18T on KJET too much?

[Glocksrox18]

looking to pick up a rebuilt 18T with an 11 blade billet compressor wheel installed and balanced. ill be running a 90+ manifold with custom oil and coolant lines. my question is will this turbo be too much for KJET to handle? would it allow for proper AFRs? I plan to run 10-12 psi. im currently running 13 psi on the stock garrett turbo

[740atl]

Should be ok. It's not that much bigger than the t3.

Get yourself a wideband to monitor your afr's and you'll know for sure.

[Glocksrox18]

Originally Posted by 740atl

Should be ok. It's not that much bigger than the t3.

Get yourself a wideband to monitor your afr's and you'll know for sure.

I plan on getting an aem uego wideband when I get the money. I have one installed on my s60r and love it... but its not the most inexpensive gauge out there..

[vvpete]

If you haven't already done so, look into the fuel distributor FPR shimming to increase the system pressures and modification of the WUR control pressures. If you find you are running lean under boost uping the system pressure and lowering the control pressure will enrichen the mixture. You may also want to overide the pressure switch that limits boost.

[Glocksrox18]

Originally Posted by vvpete

If you haven't already done so, look into the fuel distributor FPR shimming to increase the system pressures and modification of the WUR control pressures. If you find you are running lean under boost uping the system pressure and lowering the control pressure will enrichen the mixture. You may also want to overide the pressure switch that limits boost.

How do you override the switch?

[Mogly]

I wouldnt up the boost just yet.

[Glocksrox18]

Originally Posted by Mogly

I wouldnt up the boost just yet.

im running 12-13 now. with the 18t id like to run 11-12 if I can match the fuel with that much air coming in

[Mueller]

Originally Posted by Glocksrox18

im running 12-13 now. with the 18t id like to run 11-12 if I can match the fuel with that much air coming in

Last time I checked, 12-13 > 11-12 , so where is the extra air coming from?

(possible more dense due to air not being as hot, but will it make that much difference at that level?)

[Glocksrox18]

Originally Posted by Mueller

Last time I checked, 12-13 > 11-12 , so where is the extra air coming from?

(possible more dense due to air not being as hot, but will it make that much difference at that level?)

a turbo with a larger compressor will flow more air than a turbo with a smaller compressor at the same psi. the reason I would be running a pound or two less with the larger turbo is because I do not feel safe running 13psi on a stock motor. unless these motors can handle more boost without detonation

[olov]

i vote you'll be fine

i ran a .63/.60 t3 and it was just about perfect for kjet. get a wideband and up the boost till it starts to lean out imo. kjet ran pretty rich in boost if i remember correctly, and the spark is super conservative, you'll be fine

[dl242gt]

You can add a bunch of fuel using the kjet lambda. You can get a ton of fuel added with the terminal 11 mod. Also I second getting a wideband. You don't have to get a real expensive one like the AEM. Just get one that will do the job and you can see it's display easily while driving so you can keep a good eye on things. You want to add the terminal 11 fuel right at the spot things get lean. Look for posts on kjet enrichment and by rayj777 for a lot of good info especially about raising the system pressure like Pete suggested.

[Glocksrox18]

So how much boost can the stock b21ft hold? Assuming good AFRs and intercooled

[Slobodan]

I had 25psi cramming down my B21FT's throat but not on K-Jet. LH 2.2 + EZK + T5 injectors Stock T cam so any extra boost above 15psi is just useless. And on E85. Turbo at that time Garrett T3 .60/.63
However I didn't hear any detonation and this motor still is in service. I used new head bolts and Elring head gasket when I put this motor together.