Bosch injector help

[alfatim]

Could anyone help with tech data for some bosch injectors please?

I tried Bosch themselves a few weeks ago but they didnt know!!

Red; 0 280 156 038
White; 0 280 150 701
Yellow; 0 280 150 702

Thanks in advance

[chassis 33]

Red 0 280 156 038 If you speak german see this speadsheet http://home.online.no/~niande/diverse it's all double Dutch to me
White 0 280 150 701 240cc/min 16.0ohms 48hp/injector - BMW 3.5L(6 CYL)
Yellow 0 280 150 702 189cc/min 16.0ohms 38hp/injector 43.5psi test pressure ALFA 3.0L V6
The white and yellow info comes from www.home.versatel.nl/mfeijts/SCARB/injectors.pdf

Regards
Iain

[rev-erend]

I've only seen the red and yellow for sale :

www.injectorsonline.com/indivprod.php?c=1

[alfatim]

Thanks Guys

All 3 of these are standard fitment on Alfa's.

Yellow = 2.5 V6 24v
White = 3.0 V6 24v
Red = 3.2 V6 24v

But all 3 have diferent ecu programes, just trying to get the best match for a 2.5 ecu on a 3.2 engine before I get it mapped

[steve_d]

0 280 156 038 is 22.75lb and 14.5Ohm

Steve

[alfatim]

thanks Steve

How do those figures compare with those quoted earlier in this thread against the white and yellow?

It would obviously helpme if the 3 could be compared. The Red do have a 4 hole head whilst the yellow and white are single pintle. Is that for better atomisation or emissions?

When mapped the engine should make 260+ bhp

Thanks

[steve_d]

701 are 22.85lb/h and 16 Ohm
702 are 18lb/h and 16 Ohm
038 are 22.75lb/h and 14.5 Ohm

I know nothing of the technology just Googled those figures for you.

Steve

[chassis 33]

alfatim said:

The Red do have a 4 hole head whilst the yellow and white are single pintle. Is that for better atomisation or emissions?

I'm afraid that depends on the engine. Theory suggests that the 4 hole head, thus smaller droplet size, will give a performance advantage, as te finder droplets will burn more completely and quicker. However some engines contradict this, the classic being the BL A-series which gets more power from larger droplets, and hence its easier to make more power from a set of carbs than an EFi conversion on these engines.

Quite what the metrics around this are i dont know, it may be to do with head design, in cylinder flows, piston speeds etc. Someone somewhere will of done the back to back tests for your engine, the trick is finding them and teasing the information out of them.

Regards
Iain

[wildoliver]

If I am reading between the lines correctly and assuming you have a 3.2 engine and are trying to run it from a 2.5 ecu then I would have thought you would want the 3.2 injectors, as they must flow more fuel.

I would have thought you could get more than 260BHP isn't that what the 3.2 puts out as standard?

[alfatim]

I have a feeling the Red's are 4 hole to help emissions as they tend to find thier way onto engines destined for the States etc.

Alfa have long been known for optimistic bhp figures! So its pretty common to find cars making less on the rollers than Alfa claim. They can however be tuned very well, so on the 3.2 (claim 250bhp) Im realistic about a 260 figure mapped

I also have a 3 litre in a 156 running 3 litre injectors and a 2.5 ecu, its much quicker than my 2.5 production racecar! The 2.5 is sweet but lacks torque. Im relying a little on the MAF to semi sort things until its mapped.

[chassis 33]

alfatim said:

I have a feeling the Red's are 4 hole to help emissions as they tend to find thier way onto engines destined for the States etc.

A more complete burn with give less hydrocarbon emissions (ie unburnt fuel) etc so that makes sense!

Regards
Iain

[wildoliver]

Sounds good fun!

[jchase]

How odd, the 2.5 V6 alfas I had (about 6) had bags more torque than the 3.0 V6 I had (about 5) but they were the 12valve flapper injection jobs in the GTV6 and 75. may have been gearing I guess.

FYI so I'm told the opening time of the injectors is critical, as at low revs the fuel is on for about 1ms, and the opening time is about the same duration. I'd like to know what the fuel temperature does on fuel flow too, as some of the RV8 engines have a fuel temp. sensor. surely it can't change things that much?

-Jim

[stevieturbo]

chassis 33 said:

However some engines contradict this, the classic being the BL A-series which gets more power from larger droplets, and hence its easier to make more power from a set of carbs than an EFi conversion on these engines.

Regards
Iain

Isnt that down to the fuel distribution/charge robbing scenario with the A-series ??

I'd bet any money a 7/8port fuel injected A-series would make more power/torque and be generally better all round, than any carb setup on that same engine.



As for colours, who cares. Buy injectors that flow what you need.