carbs or injection?

[JakeH]

hi

i have a 2.0 zetec black top for my build but am a little unsure wether to use the original injection system or switch to carbs and a megajolt?

originally i was going to use the injection system but after testing the spray patterns of the injectors 2 of them are buggered :( and not cheap to replace!

iv never really used/played with or even learnt about carbs so may need a little help here :o

are there any benefits or drawbacks to using carbs over injection? other than the mass of engine management wiring and ECU's? i know that injection is able to be "finer" tuned but would this be an issue on a track day car? all the computers and sensors needed means theres a higher chance of something going wrong!

what have other people used? would anyone recommend a certain set of carbs? (was thinking bike R1 or Fireblade) theres a few sets on ebay for not too bad money

any help and advice much appreciated :)

Cheers

[twinturbo]

Personally, unless for some reason it's impossible. I would always go for EFi

I converted our MK1 golf from carb to EFI.

There's not actually that many sensors and most of them are designed to last a very long time.

I would find some spare injectors on ebay , perhaps have them cleaned too.

There are no real advantages to a carb over a EFI system especialy if you retro fitting it to a car that was never supplied with a carb.


TT

[Bonzo]

Hi Jake

I am probably not the best person to fully advise .... I come from an age when engines were clockwork, well nearly, my first car had a starting handle :o :D

Guess it is all going to be down to the amount of money you want to spend to achieve the performance you desire !!?? ;)

Cheapest
Stock ECU & original OEM set up ( If you can get it all to run ) .... Blacktop fuel injectors shoud be reasonably cheap if got at the breakers.

Mid price

Ditch the injection & go with bike carbs n Megajolt.
Suzuki GSXR carbs are quite popular as they are relatively easy to respace to fit a bespoke inlet manifold.
You'll have to resolve any carb jetting issues & emissions can be a problem to get, spot on for a road car ( Probably wont be an issue for you if your car is going to be for track use )

Most costly

Jenvy or bike throttle bodies with aftermarket ECU.
More or less a case of, how deep is your pocket ?? or how competitive do you want to be ??

[les g]

erm.
bit of a no brainer really
as a blacktop is a late engine you will have to fit a cat
and comply with cat emissions and it is not possible to get the emissions low enough to comply on carbs
so its fuel injection for you i reckon :)
cheers les g

[TSM Locost]

Injection = no contest as Les says. 4 injectors cleaned an serviced inc p&p 24 hr service £56 all in. did mine and came back with full report of before and after.

http://stores.ebay.co.uk/The-Engine-Tuning-Shop?_trksid=p4340.l2563

[mark]

If its only a track car then carbs would give you more power than a standard injection set up

Most 2lt blacktops will put out about around 150/160bhp if properly set up on bike carbs some people say more, some less

Im running carbs on an st170 engine at the moment and have been in a 2lt blacktop on carbs and the throttle response is superb

Im using zx6r carbs/megajolt which seem to work very well, zx9 carbs are popular too

If going bike carbs remember to factor in the cost of a rolling road tune to get them running properly, you can get them somewhere near diy style as its been done so many times you will be able to fit some new jets and download a suitable map but to get the best out them it needs doing properly on a rolling road

[flyerncle]

Carbs are much less hassle and be easier to tune.

[les g]

well the answer is simple
is your car gonna be road legal and IVA,d
you cant get a blacktop through iva on carbs
cheers les g

[Davey]

Carbs are easier to set up but not easier to achieve emissions standards. Basically carbs are........... well basic! Injection on the other hand is much more tunable once you know how and have the apropriate equipment. Semi sequential is pretty easy to set up on a rolling road, full sequential is a viable possibility but again needs setting up on a RR, then again carbs are probably best set up on a RR so what's not to like with injection?

D.

[flyerncle]

Track day cars do not need an IVA...... Carbs :p

Just re-read the post Les....

I gas tested a Scooby the other day with no cat and flew through test.

[twinturbo]

Bike throttle boddies and emerald.

Will be quicker to RR tune. so cheaper.

Yes the hardware is more expensive than carbs + Jolt. But the ultimate power and torque from the EFi is worth it in my opinion.

TT

[JakeH]

cheers guys, good information :) decided to go with injection, know a very very good auto electronics engineer who WILL help me for free :p haha

just wondering if anyone has a 1999 2.0/1.8 zetec wiring diagram? at the moment have the loom laid out on bedroom floor (mother wont be happy) and trying to figure out whats what!

Cheers

[baz-r]

run what ever efi inlet you want off megasquirt that way you can chuck most of the rubish std inj stuff and run just the bits you need
you dont have all the antitheft things either
could use the std black top inlet but its big and your going to have steering shaft clearince issues and bonnet line issues with the air intake to the throttle
i was given a blacktop inlet to see if it was any good for my silvertop zetec but i think its not going to fit

[les g]

Track day cars do not need an IVA...... Carbs :p

Just re-read the post Les....

I gas tested a Scooby the other day with no cat and flew through test.

eerm....... bet the scooby wasn,t on carbs
my daughters a3 went through the test without the cat
200+bhp (r-tech tuned and mapped) on the rollers Saturday
but we all know it aint right
cheers les g:p

[flyerncle]

No and agreed its not right, but.......

There is nothing in mot regs to say that a cat must be fitted it just has to comply with emissions in analyser.

And just to complicate matters the race roadster I am building has
Jenvey tb's on and Pectel 500 ecu to control the lot.


Carbs on my car though.