Sunday i went for a drive in the new zed, its had what i thought was an overfuelling problem (kept stalling/a quick thrash would afterward make the car lumpy and it wouldn't get past 60 without issues and 5th gear just didn't work full stop)

 

It's running 375cc injectors and twin intakes. Having had a word with John Dixon he says it's set up to run with a single maf and a dummy maf.

 

As i came into town after overtaking something (yes silly i know) it started to miss firing on a couple of cylinders and as i went through town it got worse till i was eventually running on 3 as i struggled ot get up the final hill to my house.

 

Pulled into the driveway and it stalled as always. Tried to restart and it wouldn't fire.

 

So last night i took all the coil packs out, all the spark plugs out and gave it an hour to evaporate.

 

In the meantime i checked the plugs. The front right was coked up badly but the other 5 were virtually white?

 

This would suggest to me it's running lean?

 

I topped up the tank with 5 quids worth from a jerry can just to be sure i hadn't ran out of fuel and put everything back in.

 

Started it up and it coughed and spluttered a bit but didn't start and after a few seconds died again.

 

I had a listen for the fuel pump under the car when the ignition was put to position 2 and heard nothing.

 

I'm going ot take the fuel line off tonight and put it in a jar and turn it on briefly to see if any petrol comes out before i go any further but just to clarify:

 

If it's running those big injectors and twin intake (which i'm reverting back to single and john is sending me a new chip) do i need a tt fuel pump or is there no difference?

 

Could the larger injectors, etc have killed the NA pump and the engine leaned out on steady driving? It was alright on acceleration just not on steady speeds.

 

Any ideas guys?

When you say front right what cylinder number are you talking about?

 

Why don't you try changing the ecu for a TT ecu and see if it runs better?

Front right i mean drivers side, the cylinder nearest the throttlebodies.

 

I could try that but my tt's auto and the na (the one with the problem) is manual, does this work then?

That is cylinder No.1

 

Well it seems that you want an ecu, for a single maf and 370 injectors the auto into a manual car will not make a difference, it should run it ok as a temporary measure!

I'll give it a go tonight when i get back. I'm pretty certain it's the fuel pump not running that's causing the problems. I'll check it pumps first, if it doesn't then i'll hot wire 12v directly to the pump to see if it gets it moving if not i know what the problem is.

 

I just hope it's that personally.

 

Where's the best place for a brand spanking new fuel pump? I'm sure i saw a link for one for £80 somewhere?

You can get a warlbro for £60ish quid or a used unti for £40ish, but the warlbro will not run at the same outputs as the oem one!

Clucking bell!

 

You only just got that silver one too.

 

Sorry to hear you're having problems with it already - hope they're easy to sort.

Ahh i knew it had problems before i bought it, Jim's done a cracking job with the car, you should see the engine bay!

 

It just need a bit of tlc in the engine department and it'll be sorted.

 

You can get a warlbro for £60ish quid or a used unti for £40ish, but the warlbro will not run at the same outputs as the oem one!

 

When you say that, you mean it won't pump as much or it'll pump more?

Ahh i knew it had problems before i bought it, Jim's done a cracking job with the car, you should see the engine bay!

 

It just need a bit of tlc in the engine department and it'll be sorted.

 

 

 

When you say that, you mean it won't pump as much or it'll pump more?

 

 

The pump will run different pressures at different rev ranges, the final output is the same, so certain chips will be running slightly out of spec with them!

The pump will run different pressures at different rev ranges, the final output is the same, so certain chips will be running slightly out of spec with them!

 

Ahh right, that's no problem i'm going ot take the car to John when it's finally moving again to get him to tweak it anyway and make sure it's set up properly before i even think about trying the NOS setup up.

what twintake has it gt nick? might buy it off you

It's running 375cc injectors and twin intakes. Having had a word with John Dixon he says it's set up to run with a single maf and a dummy maf.

A nice set up. Same as mine or are you using the "doolz" jobby

 

Pulled into the driveway and it stalled as always.

Do you have the idle stabalisation pipe fitted ? (Depends on doolz again)

 

Tried to restart and it wouldn't fire. So last night i took all the coil packs out, all the spark plugs out and gave it an hour to evaporate.

Sounds familiar ;)

 

In the meantime i checked the plugs. The front right was coked up badly but the other 5 were virtually white?

That doesn't sound familiar :confused:

 

Started it up and it coughed and spluttered a bit but didn't start and after a few seconds died again.

That happens without the idle pipe too

 

I had a listen for the fuel pump under the car when the ignition was put to position 2 and heard nothing.

