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rickt84

10+ Year Contributor
30
0
Oct 18, 2009
brighton, Colorado
Hello all, I just purchased a 91 GSX, with a few mods, some ok, some crap. 16g turbo and huge front mount intercooler, but installed a 2g MAF w/o a wideband kit, or any kind of controller for that matter. Took it to a DSM specialist and told me to revert back to a 1g MAF to avoid damage from running too lean.

In the mean time , I am getting fuel cut out when I boost over 10 psi. I started to tweak the sdjuster screw on the 2g MAF, and the fuel cut out would happen @ a higher psi, and would be faster than before. I reverted to a 1g and the fuel cut out is the same as before I tweaked the 2g.

2 questions:

1. If I back the adjuster screw on the 2g MAF, to richen the ratio all the way, am I going to do damage to the motor (running to lean/rich) bc of not having a controller of some sort?

2. Will fuel cut out damage the motor at all?
 
Do a boost leak test you can use the search button to find more information about that than I could put here if I typed for an hour.

Basically you need to find all of the vacuum/boost leaks in your car and then it will probably be happy. Keep the 1g MAF, you aren't in a position to know what is really going on in your motor yet so stick with what came with the car.

Once you are done with you boost leak test you should have more power, better fuel efficiency, and a car that just runs better in general.
 
Agreed, do a boost leak test. 90% of fuel cut issues are from a boost leak. Turbo has to over work to get the same 10psi but since the turbo is working so hard the maf reads way more than the normal 10psi and gets over run.

Also dont run a 2g maf without injector compensation or at least 550's to equal out a little better. You will run about 20% lean running the 2g maf on a stock 1g ecu and injectors.
 
At least get somthing that will tell you what is going on in the engine. a couple hundred bucks to save a motor is pretty good. at least get a wideband.
 
+1 on a boost leak test. Very cheap to make a tool to do this test and this is probably your problem for overrunning even a 2G maf. You also need to verify which size injectors you have in there. Some people run 2G maf on 1G cars by putting larger injectors to compensate for the reading difference between the 2 maf's. You switched back to 1G maf but maybe you have 550's injector where you need 440's.
 
I do have 550 cc pink top evo injectors, and all my vaccuum lines are capped or ran accordingly. I will do a leak test, just need to do some research on it, thank you guys and I will get back at you in a little while. Anyone can hit me up @ [email protected], gtalk or email
 
i agree too boost leak test. run your 1g maf setup. shouldn't be getting any fuel cut with stock setup at 10psi find the leaks
 
Also get rid of your evo injectors until you have a way to tune for them. The previous owner may have been using the 2g maf to compensate for them but that method is rudimentary and unreliable. Pick up a used set of injectors for your car, they should be around $40.
 
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