Why Siemens injectors over bosh?

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04-01-2012, 11:13 PM

rsdan123

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Why Siemens injectors over bosh?

As title really, why are Siemens 55's better then bosh 403's or is it just cause the Siemens are cheaper???
Cheers
Danny

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04-01-2012, 11:24 PM

Rsmat

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Cheaper.

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05-01-2012, 12:57 AM

Dingy

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modern spray pattern and modern injector over an old design also.

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05-01-2012, 01:53 AM

BRAMMER

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My old 403 had to have the nozzle ends chopped off and Siemens no chopping so......

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05-01-2012, 09:15 AM

gray_rs

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I thought there would have been more benefits with siemens rather than just price?

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05-01-2012, 09:40 AM

Karl 3dr

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They're meant to have a better spray pattern aren't they?

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05-01-2012, 10:19 AM

Rsmat

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They flow more than greens. Also

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05-01-2012, 10:22 AM

Paul_RS

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403s are greys though

Direct comparison from 55lbs to 403s, 403 - horrible idle until closed loop was fitted, 55lbs brilliant idle even without closed loop - both on MSD chips.

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05-01-2012, 10:24 AM

Rsmat

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Ooops my bad.

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05-01-2012, 11:07 AM

#10

Jay,

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Quote:

Originally Posted by Paul_RS

403s are greys though

Direct comparison from 55lbs to 403s, 403 - horrible idle until closed loop was fitted, 55lbs brilliant idle even without closed loop - both on MSD chips.

exactly better spray pattern and when your using a big injector an having to close the duration more at idle they handle it properly plus the injector responce is better under load so fuel is better managed

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05-01-2012, 11:36 AM

#11

JamesH

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I've heard the new Bosch 750cc and 1000cc injectors are better than the Siemens range...

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05-01-2012, 03:50 PM

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Psycho Warren

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surely bosch make newer design injectors to similar parameters as siemens??

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06-01-2012, 01:00 AM

#13

Dingy

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Quote:

Originally Posted by Paul_RS

403s are greys though

Direct comparison from 55lbs to 403s, 403 - horrible idle until closed loop was fitted, 55lbs brilliant idle even without closed loop - both on MSD chips.

My guessing is its not mapped properly then.

I have 83lb siemens no closed loop and its perfect.

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06-01-2012, 09:08 AM

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gray_rs

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Quote:

Originally Posted by Dingy

My guessing is its not mapped properly then.

I have 83lb siemens no closed loop and its perfect.

I think you have misread the above , because he is saying he never had closed loop with Bosch and it's idle was not great but using siemens still without closed loop and it was better

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06-01-2012, 09:49 PM

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stevieturbo

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Quote:

Originally Posted by warrenpenalver

surely bosch make newer design injectors to similar parameters as siemens??

Better...most of the modern 1000cc and bigger stuff now are Bosch variants.

I think they also do some around 800cc as well now

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06-01-2012, 10:02 PM

#16

Rollinz

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siemens 83lbs

14.3 AFR tick over,
drives as good as my 1.6 runaround and thats with no closed loop on DTA managment.

swapping them tho for ID1200 "injector dynamics, 1200cc "