59 replies to this topic

[siztenboots]

the 2.0L LNF Ecotec


"High Pressure Fuel Pump
The high pressure fuel pump is a mechanical one cylinder design driven by an additional three lobe cam on the camshaft. High pressure fuel is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a magnetic actuator which controls the inlet valve of the high pressure pump. The ECM provides battery voltage on the actuator hi circuit and ground on the actuator low circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled and the inlet valve is held open with spring pressure. When activated, the actuator low circuit driver connects the low circuit to ground and the actuator hi circuit driver pulse-width modulates (PWM) the hi circuit. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the FRP regulator with the position of each of the three camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail. The high pressure fuel pump also contains an integrated pressure relief valve."



hard top see on this pic, I will try and get a better one

"The fuel injection system is a high pressure, direct injection, returnless on-demand design. The fuel injectors are mounted in the cylinder head beneath the intake ports and spray fuel directly into the combustion chamber. Direct injection requires high fuel pressure due to the fuel injector's location in the combustion chamber. Fuel pressure must be higher than compression pressure requiring a high pressure fuel pump. The fuel injectors also require more electrical power due to the high fuel pressure. The ECM supplies a separate high voltage supply circuit and a driver circuit for each fuel injector.

The fuel injector assembly is an inside opening electrical magnetic injector. The injector has six precision machined holes that generate a cone shaped oval spray pattern. The fuel injector has a slim extended tip in order to allow a sufficient cooling jacket in the cylinder head."



The JSJ is the Supercharged version of the LNF. It was used in the Cobalt's and Ion Redlines.

and I want one !

[alanoo]

Wrong, the LSJ and LNF are totally different The Saab turbo B207x and LSJ are the same apart turbo vs supercharger but the LNF even if turbo is not the Saab (at all actually)

Edited by alanoo, 29 October 2009 - 02:33 PM.

[siztenboots]

Wrong, the LSJ and LNF are totally different

The Saab turbo B207x and LSJ are the same apart turbo vs supercharger
but the LNF even if turbo is not the Saab (at all actually)

J S J = Direct fuel injection , not LSJ

L N F = 2.0L SIDI VVT Turbo Engine as used in the and Soltice GXP (and Sky Redline)

wierd piston

Edited by siztenboots, 29 October 2009 - 02:40 PM.

[vocky]

LNF is vvt LSJ / SAAB B207* / VECTRA Z20NET are very similar

[siztenboots]

LNF is vvt

LSJ / SAAB B207* / VECTRA Z20NET are very similar

similar to the point of engine mounts and gearbox compatible ?

[rabidh]

Nice pic of the piston! Anyone looking at Z22SE.org.uk probably noticed I've fitted the LE5 (2.4L, VVT) to my VX220, with ITBs and a new ECU - so if anyone is interested I can give some details and photos about how the GM VVT system works. The direct fuel injection looks pretty interesting - however I think it pretty much means there's no chance of using an after-market ECU

[rabidh]

similar to the point of engine mounts and gearbox compatible ?

As I understand it, they all use effectively the same block. Definitely my LE5 with a GenII block bolted straight on - to the gearbox and the engine mount. The only difference was the addition of a built-in oil cooler which meant I had to move the header tank over an inch.

[Duncan VXR]

Nice pic of the piston!

Anyone looking at Z22SE.org.uk probably noticed I've fitted the LE5 (2.4L, VVT) to my VX220, with ITBs and a new ECU - so if anyone is interested I can give some details and photos about how the GM VVT system works.

The direct fuel injection looks pretty interesting - however I think it pretty much means there's no chance of using an after-market ECU

Sounds interesting

[siztenboots]

Nice pic of the piston!

Anyone looking at Z22SE.org.uk probably noticed I've fitted the LE5 (2.4L, VVT) to my VX220, with ITBs and a new ECU - so if anyone is interested I can give some details and photos about how the GM VVT system works.

The direct fuel injection looks pretty interesting - however I think it pretty much means there's no chance of using an after-market ECU

Sounds interesting

it gets better, our Cobalt LNF cousins are over 500whp!!

http://cobaltss.net/...ad.php?t=192648

[cheeky_chops]

LSJ / SAAB B207* / VECTRA Z20NET are very similar

regal recently remapped the z20net - 300bhp on 97ron from just a remap! (IIRC they are 220bhp std so not sure if it had a full zorst to start with as it had 245bhp)

http://regalautospor...t-ecu-upgrades/

Is the z20NET a twin turbo?

[theolodian]

Nice pic of the piston!

Anyone looking at Z22SE.org.uk probably noticed I've fitted the LE5 (2.4L, VVT) to my VX220, with ITBs and a new ECU - so if anyone is interested I can give some details and photos about how the GM VVT system works.

The direct fuel injection looks pretty interesting - however I think it pretty much means there's no chance of using an after-market ECU

I wouldn't rule that out, at least not for too long, but it is hard to get higher capacity injectors. The advantages are much better control of AFR, atomisation, and cooling of the cylinder charge. However, they are hard to really crank up the power or the rev limit. The Vectra 2.2 direct injection is supposed to be a turd as well.

[siztenboots]

[rabidh]

http://www.skyroadst...lnf-engine-3721
"The Ecotec 2.0-liter Turbo uses a stronger "Gen II" Ecotec engine block ... This architecture is shared with the 2.4-liter Ecotec engine that debuted in the Pontiac Solstice roadster."
So I guess the block itself will fit, looks like it has the same VVT system too.

I guess you might have to mod the boot a little (lot)? There wouldn't be any room for the turbo's cold-air output on a normal VX220.

Did you mention this might be replacing a tubby? If so I guess you'd want the NA's gearbox and maybe the alternator, starter + starter/alternator wiring harness (as they're a nice self-contained lump on the VX220 NA).

[siztenboots]

http://www.skyroadst...lnf-engine-3721
"The Ecotec 2.0-liter Turbo uses a stronger "Gen II" Ecotec engine block ... This architecture is shared with the 2.4-liter Ecotec engine that debuted in the Pontiac Solstice roadster."
So I guess the block itself will fit, looks like it has the same VVT system too.

I guess you might have to mod the boot a little (lot)? There wouldn't be any room for the turbo's cold-air output on a normal VX220.

Did you mention this might be replacing a tubby? If so I guess you'd want the NA's gearbox and maybe the alternator, starter + starter/alternator wiring harness (as they're a nice self-contained lump on the VX220 NA).

already started mentally ( in more ways than one ) planning the packaging , hopefully will keep it as OEM as possible.

[techieboy]

already started mentally ( in more ways than one ) planning the packaging , hopefully will keep it as OEM as possible.

SC'd, turbo'd or twin charged?

[siztenboots]

anyone heard of Hp Tuners software for the lsj lnf etc ?

[techieboy]

Yep, very popular in the States. Just unfortunately not compatible with the Z22SE ECU else we'd all be using it.

[vocky]

Exmantaa has the LSJ engine and ecu, he would be able to answer many questions on the conversion.

[siztenboots]

Exmantaa has the LSJ engine and ecu, he would be able to answer many questions on the conversion.

hp tuning , does seem to be quite good from looking over the forums.

hmm Bosch MED9.6

Edited by siztenboots, 29 October 2009 - 04:40 PM.

[techieboy]

Yeah. very powerful and seems well worth the money if you've got a supported ECU and have a vague understanding of how not to break things.