TRD/ Magnuson 4.0 Supercharger Tips, Tricks, and Mods

0 quick question guys, just did a little off-road trip and my boost gauge is reading that it's maxing out half as much as it's supposed to. I can usually Max it out at 6 almost 7 and now it's maxing out at 3 what would cause that?

 

I've had erratic readings with a leaking boost reference hose or an intake leak.

If it's somewhat steady and not bouncing much then possibly something to do with the bypass valve.

Possible things to look at. Some of the wizards on here may have more specific ideas.

 

Thanks. I'm still driving home and vacuum works as it should. It's just the boost just doesn't show as high of numbers as it was before. Maybe my boost reference hose came loose or something

 

My afr readings were really erratic when the reference hose was cracked. Not sure how the boost readings would be affected as I didn't have a boost gauge at the time.

 

Does the truck feel like 3psi? Or does it feel like 6-7psi but it only reads 3psi on the gauge?

 

check your air filter. if alot of dust, it can choke your boost down a good bit

 

thank you to everyone jumping in. as of right now its back to normal. i don't know what happened my best guess is elevation? i didn't know that my boost could get halved by driving up about 6k elevation gain up in the mountains?

 

oh yeah, that will do it.

 

yeah i didnt think about it really being that much of a factor. maybe next time ill use a octane booster to compensate. 6k feet is good amnount im understanding

 

Octane booster will be a waste. Less air at elevation needs less fuel. If you lived up at 6k, and went down, you’d be making more boost and then, maybe depending on tune and other factors, you could use octane boost.

Those of us living at 5 to 6000 feet of elevation usually just run a smaller pulley to get similar boost to those of you at sea level. No other changes are usually necessary.

 

Finally last night I try to pull WOT on my truck, right now I use urd 2.8 pully, intake manifold spacer, urd cam gear, 76mm TB with standard Toyota TRD S/C tune. The weird thing is when I pull WOT on my boost show me 4.5lb of boost and suddenly drop to 1lb of boost and lose power like when you put on dyno and reach the limit rev but why my boost suddenly drop really bad. I pull a few time but same result, is it because standard trd tuning has that limit...
After that happen the truck run normal but should I get like 7 or 8lb boost with that pully.. so what the problem with my case, I was suspect with bypass valve leak the boost or something. Thank you guys

 

You may be the only one or only one I heard of running the intake manifold spacer. Did you change the belt when you added that? We discussed the pages ago and more headache then benefit with the extra height etc. First thought ify ou just added the S/C and had that thing on before. You could be getting some slip or its not fitting well. Remove that thing and try again.

 

Did you upgrade your fuel pump? Mine will cut out off the rev limiter sometimes on full wot uphill when it's not getting enough fuel.

 

I waited couple of years on the fuel pump. I had a couple things at WOT but you had to be going 80+ and maxed out. I don't recall ever having no boost or what he is seeing.

 

Justin @ Overland Tailor Tuning (not tagging him as he’d just repeat himself yet again and we don’t need to waste his time) has done some dyno testing with this and while it adds some power for non-supercharged engines, it doesn’t really do anything for us. So you’re better off removing it, selling for some cash and reducing the extra stuff (and tweaked belt length) from your setup.

 

I do change the belt, right now with urd 2.8 pully I use 720k5 belt and I don't have problems with the height my hood close just fine almost no headache beside figure out what size you need to use. I do feel benefit with this spacer especially mid range even with s/c.

I didn't change my fuel pump yet but I do have fuel gauge on it unfortunately I wasn't look when I do WOT and I was planning too but some ppl said not necessary if you not try to get over 400hp. correct me if I'm wrong

I'm not try to against Justin call or you but I think what happen with my case is not because the spacer. I feel the benefit on mid range plus make run little bit lean as suppose to w/o spacer.
I was thinking about bypass valve or intercooler seal leak or definitely need to tune with OTT

 

Not much to port but let's gooo. In the future I might offer a core exchange lower manifold if someone wants to purchase a port matched (not necessarily gasket matched but widened and port smoothed)

 

fuel pumps beyond stock levels are needed with boosting.

 

Check out this 2005 SAS with URD throttle body spacer and NOS!!!! Too bad he split his 89 Ford front axle… "stock long block, magnuson supercharger, piggyback ECU, custom intake…I think the motor has 400hp with the supercharger plus the 100 shot of NOS"

It looks like a hole was drilled into the supercharger inlet after the TB where the NOS is sprayed.

Ugh, and I got to 6:33... BullyDog tuner.

https://www.youtube.com/watch?v=jRYxi9e8ys4

 

So what you recommended for fuel pump upgrade?