Help- 2TGEU stuttering/backfiring on brand new Haltech

[lilcrash]

I've had plenty of bad experience with work shops (one was with this car, on the dyno 10 times, then told sorry we can't tune it). I never pay for anything anymore. If my wife or I can't do it someone I know can.

[king-szeitszam]

Well if you know someone in Brisbane who'd be able to sort this mess out, let me know- otherwise I won't have much choice but to go and talk to another 'expert' in my local area.

[lilcrash]

I suggest starting at the basics, fit a stock dizzy, check fuel pressure.

What suburb are you in?

[king-szeitszam]

I'll have to hunt down a stock dizzy with VR. I have a fuel pressure reg, it reads pretty steady at 35psi. Bit low for EFI but the injectors I have a little too big at 440cc so the installer informed me he decided to run a slightly lower pressure.

I'm in Alexandra Hills, next to Cleveland/Capalaba.

[lilcrash]

That comment alone is why there is something wrong with your car. That is the stupidest thing I've ever heard. Fuel injectors don't just pour in full capacity, the ecu opens and closes them. If he can't tune with injectors that big on your gex2(assuming this is my old engine) he shouldn't have a job.

[caam]

Looks like you need to find more useful friends. Be lucky if all that cost me more then $2500. And that allows $1200 for an ecu.

See if you can borrow a dizzy and test again. I'm pretty sure they just saw you as a young tool and bent you over.

I've got a 2t dizzy cant remember if it will fit though.

10/10 lilcrash hit the spot, let me know if you need a hand with anything.

2T dizzy will work but they sit lower and may hit your ITB's, if not I have a G dizzy here you can borrow

Cheers Cam

[lilcrash]

I'm happy to help where I can, I live a fair drive away so can't be very hands on but I can offer a second perspective.

[king-szeitszam]

As I was typing that very sentence a lightbulb came on in my head. His reasoning was that the injectors are running at the shortest duty cycle possible at idle and apparently anything longer would make it idle like a dog. I forget why he chose the lower fuel pressure but now I'm thinking that while that pressure might work at idle and low rpm, as I'm loading the engine up it might be starving? I have SFA experience with injected engines- I've owned one for... 3 days now- so I'm talking out of my ass here.
Or were you talking in general- this guy is an idiot and therefore it's no surprise something is wrong with how the car runs?
Is gex2 the engine Anthony bought the car with? Looks to be the same in the pictures.

As he said it "it's just a little 1600, these injectors are too big". Could the solution be as simple as boosting the pressure and the changing the duty cycle?

Thanks for the offer mate you're already getting the gears turning in my head so your advice is really helpful.

Edit: Cheers Cam I'll let you know- I'm really worried that this guy is even more of a dropkick than I thought, in which case I'm dreading going back to him. Aside from finding a new dizzy (thanks for the offer I'll take you up on it I think) the other problem is I have NFI how to tune these things, or have any knowledge of the settings. So at some point it'll need to go to someone who does.

[lilcrash]

My wife and I have tuned 2 haltechs to a basic running standard. Haven't touched one since I sold my red ta22 6 years ago but I don't think much has changed. Yeah the car had the gex2 in pieces when I sold it. Was a great motor until I thought I would try to rebuild it. Very quick car.

I was running 534cc in my 3t so pretty sure 440cc isn't that hard to run in a 2t. In saying that my stagea was running 370cc running 24psi boost, alot depends on the injectors them self. And if the injector is compatible with the ecu.

[king-szeitszam]

My wife and I have tuned 2 haltechs to a basic running standard. Haven't touched one since I sold my red ta22 6 years ago but I don't think much has changed. Yeah the car had the gex2 in pieces when I sold it. Was a great motor until I thought I would try to rebuild it. Very quick car.

I was running 534cc in my 3t so pretty sure 440cc isn't that hard to run in a 2t. In saying that my stagea was running 370cc running 24psi boost, alot depends on the injectors them self. And if the injector is compatible with the ecu.

The car is running, basically. I just expect more from an 'expert'- it should be absolutely purring and should have no stutters or blips- because if it does, then I'd be better off with carbs I can tune myself just fine. It's making around 96rwkw at the moment- but he hasn't shown me the dyno sheet and I can't be sure that that's accurate until I see it.

So the injectors and fuel pressure aren't necessarily the problem? I guess it's hard to say, but would it be more reasonable to say that I'd benefit from running the standard pressure again?
They are Siemens Deka IV's- modelled on the Bosch EV6 style. Denso connectors. No reason they shouldn't be compatible as they probably one of the more widely used injectors.

I'm thinking about taking a hard line with him- fix it or else. Looks like it'll need a full retune, if he's going to charge money I may be better going somewhere else, but no idea where. The problem is as I said, I don't know anything about tuning these things- my thinking is that he's done a basic tune and called it quits and not bothered to look into any of the more complicated maps.

Pretty stumped on where to go from here.

[lilcrash]

Siemens are a broadly used brand and there shouldnt be any issues, they should be perfectly capable of idleing at 40psi.

There is no way he can claim it made 97kw when it's not drivable.

Problem is there is no claim or warranty on performance modifications. Judging by your symptoms it sounds like your ignition isn't timed correctly or isn't fiing properly, that's why I suggested the stock electronic ignition,

[king-szeitszam]

Siemens are a broadly used brand and there shouldnt be any issues, they should be perfectly capable of idleing at 40psi.

There is no way he can claim it made 97kw when it's not drivable.

Problem is there is no claim or warranty on performance modifications. Judging by your symptoms it sounds like your ignition isn't timed correctly or isn't fiing properly, that's why I suggested the stock electronic ignition,

I agree, I fail to see how it can make anywhere near that when I'm having trouble depressing the throttle past half way because the engine is so temperamental. At the speeds I'm accelerating I might as well cut a hole in the floorpan and start pushing with my feet.

Yep, I don't expect him to offer any sort of quality assurance at all, and I'm not betting on him having more integrity than 99.9% of workshops out there and feeling like he needs to do a good job and leave a customer satisfied.

As much as I'd love the stock ignition, I've forked out a lot of money to make this thing work in stupid sequential igniton- close to $600 just for the coils since a set failed on me. I'd like to see it work because I'll feel like my money is justified in some small way (even though it'll probably take more to fix).

With that in mind would you recommend taking it back for a retune and get him to fix the timing, or should I run in blind to another shop and hope they do a better job and can fix his screw up?

If this carries on too much longer I will piss off the coils and use the stock ignition, but I'd like to give making sequential work a fair go as I've invested a lot of time and money in it already.

[lilcrash]

I only meant fit the dizzy as a testing measure. If it runs with the dizzy you know how to fix it.

[king-szeitszam]

I only meant fit the dizzy as a testing measure. If it runs with the dizzy you know how to fix it.

Ah right I'm with you now. And as for returning to old mate, versus attempting a new tuners? Don't suppose you'd be able to suggest anyone within a reasonable distance of the Redlands?

[lilcrash]

I'll ask around to see who people recommend.