The previous owner of my Megasquirtpnp2 had these running in his turbo miata - makes you wonder how many people have bad injectors in their cars.... I'm getting ready to supercharge the Exocet, so I was getting some known good injectors ready. I used RC Injectors, the turn around was quick - I think they're a GRM sponsor as well? Great service either way!
What could you have done with a 9v battery a can of spray cleaner and some compressed air?
I'm collecting parts for a flow bench using a MS system.
In reply to bentwrench :
Fo sho! I went with the pros - I have enough projects without making another ;)
Interesting. How long did they sit since they last ran?
If they sat for a long time, I wonder how much/how quickly they'd start flowing as they should after some use.
bentwrench said:What could you have done with a 9v battery a can of spray cleaner and some compressed air?
I'm collecting parts for a flow bench using a MS system.
This one of those calculations where the cost of doing it right is very low compared to the cost of a failure caused by not doing it right. A 9v battery and some spray cleaner might have worked - but is it worth the risk of losing an engine due to a lean cylinder? If you're not monitoring individual AFRs or EGTs, you wouldn't know you had a problem. You can rig up a test bench to check flow and you can eyeball the pattern, or you can just get the pros to do it for a pretty reasonable price.
What does such work cost and how does it factor into the challenge budget?
Pete
NOHOME said:What does such work cost and how does it factor into the challenge budget?
Pete
Because it was farmed out, The Challenge cost is the same as the actual cost.
A BMW pro tech I was speaking with said that he's seen essentially new motors with a +/-50% spread in injector flow rates, which seems astonishing, but I trust him and he's seen a lot more than I have. When I can make time to take my daily off the road for a week I'm planning to pull the injectors and send them off.
Kinsler makes a 2-stage filter, with 10 micron primary and 3 micron secondary filtration.
Check out Injector Pulse for reasonable injector cleaning prices. The owner is a Spec Miata racer and the top cars on the East Coast use his service. $20/ea isn't bad, there are several in my autocross club who've used him then picked up several HP since it could be more accurately retuned.
In reply to flatlander937 :
Thanks for the price reference. In my mind with zero frame of reference, I was imagining over $200 for the service.
what was the price?
bentwrench said:What could you have done with a 9v battery a can of spray cleaner and some compressed air?
I'm collecting parts for a flow bench using a MS system.
I have a test setup with a small fuel tank (one of those ~2 gal drag race fuel cell thingy), a regulator/filter, a Bosch fuel pump, and a pigtail to connect to any injector w/ an EV1 connector. I hook a car battery up to it and have a momentary switch inline w/ the injector wiring, so I push the button and the injector sprays (hopefully). I can easily assess if an injector is working / dripping / plugged. I haven't tried to actually measure fuel flow, but I suppose a beaker, a stopwatch, and some maths would get me there. I usually shoot mineral spirits through them to clean 'em and so I'm not spraying gasoline everywhere.
The whole process that Injector Pulse does is documented on their website. Xavier is a stand up guy... Let him know that Tony from TSCC referred you 
I took mine to a decent local diesel shop. They had all the equipment to flow test the injectors, and didn’t charge the race car premium.
$7 each.
I think it was 30 an injector including shipping, they flow test AND rebuild the injectors (looks like they had to replace all the soft parts on all 4 of mine...). I'm very satisfied and the process was hassle free. Very glad I did, now to get my supercharger ordered....
Injector #2 was really working for a living.
nice, I need to replace the o-rings on the disco, might as well send out the injectors for a good cleaning and balancing while there. Certainly cheaper than buying new
https://grassrootsmotorsports.com/articles/blueprinting-aging-fuel-injectors-can-extend-life-/
Here's the GRM article on the matter.
I had similarly good results getting injectors cleaned at Marren Injection here in CT. for $25ea.
The results show increased injector flow (~4%), eliminated flow variance for each injector (between trials), and greatly reduced the flow variance among the set of injectors (was 6%; is 2%).
I'd like to know how often this cleaning should be done ... every year? every 25K miles? Any ideas?
-- Pete
I suspect the length of time sitting is as much of a factor as mileage. Probably more.
You'll need to log in to post.
