Upgrading Bender stage 2 GT2554r to GT2560r front mounted

[TT]

I would installed the tubes (slides signal) like on the MCX intercooler. This will give you the best and most even air flow into both the tubes.

Just install the IC on the sled and mark were to install them and make a template for the angel to clear carbs/fit the OEM hoses on carbs.

It will be worth the extra effort - I think you will get an uneven pressure signal installed like this.

Just my 2 cent

 

[Jabakanada]

I would installed the tubes (slides signal) like on the MCX intercooler. This will give you the best and most even air flow into both the tubes.

Just install the IC on the sled and mark were to install them and make a template for the angel to clear carbs/fit the OEM hoses on carbs.

It will be worth the extra effort - I think you will get an uneven pressure signal installed like this.

Just my 2 cent

You are right. It will be worth of effort. I will go tomorrow to the garage and fit IC on its place + mark pipes ---> to the welder.

 

[BigDog05]

I put mine on top of the intercooler.

 

[Jabakanada]

It came from welder... look at those slide pressurising hoses.





I put 17,5 pilots to replace old 20`s and lowered needles back to center stock position. 1500 - 6000 RPM perfect. When it goes on boost then going rich and won´t rev. I think she does it becouse of those 155 mains. I have now 135´s and I will go to the garage put them in carbs. I tried 300, 400 and 500 on pitot and it wen´t better when going bigger. I don´t have any bigger to try on and local shops has only 500´s on their storage.

But I think that 135 mains will solve that problem....and now that jetting makes sense! those 155 were something strange....

 

[BigDog05]

At sea level and 135 mains, the 300-400-500- jets in the pitot should get you where you need to be.

I'm still around 600 in the pitot with 132.5 jets, but thats getting close to 3000ft elevation.

A 600 main jet is around a #45 drill bit, 2.0828mm or .082" , if you are still rich at WOT.

If you have any extra jets, just drill one out. It seems that every 100 size change in jet size is close to .5 on the A/F gauge.

Looking good

 

[Jabakanada]

At sea level and 135 mains, the 300-400-500- jets in the pitot should get you where you need to be.

I'm still around 600 in the pitot with 132.5 jets, but thats getting close to 3000ft elevation.

A 600 main jet is around a #45 drill bit, 2.0828mm or .082" , if you are still rich at WOT.

If you have any extra jets, just drill one out. It seems that every 100 size change in jet size is close to .5 on the A/F gauge.

Looking good

Thanks for info. I will drill one hex-jet with 2mm bit. My BMW left me on the road so no jetting tonight...

 

[TT]

Nice buddy - intercooler looks perfect! If your pitot is working 135 mains should get you close. Remember to turn out the pilot screws to 2 to 2,5 turns from seated position when you have the carbs off

 

[Jabakanada]

Nice buddy - intercooler looks perfect! If your pitot is working 135 mains should get you close. Remember to turn out the pilot screws to 2 to 2,5 turns from seated position when you have the carbs off

Thanks Tarjei, that IC would not be like that without your and TY help.... Now those pilot screws are 1,5 turns out from seated position. I will turn them little over 2 turns total when I´ll take carbs to the table for swapping mains.

 

[TT]

Nice buddy - intercooler looks perfect! If your pitot is working 135 mains should get you close. Remember to turn out the pilot screws to 2 to 2,5 turns from seated position when you have the carbs off

Thanks Tarjei, that IC would not be like that without your and TY help.... Now those pilot screws are 1,5 turns out from seated position. I will turn them little over 2 turns total when I´ll take carbs to the table for swapping mains.

Do your pitot work - does the AFR change when changing pitot jet? If so install the 135 main jets and 400-600 pitot jet pitot.

If it isn't working good when changing pitot jets just plug it off and intall 127,5-130 main jets. That should put you close to perfect at your alltitude

Boost on - Ride safe buddy

 

[TT]

Nice buddy - intercooler looks perfect! If your pitot is working 135 mains should get you close. Remember to turn out the pilot screws to 2 to 2,5 turns from seated position when you have the carbs off

Thanks Tarjei, that IC would not be like that without your and TY help.... Now those pilot screws are 1,5 turns out from seated position. I will turn them little over 2 turns total when I´ll take carbs to the table for swapping mains.

Do your pitot work - does the AFR change when changing pitot jet? If so install the 135 main jets and 400-600 pitot jet pitot.

If it isn't working good when changing pitot jets just plug it off and intall 127,5-130 main jets. That should put you close to perfect at your alltitude

Boost on - Ride safe buddy

 

[Jabakanada]

Yes that pitot-jet did affect to on-boost AFR´s. I thought also that I will put those 135 mains and 400 to pitot....then start to fine tune WOT AFR´s with pitot-jet if needed.

 

[Jabakanada]

I changed 155 main jets to 135 today and turned pilot-screws 2,25 turns out from seated position. First tried to run with 400 jet on pitot. Sled was running rich on boost. Tried many many jets to pitot and 750 was fine but lean on mid range. 600 was ok, no lean mid range (WITH BENDER KIT) but when pushing WOT from stand still sled will burble little. I raised needles 1 pos from center stock so that mid will be ok. Changing needle height didn´t affect on that burble sled has when pushing wot from stand still. Now sled runs better than ever, but still has something to tune. Any ideas? Maybe smaller mains?




End of the day AFR´s on garage yard pulls:

idle: 13,5 - 14
light throttle: 12 - 13
half throttle: 13 - 14
WOT: about 11


I´m going tomorrow "hillclimbing" and boondocking and will find out true AFR´s.

 

[Jabakanada]

It´s alive...


http://www.youtube.com/watch?v=wS-ggqL3vH0&feature=player_embedded


You can hear that burble when hitting WOT from stand still. WOT AFR´s was 10, all other RPM-area AFR´s were fine. Now there is that 600 jet on pitot-tube and needles raised 1 pos from center = 1 pos richer than stock. pilot-screws are 2,25 turns open. pilots = stock, mains = stock.

 

[BigDog05]

Try the needles back at stock level. The one notch rich is probably giving you the hole shot burble. That and the 2.25 turns off of seat.

What rxrider recommened for me was to go smaller on the main jets, then you can run a 300-500 in the pitot and that richens up the midrange. A smaller pitot jet will give you more fuel bowel pressure even under part throttle.

The 750 is too big. Try 132.5's, that should get you back to about a 500-600 in the pitot.

I just went to 130 main jets this morning and it should get me down to around a 500 pitot at WOT. Hope to try tomorrow.

I would try 132.5's and get the pitot dialed for WOT, then you can easy drop the needles if the hole shot still burbles.

 

[Jabakanada]

Thinking those 132,5 mains, but first I´m gonna ride some becouse I have spent so many hours in dark garage....

when I put bigger and bigger jet to pitot then mid area goes lean. Maybe those 132,5 mains will clear that burbling and will get WOT AFR up from 10.