4-hole Bosch DRI fuel injectors from OsideTiger - Upgrade option?

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RescueU

RescueU

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I have been trying to locate a local shop that'll do fuel injector cleaning ( done off engine in a proper cleaning/testing rig....still no joy). One thing I noticed was that after having the injectors cleaned and tested, by most accounts there's usually the probability of having to replace one or more of them to achieve a balanced set for flow rate.

Given that potential outcome, I started looking around for replacement options, including OEM and performance tuning upgrades.

Option #1: I've read previous threads about LC owners with turbo rigs upgrading their fuel injectors to achieve higher flow rates with the Subaru WRX "blue" 400cc injectors. Here's an example...


http://www.ebay.com/itm/NEW-400cc-B...arts_Vehicles_CarParts_SM&hash=item5895b40920

Option #2: Osidetiger's 4-hole Bosch DRI (Deposit Resistant Injector) fuel injectors

140.jpg


http://www.ebay.com/itm/ws/eBayISAP...00971117252&item=200971117252&vectorid=229466

These have definitely sparked my interest! Here are the specs:


  • Brand Name: Genuine Bosch (DRI)
  • Fitments: Direct fit, No ECU/PCM modifications necessary
  • Applications: 1993-1997 Land Cruiser 1FZFE 4.5L 6cyl
  • Impedance: High Impedance
  • Connector type: EV1 (Plug & Play Adapter Connectors Included)
  • Warranty: 1 year/unlimited mile service warranty

type3tip.jpg


Here's a link to their video about the product, that shows the dispersion pattern of the 4-hole design.

http://www.youtube.com/watch?feature=player_embedded&v=9P4YtNVPtjM

I believe they're still flowing the same volume of fuel as the OEM/Denso spec (312cc/hr), so no adjustment is required like the WRX injectors need.

I'm looking for some feedback from the community to see if anyone's seen or looked into these before.

Thanks!
 
You can find bosch four hole injectors on lots of factory vehicles in the junk yard. I know the dodge neons had them, there is a whole list of others. Not sure how they would mate up with the fuel rail on a toyota. I have never messed with fuel injectors and do not know if they are all a standard size. In any case this has been a common mod for the Chrysler 4.0l for some time.
 
I dunno how probable it is that one injector will be weaker than the others. That may just indicate that it needs more of a rebuild.

This isn't something that seems to be a problem among people rebuilding really early bosch injection systems from 1979. of course, that's generally a fool's errand today as most of those engines performed better on carburetors. Just not as efficiently or cleanly.

I'm not saying it isn't a possible problem. $200 for the whole set of injectors + adapters for the wire harness looks like a steal, but, i'd have to have money burning a hole in my pocket to go there first.

Shouldn't be hard to find a local injector clean / rebuild service. I found one in salt lake city (certified injection service) with google in about 5 minutes. Dunno if they still charge $15 per like they did in 2009.
 
Those 4 hole Bosch injectors definitely peak my interest. I wish I would have known about them before I had mine serviced I could have been a guinea pig. I would have to see some positive results before I swapped them in. I'm a bit sceptical about these helping much with the 80's thirst for fuel!
 
scottryana said:
What makes this 4 hole design any better then the stock 4 hole design?
Click to expand...

?? Stock is 2 hole.

Whether they are better (versus just different) - no idea...

cheers,
george.
 
Just a couple of comments

It's important that when evaluating injector flow that they are rated at the same fuel pressure. With some research you'll find that the same injector will be rated with different flow ratings. This is do to the fuel rail pressure supplied.

For the most part flow ratings are with a fuel rail pressure of 3bar. At three bar our stock injectors are rated at 304 CC/min, the WRX blues, 3920 are rated at 425 cc/min.

Some sites are now offering flow ratings at various fuel pressures as some people will raise/lower the fuel pressure on the rail to deliver more/less fuel as a tuning choice.

The WRX 3920s have 12 holes which help with better atomization and with it's smaller solenoid mass will allow better control during the low duty cycles that idling requires from a larger flowing injector.

While these are a drop in electrically they aren't that way physically. They are around 9mm shorter than the stock injectors so the rail spacer needs to be shorter. I've found one that is shorter than the stock spacer from another Toyota but it still falls short of what we need to drop these in without a spacer of sorts added to the injector itself.

And the stock injector is a 2 hole design.
 
scottryana said:
My stock take outs were 4 hole.... hmmmm.
Click to expand...

Huh - they were definitely ORIGINAL??

I purchased our 80 new - and the stock Denso injectors are definitely 2 hole...

george.
 
landtank said:
While these are a drop in electrically they aren't that way physically. They are around 9mm shorter than the stock injectors so the rail spacer needs to be shorter.
Click to expand...

LandTank, by "these"...are you referring to the WRX blue injectors? Or Osidetiger's Bosch DRI injectors?
 
If you guys haven't done so, I'd recommend takin a moment to watch Osidetiger's video (at the bottom of my OP). It was illuminating in terms of understanding how variations in the injector's fuel stream can impact effective atomization.

I believe these Bosch DRI 4-hole injectors are able to deliver better performance results in atomizing the fuel at the same OEM rate of flow, rather that just throwing larger amounts into the chamber.

Frankly, for the potential they stand to offer at the this price point...I'm surprised these haven't made their way thru the LC ih8mud community more.

I'm thinking I'm gonna give 'em a go.
 
RescueU said:
LandTank, by "these"...are you referring to the WRX blue injectors? Or Osidetiger's Bosch DRI injectors?
Click to expand...

I'm referring to the WRX injectors. I have no info on the Bosch injectors and in all my research have ignored all injectors needing an EV1 adapter plug to work.
 
LT, I'm curious as to why did you stay away from injectors needing the EV1 harness adapters?

Any particular reason, or just due to a lack of access to an EV1-OEM harness adapter?
 
RescueU said:
LT, I'm curious as to why did you stay away from injectors needing the EV1 harness adapters?

Any particular reason, or just due to a lack of access to an EV1-OEM harness adapter?
Click to expand...

I like the connections Toyota uses and am not a fan of adding more connections to a wiring harness. Those addition connections always mean additional failure points.

I like the sock injectors for what they are and have been looking into an upgrade for FI trucks. Since WRX injectors are high impedance and have the same electrical plug getting them to physically fit our trucks opens the door for an incredible amount of choices in the aftermarket world as far a flow ratings goes. However those flow ratings are all well above our stock injectors from what I've seen.
 
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Assuming any of the aftermarket injectors discussed above atomize the fuel better than the original injectors, what benefit would be expected on an otherwise stock engine or a stock engine with a LT MAF? Better fuel economy, more power, or would these only benefit engines with turbos or superchargers??
 
better atomization may in theory allow you to advance the timing slightly.
 
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