It only runs very briefly without the car running or cranking

 

I'm going ot take the fuel line off tonight and put it in a jar and turn it on briefly to see if any petrol comes out before i go any further but just to clarify:

Cool

 

If it's running those big injectors

Standard TT injectors are 370 cc :confused: Or are you still running as a NA?

 

and twin intake (which i'm reverting back to single and john is sending me a new chip)

Shame (but single intake is easier)

 

do i need a tt fuel pump or is there no difference?

The TT pump has a higher flow capacity.

 

Could the larger injectors, etc have killed the NA pump and the engine leaned out on steady driving?

It wouldn't kill the pump. If you driving it really hard and didn't have the right sized pump, it would lean out at the top end.

 

Things to note:

If you are running dual intakes, you can't run a standard ECU / chip. The "doolz" and dual setups need custom chips to make things run properly.

 

If you have the "doolz" you dont need the idle stabalisation pipe but if you are running a dual set up you will.

 

If you are running as an NA, i doubt the pump would have run out of supply volume unless you have lots of mods to increase power.

 

If you are running as a TT, the NA pump wont deliver and you will lean out horribly.

I hope my ramblings were of some use to you. If not, say so and I'll go back under my rock :)

It's this one as far as i know (which i think is the doolz you're talking about?)

 

http://www.z1motorsports.com/product_info.php?products_id=62&osCsid=bc5e4c941

 

I'll take some pics when i get back in tonight, so do i need an idle stabilisation pipe?

 

The engine is an NA running TT injectors as far as i know, check my rides section for all the details

 

Thanks for your help buddy

Why don't you contact the seller confirm what it has, then revert it back to a single maf?

 

If you don't do this you will be just chasing your tail, not knowing which mod or defect is causing you grief?

It's Jim Jitsu, i gave him a shout last night and he's never had problems like that before. He's said to check the fuel lines as the nitrous connects into them.

 

Could be a leak, could be the fact the pump is knackered.

 

Either way it would explain the poor running recently but i did know the engine's not set up properly yet

I'll take some pics when i get back in tonight, so do i need an idle stabilisation pipe?

That is the "doolz" and no, you don't need the idle stabalisation pipe. From memory you do need a custom tuned ECU as that setup can flow around 70% more air than standard.

 

Check the K value of your ECU. It needs to account for doolz and injectors.

 

E.G. Standard K for a TT (you will need to find the NA value) is 288. As you are only seeing 70% of the airflow you need to increase K by a factor of 1.43 (1/0.7) = 412 to prevent lean out. As the injectors are now 37% bigger (370/270) you need to reduce K to prevent overfueling. 412 / 1.37 = 300. As you can see the change is minor as a percentage but will have a huge effect especially around idle.

 

Overall effect is K x 1.04

 

I hope I have my maths right and if anyone else can add there input that would be great.

 

Thanks for your help buddy

No worries - HTH

I think he may have found the problem :(

 

http://www.300zx.co.uk/forums/showthread.php?t=97341

Cheers matey, well the engine is dead and i'm pretty sure of that and tbh when i get the new stock unit through all i'm going to do is fit the stock pipework back in, leave the injectors as stock and just forget the small power increase i'd get by running the larger tt injectors.

 

it's too much hassle for the 10-15 bhp i'd get over all and the car is going ot be my day to day car anyway.

 

Thanks for all your advice though matey, if the engine were salvageable i'd have got it set up correctly but i can't afford to do this all the time.

 

Speedfreak looks like the doolz is up for sale buddy

 

Cheers,

 

Nick

I think he may have found the problem :(

 

http://www.300zx.co.uk/forums/showthread.php?t=97341

 

lol :D

:eek: :eek:

 

FFS Nick, that's so shite. Sorry to hear this mate.

Don't know what to say, but stay clear of sharp knives etc. ok?!

lol, mate i've got bigger worries to worry about than car engines blowing up atm so not overly bothered.

 

Getting the purple tt sold and 3k back to my bro is a bigger worry so taking all the none standard parts back off and putting it up for £2500 at the weekend

I believe jim fitted the TT injectors to supply enough fuel for the NOS setup. If you dont intend to run Nos on the new engien then yes you could retain the NA injectors.

 

The doolz setup causes far more problems than its worth. I had John map the ECU for the TT injectors on that car when it was having Manual conversion done and the biggest headache for mapping was the Dual intake, which is why it was only running a tempoary map.

Yep, john is actually sending up a new chip set up for single intake but its a bit late now i guess. May be worth keeping for the new engine if i decide to keep the tt injectors

Sorry to hear that. I was going to suggest a compression check but then I got side tracked.