a tune. Say if i have timing advance, SRI, header, exhaust and dyno then tune and then add the ssim and dyno and tune.
Id like to know if after the orig tune if the SSIM changes anything before a tune is done.
Ill look up the dynos and see if anything comes of it.

I know on my 68 camaro when changing manifolds from dual plane to single plane and vice versa the jets typically needed to be adjusted therefore indicating a change in AFR at certain RPMS.
Id like to know if the SSIM richens/leans the mixture and to what extent.

 

Well you could theorize/debate that it will lean out the AFR slightly above 6000 RPM where it starts flowing more efficiently than the regular 5.5 IM and possibly make a richer AFR below that. In all honesty you won't know for sure till you have a wideband/buttprobe tailpipe sniffer in there...

 

It increases airflow but not so much to max out the injectors or fuel pump. It would be 'in the noise' so to speak.

 

^^^^^ ok so i have read all the posts on MAF and such and the 3" MAF so im opening myself up to ridicule as im sure i know this answer but gonna ask anyway. Since it "may" increase airflow it "may" run richer. Since i dont have a SAFC or WB i have no clue on any of my AFR #s. Would adding on the 3"MAF put my engine at risk. Im looking for a WB first so i can see what is going on then the SAFC then logically would be the MAF.

 

Moncef , do you still have the safc for sale or is it gone
NMEx i was wondering this also, is a narrowband since i could get it real cheap, would that at least give me an idea if im running to rich or too lean. I know a Wideband is better but just curious on the narrow

 

NB's only monitor 0-1v, and that doesn't leave much room for resolution. WB's are more like 0-5v, a lot of room for resolution.

I don't think it will increase airflow enough to cause a knee jerk reaction on the ECU's part to be dumping excess amounts of fuel in there, or opposite and go lean. I'd get a WB for monitoring purposes before I started playing with MAF sizes.

And we already have NB's in place, and even then, not very helpful using the Cipher to read their signal.

SAFCII + WB = a very helpful combination.

 

Damn i knew thats what you would say..
Nmex.. is a aem uego the model 30-4100 any good. I know it doesn't do anything like DL but i need something just so i know where im at

 

ok now im gonna be a nuisance hahah is this a good buy
http://cgi.ebay.com/ebaymotors/Innov...ht_1602wt_1165

 

I'm not too experienced with that piece. All I know is that the more you can log with it, the better, and of course, the accuracy helps too, there's a thread in the AM section that has a complete review of a few popular items.

PLX and the ZT were my final choices.

 

LC-1 is also a good wideband but you can only log AFR vs time, you have to buy additional accessories to log AFR vs RPM.

I'd go with an Innovate LM1 or Zeitronix ZT2.

 

i think i may do the Video thing likesomeone said. Placethe gauge near the tach and record. Very ricer but hahahaha

 

And we know how accurate our tachs are..

 

i think theres a zt2 for sale in the classifieds..

 

i saw that and it looks like it already gone. i just have to keep my eye out

how much is it usually off by?
And D@mn you Nmex, everything i throw out you just blast it

 

Not by too much. It seems to increase as RPM's rise, so the higher the RPM, the more off the tach. But either way it's in the noise.

 

This.

The LC-1 is good for what it is, but that's about it; I think the most you can log is 5 channels with the extras, IIRC. If you want true datalogging capabilities look at the LM-1 + LMA3 auxbox, ZT2, or if you are ever going to consider a UTEC, the TurboXS Tuner. There's also the new LM-2, which might be worth looking into.

Also, take this with a grain of salt, but here's a comparison of widebands that might be good reading for anyone in the market. I posted it a long time ago in the All Motor forum, but I'm not sure if there's more updated info or comparisons.

http://paceperformance.com/paceperfo...ndshootout.pdf

 

Another thing to consider is the bigger MAF housing alters airflow around the sensor itself, which is why A/F mixes are affected because the MAF "sees" the change... changing IMs affect airflow after the MAF, so the MAF isn't picking up as significant of a change as what is actually flowing past the MAF, even if you assume some additional velocity caused by a higher flowing IM. It is a slightly different animal you're dealing with here. But to answer the question, the IM itself won't impact the A/F mix in terms of what the ECM sees, at least not significantly, as Nmexmax and others have said. Changing the MAF housing will, so don't do that w/o proper A/F monitoring.

 

A friend of mine used the LC-1 + SSI-4 to receive the RPM signal and it worked well, but yes it does require that additional box.