Innovate (Sprintex) Supercharger Owners Topic

[riboyster]

Originally Posted by ajcarson11

Hmm... Yeah mine is stuttering enough that's it's driving me a little crazy in traffic. The power band unless I'm wot feels like it has at least 3 consistent dips around 2400, 2800, and 3200. I can feel it in the rear Everytime it dips. Hmm...

Could be bad timing in areas. What's your IAM?

[ajcarson11]

Originally Posted by riboyster

Could be bad timing in areas. What's your IAM?

It very well could be bad timing -- But I think Mike would have spotted if it was really rough. Here's the latest log that i've taken. Mike made a few changes since looking at this log --

http://datazap.me/u/ajcarson11/725mm...e?log=0&data=6

I'm sure a dyno-tune in person (rather than e-tune) could probably solve this. I'm just wondering if there isn't some leak i'm missing somewhere. I've got tight hose clamps on every single connection. I've sprayed electrical cleaner around all the fittings checking for rise/fall in RPM, and i've retorqued all of the bolts.

It's so close to being perfect for me -- just the dips make it a strange experience some times.

[riboyster]

Looking at your log, you appear to be running a tad rich or lean when it happens. If I were to make a guess, I'd say its a problem with fuel injection. Your target/actual AFR is consistantly inconsistant at the RPMs you mentioned.

It's at points too lean, and at other points too rich. The fact that it riches means that you don't have a vacuum leak, and fact that it leans leads me to believe that your airflow isn't being restricted. You'll also notice that your ignition timing gets pulled pretty drastically at around 2700.

I'm thinking there's something going on with your fuel injectors. Ask Mike if they have any way of diagnostically testing them. Strange behavior indeed though. Do post the solution if you guys get a handle on it.

[Kodename47]

Originally Posted by riboyster

Looking at your log, you appear to be running a tad rich or lean when it happens. If I were to make a guess, I'd say its a problem with fuel injection. Your target/actual AFR is consistantly inconsistant at the RPMs you mentioned.

It's at points too lean, and at other points too rich. The fact that it riches means that you don't have a vacuum leak, and fact that it leans leads me to believe that your airflow isn't being restricted. You'll also notice that your ignition timing gets pulled pretty drastically at around 2700.

I'm thinking there's something going on with your fuel injectors. Ask Mike if they have any way of diagnostically testing them. Strange behavior indeed though. Do post the solution if you guys get a handle on it.

All of this makes it unlikely to be injectors, especially if it's not happening at WOT.

Stuttering tends to be caused by either mixtures too rich or too lean to make power, especially when on part throttle as this is quite easily overlooked. This could also cause timing to be pulled, which would exacerbate the situation.

[riboyster]

My money is on a fueling problem.

Too lean or rich would be broad spectrum, unless there's some sort of valve malfunction in the charger.

[ajcarson11]

Originally Posted by riboyster

My money is on a fueling problem.

Too lean or rich would be broad spectrum, unless there's some sort of valve malfunction in the charger.

The charger is indeed used -- Not sure how i'd identify a problem with it really without sending it back to Sprintex, or having it checked professionally (which is tough in my area). Mike did pull "low-load low-rpm" timing to see if it would help. I think it did help but its still quite noticeable at low and medium throttle.

Not really sure what my options are -- You'd think that if it were a valve malfunction in the charger that it would get worse with load or RPM. Injectors seem unlikely (based upon the fact that i had no issues previously). But Hm..

[riboyster]

Definitely strange. Did the previous user have the problems?

[ajcarson11]

Not sure honestly -- claimed to not have any issues but you can never be too sure. When I drained the fluid for the first time there wasn't a lot in the unit. It doesn't make any strange sounds or strange vibrations that I can tell.

[riboyster]

Man I wish I was there to feel it and figure it out with you

[ajcarson11]

Originally Posted by riboyster

Man I wish I was there to feel it and figure it out with you

It's all good -- Overall I'm definitely happy with the performance at the price point.

I'm more concerned about whether it could cause trouble for the engine over time. It feels unnatural and I can feel the car jerking at times on medium-high throttle if I go from a low-load state to a high load state quickly in 2nd or 3rd gear. If i give it strong throttle (not even WOT, but strong) from 3k on up to redline it does just fine.

[riboyster]

Maybe a little rough on your transmission. But if it works fine on wot then I'm thinking the low torque surges won't be too bad

[CK_Bladesmith]

Originally Posted by ajcarson11

It's all good -- Overall I'm definitely happy with the performance at the price point.



I'm more concerned about whether it could cause trouble for the engine over time. It feels unnatural and I can feel the car jerking at times on medium-high throttle if I go from a low-load state to a high load state quickly in 2nd or 3rd gear. If i give it strong throttle (not even WOT, but strong) from 3k on up to redline it does just fine.

A good rule of thumb that I use for mine is this: Never WOT under 3k rpms. Remember these cars have garbage connecting rods that can't handle torque down low.

[riboyster]

Originally Posted by CK_Bladesmith

A good rule of thumb that I use for mine is this: Never WOT under 3k rpms. Remember these cars have garbage connecting rods that can't handle torque down low.

Exactly. Im glad you're aware of that.

[ajcarson11]

Originally Posted by CK_Bladesmith

A good rule of thumb that I use for mine is this: Never WOT under 3k rpms. Remember these cars have garbage connecting rods that can't handle torque down low.

Certainly. I never give it more than 60-70% throttle under 3000rpm. I've read the horror stories, and I've got an early model 2013. I was nervous from the start

I'm grasping for straws here, but was looking at the log and i'm noticing that around my trouble spots (2500rpm, 2800, 3000/3100) the ignition mode changes from 2 to 3, or sometimes from 2 to 2.25 and then back down. That would be right around where the port injection comes in combination with the direct. I haven't touched the DI injectors -- Maybe I caused trouble when I reinstalled the port injectors? They were off the car for several days sitting on a table as I took my time installing the SC. Is it possible that I could have installed the seals wrong for the port injectors?

I figure i'll give the exhaust system a once-over for leaks around the header as well. I've never had trouble there, but I haven't checked for leaks in that area for a while. I do know that I have a small exhaust leak at the end of the midpipe near the muffler (had an extra resonator installed). I wouldn't imagine this would cause any trouble though.