which injectors?
Discussion
Had Shaun finish mapping the Chim today, (can't recommend him enough to anyone by the way) and the injectors are 100% at about 6k.
Not really an issue because it's rare that i'll be going above there anyway as theres no point. Not dangerous according to Shaun as AFR is still fine and limiter is set to 6400rpm.
But I want to go force induction in the not too distant future I think and am wondering what injectors people are upgrading to?
Mine are Vectra ones currently so according to the specs 250cc
Not really an issue because it's rare that i'll be going above there anyway as theres no point. Not dangerous according to Shaun as AFR is still fine and limiter is set to 6400rpm.
But I want to go force induction in the not too distant future I think and am wondering what injectors people are upgrading to?
Mine are Vectra ones currently so according to the specs 250cc
carsy said:
Yep. My Vectras are coping with 300bhp and plenty left but i`m running a 3.5 bar regulator.
I suspect with FI tho you will need a lot bigger or at least a rising regulator.
This ^ I have calculated that my 1588/Vectra inj at 3BAR will give me a buffer I suspect with FI tho you will need a lot bigger or at least a rising regulator.
I was running them at 3BAR prior to engine work and I had to rescale my Megasquirt VE table by a small amount and my inj duty cycle was agreeable how this changes with the new motor who knows? one certanty it wont be better on fuel I'll tell you that 
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Edited by Sardonicus on Friday 5th June 10:11
They very seldom go wrong so S/H is fine and this is a tidy one (always renew the O ring though) its a direct fit, but dont just fit it better off doing that at the RR otherwise it will be rich everywhere your fuel table will need fuel pulling out or you can rescale via "required fuel/Injector flow" by telling it you now have higher flowing inj's http://www.ebay.co.uk/itm/BMW-E30-E28-3SERIES-81-8...
Edited by Sardonicus on Friday 5th June 12:33
I used bosch red top originally on nicks blown chim they had to run up to 120% which was ok made 330 bhp but upted the pressure with a smaller blower wheel and the injectors just couldnt supply the fuel so fitted a set of bosch green giant 440cc now it only runs around 70% so good control lots in hand no weakening off at the top end.
John
John
I used bosch red top originally on nicks blown chim they had to run up to 120% which was ok made 330 bhp but upted the pressure with a smaller blower wheel and the injectors just couldnt supply the fuel so fitted a set of bosch green giant 440cc now it only runs around 70% so good control lots in hand no weakening off at the top end.
John
John
The duty cycle should not exceed 80% when choosing an injector. I believe this is due (although I could be wrong) in possibly overheating the coil in the injector and reduced accuracy. On my 4.0sc I started with the Bosch reds which I found on the standard 2.5bar regulator was insufficient. I could have changed to a 3bar regulator and I suspect it would have been fine. Instead I opted for the Bosch green giants, these work well on 2.5bar reg and are able to fulfill the engine's requirements at full load and engine speed. In summary, if you are going FI go for green giants, if modified NA the Bosch reds will be fine. If you want the part numbers get back to me. Both injector types are best bought from USA, a lot cheaper there.
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