i going to be building some itbs here in a bit was wondering which are a better setup i have a full built b20vtec and was wonder the differences between the 2?

i know that the honda itbs have a better mounting solution for the TPS vs. the gsxr 1000 thats my only doubts of why to get the gsxr itb's. but on the other hand i heard the gsxr is better in the long run like the velocity stack are a little bigger in diameter?

so i would appreceite it if anyone who has attempted or knows the best betweem the 2 and im welcoming opinions. If anyone has any links to some good pages i have expolored before i made this post so ya i would also b happy to see some links

thanks

 

needsome feedback please

 

have u done some searches? there are many many threads on DIY ITB's in a variety of forums here.

 

I am using the CBR 954 throttle bodies, I would go with the GSX-r 1000 though because you can space them apart instead of cutting and angling your runners a little to accomodate the CBR throttle bodies

 

it is important to size the throttle body to your application and horse power levels.
this is a good guide but IMHO those throttle plate size numbers are a little optimistic for the typical DIY itb set up because they are usualy not optimized.

http://www.jenvey.co.uk/
in their FAQ there is sizing suggestions.


m.

 

The best option for the size of your motor (if you want to stick with DIY ITB's) are the Suzuki Hayabusa units. They measure 46mm at the plate and 49mm at the opening. Most V-Twin motorcycles use TB's in the low 50's, like the 900-1000cc Ducati's and Honda RC51. The Aprilia 1000R measures 57mm at the plate, and is the largest I've seen. The only problem with sourcing TB's from a V-Twin bike is that you need two sets, as V-Twins only have two cylinders.

The TPS issue is not a concern if you run Crome. Crome allows you to enter in the TPS voltage range, and scales the maps accordingly.

Some pictures of my 'busa ITB's.

 

wouldnt the busa tb's be to big for my motor app. since there from a 1300 cc bike?
thanks for the help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">wouldnt the busa tb's be to big for my motor app. since there from a 1300 cc bike?
thanks for the help.</TD></TR></TABLE>

Your motor is almost 2000cc.

 

true lol so i should get busa tb's ? how the tps deal on them easy to mount? other than that anyother difuculties for teh busa setup?

other diy itb projects completed r welcome just let me know how u did it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">

Your motor is almost 2000cc.</TD></TR></TABLE>

his motor also doesnt spin 14000rpm+
the busa itbs which i also own a set of will flow a lot of air

 

o hell yes i can hit 14kkk lol jk so u think that the way to go is the busa tb's over those 2? is the fabracating harder with the busa tb's

 

I would say the Busa ITBS are more correctly sized. TWM makes their b-series ITBS in 50mm, and i believe they used offer 48mm. I would go for something in that vicinity.

 

thanks but does anyone know a good way to mount the tps pics are welcome

 

need opinions still

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">thanks but does anyone know a good way to mount the tps pics are welcome </TD></TR></TABLE>

Use the stock GSX-R TPS. Scale the voltage range in Crome. Problem solved.

For a plug, you can get a female connector for the TPS from a Suzuki dealership and create your own TPS plug.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">

Use the stock GSX-R TPS. Scale the voltage range in Crome. Problem solved.

For a plug, you can get a female connector for the TPS from a Suzuki dealership and create your own TPS plug.</TD></TR></TABLE>

or cut off where the tps goes on a oem tb and weld it to the busa itbs

 

nice does anyone have pics of that

 

anymore solutions or pics of the tps mounting?

 

is it better to cut runners off of a manifold just enough so u cant mount a fuel rail and weld straight runners or do that and use the tb's to put the injectors instead of the manifold mounting place witha honda fuel rail?

 

It is your choice.

The problem is, you want the runners to be straight. Doing so means spacing the ITB's to match straight runners. Doing so eliminats the possibility of using the ITB fuel rail because the spacing is different. You can always get a custom rail made.

Since you are dealing with slightly smaller than optimal throttle bodies, you want the runners to be as straight as possible. The shorter the runner length, the higher the peak RPM will occur, and vise versa.

As for the TPS, the easiest solution (and cleanest looking IMO) is using the 'busa TPS.

 

subscribed so i can look back on this thread when i get to doing my tps sensor

 

keep um coming

 

bump

 

bump

 

what else are you wanting to know?