3266 replies to this topic

[The Batman]

Yup got his map so I believe the afr should be spot on as out engines aren't really that different and I doubt I will have alot more! Also speaking to exmantaa and he thinks that at nicks hp we are practically maxing out the VXR injectors

[NickB787]

although mine will be more powerful

Bitch.

funny I was thinking the same

[Exmantaa]

Yup got his map so I believe the afr should be spot on as out engines aren't really that different and I doubt I will have alot more!

Also speaking to exmantaa and he thinks that at nicks hp we are practically maxing out the VXR injectors

Yeah, that's based on some injector flow measurements MarkV did recently:
Grey Z20LET: 365cc/min @ 3.8Bar
GM LSJ: 406cc/min @ 3.8Bar
Blue VXR injectors: 442cc/min @ 3.8Bar

The VXR's seem to flow far less then the 470cc@3bar you see them everywhere specced and think they will be really stretched with 378 SC-BHP's. (so 400+ on the pistons)

[NickB787]

Think Courtney's run it at @4.5ish bar

[Exmantaa]

I read that in your topic and was probably needed to get them fuelling enough, but 4.5bar will only make them ~476cc/min according to Markv's measurements... There are "calculators" that estimate possible horsepower from a certain injector fuel flow and 476cc is not making for a safe 380Hp... But I'm no mapping expert and hope something is simply fishy with the calcs or those flow measurements and you make a safe 380+ without 100% dutycycle.

Edited by Exmantaa, 12 December 2011 - 05:51 PM.

[The Batman]

How do they change this? With the ecu? Also nick you know I'm only playing! Also as I have piston oil jets I don't need to run as much fuel as nick does as I don't need to cool the pistons down with over fueling

Edited by joe_589, 12 December 2011 - 05:52 PM.

[Exmantaa]

No, base fuel pressure is changed with the rail regulator. (probably simply squish it in...) The ecu does not know how much fuel pressure you run or the injected amount. You simply have to tell him how much. (Normally the injector constant in gram/s, mostly in a table depending on manifold pressure if your run a static fuel system.)

[The Batman]

Hmmm.. I haven't touched my fuel pressure regulator.....

[NickB787]

How do they change this? With the ecu?

Also nick you know I'm only playing!

I know mate

can't possibly say how they do it

[The Batman]

13mm socket and a hammer I imagine

[Exmantaa]

That is the normal method yeah, but done with a manometer bolted to the rail. (borrow from a friendly garage?) Ask courtenay, as the correct base fuel pressure is pretty important for you mapping, especially when you enter open loop mode!!!!

[The Batman]

right just remembered, i have a lsj fuel rail which has a pressure regulator of 67 psi / 4.6bar

[Exmantaa]

Are you still on the wine or is that a special one?? LSJ's normally run a (fixed) pressure of 58psi with a dead-end fuel rail. So no regulator on it, let alone one that give you a corntrolled 67psi...

Edited by Exmantaa, 12 December 2011 - 07:54 PM.

[The Batman]

Pfft don't think so! Just I have been given wrong information! Do a search on the cobalt site and you can see that someone has told me lies!! I will see if I can get hold of a fuel pressure tester and get a hammer and a socket out!

[vocky]

according to LMF this fits the z22se fuel rail

http://www.lmfvauxha....0-5.0-BAR.html

[NickB787]

according to LMF this fits the z22se fuel rail

http://www.lmfvauxha....0-5.0-BAR.html

I have one of these spare if you want one

ahh just checked it's no good for you Joe it's a lovely shade of Blue

Edited by NickB777, 12 December 2011 - 09:00 PM.

[The Batman]

Wanna post it to me nick I can paypal you some money

[NickB787]

Wanna post it to me nick I can paypal you some money

no problem got to find it first pm your address Joe

[The Batman]

no worries now nick, Jon is going to modify one for me

[NickB787]

rats lost another sale