Are Sieman-Deka Fuel Injectors sold @ Victory Perf. better than RC Engineerings?

[DSM_MIKEY]

Hello, I'm ready to upgrade to 550 or 660 injectors and I noticed the Sieman Deka 580cc injectors at this address:

http://www.victoryperformance.com/product/Detail.cfm?ProductID=1457

I'm wondering how these compare w/ the RC 550's. They are $50 more, but they do have 30cc more and they are a different design. Bottom line-Are they worth the extra$$?
Thankyou!!-MIKE

 

[DSM_MIKEY]

Anyone?

 

[AWDGSXownsU]

john shepard runs the same style injectors but larger of course. just think about that.

Manny
92 GSX

 

[ProStreetOnline]

You want a good injector like a Denso, that's pintle. Stay away from RC Engineering.

 

[DSM_MIKEY]

Thankyou! Does anyone have any actual experiance w/ these injectors. From what I understand, the design they use is superior to a pintle style injector. ALSO, would the extra 30cc per injector really help out? (580's vs. 550's)? Thanks again! -MIKE

 

[draculia]

i'll be running 650 ball/disk injector clinic injectors from www.diamondstarmotorsport.com

short answer, yes ball/disk injectors are better than pintle style injectors.

 

[DSM_MIKEY]

Hey Draculia, just so you know, you can get 680's at the link I listed at the top of the post for $10 more than 650's. They are both the same injectors! They are Sieman-Deka's! Just trying to help you out. Maybe you can order the 650's you want for cheaper than $400. Good Luck! -MIKE

 

[HondaEatingTSi]

I have the 660's sieman deka's. In my own opinion I love them. Havent had any problems with them leaking or anything of that sort. I would say get them, or you can get any other kind as long as they are ball/disc

 

[DSM_MIKEY]

What's so much better w/ ball/disc design? What problems do people have w/ RC's? Are 580's big enough or should I go for 660's for flexibility in tuning. I have a t28 w/ supra sidemount, 3" turbo back exhaust. I may go to a L1R, however in the future. Thakyou! -MIKE

 

[98TsiAWD]

Originally posted by DSM_MIKEY
What's so much better w/ ball/disc design? What problems do people have w/ RC's? Are 580's big enough or should I go for 660's for flexibility in tuning. I have a t28 w/ supra sidemount, 3" turbo back exhaust. I may go to a L1R, however in the future. Thakyou! -MIKE

If you are going to a L1R possibly in the future, get the 660 or 680's.

 

[KenTSIII]

Those injectors are advertised at different base pressures to give different readings. IE.. all Delphi (SeimenDeka) injectors that are rated 650, 660,680, ect... are all actually the same size. We had a goup buy on these that expires the end of Feb.. but the 650/680s are on backorder till at least march. And yes the spray pattern w/ these is superior to the pintle style. If you want to see the difference.. take a spray bottle & spray it on mist... & then spray it on stream... and you'll see the difference. I'd say to do it w/ gasoline/alcohol in the bottle.. but I'm afraid someone would get hurt.

 

[draculia]

yeah, i could see the beginning of zoolander all over again.

 

[dsmracingofco]

I found a group buy on these sieman deka injectors 660's, pretty cheap actually. I want to know if there is a difference between 55lb or 75lb injectors?
I will be running either a big T28, big 16G, and even hopefully a L2R.
Thanks for the advice guys.
Chad
97 GSX "under construction"

 

[DSM_MIKEY]

Where was the GB at? Is it still available? Thanks-MIKE

 

[whitegst97]

ok cool i found this topic doing some research, i was about to buy a set of ijectors in DSM trader, it seems to be from a company since they have 90 day warranty, but i hadn't heard of the name delphi before, are they any good, they are ball/disk 660cc's and they are running for 350, does this sound good, and with these they told me it came with the 0 rings that would make it a perfect fit into the block, therefore i really don't have to buy the lower insulators that usually break when they're taken off. Any comments would help alot, thanks in advance.

Yomny M.

 

[irn__man]

What style are the Sieman Deka injectors?

Are they Pintle Tip or Disc/Ball Style Tip?

 

[dsmracingofco]

Sieman Deka's are pintle style, which are inferior to ball/disc. The spray like a stream as opposed to a spray, like a normal house cleaning bottle (stream or spray).

 

[DSM_MIKEY]

The Sieman-Deka's are ball- disk style NOT the pintle style. Click on the link that is on the top of my original post. -MIKE

 

[irn__man]

Originally posted by DSM_MIKEY
The Sieman-Deka's are ball- disk style NOT the pintle style. Click on the link that is on the top of my original post. -MIKE

Then you can get them for $20 cheaper here:

http://www.fuelinjectorclinic.com/product_cart.htm

iron

 

[ecstasytsi]

Disc style injectors have the best atomization characteristics as appose to pintle style which has a spray pattern that is far more narrow. If you notice on rc engineering's website, all their injectors up to 550cc are disk style. Anything larger then 550 rc uses pintle style injectors as they are better in high performance and especially turbocharged applications. Here is a quote from Ross Collins, owner and founder of RC Engineering "A wide, finely atomized pattern is wonderful for emissions and economy but can cause problems in higher performance engines. At low RPMs, with a low air flow rate, the slow moving finely atomized fuel has enough time to get past the valve and create a close to stoichiometric mixture. (Air/Fuel mixture of 14.70 - Chemically ideal) As RPMs increase this mass can't keep up, with valve open time, and many of the fuel droplets impinge the port wall and condense. Atomized fuel can only travel at port "air speed" and in large quantities it can actually displace air in the port. With a highly atomized mix in the port, at intake valve opening, the lighter droplets of fuel will be partly blown back up the port. This is caused by the residual exhaust pressure still resident in the combustion chamber. Some of this reverted mixture will adhere to port walls and condense. This puddling fuel may find its way home, on the next intake cycle, but it will cause cycle-to-cycle air/fuel ratio variances. The higher inertia of the more condensed fuel will carry it to its target. The rest of the article can be found here http://www.supras.com/~riemer/sonictech/fuel_injectors/RCtech.html

 

[irn__man]

What would be the Negative Effects of turning up the Base Fuel Pressure on 550cc injectors? Instead of running at 43psi base fuel pressure, turn it up to 50 psi. If you have fuel control (S-AFC), would their be any possible problems? Could this be an option before upgrading to 660cc injectors?

iron

 

[MaineDSM]

The ones sold at www.fuelinjectorclinic.com are modified *Bosch* injectors, as far as I know. I just got a set of 850s, and they idle like stock with DSMLink. A little pricey, but you get what you pay for. I've heard of nothing but trouble with the Denso 720 (pintle) injectors. FWIW.

 

[MaineDSM]

Originally posted by irn__man
What would be the Negative Effects of turning up the Base Fuel Pressure on 550cc injectors? Instead of running at 43psi base fuel pressure, turn it up to 50 psi. If you have fuel control (S-AFC), would their be any possible problems? Could this be an option before upgrading to 660cc injectors?

iron

Sure it's an option. That's how people run great numbers on small injectors. However, you might kill your idle & cruise gas milage, and/or make your fuel tuning more complicated than it would be with the right size injectors at stock base fuel pressure.
It won't hurt to try. If you don't like the hassles, get the bigger injectors.