What exactly does Fuel Cut feel like?

[fourgsixthree33]

What exactly does fuel cut feel/sound like? I know what it is, but I am not sure what happens if I experience it. The reason I am asking, is because I have been dealing with a weird problem for awhile now.

The thing I am experiencing, happens when I am around 15psi. Sometimes a little before, sometimes a little after. It "feels" like the same feeling you experience an intercooler pipe popping off. There is like, a popping noise. Then I let off, and get back on the throttle. But if I am WOT, it will happen again. If I do not let off, the car will buck pretty damn hard.

If I turn the MBC down and run say...10psi, it doesn't happen. I did a BLT before my 6 bolt swap. My FIAV block-off plate was leaking. I did the swap and JB welded the block-off plate on, but it still happens around 15psi.

I have yet to perform a boost leak test because I removed the timing belt to fix an oil leak. It will be put back together tomorrow and I will get a BLT when I can (air compressor is in the shed, but there is snow in the grass so I cannot pull the car up to the shed).

About a month and a half ago, I turned the MBC down so it runs 15psi and I also swapped my injector plugs around as directed my the "1G CAS on a 2G" article. Drove it and this thing didn't happen. I was able to go WOT at 15-16psi steady. Then, it started happening again after a couple of weeks. But, not all the time.

Profile is up to date. Only fuel upgrade I have is a Wally 255.

 

[mitsubishimanic]

in your first post you said you were running a 255 wally. now you have an evo fuel pump sooo which is it

 

[TheFallenJosh]

wow 20psi? i thought the t25 was gassed out around 15psi.

Does your boost gauge drop when you hit this "fuel cut"?

15psi is the "safe zone" Anything after that can cause the shaft to twist, so I've read. So I back off whenever it spikes past that. I don't want to have to replace my turbo until I want too . And I don't really know if it drops or not, it just bucks and I let out of it most of the time.

in your first post you said you were running a 255 wally. now you have an evo fuel pump sooo which is it

different poster man.

 

[Spanky_DSM]

Yeah, your confusing me with the OP.

Mods are:
Evo 8 fuel pump
Stock fuel pressure regulator
Evo bov
intake
full 3 exhaust
18g turbo
and stock boost controller

I had posted this in post #19

 

[mitsubishimanic]

opps i just look at your profile pic saw a white 2g and assumed you were the op. i guess what they say about assuming is true you just end up looking like an ass my bad man.

 

[Eagle96TalonTSi]

opps i just look at your profile pic saw a white 2g and assumed you were the op. i guess what they say about assuming is true you just end up looking like an ass my bad man.

You look silly

 

[Cdc1221]

A T25 pulling at 20 psi?!? Either get something to tune with or back off the boost.

Yes it can, but at that point, putting a blowtorch in your intake would be more beneficial performance wise, and no tuning device is going to help much then

 

[Diamond Star Werks]

What does fuel cut feel like? Go wot and turn your key off at 6k rpm

 

[fourgsixthree33]

Read this...
http://www.dsmtuners.com/forums/articles-tuning-ecu/347103-evo-8-ecu-2g-your-visual-guide.html

And the accompanying thread.

Is the point you are trying to make is the amount of work and wiring needed to run a EVO 8 ECU in a 2G or something else? I stated that my vendor is making a plug and play harness so there is no wiring needed.

What does fuel cut feel like? Go wot and turn your key off at 6k rpm

Good analogy.

I found a couple things that may be valuable in this topic.

My stock intake pipe is torn where it connects to the turbo.

And I never put my 2G fuel rail and FPR on. What would happen with me running a 1G FPR?

I definitely think I have a boost leak (aside from the intake pipe if that is considered a boost leak). The car runs kind of crappy and does not pull nearly as hard as it did with the 7 bolt in it.

 

[Diamond Star Werks]

Thats because 7>6 . You've deff have a boost leak. Nothing would happen if it was an auto 1g. If it was manual your fuel pressure will be 6.5 psi to low.

 

[Cdc1221]

No, its the difficulty people have had with tuning with an evo 8 ecu. Getting a certain rom to work with their car and like knochgoon says in that thread, the learning curve. Not saying you shouldn't use it, just saying you might have some downtime

 

[ShadowTalon]

No, its the difficulty people have had with tuning with an evo 8 ecu. Getting a certain rom to work with their car and like knochgoon says in that thread, the learning curve. Not saying you shouldn't use it, just saying you might have some downtime

The benefit of a plug and play harness is that you can just put your old ecu back in if you have any issues. No major downtime

 

[josh408]

Do a boost leak test. That exactly what it should be. It's real easy

 

[fourgsixthree33]

The benefit of a plug and play harness is that you can just put your old ecu back in if you have any issues. No major downtime

Exactly!

Do a boost leak test. That exactly what it should be. It's real easy

Did a BLT. Absolutely no boost leaks (which is a first for me!).

Noticed my TPS wasn't plugged in. So I plugged it in and was going to take the car for a spin. But, the car wasn't drivable. It was surging like crazy even in gear. Unplugged it, then it was fine.

So, swapped the TPS with a known good one. Now it runs much smoother. I can't find out if I can boost where I used to (15-16psi) until I get another bolt for my MBC. I lost it during a pull the other day and it was only finger tight