Help- 2TGEU stuttering/backfiring on brand new Haltech

[Lambolica]

If you are running no MAP sensor, you will already be tuned using TPS vs Rpm for load (Alpha-N). So no retune at this stage. given the problems surrounding MAP Sensors and ITB's it appears to be more trouble than it is worth to compute load off MAP alone. Hybrid Alpha-N / MAP compensation may be an option once the MAP is stable.

Not sure on ISCV... I haven't got that far, tis currently witchcraft.

[king-szeitszam]

If you are running no MAP sensor, you will already be tuned using TPS vs Rpm for load (Alpha-N). So no retune at this stage. given the problems surrounding MAP Sensors and ITB's it appears to be more trouble than it is worth to compute load off MAP alone. Hybrid Alpha-N / MAP compensation may be an option once the MAP is stable.

Not sure on ISCV... I haven't got that far, tis currently witchcraft.

You've got a better understanding of this stuff than me, I miss my twin carbs
So assuming I can get a stable MAP with my 4 vacuum points and a nice plenum plumbed to the ECU- that'd require a retune to run in hybrid?

[Lambolica]

As far as I know running hybrid is tweaking a compensation map rather than full retune. Like water temp, cold start etc. MAP compensation.

I will state for the record I have about 1 months more knowledge on the subject than you. All theory minimal experience.

[king-szeitszam]

This is interesting- might help you too- Engine management options? [Archive] - Dori-Kaze

Specifically the post halfway down by 'visean'. He suggests a Speed Density multiplied by Alpha N tune. Basically what you said I guess! One map with another running in the background.

His comments on AN only also may explain why I have issues at low throttle on hills.

[Hurricane]

Feeling a bit worn out and there was abit to read but.......

Did you say that when the car stalled that you lost all power? no lights, no cluster, etc? as in the car lost total power?
35psi of fuel pressure seems low for efi, does it increase at all under load or increased RPM?
i know my 3t will not run very well at all that low.

Any idea on the Alternator output voltage?

The vac port for the Brake bosster (if you have one) will work better with a OneWay Valve in the line to hold an amount of vacum or the need for a vacum tank like a diesel motor if only running of one intake port.

I beleave most ITB setups are tuned VIA Throttle Position vs RPM
As for a Vacum reading for a ITB setup you will need to run lines for each intake port to ether one common line or a box with possible a oneway valve in the main line to the sensor? (dont hod me to that though, trying to dig some old info out of my brain)

dan.

[RA35GT]

.Yeah a vacuum log fed from each runner would be ideal source for map sensor,

Nah, don't need a one way valve to the map sensor, the signal is meant to be varying so you want the sensor to see it going up and down.

The booster should have a one way valve fitted from factory. (Don't connect the map sensor to this line).

[king-szeitszam]

Hurricane- I agree that it seems low but until I take it to a new tuner I won't be able to change the pressure. Interestingly as I said earlier the car ran like a dog at 45psi and ran great for 10 minutes at 35psi- that's largely redundant though as 10psi makes a huge difference to the tune. The story behind the 35psi is that apparently 440cc injectors are too big and he's dialled the pressure down to compensate.

I'm looking into the vacuum log now, might have to fabricate something here which will take a bit of time but that's no worries. Probably going to copy HKS7MGT's system which is what I originally gave the installer to throw together (which he clearly didn't do).

So if they best tune is AN (throttle) + RPM where does the MAP fit in?

[king-szeitszam]

Been trying for a few days to get a hold of M1 Tuning but no luck- same with the original installer! Seems like I've fallen into an automotive black hole.

[lilcrash]

It's strange for ben to not answer

[king-szeitszam]

It's strange for ben to not answer

He called me back today, had a short chat about the car and its various problems. Pretty much as I predicted he said it's hard to diagnose over the phone and he'll have to see it, so he's coming up here next Saturday to have a look. Off the top of his head he suggested a MAP set up as a necessity, as there's no excuse for the engine to run like this.

So, one more week of crappy driving ahead- hopefully on the mend saturday.

[Lambolica]

This is what is currently in transit for my MAP blues.



https://technotoytuning.com/toyota/2...ribution-block

The current plan is to drill new pickups in the manifold for each throttle body, run a line into the above block for use with fuel pressure reg & Map. Brake line will come off runners 1 & 4 (1 is sufficient, but I have 2 lines so may as well use them)

I've read some alternate ways of improving the vacuum signal and I'll be testing these theories to see if a single TB plenum like vacuum can be achieved.

Cheers
Simon

[king-szeitszam]

This is what is currently in transit for my MAP blues.



https://technotoytuning.com/toyota/2...ribution-block

The current plan is to drill new pickups in the manifold for each throttle body, run a line into the above block for use with fuel pressure reg & Map. Brake line will come off runners 1 & 4 (1 is sufficient, but I have 2 lines so may as well use them)

I've read some alternate ways of improving the vacuum signal and I'll be testing these theories to see if a single TB plenum like vacuum can be achieved.

Cheers
Simon

Wow that's not too bad at all, comes with all the fittings and looks pretty swanky too- only $50 which can't hurt either. Might invest in one to save me fabrication something.
Hang on- my FPR doesn't have a vac line running into it at the moment- just fuel in fuel out.. have i (or the installers i should say) missed something here?

Yeah once I get tired of how loud the intake is I think I'll go for a plenum/air box design..there's all sorts of literature on how that affects velocity and creates vacuums...will have to dedicate some time to actually figuring out what it all means.

Frank