***Topgunz ROTREX C38R Supercharger Kit***

DarkJak

Does anyone know if the Fast Intentions bar will fit this kit? I saw it did with the old A2A kit.

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SwedeZ

I got my car back a couple of weeks ago but I've been away on vacation, so haven't had time to post an update...

In summary, the car runs really great (and sounds amazing) but we had to limit ourselves to 480 whp due to me being on stock tyres. Even with just 480 whp the traction control light flashes now and then on full throttle even i fourth gear (dry surface; highway).

Once I find time (well, money) to upgrade wheels and rubber, we'll bump the power up. Possibly next summer.

However, I have one major issue. Start issues. The engine REALLY struggles to fire. Especially when cold.

My tuner (one local to me here in Sweden) is having a hard time improving it. I have a feeling it could be related to injectors/fueling, but I'm no expert whatsoever. The car had zero issues before the kit got installed alongside Injector Dynamics 1050cc and other supporting mods.

It really, really pains me to start it up. Here's a clip of it. Just before I shot this clip, I attempted another start which I cancelled after 8 seconds by pressing the start button again. It just wouldn't fire up. The second attempt is usually successful but only if I help a little by blipping the throttle. If I don't to this, it'll die right after it fires.



Any ideas? Is this a common issue with large injectors?

JVerge5363

Did you upgrade your fuel pump?

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FX-32

Looks like fuel issue to me, either hardware or bad tuning.
I would start checking fuel pressure during start

SwedeZ

Yes, a Walbro 450.

I'm leaning towards the tune and so is the tuner. Ecutek is being used, but the tuner doesn't have all that much experience with the combination of 370z FI and Ecutek, so I'm confident there's room for improvements in some areas of the map file.

But, yeah, I'll look into monitoring the fuel pressure during start-up.

TopgunZ

Tune

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FX-32

If your tuner says he doesn't have plenty of experience with it, its very honest of him but I would not risk the engine and get a known well reputable tuner.
The tune is what makes your engine last long or last a few pulls.

I suggest asking Aaron from topgunz speedworks for a tuner recommendation experienced with his forced induction kit, Im pretty sure he will put you in contact with the best ecutek tuner and most experienced with 370z

Also, again, it's important to make sure that fuel pressure is on spec, not only while cranking up but also while building boost.

redondoaveb

I'm sure Aaron would recommend Eugene Turkov which would be the right choice

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700+whp

SwedeZ

Thanks for your input, guys. And yeah, I honestly thought that my local tuner had already had a collaboration going with Topgun and someone like Eugene when my local tuner did the mapping for my car on their dyno, but no. Too bad, because it doesn't make any sense to me to not use that option (someone with prior experience with this particular setup).

SwedeZ

A couple of clips from today. It actually starts much quicker today, but still rough and it will 100% die, if I don't blip the throttle at the right time.

The only thing I can thinks of that is different today is a much cooler ambient temp (16C/61F) compared to the previous weeks where it was around 25C/77F or more when I previous tested starting up the car.

I have a fuel return system. Not sure if that is why the fuel system doesn't maintain pressure when I go from ACC to ON. It quickly jumps to 50ish psi and then immediately drops to 0 again.

Cold engine (car had been sitting for a few days):



Warm engine (75C/167F - drive around a little and parked it for 10 minutes prior to firing it up again):



Pressure seems a bit low in the second video clip (warm idle), does it not?

Duke370z

Yep you need Eugene, my car is still on a base tune and it fires up immediately every time.

Do you have a check valve in your RFS? I had to add one to my cjm rfs. Installed it at the in line filter.

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DrBacon

Your fuel pump most likely already had one

FX-32

I think there's something wrong with your fuel system, possibly an internal leak in the fuel pump, because if you from on to off, the fuel pressure can't drop immediately to zero.
In my car it drops slowly, and in about one or two hours it reaches 0 PSi

Pressure is too low, at idle you should have 52 psi +-1 if I remember correctly.

Duke370z

I was told the dw 440 brushless doesn't have one.

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14 sport/touring 6 MT- Motordyne CBE/Art pipes soon to be topgunz sc
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HapaZ

I'd go with what Aaron has to say, but one other thing to consider is your battery. I had a longer than typical start on my original battery from 2011, but replacing it with a new one improved cold starts for me.