Peter B.

Hello guys!! My name is Peter and i bought recently a mk2 mx5 with m45 supercharger and emanage blue for fuel management. It also has a torsen diff.

I like it very much and im glad i bought it and olso join the miata turbo forum.

i only have a question. The car work really good but at low rpm between 1000 - 2000 when i boost it, the car doesnt pull and feel like dont have fuel. After a while goes well.

what do you think about it?

cheers!!!

DonPlatt

Be careful. I'm not sure what emanage blue is, I'm putting in a voodoo box from flying miata with an msd card to control retard. If you don't retard boost you will fry your engine. You also need a wide band and gauge to tune the air/fuel mix

Peter B.

emanage blue is pararel ecu that can add fuel. My problem is not at wot but when the supercharger starts to work from n/a to boost at low pressure and low rpm .. then when it boosts at higher rpm is rich.

sharkythesharkdogg

Not entirely sure from your description, but it sounds like maybe lean tip in combined with just a lean area in general down low.

It'd be worth getting and installing a wideband gauge so you can see what it's doing for AFRs during that situation. It looks like your Emanage may even be able to accept the AFR signal, but I'm not exactly sure what it would do with it.

If you're able to replace your computer with a fully programmable option, absolutely do that.

It's possible from your description that you have a sticking vacuum bypass actuator. Basically, even though you're on throttle and the vacuum signal is gone, the mechanical linkage in the bypass actuator is snagged and holding the bypass open so you're not actually getting boost. It then eventually works free as the RPMs climb, the actuator closes, and you're into boost.

I'm hoping you at least have a boost gauge, if so, watch it during the issue to see how it behaves.

18psi

iTrader: (76)

This exact same thing happened on a JRSC kitted '96 that was brought to me
the AFR's weren't the problem, or at least not the main problem
the problem was terrible engine management and two systems fighting each other

installed MS and tuned it, and all was good

sharkythesharkdogg

We had a similar situation with a '99 and the same basic kit. It was running the old Jackson Racing "black box".

In this situation, from what we found, the black box just couldn't keep up with transition from n/a to boost with out a fat lean spot down low, and stupid rich up top. Nothing new to see there, I know.

We used the same solution. MS DIY PnP 2. The car ran better, and safer, and happier in the cold.

richyvrlimited

iTrader: (1)

I concur with what's said above, but also, why the hell are you lugging the engine by going full throttle at 1000 - 2000 rpm.

High loads at such low an RPM is not good for the health of the engine, even if the tune is 100% perfect.

Peter B.

Thank you guys for your answers!

Firstly, it is not possible to buy a standalone unit. The supercharger works fine and there is no leakage. I control it correctly with the boost gauge.
Secondly, it seems that the air/fuel ratio is lean when the supercharger b e g i n s to work in 1000-2000 rpm. I control that with the lamda sensor (but not a wideband, just as indication). Moreover, if you have got a map of emanage blue for 1,6 lt engine with the M45 supercharger I would appreciate to send it to me.
Thanks in advance... :-)

18psi

iTrader: (76)

there is so much wrong with this post that I'm giving up.

good luck with.....whatever you're doing

Peter B.

My english and my explanation aren't good so I can't explain what I mean.
I' ll check it on a dyno with the wideband to make sure that the AFR becomes lean when the supercharger starts to blow.
My problem is how to improve the response of fuel addition in this area. I would appreciate f you have got a map to compare it with mine at this rpm range.

I saw the Christ soldier!!! (in greek proverb) :-D :-D

sharkythesharkdogg

Okay Pete, here's what we've said, and then what you've said.

Pete: "I seem to have a weak range down low in the RPMs on my supercharged 1.8l using a piggy back system.

Others: "Sounds like possible/probably a lean issue that your piggy back system can't handle. We've personally seen cases like this in the past using the supercharger system you're using with piggy back systems similar to the one you're using. It's because engine management systems like the one you're using aren't really engine management systems. You'll most likely need something better."

Pete: "Okay, it seems to be lean between 1,000-2,000 rpm. I'm controlling this with a narrow band gauge (but not actually controlling). How do I fix it? Can I get a map?"

People have already told you. Those systems struggle with that issue. You're probably not going to get around it using eManage.

If you want a map, you can try here. There's a reason that thread hasn't been touched in years though. Good luck anyway.