How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Quan-Time · Post by **Quan-Time** » Mon Dec 03, 2007 3:16 am

its quite common to get the head flowing nicely by cleaning the radius / slight reshape, THEN to get little bits of putty, about the size of a match head, and start filling it back up where it WONT effect CFM. All you are doing is basically removing a spot where "dead air" can gather. Its surprising how much you can fill a port up.

Its a long process, and as you said hansj, a flowbench is only a "tool" like a spanner or a screw driver.. It only has one job, to test raw CFM. you CANT test velocity or swirl or resonance as you said. But its a good starting point.

TonyDevil · Post by **TonyDevil** » Thu Dec 06, 2007 3:49 pm

Quan, i've copied the first post to the XTZ site to help a couple of people out who are looking at doing the same mod
http://supertenere.proboards20.com/inde ... 790&page=1
i've also linked here and credit is obviously left with you.
sorry i should have asked first, if its a problem please let me know and i'll remove it.

Tony.

Quan-Time · Post by **Quan-Time** » Sun Dec 09, 2007 11:37 am

make note for the future:

i have NO PROBLEM with anyone reproducing the work i have done, nor do i have a problem with ppl posting information on other forums / places of interest. I think its good to share knowledge and experiences (and possibly failures)

Think of me as a "open source" sorta guy.

Quan-Time · Post by **Quan-Time** » Fri Feb 01, 2008 2:28 pm

41.2mm on the money. 2.5deg lead in taper (about the top 25mm / 1inch) and i stopped short on the bore so i can port it out cleanly on the flow bench to get max velocity / cfm. Obviously it will flow very close to the stock 38mm because of the restriction there, but soon as i start porting it out, it will pick up fairly fast.

Should have some more info / pics in a week or so once i clean it up.. Ill do a final test with the butterflys in there.. Obviously new ones were made, CNC does wonders.

anyway. see how i go.. Still many more things to do.. Takes ages.

wicky · Post by **wicky** » Tue Feb 26, 2008 2:14 pm

whas the hold up Quan, any news ferrous ?????

coxylaad · Post by **coxylaad** » Thu Oct 20, 2011 11:39 pm

any progress on this Quan?

I am very interested seeing I will be running the 900 motor with those very same throttle bodies.

I have a spare set too to work on

heanoid · Post by **heanoid** » Mon Oct 24, 2011 12:38 am

got to ask this ...will it be more powerfull than a half decent trx ( i.e. about 80 bhp) and will it be faster...if not then why ?
not trying to be funny or owt but its all way above me and id like to know what motivates you to do this kinda stuff

Post by **Mincehead** » Mon Oct 24, 2011 7:19 am

Simply because he CAN. Quantime loves to modify and he`s very proficient at it too, it`s not all motor tuning either, search his posts.

coxylaad · Post by **coxylaad** » Wed Oct 26, 2011 8:37 pm

I am all for using standard upgraded parts where ever possible, and lo and behold fuel injected R1's from 2003 have 41mm throttle bodies!

I wonder if it is possible to just split a set in half and get a set or even 2 sets of TDM 41mm TBs out of them? saves the specialist machinery to bore the TDM TBs out if it could be made to work

Post by **Mincehead** » Wed Oct 26, 2011 9:03 pm

Hmmm interesting, yes it might well be possible. Although, that said the butterfly spindles could require modification (not sure if there are spindles for the correct length / spacing), but it`s surely not beyond the scope of someone confident in their engineering abilities.

Are there any twins out there with 41 mm throttle bodies paired at a similar distance to a TRX I wonder?

coxylaad · Post by **coxylaad** » Wed Oct 26, 2011 9:37 pm

2002-2003 R1 throttle bodies are 40mm as far as I have read.

check these out: http://www.ebay.co.uk/itm/02-03-YAMAHA- ... 582wt_1163

they look like they might work. I will check the spacings on my fazer thou to get a rough estimate of spacing. You could get a set of those for 60 quid, a bit of modification it could be a cheap EFI option.

alextrx850 · Post by **alextrx850** » Thu Oct 27, 2011 4:35 am

Well that would be the basics, how about a fuel pump, the in tank version obviously runs quieter being immersed..but be a shame to cut into the tank and also reduce the fuel volume somewhat..heard some of the aftermarket car pumps..? damn noisey..!

Post by **Mincehead** » Thu Oct 27, 2011 12:21 pm

There are plenty of aftermarket fuel pumps available on Ebay, most run ceramic bearings and are VERY quiet, and I might add fairly cheap too.

An example after a quick search:

http://www.ebay.co.uk/itm/255-LPH-High- ... 56468369d6

Many motor factors will stock fuel pumps too, I could possible buy them cheaper locally if I shopped around.

coxylaad · Post by **coxylaad** » Thu Oct 27, 2011 12:43 pm

Well I have the fuel pump and level sender unit from a TDM900 so I am going to use that.

Need to find a way of grafting it into the bottom of the fuel tank.

Killerwhale · Post by **Killerwhale** » Thu Oct 27, 2011 4:43 pm

coxylaad wrote:Well I have the fuel pump and level sender unit from a TDM900 so I am going to use that.

Need to find a way of grafting it into the bottom of the fuel tank.

A German has it in a thread over at their forum...with pics how he done the 900 pump into TRX tank.

Yamaha TRX850 Enthusiasts Forum

How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)

Re: How To Guide: TDM900 EFI onto a TRX (warning, many pics)