Does anyone have or heard abou any chip which runs for 555cc injectors and 18psi of boost ??

you can buy ECU chip's that work with 555 injectors and have your boost controller set so it does 18psi ...

but must be a very good Stock block or uprated one to use that kinda boost ....

 

Mark

The boost isnt controlled by the ecu in these cars, to raise the boost its either done by a stand alone boost controller or by putting boost jets in, not normally recommended.

 

You need to change the ECU chip if you intend to run higher boost so that the fueling map is suitable to avoid leaning the engine out. Obviously if you put more air in the cylinder (under pressure, boost) you need to put more fuel in to keep the AFR at an acceptable level. Otherwise you'll risk pre-detonation or det, and blowing the pistons to bits.

 

I'm sure John Dixon will have something suitable "of the shelf" for you to run 18 psi with 555 injectors, however as said above that is alot of boost, its generally said not to go past 14/15psi on a stock block thats approaching 20 years old. Its also been said that the stock turbos are not much cop after that pressure either, 16psi being about the limit before they run out of puff.

 

However if youve a rebuilt engine thats been strengthened and bigger turbos fire away!

So 14/15psi is about max boost for a stock block?

 

therefore assuming all the usual upgrades (rad/intercooler/twin air intakes/EBC/EMS/decat exhaust etc) have been taken care of, what power/torque figures do you think are achievable on a stock block with stock turbos, running 15psi with the following injectors fitted:

 

555cc injectors =

740cc injectors =

800cc injectors =

 

I'm just curious

Injectors ain't the problem its the stress your putting on the internals you could have 1000cc injectors and still not be able to run more than 16psi because, no1 the turbos will be out of puff and no2 the pistons will be getting put under a lot more strain than they are designed for,

 

As for the original question id just bite the bullet and pay for a custom map at least you can then have a high and low boost map so your block isn't always under that pressure plus you'll probably make more power and because of high and low boost your block might last more than 10 mins lol

So 14/15psi is about max boost for a stock block?

 

therefore assuming all the usual upgrades (rad/intercooler/twin air intakes/EBC/EMS/decat exhaust etc) have been taken care of, what power/torque figures do you think are achievable on a stock block with stock turbos, running 15psi with the following injectors fitted:

 

555cc injectors =

740cc injectors =

800cc injectors =

 

I'm just curious

 

Well the larger the injector wont actually matter, its just the ability to supply more fuel. Imagine youve got enough traffic to fill a two lane road (or need enough if that makes sence) for 15psi, they might be at say 70% duty cycle (where as stock injectors will be up at 90-100) by making the road bigger, 3, or 4 lanes you'll just reduce the duty cycle of the injectors, so an 800cc injector will be down to 50% uttilisation.

 

If the analagy makes sence? Its been a long day!

 

However if you had a block and turbo chargers capable of supplying/supporting 18 psi, 20psi what ever you would need more fuel as youve got more air so then you might reach the top of the 555 injectors and would need 740's etc