i am thinking for the future, and i would like to know what injectors i need to obtain 450cv

i know that there is the grey, but i suppose that siemens which are newer than the grey, are better

but, there is a different siemens deka :

- 55 599cc
- 72 788cc
- 83 903cc

so, if the price is the same, what will be the best for 450cv

 

whats "cv"?

 

Mean BHP

Greys will be fine.

Jake

 

oh yes, sorry, it's the bhp

 

Dunno why people always seem to want to do somet different/more expensive/difficult/time consuming to achieve exactly the same results.

Strange

 

you speak about the grey's ???

 

no

Greys do the job

Readily available

Work perfectly for 450 horses

Job done.

Jake

 

up

 

Unless you go and see Stu @ MSD you may struggle to get a chip for the siemens injectors.

Mind you at that level of power i wouldn't recommend an off the shelf chip anyway.

In order of preference i would either

1) Go with the Siemens injectors if you have an aftermarket ECU.

2) Go with the siemens injectors and speak to Stu about chip / live map.

3) Go with greys and a chip.

If you go with the siemens 55s for 450bhp they will be pretty much maxed out at about 95% duty cycle running 3.5 bar fuel pressure.

I would go with the 72s to give you a bit of flexability and room for future upgrades.

 

thanks

yes, i understand.

But, i am searching somebody to map my car in france, so, i suppose that i will find somebody able to map the siemens

For this power, i don't want a off the shelf chip

 

83lb Siemens running closed loop are my choice here. Walk in teh park at 450. Greys are on their knees at 450. I wouldnt use them.

 

thanks stu

when will you go on holidays in france

i have a lot of job for you

 

so, if i can't have closed loop, the best choice will be grey or 72lb siemens

 

I would think the greys would struggle at to be ok for 450 bhp unless you upped the fuel pressure considerably.

 

why could you not have closed loop? i would have it whatever injectors you use, especially with such large ones

 

yes, but i can't go to blackpool for the live mapping

so, i suppose that french tuner can't map the stu closed loop

 

Just one question regarding these big siemens injectors. Can they be used in a catalysator car that should have low emissions, Escort Cosworth for example? Is it possible to get good enough emissions with them? I'm just asking since I just bought 788cc siemens deka injectors and had msd 1000cc injectors and they were quite crap (huge differences) and I couldn't get emissions correct with them. I just yesterday installed the siemens injectors and it seems that the idle is much better with them so I'll try my emissions again later this week. It does idle wery well with AFR14.7, it will idle even with AFR16 if needed.

 

doesn't matter mate. if the french tuner does you a chip without closed loop, closed loop can simply be added to it afterwards (assuming that the base map values are close enough to lambda = 1 for the closed loop to be able to influence them enough, typically +/- 15%)

 

If you have the car mapped locally and send the (Unencrypted) software to me, then for a fee the software can be made closed loop no problem at all provided the base used is compatible. The Pectel serial datastream can also be added for another fee. There are of course provisions to this offer as no tuner will warranty their work after someone else has adjusted the run program, and we of course will not warranty any run maps that we were not paid to map.

We will of course not alter the run maps made by your tuner, but should anything ever go wrong that is mapping related, naturally the blame will become a tennis ball. lol

It is always more complex than most people initially consider.

 

With closed loop i have had 1000cc pass all UK emissions tests no problem at all. I have not yet tried any larger, but you would need some quite serious power to have to do so.

I muist add, it sould like you have swopped injectors and kept the old software? this is a REALLY bad thing to do mate, please take care.

 

I have aftermarket ecu so the map is now correct I don't use weber marelli since there isn't anyone that can map it in Finland. The emissions in Finland are:
idle: HC less than 100, CO less than 0.5%
+2000rpm: HC less than 100, CO less than 0.3%, lambda 1(+-0.03).

 

Nop problem at all achieving those figures.