l67 supercharger onto 3.8 n/a v6

[M3ZZA]

Hey there i have a 99 vt v6 and i am considering putting on a l67 supercharger on it.

Besides the blower and the fuel rails and accalerator cable braket,injectors what else is involved ?

Do you need any special wiring for the l67 blower to work ?
And with the ecu side off things do you need to put a l67 ecu in and would it be as simple as plug in and play.

Will it bolt straight on or do you need l67 heads aswell ?

[VY Rossi]

As far as im awhere the l67 has a different, stronger bottom end and it also has a different compression ratio as for the ecu side you could get yours tuned to suit the blower or if u got a l67 ecu it would still need to be tuned depends on comp and differences between the ecotec and l67

[TI3VOM]

Step one: search L67torque.com

Step two: there is none

That website will tell you everything you need to know for that kind of conversion.

[kniever]

injectors are in the heads on the l67 so you will need heads too, bottom end was the same except different pistons, also dont forget you will need the extra pulleys for the charger belt too

[klampy]

what is the actual difference in the bottom end of the two engines? and im talking just the block. is an L67 block actually any different to an NA block?

[wraith]

You can pick up a complete L67 with harness for about 2.5k

[Trayner]

hit up L67torque.com , I was going to buy the charger off ebay , but after reading a bit the stock bottom end of a ecotec can only do minimal boost from the eaton blower were as a l67 block you can mod it up to like 20 psi before it blows

[monkeys437]

what is the actual difference in the bottom end of the two engines? and im talking just the block. is an L67 block actually any different to an NA block?

L67 has lower compression ratio and I think also stronger piston crown, and stronger rods.

[klampy]

yea i knew that. lol.

i had a look on L67 torque and between the two engines, the block is the same, the crank is the same, and the cam is the same just on different timing, and the heads are also the same, bar the injector bosses being drilled out.(but that is the only difference.)

so the rods and pistons are different to allow for a lower compression, with the later models getting a coated piston for strength.

[Tsunamix]

Problem with tje L67 blower is that it dumps very hot air into the heads. This increases the chance of pre ignition. Thats why the L67 block has dished pistons for a lower compression ration.

L67 Bottom end is substantially stronger. That being said - can get up to 10PSI on a std L36 without damage IF (important IF) you keep your intake temps cool, using something like a Raport of a PSI centripetal blower, rather than a screw type.

[klampy]

L67 Bottom end is substantially stronger.

the only parts that make an L67 block strong are the Rods/pistons. everything else is I D E N T I C A L.

[zapper-l67]

The difference between a standard v6 l36 and a Supercharged L67

Rods - Larger rod which is stronger. The gudgeon (wrist) pin is also larger.

Pistons - These have a coating on the top of the piston. They are also larger in the dish, which drops the compression to 8.5:1

Heads - The heads on the Pre VX Ecotecs are identical to the L67s. However, the L67 heads have a hole drilled into them for the injector. This hole is drilled into a boss that encroaches into the inlet port. The post VX2 ecotec heads (from what I can gather) do not have this boss. They have a clean/straight inlet port.
Any pre VX Ecotec head can be turned into an L67 head with the right drill bit and the hole drilled at the correct angle.

Balance shaft - The L67 balance shaft is weighted differently to the Ecotec

Flex plate - The L67 Flex plate is balanced differently to the Ecotec Flex plate

Harmonic balancer - The L67 HB has an extra set of grooves for a second belt (the blower belt) It is also balanced differntly to the Ecotec HB.
The L67 HB and flex plate have to be used together.

Coil Packs - They are a higher voltage in the L67 compared to the Ecotec.

Cam gear - The cam gear for the timing chain has a different orientation to the ecotec cam gear. I believe I worked it out to be about 2 degrees. This differetiation retards the cam gear 2 degrees.

Other than that, they are basicly the same. the blocks are the same, the crank is the same except for manual ecotrec cranks. They have an extra dowel hole in them or something.

The converters in the L67s have a 2600 factory stall and they also have heavy duty lock up clutches. Where as the ecotec converter is smaller and has an 1800 stall.

Other than that the L67 and ecotec boxes are basicly the same.

[M3ZZA]

Ok thanks heaps for that guys. i think i might just go with a full l67 just to do it all right the first time.

Just one more question is a l67 5 speed manual stronger then a normal 5 speed.

[DLFHUB666]

Ok thanks heaps for that guys. i think i might just go with a full l67 just to do it all right the first time.

Just one more question is a l67 5 speed manual stronger then a normal 5 speed.

The l67 as far as i know never came out in manual, auto only.

[wraith]

L67 was auto only

[MR_VX]

yeah there was never a L67 manual, well not that i know of.

[zapper-l67]

A good Auto in an L67 is up to a second faster over the quarter than a manual..