1999 Bonneville SLE with L26 manifold

L26 UIM swapped onto an L36.

A friend and I spent some quality engine modding time. We swapped out the lower intake manifold for a ported and polished one, and the upper intake manifold is now the aluminum version from the Series 3 3800. There is a custom throttle body adapter plate with a Series 2 supercharged 3800 throttle body. Rice pipe to conical K&N air filter make up the rest of the air intake. Everything else is stock.

Category:

Autos & Vehicles

Tags:

• Bonneville
• L26
• L36
• upper intake
• lower intake
• manifold
• L67
• throttle body
• exhaust
• idle
• coolant
• Dex*

[pontiacgmx]

hey, how is the ported lower intake manifold treating you? did you just change the oil after you installed it, or did you have to do any other post mod things to get it running? i just want to know because im going to install mine soon

[custommadename]

The ported LIM is great! It's hopefully staying really clean too because it doesn't have that rough stock casting to hold carbon deposits. I did change the oil, though you don't need to if you're sure absolutely no coolant dripped into the lifter area. I recommend you change your oil just to be sure.

[eeevvviiil]

big jump in power?

[custommadename]

Yes, but only after a PRJ Performance tune. The L67 throttle body and 97 MAF sensor are not compatible with the 99 L36 stock MAF tables. It felt pretty good before and after the tune, though.

You know how Lucas power steering fluid is really thick? I tried making it more viscous by leaving it on the UIM for a while. However, the UIM cools so fast that it only made the bottle lukewarm. In comparison, the L36 UIM heated up bottles very nicely and apparently kept heat in as well.

[Blazen8gsx]

I agree with the last commentabout the egr valve. It's caused from sress of changing temperatures in the engine coolent the same thing happend to my sunfire's water neck it is also plastic but, plastic intake manifolds have there benefits to such as lower temps since plastics don't adsorbe heat as fast as metals do it also benefits from lower noise levels so that means more hp and a smoother ride.

[custommadename]

A polished UIM is so much more sexy than noise reduction and some more HP. I like to think of it as the plastic UIM suppressing heat that would otherwise be taken care of by metal. If you put your hand on a metal intake manifold and feel heat, it should be that you're sensing the heat that's dissipating. I could be wrong on that. What you just wrote makes more sense.

[custommadename]

No, I wasn't referring to you. You're actually still right. If I hadn't thrown away the UIM, I'd be able to take pictures of the EGR area.  It still was holding up, but it didn't look like the rest of the UIM's plastic.

[Blazen8gsx]

are you perfering to me when you said "The person who said the EGR causes rotting actually owns no Series II engine" I've own 2 series 2's the first one was from a 1996 bonneville sse (L36), the second was from a 2000 grand prix gtp sedan (L67).

[custommadename]

Ok, so that's why you think rotting is the issue. Actually, the EGR causes the thing to crack, not to rot. Junkyards and PRJ Performance conclude this. The person who said the EGR causes rotting actually owns no Series II engine and depends on older information. Quite a lot of BC people think the EGR is the issue, but then why do lower intake manifolds go to crap when there is no EGR going through those?

[Blazen8gsx]

no shit no one can laugh that loud.

I use to go to bonneville club a use to have a 96 sse but unfortunately I parked my car on the edge of the side walk and some drunk bitch ran in to it with a 2006 ford expedition that really sucked now I have a 2000 sunfire gt I have some unique plans for it im going to put a northstar v8 with a rwd platform.