[Gmecm] Re: Gmecm Digest, Vol 15, Issue 8

[William Lucke]

Don't they have the ECM controlled secondaries? Are you just going to 
remove them?
I think that was the reason I didn't want the 00-03 throttles. The 
98-99's were also the biggest I heard about...


Will


> From: "Robin Handley" <Robin at FuryWorld.fsnet.co.uk>
> Subject: Re: [Gmecm] Understanding injection system acronyms
> 
> I'm currently looking for 2000-3 GSXR 750/1000 TBs ! :-)
> 
> Robin
> 
> ----- Original Message ----- 
> From: "William Lucke" <william.lucke at highspeedlink.net>
> To: <gmecm at diy-efi.org>
> Sent: 14 May 2006 00:32
> Subject: Re: [Gmecm] Understanding injection system acronyms
> 
> 
>> I have acquired two sets of 98-99 Suzuki GSXR 750 throttle bodies in 
>> order to go throttle per cylinder on my Cadillac Northstar. Sport bike 
>> throttles are very handy because they already include injector bosses 
>> and vacuum ports as well as a way to integrate them into a single 
>> actuation mechanism. The 98-99 GSXR 750's have the biggest per cylinder 
>> sport bike throttles (46mm). Suzuki GSXR 1300R (Hayabusa) throttles are 
>> much more common and are around 42mm. Beware that many of the most 
>> modern sport bikes use ECM controlled secondary throttles behind the 
>> rider controlled primary throttles to smooth the power delivery. You'll 
>> either need to chose a set without or remove the secondaries and plug 
>> the shaft holes if you buy a set with.
>>
>> Also check out: http://www.msefi.com/viewtopic.php?t=6627 for motorcycle 
>> throttle info.
>>
>> In extreme racing engines, particularly dragsters, it is possible to run 
>> both PFI and TBI at the same time... PFI supplies fuel at idle and low 
>> throttle and when the PFI injectors get maxed out, the larger TBI 
>> injectors start spraying. This allows the latent heat of vaporization of 
>> the fuel to cool the intake charge and supplants the need for 
>> intercooling in alcohol fueled forced induction cars.
>>
>>
>> Will