OK Guys...

I'm comfortable tuning on a street port... but what's up with the bridgeports?

A friend of mine has a Pineapple bridgeport on all 4 intakes. I am trying to help him out on the tuning but it seems pretty stubborn to tune and doesn't always respond how I want it.

A few questions...

What should I expect it to idle at?
What will be the quality of the drivability in vaccum? Under 4000?
Any tips for how to tune a bridge differently than a street port? A few degrees less timing right? What about fuel? Tricks to make it idle? What should my wideband say and can I trust it with a lot of exhaust recirculation at vacuum?

Regards,
B

 

my half idles at 1500 so im pretty sure you want it to be in the area.

 

http://www.hitman.hm/ported.htm

If you don't have a good vacuum signal you may need to use TPS mapping.

 

TPS mapping on a haltech. what tricks needed? we got the engine to idle. but too lean makes cut off and rich just sputters badly.

 

TPS mapping on a haltech. what tricks needed? we got the engine to idle. but too lean makes cut off and rich just sputters badly.

 

TPS mapping on a haltech. what tricks needed? we got the engine to idle. but too lean makes cut off and rich just sputters badly.

 

TPS mapping on a haltech. what tricks needed? we got the engine to idle. but too lean makes cut off and rich just sputters badly.

 

TPS mapping on a haltech. what tricks needed? we got the engine to idle. but too lean makes cut off and rich just sputters badly.

 

TPS Mapping is possible but i believe the car he's talking about is a BP turbo. Again it's still possible to use TPS mapping but remember at 100% tps you'll have one value for your fuel map at various rpms and you'll have to tune it for your max boost setting.

I would try playing with your injector timing to see if you can improve idle and part throttle driveablitity.


What would be nice was if you had an ecu that either has adjustable rpm and load sites so no matter how much vacuum you got you can add sites to add resolution in certain areas that require more.

or an ecu that can be tuned with tps and map compensation. This way the ecu uses both tps and your map signal to tune your car.

 

The irratic idle of a full bridge WILL cause havoc with the MAP sensor , try using the zero throttle map for idle , my half bridge idles at 13.5 to 13.7 a/f ratio , as for after idle I will not advise tps mapping but the conventional MAP sensor mapping , the fuel requirement (for my car at least) increases in a non -linear fashion after 45000rpm when the bridges and the turbo really begin to work together, TPS mapping can never properly work there , thats more for a NA application.

 

Hopefully Steve Kan will chime in here. Either him or Judge Ito. I know they both have experience tuning bridges. Best of luck in this challenge.

Zach

 

dont forget about BDC

 

I should've remember him since he built my big bro's 13B-RE! It's a half bridge and is tuned perfectly. Good lookin' out Razorback.

Zach