Rochester 650's injectors

[Staytuned]

Anybody know anything about these injectors?...good, bad, stay away from. Are they ball and disk or are they pintle style? Would you use them on your car?

 

[doug]

From what I've read, those and the FIC, Delphi, and PTE injectors are all the same. They should be ball/disk. I have the "PTE/Delphi" ones and they look just like FIC ones-- olive and black, with the same kind of serial numbers stamped on them.

 

[eclipse90gsxt]

Do you have a link to them?

 

[Staytuned]

No these are a private buy from a DSM board in Canada. I have been asssured by the seller that these are good injectors bought from a reputable dealer here in Canada called Kinetic Motorsports. The only downfall is that they do not have flow charts with them ....so I can only count on them to flow what they are sold as. These should do me for next summer until I get DSMlink.

 

[awddsm95]

From what i can infer, Rochester, the company you are speaking of is the same Rochester that made the old carbuerators for every car known to man in the 60's and 70's. I still have the origional Rochester carb off of my 71 Nova, they are a ligitimate company and i can assure you that there products are top quality. Just my .02 cents

 

[bastarddsm]

oh ya the good ole Quadrascrap, cant forget the infamous duojet!

 

[steve]

From the itty bitty picture they provide they sure look like the Delphi/Rochester injectors that FIC and PTE sell. http://www.kineticmotorsport.com/catalog/index.php?cPath=134_117
From Delphi/Rochester the injectors need machining for use in a DSM.

Steve

 

[ken inn]

fwiw, i just got some fic 650's, and i have issues with them. they seem inconsistent, i have to change my afc settings quite a bit, and after finally logging them, duty cycles seem to be worse than my old evo 6 560's. at 18 lbs boost, i am getting hella knock, and duty cycles way over 90%, about 6800 rpm. with the evo's, i was getting 86% at 7100, no knock, and fuel trims were way more consistent. if i had to guess, i would say these 650's are really 450's. i bought them brand new from fic. i want my denso's back.

 

[pneumo]

fwiw, i just got some fic 650's, and i have issues with them. they seem inconsistent, i have to change my afc settings quite a bit, and after finally logging them, duty cycles seem to be worse than my old evo 6 560's. at 18 lbs boost, i am getting hella knock, and duty cycles way over 90%, about 6800 rpm. with the evo's, i was getting 86% at 7100, no knock, and fuel trims were way more consistent. if i had to guess, i would say these 650's are really 450's. i bought them brand new from fic. i want my denso's back.

Yes, the new EVO8 injectors are really nice. Part of the reason you're having issues might be due to the rise/fall time of the injectors. Typically as the injector gets bigger, it's deadtime gets longer, leading to fuel trim problems and duty cycle inconsistencies. The longer deadtime will add a little to the duty cycle, probably 1% to 2%. That's why it's so nice that DSMLink and Keydiver chips provide for deadtime compensation.

For comparison, stock DSM 450's have 1.5ms deadtime, RC 550's = 1.8ms, Denso 660's are also 1.8ms, FIC injectors are around 3.15 to 3.30ms. Denso 720 = 4.5ms So typically bigger injectors are harder to tune. EVO8 injectors have LESS deadtime that stock DSM450's, tho I can't find it in my notes right now.

 

[DSMJim]

Anybody know anything about these injectors?...good, bad, stay away from. Are they ball and disk or are they pintle style? Would you use them on your car?

Chances are they buy from fuel injector clinic. Rochester style injectors are very popular and many major DSM retailers use them (along with myself). They don't need to come with a flow chart they work just fine. Check around because they may not be the best price from kenetic...

www.fuelinjectorclinic.com

 

[steve]

EVO8 injectors have LESS deadtime that stock DSM450's, tho I can't find it in my notes right now.

I'm running 48uS less than the stock 450's. Thats what it took to keep my low trims from dropping at idle. You don't need your notes, I know where the data came from

Steve

 

[Staytuned]

Chances are they buy from fuel injector clinic. Rochester style injectors are very popular and many major DSM retailers use them (along with myself). They don't need to come with a flow chart they work just fine. Check around because they may not be the best price from kenetic...

www.fuelinjectorclinic.com

Jim I am buying off of the Canadian DSM board. But they originally came from Kinetic about 2000 kms ago.

 

[DSMJim]

Jim I am buying off of the Canadian DSM board. But they originally came from Kinetic about 2000 kms ago.

Then they are FIC injectors and no problems. THe only thing about used injectors is that if they have has around for quite some time they could be clogged up.

 

[Staytuned]

Sweet thanks Jim.