98 TRD 3.4L Turbo , Methanol , LT

oh..well..okay haha

 

If its not setup to see boost (ie, connected to your charge pipes or manifold) it won't increase fuel pressure. In fact, if its connected pre turbo, the increased air flow velocity through the pipes as the turbo spools, will actually be read as vacuum by the regulator and it will decrease fuel pressure. I don't think that's your issue, I think you need bigger injectors but its and easy thing to double check.

 

Cool right....Not sure actual measurements. Solo says +3.5 a side. With my 35s and backspacing I'm not exactly sure. Maybe I can run a tape on it. Fills the Glassworks fender kit good. Think the fenders are 6 or 7" over.....

 

I'm not sure. I figured those injectors would be plenty to get to 400hp.

My FPR reference is from manifold I believe. Would the FPR or MAF be limiting the truck? It's either one of those, fuel pump, or injectors. Not sure......

I put in a Supra Twin Turbo Denson pump.

 

The amount of HP injectors can give you are very subjective and not exact (unless you bought from a very well known manufacturer). Additionally, you generally don't want your injector duty cycle to go more than %90ish so if you want 400 HP, maybe shoot for a bitlarger injectors.

Not sure what you pump is rated at but that could be it as well. But before you rip out injectors and pumps, just verify where the vacuum hose is connected from your FPR.

 

Simply looking at all your FIC software gauges when doing a pull will tell you where your issue is at.

 

Doesn't measure fuel pressure. If his FPR is connected properly, you won't get the rising fuel pressure with the rising boost.

 

True. If he's maxing out idc, fuel pressure would be a good next step to check. Just saying logging will tell you real quick what to focus on. curious to see what is holding him back.

Pile on a bunch of timing at 5k to redline, jk.

32s to 35s is a massive change even with gearing.

 

That's one hell of a color u got there. Is that a dip color or paint?

 

Looking at your graph, it shows your AFR go down to the Valley rich, then back up the mountain lean.

What's up with that?

Good calculator here.

http://www.rceng.com/technical.aspx?UserID=68936555&SessionID=Gg1fKWbjxOtV7mR1FcSZ

Your injectors have enough fuel for 300 BHP easy. However, you are on a Mustang dyno. Which reads lower than say a DynoJet.

At what hp number, did Supra owners swap out their pump for aftermarket pumps?

How many liters per hour is/are the pump/s you have?

What is the MAX duty cycle, in grams per second? 400 g/s, 420 g/s, 440 g/s, etc...?

 

Are you really running up to 8k-9k rpms?

 

No way. Still have the factory limiter set at 5500rpm......not sure why it says that.

 

It's paint. I actually go off road when I'm not at the mall (true story) so I thought dip would be a bad idea...... Went into the paint project fairly blind but it turned out great for me. Learned a lot too since it was the first time using my HVLP guns and compressor for it.

 

Pretty sure it goes way rich when my methanol injection kicks in which is almost immediately in boost. Then leans out because I can't get enough fuel at the top. The pump should be more than capable since it's for a twin turbo Supra.

 

That is why it is important to know the LPH of that pump. OEM Supras only came with around mid 200's hp. Due to gentleman's rule. Therefore the pump would only need enough for that, plus a little % overhead.

Also why it is important to know at which power level, people upgraded their Supra pump. "Should" is just to vague.

 

Try it the other way. Tune your injectors first and as they lean out, engage the methanol kit. If you run it too early in boost, you can loose a little power.

Remember, you are only running rich to use that extra fuel as a heat soak to manage temperatures. The water/methanol is a much better heat sponge than fuel and will manage temps better, but make sure you don't drown out your combustion chamber. If temps get too low, you won't get efficient combustion.

With the meth kit running, you can run it a little lean depending on how much water is being injected. Theoretically, you can keep AFR's at 14.7 as long as you have enough water injected to manage temps.

 

I believe the denso pumps for the Supra is 300lph.

 

Most stock 2jz guys go into 400hp before changing pumps.

 

Once those two points brought up are clear, and we'll assume that they are both accurate, then it comes to injectors, and fuel lines.

Assuming the injectors are good, then just the fuel lines. These are a return system yes? If so, then any restrictions on the return line, primarily hidden in the pump assembly, can cause fueling issues.

All specualtive, but worthy of a check, if you can remember any parts which may cause restrictions.

 

Thanks. This very well could be the issue. In fact I'm quite sure now that you've said it. I thought that pump was capable of more.