home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications

Reply
 
Thread Tools Display Modes
Old 09-26-2013, 04:22 PM   #1
Glocksrox18
Board Member
 
Join Date: Jun 2013
Location: Roxbury, NJ
Default 18T on KJET too much?

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
Glocksrox18 is offline   Reply With Quote
Old 09-26-2013, 04:30 PM   #2
740atl
educator monkey
 
740atl's Avatar
 
Join Date: Apr 2010
Location: USA
Default

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.
740atl is offline   Reply With Quote
Old 09-26-2013, 04:33 PM   #3
Glocksrox18
Board Member
 
Join Date: Jun 2013
Location: Roxbury, NJ
Default

Quote:
Originally Posted by 740atl View Post
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..
Glocksrox18 is offline   Reply With Quote
Old 09-26-2013, 04:47 PM   #4
vvpete
Board Member
 
Join Date: Feb 2005
Location: Land of Enchantment
Default

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.
vvpete is offline   Reply With Quote
Old 09-27-2013, 12:28 AM   #5
Glocksrox18
Board Member
 
Join Date: Jun 2013
Location: Roxbury, NJ
Default

Quote:
Originally Posted by vvpete View Post
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?
Glocksrox18 is offline   Reply With Quote
Old 09-27-2013, 06:16 AM   #6
Mogly
Board Member
 
Mogly's Avatar
 
Join Date: Mar 2013
Location: Tucson, AZ
Default

I wouldnt up the boost just yet.
Mogly is offline   Reply With Quote
Old 09-27-2013, 02:37 PM   #7
Glocksrox18
Board Member
 
Join Date: Jun 2013
Location: Roxbury, NJ
Default

Quote:
Originally Posted by Mogly View Post
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
Glocksrox18 is offline   Reply With Quote
Old 09-27-2013, 03:27 PM   #8
Mueller
Board Member
 
Mueller's Avatar
 
Join Date: Oct 2004
Location: Antioch, CA
Default

Quote:
Originally Posted by Glocksrox18 View Post
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?)
__________________
.........
Mueller is offline   Reply With Quote
Old 09-27-2013, 04:46 PM   #9
Glocksrox18
Board Member
 
Join Date: Jun 2013
Location: Roxbury, NJ
Default

Quote:
Originally Posted by Mueller View Post
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
Glocksrox18 is offline   Reply With Quote
Old 09-27-2013, 10:55 PM   #10
olov
doing something stupid
 
Join Date: Aug 2003
Location: warrenton, nc 27589
Default

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
__________________
Quote:
opinions are like ***holes, i have one, and they're censored on tb
olov is offline   Reply With Quote
Old 09-27-2013, 11:29 PM   #11
dl242gt
Happy playing the blues
 
dl242gt's Avatar
 
Join Date: Jun 2002
Location: S NJ, a suburb of Phila.
Default

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.
__________________
Dave,
1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration.

1993 245 Classic, 430k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
dl242gt is offline   Reply With Quote
Old 09-27-2013, 11:55 PM   #12
Glocksrox18
Board Member
 
Join Date: Jun 2013
Location: Roxbury, NJ
Default

So how much boost can the stock b21ft hold? Assuming good AFRs and intercooled
Glocksrox18 is offline   Reply With Quote
Old 09-28-2013, 12:42 AM   #13
Slobodan
Board Member
 
Slobodan's Avatar
 
Join Date: Mar 2004
Location: Northwest part of Oregon
Default

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.
__________________
'85 744 GLE: D24TIC ZF 22. Current DD.
'79 245 DL: D24TIC M47 40mpg:
'79 242 GT: B21FT K-Jet 24.4mpg
'72 164 : B30 M410 Needs front end work.
'83 265 GL : D24 M46 - Must complete the maintenance
.
Slobodan is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 05:24 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.