What's a good aftermarket boost solenoid to buy? I saw the 3 port grim speed ones look decent but is there any others that are just as good a alil cheaper? Also can I install this aftermarket solenoid and drive around until I get it tuned next month? Thanks for the info

 

You can try a gm solenoid or tactrix. Perrin might also make a 3 port. I would not drive with it installed without changing the WDDC tables. To do that you'll need a tactrix cable, laptop, and ecuflash/evoscan.

 

Grimmspeed > everything else. Get a tune right away once installed or install day of tune.

 

Get a gm 3 port. Don't install it until you're ready to get tuned. You may over boost.

 

Ok... thanks for the info. I guess it's either grimmspeed or the gm 3 port it is.

 

Mr Fred has done extremely extensive bench testing of all the boost solenoids out there and the gm is by the far most responsive and he recommends the gm one for sure. Also, the resistor you read about people soldering into the wire is NOT necessary and only slows down the solenoids response time. I'd go gm all the way(and I personally did lol). It's a no brainer all the way, cheaper and better responding.

 

Ok thanks... does the gm 3 port require any extra rewiring or is it plug and play like the grimmspeed and others?

 

You can wire it in per instructions on the forum or get a harness from Spoolin Up and the GM 3 port like I did.

 

I think you should consult your tuner as well on this decision. The two 3 ports are both high quality but they are not tuned the same exact way so if your tuner is an expert with one and hasn't had too much experience with the other I would just use the one he is best at than risk him messing something up and loosing performance or the off chance that he is off so bad it ruins something.

 

I use an Ingersoll Rand solenoid. Same as the Perrin solenoid, but about 1/3 the price. No experience with any other solenoid, but have not had a single issue on mine in 2 years.

https://www.evolutionm.net/forums/ec...rks-cheap.html

 

Jason, if a tuner can tune one solenoid he can tune the other. The only real difference is the resistance the solenoid introduces into the circuit. So the wastegate target duty cycle charts need to change in reference to the amount of resistance the solenoid is giving the circuit. I understand your thinking of getting which one your personal tuner prefers, but I would get the one that you prefer and if the tuner can't tune one vs the other its time for a new tuner.

 

So I'm going to get the gm 3 port boost solenoid. Does it matter if I get the harness w/o the resistor or with it?

 

You don't need the resistor and in fact it slows down the solenoid's response time. Also, if you know how to solder you don't need the plug n play harness either. Some people get all weird about cutting factory wires though. I went to a local junk yard and got the plug for the solenoid off of an old gm van's washer bottle. Any gm out there has the exact same plug on the washer bottle and its the same plug as the boost solenoid. Then I just cut the factory wires and soldereded in the new harness and put heat shrink tubing over the soldered connections. Super easy.

 

Wow that does sound pretty easy and I work in a garage so I see a lot of gm's. Might have to try that thanks.