Max fuel pressure for 0280 150 945

[Axel Rietschin]

Hi Bernd,

The 403 are huge. My engine was running rough a low load with them probably
because the spray was not so good at short duty. I've replaced them with a
pair of 400 (per cylinder) and this solved my problem of low speed
drivability vs high load flow. Only one injector is used up to about 5ms
then the pulse is split in two and each bank injects half of the fuel. If
you need the flow and can't add more injectors you may want to select the
smallest that will meet the requirement, i.e. provive sufficient flow at,
say 85% duty + a small margin for the operating conditions. I always assume
100% VE when sizing injectors, just to be on the safe side. About the spray
pattern and cone angle I didn't really ask myself too much questions as the
400, 803 and 403 are all used on my type of engine by very serious people,
so I just took for granted they would be compatible.

Cheers,
Axel

----- Original Message -----
From: "Rausch, Bernd" <br at rnt.de>
To: <diy_efi at diy-efi.org>
Cc: <kojab at optushome.com.au>
Sent: Thursday, July 19, 2001 3:57 PM
Subject: AW: Max fuel pressure for 0280 150 945



Hello Axel,

I want to use the 403 (currently 804) injectors at 4 bar with my engine
(3L biturbo V6, 600hp). Do you know what spray-pattern these injectors
have and if they are a good choice ? Are there newer (better) designs ?

Best regards,

Bernd Rausch

-----Ursprüngliche Nachricht-----
Von: Axel Rietschin [mailto:Axel_Rietschin at compuserve.com]
Gesendet: Donnerstag, 19. Juli 2001 14:34
An: diy_efi at diy-efi.org
Cc: kojab at optushome.com.au
Betreff: Re: Max fuel pressure for 0280 150 945


Richard,

I've no experience with the injectors you mention but it might be wise
to
contact Robert Bosch Gmbh; I had some success here in Switzerland, I was
able to obtain the information related to the injectors I use (0 280 150
803
and 400).

For information, I use 400 kPa static pressure (which then raise up to
640
kPa with boost) and I know some people are using 500 kPa static pressure
with the 400 and 403 injectors. Also I vaguely recall having read
somewhere
that 500 kPa was the point of diminishing returns.

That said, you might have a fuel pump issue? Are you using a Bosch 044
fuel
pump? Also the regulator's rising rate should be 1:1.

Hope this helps,
Axel

----- Original Message -----
From: "Richard Wakeling" <kojab at optushome.com.au>
To: <Axel at 9Volts.com>
Cc: <gmecm at diy-efi.org>; <diy_efi at diy-efi.org>
Sent: Thursday, July 19, 2001 1:22 PM
Subject: Max fuel pressure for 0280 150 945


>
> Hi all,
>
>     Finally completed a Delco conversion on a Porsche 911 (previously
> K-jetronic) running 11 lbs boost supercharger.
> Its running lean on the race track and I have been scratching my head.
> Fuel pressure on boost from a rising rate FPR is just on 400 kPa.
>     Does any body know if running 4 bar (400 kPa or 58 PSI) on the
Bosch
> 0280 150 945 red 30 lb/hour injectors is too much fuel pressure.
>     These injectors have 4 delivery holes and I would assume to be of
> the rotary type injector. I have heard that too much pressure can be a
> problem with rotary injectors compared with pintle types.
>
> TIA
>
> Cheers Richard (worried)
>
>
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