Darwantae951

Ok,

I have the autothority chips...is that what the jetted banjo is for? I'll be installing a tial 38mm wastegate here soon with an MBC. Should I take it out?

-Darwin

Cory9584

If you have an mbc you dont need the jetted banjo bolt, all it does is increase boost on an otherwise stock car

Mike1982

How much does it actually raise boost? Not that I ever had one or plan to go to one with my upgrades, just wondering.

SD Porsche Fan

Cory is right. The jetted banjo bolt is there to "trick" the KLR. You will be bypassing that with your MBC. Leaving the jetted one in place will potentially make controlling boost predictably more difficult.

adrial

Depends on the size of the jet...they are just carb jets so they come in many sizes. Typical is the ballpark of 15psi.

My car was making 18psi in 3rd and 20psi+ in 4th courtesy of the PO trying to make the car faster than his son's Eagle Talon...found that out after installing an aftermarket boost gauge of course.

Darwantae951

Ok, so if I just unscrew the jet will it be sufficient or do I need a new banjo bolt?

-Darwin

F18Rep

Everything you guys said is exactly right but just happens I've been playing with this and have a little different view. I have 2 87 951s. Both pretty healthy, one chipped, one stock. I only insure one at a time and have been driving the stock one. A little boring - so I swap the DME & KLR and move the autoauthority chip set to the stock car. The car didn't really change much -still boring. Last night I needed to run into town for some gas, so I quicklike swapped the banjo bolt onto the stock car (to go with the chips)- wow, that made a huge difference.

I know theres a lot more aggressive mods and newer (probably better) chips but that jetted banjo bolt was a pretty slick little idea. Bruce

400hp944

Very interesting. I have a heavily modified car with APE chips with the banjo jet in, and have a GReddy EBC. Works great.
Did I miss something here?

Darwantae951

Ok...so I leave the jet in then?

-Darwin

Keithr726

I wouldn't, lindsey sells them. Might as well get one and swap them out.

adrial

No -- just unscrew it.

F18REP didn't make any mention of a boost controller. So obviously installing a jetted banjo bolt will increase boost and make the car go fast.

Leaving it in will only delay the reaction time of the boost controller and possibly allow for boost spikes.

The jetted banjo bolt was just a means of increasing boost without installing a boost controller, but not a good one.

400hp944

OK...I don't get it. I understand the concept, but I experienced boost spikes with the jet out using my EBC. What's going on here? Does the year of the car make any difference? Ventury delete?

adrial

You probably need to play with the settings in your EBC.

F18Rep

Sorry Darwin, we're sorta getting beyond your question. If you're going to a boost control other than the oem cycling valve, then I think Adrial is right, the jet won't do anything for you. Modding the 951 is almost always a series of steps and I just like the ingenuity of the first step (Autoauthority chips/jetted banjo bolt). Bruce

PS...Here's a nice summary that someone here contributed a few weeks back...
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Basically, the path toward improved performance from a 951 starts in a well understood place...replacing the factory's clever (and state of the art at the time) Cycling Valve EBC/WG combo with either a mechanically controlled superior spec dual port WG or one driven by a more modern EBC controller. Of the many mods that work well on our cars, this single upgrade makes the most immediate difference because it directly changes the amount of boost available and how fast it is available.

There is a ripple effect though....and WG/Controller upgrades start a chain of other needed or desirable bolt-on/plug-in upgrades to the DME, AFM/MAF, FPR, injectors, downpipe and cat. These are also fairly standardized and well understood mods. Many 951 fans stop at this point as their cars are lightning fast, and if the mods are well matched, dependable...prone only to the occasional head gasket failure or #2 rod bearing seize-up.

"Hard" upgrades to turbo, intake and head are pricier and less well understood as to the gold stardard of hardware and spec, I think. It is quite possible to make enough HP here to risk very short engine life, short driveline life..and, in fact, very short passenger life, for that matter.

Darwantae951

Bruce, thanks for the little blurb. I'm not worried about you guys drifting off topic tho. My question was answered and I learn from everything everyone contributes. Thanks guys!

-Darwin