Using DSM or EVO injectors in the SHO

[Shamwow]

Hello,

I am working on upgrading my SHO's fuel system in preparation of my turbo install

After removing the stock injectors, I compared them to some EVO 550cc injectors I had laying around. These are 52.4lb/in for all you SAE guys. I should also note they are essentially the same as the popular DSM 450cc injectors (easy to find in the yards).

SHO on top, EVO on bottom:



Here are a few dimensions:
Injector top boss: 11mm SHO and EVO (same)
Injector bottom boss (pintle cap diameter): 9mm on SHO and EVO (same).
Total length: SHO is 80mm tip to tip. EVO is about 72mm tip to tip.
Length seal to seal: 60mm SHO and EVO (same)
Connector: same
Impedance: SHO is high impedance, EVO is low impedance. A resistor box can be utilized.
Tip Pattern: SHO has two nozzles, while EVO has 4 nozzles.

So these EVO injectors "drop in" between the stock rail and head. No boring or messing about. Pretty simple install, just wire in a resistor box (Honda accord v6 for example).

The main difference is in the length between the pintle cap tip and the lower boss seal. As you can see the SHO injector would extend deeper into intake tract, as compared to the EVO. This has me somewhat worried as the EVO injectors will be shrouded by the bore in the head.

This picture shows the injectors without seals:



Does anyone see any downside to this?

 

[SHOCH]

"has me somewhat worried"

 

[sperold]

I think there is a lot of science in the placement of the fuel spray nozzle. Not knowing what that science is, means I don't know if that is a good idea or not. I tend to think "not". But I don't know if the spray comes straight out, or if it is angled down into the combustion chamber. The angled down scenario would be better.

 

[Shamwow]

Just wanted to follow up on this.

These injectors drop straight in. Bolt up. No boring the rails or anything. I do recommend new injector seals from shosource (for any injector upgrade)

I used evo 550cc but you could also use dsm 450cc or any aftermarket dsm injector.

The are low impedence, so i just wired in an accord v6 resistor box from the junkyard. Very simple.

Tuning went well, no issues controlling AFR and it seems to run well. the car made 340whp/340wtq at 6psi boost with stock fuel pressure

 

[Off Road SHO]

Our injectors do not spray into the cylinder as in Direct Injection engines. Ours spray into intake tract.

Tom

 

[Toolman]

Any more info on your build Shamwow?

 

[Shamwow]

Any more info on your build Shamwow?

Sure, what would you like to know?

The car is the MetSHO which has a small thread here (out of date). I run it with a bunch of buddies in 24hrs of Lemons, and our team is "Charnal House Racing". I keep the build thread over at ziptied.com updated http://www.ziptied.com/forum/index.php?threads/24-ulcers-of-lemons-metsho-biturbo-ver-4-0.29727/

Its currently themed as the 1981 Porsche 935 K3 which was sponsored by Apple computer

its 30 pages long, so if you don't want to read all of it, here are the cliff notes on the current setup...

SHO drivetrain in the back of a 93 geo metro using SHO subframe and suspension

Engine stuff:
-stock used 3.2L with 3.0L cams. Seller said 120k miles but who knows.
-Normal 60k stuff like seals and rod bearings
-Machined out the 3.2L hydraulic tensioner and made it manually tensioned with a bolt.
-Cooling system "re-route". We have blocked off almost all ports of the SHO water neck/distribution thing and greatly simplified the cooling circuit. I recommend this for any SHO doing endurance racing. No warmup loop, deleted the tube in the valley, no TB or IAC loop, no oil cooler loop, etc.
-External oil cooler added
-Relocated alternator to PS bracket (and deleted PS and AC). This underdrives the alt.

Turbo/forced induction stuff
-Twin EFR 6258 race turbos, donated by ESM racing from their actual 24hr of Lemans car. We run 4psi on the gate, and we have a custom manual boost controller that allows us to run 6psi.
-Stock SHO iron manifolds feeding into 1.93" diameter stainless railing pulled from a swimming pool that was being demolished
-ebay "Jdm sport" intercooler. Piping is all junkyard cludged stuff.
-05+ Ford slot style MAF, pulled from junkyard. We use the built in IAT from this MAF as well in place of the SHO IAT. Its in a 3" pipe which is actually a little too big for this setup. 2.5" would have been about perfect.
-300zx waste gate actuators
-550cc EVO injectors and honda accord v6 resistor box
-stock FPR and a Walbro 255. I know others have had fuel pressure issues with this setup but ours is rock steady. We feed/return the rail with -8AN hose so i think this helps.
-EEPROM chip tune via quarterhorse and Adam (Pops racing) strategy files. Dyno Tuned by Force engineering in plainwell, MI.
- We run about 23deg of timing at peak. It looks conservative on the spark plug. No o2 sensor or knock sensor feedback. AFR is about 11.2-11.3 at peak torque and tapers back to 11.5-11.8 at redline.
-The only other tricks in the tune, we pull timing and add fuel based on IAT and cooling temperature.

Drivetrain stuff:
-South Bench Clutch. (these guys are the absolute best)
-We machined the flyhweel down by cutting the mass ring off in the lathe. Its about 18lbs now.
-TRE transmission. This shop is big in the EVO/DSM world. They built our trans. Lots of special tricks including shot peening and gear detailing.
-redline D4 ATF as well as a trans cooler/pump rig.
-Axles repacked with Schaeffers synthetic grease


If you scan the ZT thread linked above you can see pics of most of that stuff. You can also follow us on facebook at www.facebook.com/CharnalHouse

We did have a headgasket blow at our last race, but I believe this happen earlier in the season due to a water leak. We ran out of coolant and everything got pretty hot...